Patent Publication Number: US-2010128585-A1

Title: Information reproducing apparatus and method, and computer program

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an information reproducing apparatus and method, which reproduces sound information and video information recorded on an information recording medium. The present invention further relates to a computer program used in such an information reproducing apparatus. 
     2. Description of the Related Art 
     Recently, a recording medium such as CD and DVD which is able to record and reproduce data by using digital signal become common. According to this, an information reproducing apparatus operating specific reproducing process arises from a digital signal has been developed. For example, in case of CDs and DVDs, a series of a video scene and a piece of music (it means contents data) is recorded thereon relating to each other. For example, in case of a movie, each video scenes with predetermined reproduction time is recorded as a plurality of data group, in order to be able to be reproduced according to a series of a reproduction sequence specified by PGC (Program Group Chain) and a playlist. For example, in case of music, each piece of music with predetermined reproduction time is recorded as a plurality of data group classified according to its track number. Because of this, the information reproducing apparatus can carry out a cue reproduction which reproduces each of video scenes and music by searching a heading address of them, a random reproduction which reproduces each of video scenes and music while changing their reproduction order arbitrarily and the like. 
     Moreover, an information reproducing apparatus which possesses a jog dial such as DJ (Disc Jockey) equipment can carry out a particular kind of reproduction such as a reverse reproduction, a scratch reproduction and the like. The reverse reproduction is a reproduction method which is opposite from forward reproduction which is usually carried out. In the reverse reproduction, contents data, which should be reproduced in the forward direction as time goes on, are reproduced in the backward direction. This is achieved by rotating the jog dial in reverse direction (it means rotating in a counter-clockwise direction). Moreover, in the scratch reproduction, by shuttling the jog dial in a clockwise direction and in a counter clockwise direction, the reproduction of the contents data in the forward direction and the reverse direction is carried out by turns. As a result, a sound effect such as a scratch sound, which is different from a sound which is usually output, is output (see patent document 1). 
     Moreover, a composition (so-called an effector) which edits and processes the contents data reproduced as described above by adding effect processing is disclosed in patent document 2. 
     Patent document 1: Japanese Patent Application Laid Open NO. 2002-34026 
     Patent document 2: Japanese Patent Application Laid Open NO. 2000-47665 
     SUMMARY OF THE INVENTION 
     However, because a proficient skill is required in order to perform so-called the scratch reproduction, it cannot be performed easily. Moreover, because the scratch reproduction or the like is performed by manual operation of jog dial with hands of a user, such a limit that the shuttling operation of at most several. Hz can be performed exists even if the user has the proficient skill. However, there lies such a problem that there is not always satisfaction in existing equipment, because more advanced reproduction technique might be desired depending on preference of an audience. 
     Problems the present invention tries to solve include a problem described above as an example. It is therefore an object of the present invention to provide an information reproducing apparatus and method allowing more advanced reproduction technique to be performed easily, and a computer program which allows a computer to function as such an information reproducing apparatus. 
     The above objects can be achieved by an information reproducing apparatus of the present invention provided with: a reading device for reading contents data; an operating device constructed to rotate depending on an operation of a user; a detecting device for detecting rotating operation performed on the operating device as operating signal; a generating device for generating modulation signal by adding a predetermined additional signal vibrating at a fixed frequency or a variable frequency to the operating signal; a reproducing device for reproducing the contents data, while determining reproduction speed and reproduction direction of the contents data on the basis of the modulation signal. 
     The above objects can be also achieved by an information reproducing method of the present invention of an information reproducing apparatus provided with an operating device constructed to rotate depending on an operation of a user, the information reproducing method provided with: a reading process of reading contents data; a detecting process for detecting rotating operation performed on the operating device as operating signal; a generating process for generating modulation signal by adding a predetermined additional signal vibrating at a fixed frequency or a variable frequency to the operating signal; a reproducing process for reproducing the contents data, while determining reproduction speed and reproduction direction of the contents data on the basis of the modulation signal. 
     The above objects can be also achieved by a computer program of the present invention for controlling the reproduction to control a computer provided in an information reproducing apparatus provided with a reading device for reading contents data; an operating device constructed to rotate depending on an operation of a user; a detecting device for detecting rotating operation performed on the operating device as operating signal; a generating device for generating modulation signal by adding a predetermined additional signal vibrating at a fixed frequency or a variable frequency to the operating signal; a reproducing device for reproducing the contents data, while determining reproduction speed and reproduction direction of the contents data on the basis of the modulation signal, the computer program making the computer function at least as one portion of the reading device, the detecting device, the generating device and the reproducing device. 
     A function and other benefit of the present invention will be made clear by the embodiment described below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram schematically showing the basic structure of an optical disc reproducing apparatus of the example of the present invention. 
         FIG. 2  is a block diagram schematically showing the structure especially of a signal processor of the optical disc reproducing apparatus of the example of the present invention. 
         FIG. 3  is a flowchart schematically showing a flow of the operation of the optical disc reproducing apparatus of the example of the present invention. 
         FIG. 4  is a wave profile specifically showing an example of an additional signal. 
         FIG. 5  is a wave profile specifically showing other example of the additional signal. 
         FIG. 6  is a wave profile specifically showing other example of the additional signal. 
         FIG. 7  is a wave profile specifically showing other example of the additional signal. 
         FIG. 8  is a wave profile schematically showing the actual change of each of an operating signal, an additional signal and a modulation signal which is a sum of the operating signal and the additional signal on the time axis of the reproduction. 
         FIG. 9  is a block diagram schematically showing the basic structure of the optical disc reproducing apparatus of the alternative example of the present invention. 
         FIG. 10  is a wave profile schematically showing changes of parameters which determine the additional signal. 
         FIG. 11  is a block diagram schematically showing the basic structure of the optical disc reproducing apparatus of the other example of the present invention. 
     
    
    
     DESCRIPTION OF THE REFERENCE SIGNS 
     
         
           1  optical disc reproducing apparatus 
           10  optical pickup 
           11  RF amplifier 
           15  signal processor 
           20  system controller 
           22   22  scratch emulation processor 
           40  operation unit 
           41  jog dial 
           42  encoder 
           43  touch sensor 
           44  scratch emulation mode-in button 
       
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, an embodiment of the information reproducing apparatus, the information reproducing method and the computer program of the present invention will be explained as the best mode for carrying out the invention. 
     Embodiments of Information Reproducing Apparatus  
     An embodiment of the information reproducing apparatus of the present invention is provided with: a reading device for reading contents data; an operating device constructed to rotate depending on an operation of a user; a detecting device for detecting rotating operation performed on the operating device as operating signal; a generating device for generating modulation signal by adding a predetermined additional signal vibrating at a fixed frequency or a variable frequency to the operating signal; a reproducing device for reproducing the contents data, while determining reproduction speed and reproduction direction of the contents data on the basis of the modulation signal. 
     According to the embodiment of the information reproducing apparatus of the present invention, contents data including video and sound recorded on a recording medium such as CD and DVD is read by the operation of the reading device. Then, the user can operate the operating device, for example, in order to perform special reproduction process to the contents data. The operating device is constructed to rotate depending on the operation of the user. A specific example of the operating device is a jog dial used for DJ equipment. A term “DJ” relating to the present invention means the one which reproduces the contents data in a broad sense including not only music but also video, by using special technique. 
     The content of operation performed on the operating device (especially, rotating operation) is detected as an operating signal by the detecting device. Then, by the operation of the generating device, the adding signal vibrating at the fixed frequency or the variable frequency is added to the operating signal. As a result, the modulation signal is generated. Moreover, by the operation of the reproducing device, the contents data is reproduced on the basis of the modulation signal. 
     As described above, in this embodiment, in addition to or instead of the production of the contents data merely based on the operation performed on the operating device by the user (it means the operating signal), the reproduction of the contents data based on the modulation signal corresponding to the operating signal with the additional signal added. Especially, in this embodiment, because the prescribed additional signal vibrating at the fixed frequency or the variable frequency is added to the operating signal, the reproduction of the contents data which can be performed by shuttling the operating device to a clockwise direction and to a counter clockwise direction at relatively high-speed (in other word, a continuous slight movement scratch, where the reproduction speed and the reproduction direction is changing continuously, such as a scribble, a bubble scratch or the like) is achieved. Moreover, the continuous slight movement scratch which had to be performed only by the operation of the user performed on the operating device (what is called the manual operation), can be achieved relatively easily by adding the additional signal. That is, the burden of the operation necessary to perform the continuous slight movement scratch on the user can be reduced. Furthermore, it is possible to receive the effects that the continuous slight movement scratch can be stably performed every time in the same mode as far as the same additional signal is added. 
     Furthermore, according to the mode of the additional signal, the continuous slight movement scratch can be achieved in the mode which is difficult or impossible to be achieved by the operation of the user performed on the operating device. Especially, the continuous slight movement scratch can be achieved in the mode which has not been achieved before, by making the additional signal to be a signal which allows the continuous slight movement scratch to be achieved in the more special, more advanced or more complex mode. By this, a more advanced reproduction technique can be achieved relatively easily compared with the information reproducing apparatus where the additional signal is not added to the operating signal. 
     Incidentally, the effector which processes filtering on the output or the like of the information reproducing apparatus cannot obtain the contents data following the contents data reproduced presently (that is, futural), in real time. By this, the reproduction speed of the contents data cannot be made faster than the reproduction speed of the information reproducing apparatus. Therefore, the effect similar to the scratch including operation which makes the reproduction speed faster cannot be added in real time. On the contrary, according to the embodiment of the information reproducing apparatus, the contents data following the contents data reproduced presently (that is, futural), can be obtained in real time, As a result, the reproduction speed of contents data can be made faster and slower. Therefore, the continuous slight movement scratch including the operation which makes the reproduction speed faster or slower can be performed in real time. By virtue of this, it can be said that the information reproducing apparatus relating to this embodiment has an effect that is more excellent than an existing equipment. 
     In one aspect of the embodiment of the information reproducing apparatus of the present invention, it is provided with: a configuring device for configuring whether or not to add the additional signal to the operating signal; and wherein the generating device adds the additional signal to the operating signal, if the configuring device configures to add the additional signal to the operating signal. 
     According to this aspect, depending on the result of configuration of the configuring device, whether or not to add the additional signal to the operating signal is determined. The configuring device may configure whether or not to add the additional signal to the operating signal, based on the operation of the user performed on the prescribed operation button. By this, for example the additional signal can be added to the operating signal selectively only if the user wants. Therefore, the reproduction of the contents data based on the operating signal (in other words, the reproduction of the contents data in the usual mode) and the reproduction of the contents data based on the modulation signal (in other words, the reproduction of the contents data by a more advanced mode, specifically the continuous slight; movement scratch) can be suitably combined. As a result, the contents data can be reproduced in more various modes. 
     In another aspect of the embodiment of the information reproducing apparatus of the present invention, the adding device adds the additional signal to the operating signal while the operating device is operated by the user. 
     In this aspect, the additional signal is added to the operating signal while the operating device is operated. On the other side, the additional signal is not added to the operating signal while the operating device is not operated. In other words, it is determined whether or not to add the additional signal to the operating signal according to whether or not the user is operating the operating device. Therefore, the user need not perform an independent operation for starting or stopping the addition of the additional signal described above. As a result it is possible to improve the operability of the user. 
     In another aspect of the embodiment of the information reproducing apparatus of the present invention, it is provided with: a frequency changing device for changing frequency of the additional signal. 
     According to this aspect, because the frequency of the additional signal can be changed arbitrarily, the contents data can be reproduced in more various modes. In other words, the mode of the reproduction of the continuous slight movement scratch can be changed relatively easily. 
     In an aspect of the embodiment of the information reproducing provided with a frequency changing device, the frequency changing device changes the frequency of the additional signal in response to at least one of an operation speed and an operation amount which relate to the rotating operation of the operating device. 
     By virtue of such construction, the frequency of the additional signal can be changed in more various modes. Therefore, the continuous slight movement scratch can be performed in more various modes. 
     In an aspect of the embodiment of the information reproducing provided with a frequency changing device, the frequency changing device changes the frequency of the additional signal in response to an operation of the operating device other than rotating operation. 
     By virtue of such construction, the frequency of the additional signal can be changed by using the operating device, in addition to reproduction of the contents data. In other words, two different kinds of operations can be performed by operating the operating device. 
     In another aspect of the embodiment of the information reproducing apparatus of the present invention, it is provided with: an amplitude changing device for changing amplitude of the additional signal. 
     According to this aspect, because the amplitude of the additional signal can be changed arbitrarily, the contents data can be reproduced in more various modes. In other words, the mode of the reproduction of the continuous slight movement scratch can be changed relatively easily. 
     In an aspect of the embodiment of the information reproducing provided with an amplitude changing device, the amplitude changing device changes the amplitude of the additional signal in response to at least one of an operation speed and an operation amount which relate to the rotating operation of the operating device. 
     By virtue of such construction, the amplitude can be changed in more various modes. Therefore, the contents data can be produced in more various modes. 
     In an aspect of the embodiment of the information reproducing provided with an amplitude changing device, the amplitude changing device changes the amplitude of the additional signal in response to an operation of the operating device other than rotating operation. 
     By virtue of such construction, the amplitude of the additional signal can be changed by using the operating device, in addition to reproduction of the contents data. In other words, two different kinds of operations can be performed by operating the operating device. 
     In another aspect of the embodiment of the information reproducing apparatus of the present invention, the operating signal is a signal which represents an operation amount relating to rotating operation of the operating device, and assuming that the operating signal is da and the additional signal is db, the reproduction speed of the contents data is determined to be proportional to da+db. In this case, the direction where contents data is reproduced may be determined by the sign of da+db. 
     By virtue of such construction, the reproduction speed and the reproduction method of the contents data can be changed according to the value of da+db in a more advanced mode. Therefore, the user can perform the continuous slight movement scratch while reducing the burden of the operation of the user as described above. 
     In another aspect of the embodiment of the information reproducing apparatus of the present invention, the additional signal contains at least one of triangle wave signal, sawtooth wave signal, square wave signal and sine wave signal. 
     According to this aspect, it is possible to the continuous slight movement scratch can be performed in more various modes, using such addition signal. 
     Embodiment of Information Reproducing Method 
     An embodiment of the information reproducing method of the present invention is an information reproducing method of an information reproducing apparatus provided with: an operating device constructed to rotate depending on an operation of a user, the information reproducing method provided with: a reading process of reading contents data; a detecting process for detecting rotating operation performed on the operating device as operating signal; a generating process for generating modulation signal by adding a predetermined additional signal vibrating at a fixed frequency or a variable frequency to the operating signal; a reproducing process for reproducing the contents data, while determining reproduction speed and reproduction direction of the contents data on the basis of the modulation signal. 
     According to the embodiment of the information reproducing method of the present invention, it is possible to receive the same effects as those of the information reproducing apparatus of the present invention described above. 
     Incidentally, in response to the various aspects of the embodiment of the information reproducing apparatus of the present invention described above, the embodiment of the information reproducing method of the present invention can adopt various aspects. 
     Embodiment of Computer Program  
     An embodiment of the computer program of the present invention is a computer program for controlling the reproduction to control a computer provided in the information reproducing apparatus provided with a reading device for reading contents data; an operating device constructed to rotate depending on an operation of a user; a detecting device for detecting rotating operation performed on the operating device as operating signal; a generating device for generating modulation signal by adding a predetermined additional signal vibrating at a fixed frequency or a variable frequency to the operating signal; a reproducing device for reproducing the contents data, while determining reproduction speed and reproduction direction of the contents data on the basis of the modulation signal (briefly the embodiment of the information reproducing apparatus of the present invention described above (however including its various aspects)), the computer program making the computer function at least as one portion of the reading device, the detecting device, the generating device and the reproducing device. 
     According to the embodiment of the computer program of the present invention, each embodiment of the aforementioned information reproducing apparatus of the present invention can be embodied relatively readily, by loading the computer program from a recording medium for storing the computer program, such as a ROM, a CD-ROM, a DVD-ROM, a hard disc or the like which stores aforementioned computer program, into computer, or by downloading the computer program into the computer via a communication device. 
     Incidentally, in response to the various aspects of the embodiment of the information reproducing apparatus of the present invention described above, the embodiment of the computer program of the present invention can adopt various aspects. 
     An embodiment of the computer program product of the present invention is a computer program product for tangibly embodying a program of instructions executable by a computer provided in an information reproducing apparatus comprising a reading device for reading contents data; an operating device constructed to rotate depending on an operation of a user; a detecting device for detecting rotating operation performed on the operating device as operating signal; a generating device for generating modulation signal by adding a predetermined additional signal vibrating at a fixed frequency or a variable frequency to the operating signal; a reproducing device for reproducing the contents data, while determining reproduction speed and reproduction direction of the contents data on the basis of the modulation signal (briefly the embodiment of the information reproducing apparatus of the present invention described above (however including various aspects of it)), the computer program product making the computer function at least as one portion of the reading device, the detecting device, the generating device and the reproducing device. 
     According to the embodiment of the computer program product of the present invention, each embodiment of the aforementioned information reproducing apparatus of the present invention can be embodied relatively readily, by loading the computer program product from a recording medium for storing the computer program product, such as a ROM (Read Only Memory), a CD-ROM (Compact Disc-Read Only Memory), a DVD-ROM (DVD Read Only Memory), a hard disc or the like, into the computer, or by downloading the computer program product, which may be a carrier wave, into the computer via a communication device. More specifically, the computer program product may include computer readable codes to cause the computer (or may comprise computer readable instructions for causing the computer) to function as each embodiment of the aforementioned information reproducing apparatus of the present invention. 
     Incidentally, in response to the various aspects of the embodiment of the information reproducing apparatus of the present invention described above, the embodiment of the computer program product of the present invention can adopt various aspects. 
     The nature, utility, and further features of this invention will be more clearly apparent from the following detailed description. 
     As explained above, according to the embodiment of the information reproducing apparatus and method of the present invention, it is provided with the reading device, operating device, detecting device, generating device and reproducing device or reading process detecting process, generating process and reproducing process. According to the embodiment of the computer program of the present invention it makes the computer function as the embodiment of the information reproducing apparatus of the present invention. Therefore, a more advanced reproduction technique can be achieved relatively easily. 
     Example  
     Hereinafter, example of the present invention will be explained with reference to the drawings. Incidentally, example described below is the example when the information reproducing apparatus of the present invention is applied to the optical disc reproducing apparatus that has various reproducing functions, for example, the reproduction speed control, the tempo control, and the rewinding reproduction, such as CD players, DVD players or the like. Moreover, the optical disc reproducing apparatus of this example described below is used as DJ equipment (including the VJ(Video Jockey) equipment) which is used when the music data or the video data is continuously reproduced by adding various special effects (effect), while changing the optical disc one after another, in the ballroom such as the club, the disco and the like. 
     (1) Basic Structure 
     Firstly, with reference to  FIG. 1  and  FIG. 2 , an explanation will be given on an optical disc reproducing apparatus of this example.  FIG. 1  is a block diagram schematically showing the basic structure of an optical disc reproducing apparatus  1  of this example.  FIG. 2  is a block diagram schematically showing the structure especially of a signal processor  15  of the optical disc reproducing apparatus of this example. 
     As shown in  FIG. 1 , an optical disc reproducing apparatus  1  of the example is provided with an optical pickup (PU)  10 ; a RF (Radio frequency) amplifier  11 ; a spindle motor  12 ; a servomechanism  13 ; a pickup servo circuit  14 ; a signal processor  15 ; a buffer memory  16 ; a cue-point memory  17 ; a spindle servo circuit  18 ; an editing device  19 ; a system controller  20 ; an external output terminal  30 ; operating unit  40 ; a jog dial  41 ; an encoder  42 ; a touch sensor  43 ; and a display  50 . 
     The optical pickup  10  composes one specific example of the reading device of the present invention and reads contents data containing movie and music, and control data which controls the reproduction of the contents data from the optical disc  100 . The optical pickup  10  is composed from a semiconductor laser device, various lenses, actuators and so on. More specifically, the optical pickup  10  irradiates a laser beam LB with a prescribed power to the optical disc  100 . Moreover, it is provided with the PD (Photo Detector) sensor of receiving optical for receiving reflected light of the laser beam LB, and outputs the received reflected light as a readout signal Sdt to the RF amplifier  11 . 
     The optical pickup  10  is constructed so that it can move in a radial direction of the optical disc  100  according to a tracking error signal TE, by the actuator, a slider and the like which is not illustrated and is driven by control of the servomechanism  13 . In addition, the optical pickup  10  is constructed so that it can change the focus of the laser beam LB according to a focus error signal FE, by control of the servomechanism  13 . 
     The RF amplifier  11  generates a RF signal DRF based on the readout signal Sdt which is output from the optical pickup  10 , and outputs the generated RF signal DRF to the signal processor  15 . Moreover, the RF amplifier  11  generates an error signal such as the focus error signal FE for controlling the focus of the laser beam LB when the optical pickup  10  irradiates the laser beam LB to the optical disc  100  and the tracking error signal TE for controlling the tracking of the laser beam LB when the optical pickup  10  irradiates the laser beam LB to the optical disc  100 , based on the readout signal Sdt. The generated error signals (FE and TE) are output to the pickup servo circuit  14 . 
     The spindle motor  12  is constructed so that it can rotate the optical disc  100  at a prescribed speed while receiving a spindle servo from the spindle servo circuit  18 . 
     The servomechanism  13  moves the optical pickup  10  in the radial direction of the optical disc  100  based on a tracking controlling signal output by the pickup servo circuit  14 . Moreover, the servomechanism  13  moves an object lens included in the optical pickup  10 , in a direction of a light axis of the laser beam LB based on a focus servo controlling signal output by the pickup servo circuit  14 . 
     The pickup servo circuit  14  generates the focus servo controlling signal and the tracking servo controlling signal which control the servomechanism  13 , based on the error signals (such as the focus error signal FE and the tracking error signal. TE) output from the RF amplifier  11 . The generated focus servo controlling signal and the generated tracking servo controlling signal are output to the servomechanism  13 . In other words, the pickup servo circuit  14  performs a feedback control on the servomechanism  13  in order to suppress the occurrence of the focus error and the tracking error, based on the error signals (such as the focus error signal FE and the tracking error signal TE) output from the RF amplifier  11 . 
     The signal processor  15  composes one specific example of the reproducing device of the present invention and is formed with the digital signal processor (DSP) which has the calculation function. The signal processor  15  generates demodulated data by decoding the RF signal DRF in accordance with the standard of the CD and the DVD. In addition, the signal processor  15  splits and extracts the contents data for the contents reproduction and control data CNT for seamless reproduction included in the demodulated data. Specific examples of the control data CNT are, for example, TOC data recorded in the lead-in area of the optical disc  100 ; synchronous data recorded to be included in the stream signal; and sub-code data including the information of the passage of time when the contents data is reproduced. The generated control data CNT is output to the system controller  20 , and used to control the reproduction of the contents data (especially, to decode the contents data to the contents data Dd which can be reproduced seamlessly). 
     With reference to  FIG. 2 , an explanation will be given on the more specific structure of the signal processor  15 . 
     As shown in  FIG. 2 , the signal processor  15  is provided with: a temporary storage  15   a ; a decoder  15   b  which performs the decode process described above; an address controller  15   c ; read I write controller  15   e ; and a data expander  15   e . Moreover, the buffer memory  16  and the cue-point memory  17  are connected with the signal processor  15 . 
     The temporary storage  15   a  temporarily stores the RF signal DRF output from the RF amplifier  11  and is installed as a work area where the decoder  15 h decodes the RF signal DRF to thereby generate the contents data Dd for the seamless reproduction. The buffer memory  16  is formed with the ring memory which has a prescribed memory capacity. The buffer memory  16  stores the contents data Dd decoded by the decoder  15   b  and outputs the contents data Dd once stored as contents data Dmb, according to the control of the address controller  15   c  and the read/write controller  15   d . Mainly, the buffer memory  16  stores the contents data Dd which should be reproduced during the forward reproduction, the reverse reproduction and the reciprocal reproduction (in other words, the scratch reproduction), and outputs as the contents data Dmb. 
     The cue-point memory  17  is formed with the semiconductor memory that has a prescribed memory capacity. The cue-point memory  17  stores the contents data Dd decoded by the decoder  15   b  and outputs the contents data Dd once stored as contents data Dcue, according to the control of the address controller  15   c  and the read/write controller  15   d.    
     However, unlike the buffer memory  16 , the cue-point memory  17  is constructed so that it stores a prescribed amount of the contents data Dd which is in front or in the rear of the cue-point for the cue reproduction, and outputs the stored contents data Dd as the contents data Dcue relating to the cue-point when the user specifies the cue reproduction. 
     The decoder  15   b  supplies the contents data Dd to the buffer memory  16  or the cue-point memory  17  and makes them store the content data Dd according to the instruction from the system controller  20 , when the contents data Dd is generated as described above. In other words, during the forward reproduction, the reverse reproduction and the scratch reproduction, the decoder  15   b  makes the contents data Dd, which is obtained by reading the information from the optical disc  100  by the optical pickup  10 , be stored on the buffer memory  16 . Moreover, when the cue-point is configured by the user, the decoder  15   b  makes the contents data Dd, which is obtained by reading the information which is in front or in the rear of the cue-point by the optical pickup  10 , be stored on the cue-point memory  17 , the contents data Dd. 
     The address controller  15   c  generates address data Ba which specifies an address of the buffer memory  16  and address data Ca which specifies an address of the cue-point memory  17  according to the instruction from the system controller  20 . 
     The read/write controller  15   d  controls the writing and the reading of the data in the buffer memory  16  and the writing and the reading of the data in the cue-point memory  17  by supplying read-write signals Brw and Crw to the buffer memory  16  and the cue-point memory  17  according the instruction from the system controller  20 . 
     In other words, when the address controller  15   c  specifies the address of the buffer memory  16  and the read/write controller  15   c  performs the writing control, the contents data Dd is stored on the specified address. On the other hand, when the address controller  15   c  specifies the address of the buffer memory  16  and the read/write controller  15   c  performs the reading control, the contents data Dd stored on the specified address is output as the contents data Dmb. 
     Moreover, when the address controller  15   c  specifies the address of the cue-point memory  17  and the read/write controller  15   c  performs the writing control, the contents data Dd is stored on the specified address. On the other hand, when the address controller  15   c  specifies the address of the cue-point memory  17  and the read/write controller  15   c  performs the reading control, the contents data Dd stored on the specified address is output as the contents data Dcue relating to the cue-point. 
     In addition, access timing by the address controller  15   c  and the read/write controller  15   d  when the contents data is read from the buffer memory  16  or the cue-point memory  17  changes in response to the rotation speed of the jog dial  41 . Moreover, the process speed described above changes according to the change of the access timing. 
     In other words, when instruction of the forward reproduction is given by the user or the like and then the jog dial  41  has stopped, the signal processor  15  reads the contents data Dmb or Dcue from the buffer memory  16  or the cue-point memory  17  at the access timing corresponding to a regular reproduction speed and processes the reproduction of the contents. Therefore, usual reproduction of the contents is performed at a regular processing speed. 
     On the other hand, if the rotating operation of the jog dial  41  is performed in a clockwise or a counter-clockwise direction, the signal processor  15  reads the contents data Dmb or Dcue from the buffer memory  16  or the cue-point memory  17  at the access timing corresponding to each rotation speed. Therefore, if the rotating operation of the jog dial  41  is performed in a clockwise or a counter-clockwise direction, the reproducing speed changes according to the change of the access timing. Thus, for example, if the jog dial  41  is operated while reproducing music or the like, sound of a reproduction speed different from a regular reproduction sound is reproduced. 
     In addition, in this example, it is constructed so that the access timing when the contents data is read from the buffer memory  16  or the cue-point memory  17  changes more complexly by adding the prescribed additional signal to an operating signal depending on the operation amount of the jog dial  41  by the operation of the scratch emulation processor  22  described below. By this, it is possible to change the processing speed (reproduction speed) during the reproduction of the contents more complexly. Such process will be explained later in more detail (refer to  FIG. 3  or later). 
     Incidentally, the reproduction speed described above corresponds to a switching speed of the reading address when performing the memory access to the buffer memory  16  or the cue-point memory  17  and switching sequentially the reading address, while reading the contents data stored on the buffer memory  16  or the cue-point memory  17  and reproducing the contents based on the contents data. 
     Therefore, the switching speed of the reading address to the buffer memory  16  or the cue-point memory  17  changes if jog dial  41  is operated. Then, if the contents is reproduced based on the contents data read from the buffer memory  16  or the cue-point memory  17  according to the changes of the switching speed, for example, video or sound of a tempo different from a regular reproduction sound or the like is reproduced on the display, speaker or the like. 
     Incidentally, in the forward reproduction described above, the contents data recorded in the optical disc  100  is reproduced in the order recorded as well as music is reproduced by rotating an analog record such as LP in a forward direction. Therefore, in response to the rotating operation performed on the jog dial  41  in a clockwise direction, music is reproduced as usual sound. Moreover, while the jog dial  41  has been stopped, the forward reproduction is performed. 
     On the other hand, in the reverse reproduction described above, the contents data recorded in the optical disc  100  is reproduced in the reverse order recorded as well as music is reproduced by rotating an analog record in a reverse direction. In other words, because music is sequentially recorded (recorded in analog) in the analog record, when the analog record is rotated in the reverse direction, a sound effect different from original music is reproduced. However, when the jog dial  41  is operated to rotate to a counter-clockwise direction, the same sound effect as reproducing the analog record by rotating to the reverse direction is generated. 
     Because of such function same as reverse reproducing of the analog record, when, for example, the user rotates the jog dial  41  back and forth to a clockwise direction and a counter-clockwise direction rapidly, the sound effect called a scratch sound (for example, sound effects like [Kyu Kyu] or [Gasha Gasha]) can be generated. In addition, a player called a disc jockey can edit to generate rap music using the CD or the DVD by operating the jog dial  41  to generate the scratch sound described above or the like. 
     Incidentally, the address controller  15   c  and the read/write controller  15   d  prohibit simultaneous writing of the contents data Dd from the decoder  15   b  and simultaneous reading of the contents data Dmb and Dd, by controlling the buffer memory  16  and the cue-point memory  17  respectively and separately. 
     Moreover, because a so-called writing process for recording the contents data Dd to each of the buffer memory  16  and the cue-point memory  17  having a prescribed memory capacity and a so-called reading process for reading the contents data Dmb and Dcue from the buffer memory  16  and the cue-point memory  17  are performed independently, a process of reading the information from the optical disc  100  of the optical pickup  10  and a process of reproducing the audio in the signal processor  15  have no influence to each other. 
     The data expander  15   e  expands the contents data Dmb or Dcue and supplies the expanded contents data Dex to the editor  19  shown in  FIG. 19 , when the contents data Dmb or Dcue compressed by the data compression technology is read from the buffer memory  16  or the cue-point memory  17 . Moreover, if the contents data Dmb or Dcue is not compressed, the contents data Dmb or Dcue is supplied to the editor  19  in status quo without the expansion of the data being performed. 
     In  FIG. 1  again, the spindle servo circuit  18  detects the error of the synchronous data to the rotation speed of the spindle motor  12  instructed by the system controller  20 , and performs a feedback control on the rotation of the spindle motor  12  in order to suppress the occurrence of the error. 
     The editor  19  generates an analog contents signal by performing digital-analog conversion on the contents data. Dex supplied from the signal processor  15  with the digital-analog converter which is not shown in the figure, and outputs it to the external output terminal  30  with amplifying its electric power. The output analog contents signal is output to an external output equipment such as a display and a speaker through the external output terminal  30  and reproduced as video and sound corresponding to the contents data recorded in the optical disc  100 . 
     Incidentally, the digital-analog converter described above converts the contents data Dex into the analog contents signal by synchronizing with a fixed sampling frequency which is decided according to a socalled sampling theorem. Therefore, when the switching speed of the reading address to the buffer memory  16  or the cue-point memory  17  changes by the operation of the jog dial  41  as described below, and then the number of the contents data Dex supplied to the digital-analog converter per unit time changes, the analog contents signal which allows reproduction of, for example, sound of a tempo different from a regular reproduction sound or the like is output from the digital-analog converter. 
     The system controller  20  is provided with a micro processing unit (MPU) having function of calculation and control. The system controller collectively controls the whole operation of the optical disc reproducing apparatus  1  by processing a predetermined system program. 
     Moreover, the system controller  20  is provided with the scratch emulation processor  22 . The scratch emulation processor  22  composes one specific example of “Generating device” of the present invention, and adds the prescribed additional signal to the operating signal which shows the operation amount of the jog dial  41  detected by the encoder  42  or the touch sensor  43 . By such process of the signal, the switching speed of the reading address to the buffer memory  16  or the cue-point memory  17  changes more complexly. As a result, the number of the contents data Dex supplied to the digital-analog converter per unit time changes more complexly. Such process will be explained later in more detail (refer to  FIG. 3  and such). 
     The operation unit  40  is provided with the jog dial  41 , the encoder  42 , the touch sensor  43  and the display  50 . The operation unit  40  is further provided with a plurality of operating buttons, for example, various operating buttons necessary for the reproducing operation such as a reproduction button, a pause button, and a stop button to direct the contents of the reproducing operation; a cue-point registration button to configure the cue-point described above; a cue-point specification button to specify the configured cue-point as the position for cue reproduction; and an edit button to be operated for adding various kind of sound effects. 
     The jog dial  41  composes one specific example of the “operating device” of the present invention, and is a disc-shaped operation key free to rotate to both directions (namely, a clockwise direction and a counter-clockwise direction). When the user operates the jog dial  41  while changing the rotation direction and the rotation speed properly, one of the forward reproduction or the reverse reproduction described above can be chosen according to the rotation direction, and the tone of the reproduced sound reproduced on the speaker and the headphone can be changed according to the rotation speed. 
     The encoder  42  composes one specific example of the “detecting device” of the present invention, and detects the rotation direction and the rotation speed (angular velocity) of the jog dial  41 . More specifically, the encoder  42  has the rotary encoder circuit, and optically detects the rotation direction and the rotation speed of the jog dial  41 . The detected rotation direction and rotation speed of the jog dial.  41  are output to the system controller  20  as the operating signal. By this, the system controller  20  recognizes the operation amount of the jog dial  41  operated by the user, and performs the effect process corresponding to the operation amount. Moreover, the scratch emulation processor  22  recognizes the operation amount of jog dial  41  operated by the user, and adds the prescribed additional signal to the operating signal corresponding to the operation amount. 
     Incidentally, regarding the rotation direction, if a clockwise direction is decided as the forward direction and a counterclockwise direction as the reverse direction, the operating signal shows the direction of the jog dial  41  with its sign, and shows the amplitude of the rotation speed (more specifically, the angular velocity) of the jog dial  41  with its value (it means absolute value). 
     The touch sensor  43  is a sensor to detect whether or not the user is operating the jog dial  41  (especially, whether or not the user is touching the jog dial  41  especially). 
     The display  50  displays various information according to the reproduction of the contents data. For example, the display  50  is provides with the display panels such as a liquid-crystal display and fluorescent tubes, and displays various information under the control of the system controller  20 . For instance, various information corresponding to the reproduction of the contents data may be displayed in display  50 . More specifically, a track number of the presently reproduced contents data, elapsed time of the presently reproduced contents data, and total track number of the contents data recorded in the optical disc  100  presently loaded in the optical disc reproducing apparatus may be displayed. In addition, the beat density of the contents data along the reproduction time axis may be displayed, and the amplitude of each bandwidth of the contents data presently reproduced may be displayed. 
     (2) Principle of the Operation 
     Next, with reference to  FIG. 3  to  FIG. 8 , an explanation will be given on the principle of the operation of the optical disc reproducing apparatus  1 . With reference to  FIG. 3 , an explanation will be given on the whole flow of the principle of the operation of the optical disc reproducing apparatus  1 , and with reference other figures, more specific explanation will be given properly.  FIG. 3  is a flowchart schematically showing a flow of the operation of the optical disc reproducing apparatus  1  relating to the example. Incidentally, in the following explanations, the explanation will be given focusing on the operation when the optical disc reproducing apparatus  1  adds the additional signal to the operating signal, for the simplification of the explanation. 
     As shown in  FIG. 3 , firstly, it is judged whether or not a turning on signal is detected by the touch sensor  43  (step S 101 ). In other words, it is judged whether or not the user is touching the jog dial  41  or the user is operating the jog dial  41 . If the user is touching the jog dial  41  or the user is operating the jog dial  41 , the turning on signal is detected by the touch sensor  43 . 
     As a result of the judgment, if the turning on signal has not been detected by the touch sensor  43  (step S 101 :No), the process of the scratch emulation is not processed and the operation is ended. However, it may be constructed to return to the step S 101  again and continue to judges whether or not the turning on signal is detected in touch sensor  43 . 
     On the other hand, if the turning on signal is detected in the touch sensor  43  (step S 101 :Yes), then it is judged whether or not the rotating operation is performed on the jog dial  41  (step S 102 ). 
     As a result of the judgment in step S 102 , if it is judged that the rotating operation is not performed on the jog dial  41  (step S 102 :No), the operation is ended. On the other hand, as a result of the judgment in step S 102 , if it is judged that the rotating operation is performed on the jog dial  41  (step S 102 :Yes), then the operating signal d which shows the operation amount of the jog dial  41  is obtained by the operation of the encoder  42  (step S 103 ). 
     Then, the additional signal d′ which vibrates continuously at a variable frequency or a fixed frequency is added to the operating signal d by the operation of the scratch emulation processor  22  (step S 104 ). As a result, the modulation signal d″(=d+d′) is generated (step S 104 ). 
     With reference to  FIG. 4  to  FIG. 7 , an explanation will be given on a specific mode of the addition signal d′. Each of  FIG. 4  to  FIG. 7  is a wave profile showing a specific mode of the additional signal. 
     As shown in the  FIG. 4 , it may be constructed to use the additional signal d′ changing in the mode of the sine wave. More specifically, it may be constructed so that the additional signal d′ where the sine wave of the amplitude A and the period of T appears repeatedly is added to the operating signal d. 
     As shown in the  FIG. 5 , it may be constructed so that the additional signal d′ changing in the mode of the sawtooth wave to the operating signal d. More specifically, it may be constructed so that the additional signal d′ where waves of the amplitude decreasing monotonously from +A to −A in one period T appear repeatedly is added to the operating signal d. 
     As shown in the  FIG. 6 , it may be constructed so that the additional signal d′ changing in the mode of the square wave to the operating signal d. More specifically, it may be constructed so that the additional signal d′ where waves of the amplitude +A when the period is between 0 and T/2 and the amplitude −A when the period is between T/2 and T appear repeatedly is added to the operating signal d. 
     As shown in the  FIG. 7 , it may be constructed so that the additional signal d′ changing in the mode of the triangle wave to the operating signal d. More specifically, it may be constructed so that the additional signal d′ where waves of the amplitude increasing monotonously from 0 to +A, then decreasing monotonously from +A to −A, and then increasing monotonously from −A to 0 in one period T appear repeatedly is added to the operating signal d. 
     The operation adding such additional signal d′ to the operating signal d corresponds to the operation changing the rotating direction (in other words, the reproduction direction) and the rotating speed (in other words, the reproduction speed) of the jog dial  41  shown by the operating signal d. In other words, the value of the additional signal d′ (that is, amplitude and sign) shows the increase and decrease of the reproduction speed of the contents data at a prescribed timing. If the sign of the operating signal d becomes to be different from the sign of the modulation signal d″ by adding the additional signal d′, it means that the reproduction direction changes from the forward direction to the reverse direction or from the reverse direction to the forward direction. 
     Of course, it is obvious that the additional signal explained by referring  FIG. 4  to  FIG. 7  is merely example. It may be constructed so that the additional signal d′ changing in other mode is added to the operating signal d. 
     In  FIG. 3  again, then the contents data is reproduced according to the reproduction speed and the reproduction direction determined based on the modulation signal d″ generated in the step S 104 , by the signal processor  15  operating under the control of the scratch emulation processor  22  (step S 105 ). In other words, the reproduction process of the contents data is performed so that the reproduction speed and the reproduction direction determined based on the modulation signal d″ generated in the step S 104  are achieved, while the access timing when the contents data is read from the buffer memory  16  or the cuepoint memory  17  being controlled (step S 105 ). More specifically, for example, if the value of the modulation signal d″ shows a relatively large positive value, the contents data is reproduced to a forward direction at a relatively fast reproduction speed. If the value of the modulation signal d″ shows a relatively small positive value, the contents data is reproduced to a forward direction at a relatively slow reproduction speed. If the value of the modulation signal d″ shows a negative value, the contents data is reproduced to the reverse direction. If the value of the modulation signal d″ repeatedly shoes a positive value and a negative value one after the other, the contents data is reproduced in the scratch reproduction. 
     With reference to  FIG. 8 , a specific explanation will be given on the reproduction speed determined based on the modulation signal d″.  FIG. 8  is a wave profile schematically showing the actual change of each of the operating signal d, the additional signal d′ and a modulation signal d″ which is a sum of the operating signal and the additional signal on the time axis of the reproduction, 
     It is assumed that the operating signal d shown in  FIG. 8(   a ) is detected as a result of the operation of the user on the jog dial  41 . Incidentally, the operating signal d shown in  FIG. 8(   a ) is commonly found when the scratch reproduction is performed. In other words, it is a mode of the change in the operating signal d commonly found as a result of the repeating operation of the jog dial  41  to each of a clockwise and a counter-clockwise direction, 
     Then, it is assumed that the additional signal d′ which changes in the mode of the sine wave shown in  FIG. 8(   b ) is added to the controlling signal d. 
     Then, the modulation signal d″ which is a sum o the operating signal d and the additional signal d′, shown in  FIG. 8(   c ) is calculated at the scratch emulation processor  22 . Incidentally, the operating signal d and the additional signal d′ are shown in  FIG. 8(   c ) in a dotted line and a chained line for reference. 
     In addition, the reproduction speed of the contents data is determined based on such modulation signal d″. By comparing  FIG. 8(   a ) and  FIG. 8(   c ), it can be indicated that the modulation signal d″ changes in more complex mode than the operating signal d does. Specifically, the modulation signal d″ changes like the operating signal d which vibrates slightly and continuously. Therefore, the reproduction speed of the contents data determined based on the modulation signal d″ also changes in a complex mode that vibrates slightly and continuously. As a result, the reproduction speed changes in the mode which cannot be achieved only by the manual operation of the jog dial  41  by the user. Specifically, the reproduction of the contents data which can be performed by shuttling the jog dial  41  to the clockwise direction and to the counter-clockwise direction continuously at relatively high-speed (the continuous slight movement scratch where the reproduction speed and the reproduction direction is changing continuously, such as the scribble, the bubble scratch or the like) is achieved. 
     In other words, the state which can be identical with the state where the modulation signal d″ changes in the complex mode shown in  FIG. 8(   c ) is detected as the operating signal d corresponding to the operation amount of the jog dial  41  is achieved. As a result, the reproduction speed changes in the mode which is difficult or impossible to be achieved only by the manual operation of the jog dial  41  by the user. In other words, it is possible that the operating signal d which changes in the mode which is difficult or impossible to be achieved only by the technique of the user is treated as being input by the operation of the jog dial  41  by the user. 
     As explained above, according to the optical disc reproducing apparatus  1 , the reproduction speed of the contents data is calculated based on the operating signal d with the additional signal d′ being added (in other words, the modulation signal d″) instead of merely based on the contents of the operation of the jog dial  41  by the user (in other words, the operating signal d). Therefore, the scratch reproduction (it means the continuous slight movement scratch) which is difficult or impossible to be achieved only by the manual operation of the jog dial  41  by the user can be achieved by adding the additional signal d′. 
     For example, even if the user who does not have the scratch skill (more specifically, cannot perform the continuous slight movement scratch) operates the jog dial  41 , the continuous slight movement scratch can be performed relatively ease by adding the additional signal d′. On the other hand, if the user who has the scratch skill operates the jog dial  41 , the continuous slight movement scratch in the special, complex, advanced and accurate mode which is impossible to be achieved by the manual operation of the jog dial  41  by the user can be achieved. Furthermore, it is obvious that the continuous slight movement scratch can be stably performed every time in the same mode as far as the same additional signal d′ is added. 
     Moreover, when the contents data is reproduced while adding the additional signal d′ described above to the operating signal d, the user need not operate the jog dial  41  in a complex mode. In other words, when the contents data is reproduced while adding the additional signal d′ described above to the operating signal d, the user only has to operate the jog dial  41  in a usual mode. Therefore, the burden of the operation of the user necessary to perform the continuous slight movement scratch can be reduced, as a result the continuous slight movement scratch can be achieved relatively easily. There is a large advantage that the burden of the operation of the user necessary to perform the continuous slight movement scratch not only in the mode which cannot achieved by the manual operation but also in the mode which can be achieved by the manual operation can be reduced by adding the additional signal d′. By this, the continuous slight movement scratch can be performed in the mode like the expert even if by the beginner player. 
     In addition, because the additional signal d′ is added while the jog dial  41  is pressed, the user can perform the continuous slight movement scratch by the operation with one hand. In other words, without operating the optical disc reproducing apparatus  1  and the effector or the mixer connected externally with both hands, the continuous slight movement scratch can be performed. 
     Incidentally, the effector which processes filtering on the audio output of the player cannot obtain the contents data following the contents data reproduced presently (that is, futural), in real time. By this, the reproduction speed of the contents data cannot be made faster than the reproduction speed of the player. Therefore, the effect similar to the scratch including operation which makes the reproduction speed faster cannot be added in real time. On the contrary, according to the optical disc reproducing apparatus  1 , the contents data following the contents data reproduced presently (that is, futural), can be obtained in real time by the operation of the signal processor  15  and the buffer memory  16 . As a result, the reproduction speed of contents data can be made faster and slower. Therefore, the continuous slight movement scratch including the operation which makes the reproduction speed faster or slower can be performed in real time. By virtue of this, it can be said that the optical disc reproducing apparatus  1  of this example has an effect that is more excellent than an existing equipment. 
     Incidentally, in the example described above, the additional signal d′ is added to the operating signal d while it is judged that the rotating operation is performed on the jog dial  41 . However, it may be constructed so that the additional signal d′ is added to the operating signal d even if it is judged that the rotating operation is not performed on the jog dial  41 . By virtue of such construction, even if the rotating operation is not performed by the user on the jog dial  41 , if the user merely touches the jog dial  41  (more specifically, if the touch sensor  43  outputs the turning on signal), the continuous slight movement scratch described above can be performed relatively easily. It is a large advantage from a viewpoint of improvement of the operability of the user. 
     On the other hand, it may be constructed so that whether or not to add the additional signal d′ is determined directly according to an operation button other than the jog dial  41 , in addition to or instead of the structure which adds the additional signal d′ by treating the pressing of the jog dial  41  or the rotating operation of the jog dial  41  as a trigger. In this case, as shown in the optical disc reproducing apparatus  1   a  of the other example of  FIG. 9 , a scratch emulation mode-in button  44  which composes one specific example of the “configuring device” of the present invention with the scratch emulation processor  22 , is preferably provided on the operating unit  40 . 
     The scratch emulation mode-in button  44  is an operation button which specifies whether or not to add the additional signal d′ to the operating signal d corresponding to the operation of the user using the jog dial  41 . If the user turns on the scratch emulation mode-in button  44 , the additional signal d′ corresponding to the operation of the user using the jog dial  41 , is added to the operating signal d. On the other hand, if the user turns off the scratch emulation mode-in button  44 , the additional signal d′ corresponding to the operation of the user by using the jog dial  41  is not added to the operating signal d, and the forward reproduction, the reverse reproduction, and the scratch reproduction are performed as usual. 
     As described above, it can be decided whether or not to add the additional signal d′ to the operating signal d based on the instruction of the user using the scratch emulation mode-in button  44  which is the operation buttons other than the jog dial  41 . Therefore, it is possible to perform the continuous slight movement scratch relatively easily by adding the additional signal d′, and to perform the forward reproduction, the reverse reproduction, and the scratch reproduction as usual without adding the additional signal d′ if the user wants. Therefore, the reproduction of the contents data can be performed in more various modes. 
     Moreover, because it can be switched whether or not to add the additional signal d′ by operating a single button, the operability of the user can be improved. Incidentally, the switching whether or not to add the additional signal d′ can be achieved by changing the amplitude of the additional signal d′ as describe below. Specifically, it can be achieved by even making the amplitude of the additional signal d′ “0”. However, from a viewpoint of improvement of the operability of the user, the scratch emulation mode-in button  44  which can switch whether or not to add the additional signal d′ by operating a single button (especially, it can switch by ON/OFF in digital) is preferably provided. 
     Moreover, it may be constructed that parameters which determine the additional signal d′ (more specifically, the amplitude, the frequency and the period of the additional signal d′) shown in  FIG. 4  to  FIG. 7  are changed properly. With reference to  FIG. 10 , an explanation will be given on the mode of the change of the parameters of the additional signal d′.  FIG. 10  is a wave profile schematically showing changes of parameters which determine the additional signal. 
     As shown in  FIG. 10(   a ), in a standard additional signal d′, sine wave of the amplitude increasing monotonously from 0 to +A, then decreasing monotonously from +A to −A, and then increasing monotonously from −A to 0 in one period T appears repeatedly. 
     Regarding such standard additional signal d′, it may be changed so that the frequency of the additional signal d′ decreases (or increases) as shown in  FIG. 10(   b ). It may also be changed so that the frequency of the additional signal d′ increases by n times (it means, the period decreases by 1/n times). The frequency of the additional signal d′ corresponds to the number of the reciprocal operation of the jog dial  41  per unit time, by using the scratch reproduction as an example. Therefore, by changing the frequency of the additional signal d′, the user can perform the continuous slight movement scratch in the more various modes relatively easily while reducing the burden of the operation on the jog dial  41  by the user. In addition, by changing the frequency of the additional signal d′, the continuous slight movement scratch can be performed in the mode which is difficult or impossible to be achieved only by the operation of the jog dial  41  by the user. Especially, as the frequency of the additional signal d′ increases, the continuous slight movement scratch which is difficult or impossible to be achieved only by the operation of the jog dial  41  by the user can be performed. 
     Regarding such standard additional signal d′, it may be changed so that the amplitude of the additional signal d′ decreases (or increases) as shown in  FIG. 10(   c ). It may also be changed so that the amplitude of the additional signal d′ increases by m times. The amplitude of the additional signal d′ corresponds to the operating angle (it means the operation amount) of the jog dial  41  in a single reciprocal operation, by using the scratch reproduction as an example. Therefore, by changing the amplitude of the additional signal d′, the user can perform the continuous slight movement scratch in the more various modes relatively easily while reducing the burden of the operation on the jog dial  41  by the user. In addition, by changing the amplitude of the additional signal d′, the continuous slight movement scratch which is difficult or impossible to be achieved only by the operation of the jog dial  41  by the user can be performed. 
     The changing operation of the frequency and the amplitude of the additional signal d′ may be performed based on the instruction of the user using an operation button provided on the operating unit  40 . In this case, as shown in the optical disc reproducing apparatus  1   b  of the other example of  FIG. 11 , a frequency decreasing button  411  for decreasing the frequency of the additional signal d′; a frequency increasing button  412  for increasing the frequency of the additional signal d′; an amplitude decreasing button  413  for decreasing the amplitude of the additional signal d′; and an amplitude increasing button  414  for increasing the amplitude of the additional signal d′ are preferably provided on the operating unit  40 . If the instruction for changing the frequency or the amplitude of the additional signal d′ is input to the system controller  20  through these buttons  411  to  414  provided on the operating unit  40 , the scratch emulation processor  22  adds the additional signal d′ whose frequency or amplitude is changed as shown in  FIG. 10(   b ) or  FIG. 10(   c ) to the operating signal d. 
     Incidentally, the scratch emulation processor  22  itself or the combination of the buttons  411  to  414  provided on the operating unit  40  and the scratch emulation processor  22  composes one specific example of the “amplitude changing device” or the “frequency changing device” of the present invention. 
     Moreover, the changing operation of the frequency and the amplitude of the additional signal d′ may be performed according to the rotation speed and the rotation amount of the jog dial  41 . For example, it may be constructed so that the amount of changes of the frequency or the amplitude changes according to the change in the rotation speed and the rotation amount of the jog dial  41 . 
     Incidentally, in the examples described above, the explanation is given on the optical disc reproducing apparatus  1  which reproduces the contents data recorded in the optical disc  100 . However, it is obvious that in the case of the reproducing apparatus which reproduces the contents data recorded in various recording medium other that the optical disc  100  (for example, a hard disc, a memory card or the like), it is possible to receive the same effects as the optical disc reproducing apparatus  1  receives by adopting the same structure as the optical disc reproducing apparatus  1  (specifically, the structure reproduces the contents data based on the modulation signal d″ generated by adding additional signal d′ to the controlling signal d). 
     The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. 
     The present invention can be applied to the information reproducing apparatus and method reproducing the video information or the sound information recorded in the recording medium, especially to the DJ equipment, LTJ equipment or the like.