Patent Publication Number: US-9900719-B2

Title: Level setting apparatus and storage medium

Description:
TECHNICAL FIELD 
     The invention relates to a level setting apparatus capable of displaying a level set as an individual level and a level in which a level set for a group is reflected, and a storage medium containing program instructions enabling a computer to function as such a level setting apparatus. 
     Priority is claimed on Japan Patent Application No. 2015-48468 filed Mar. 11, 2015, the contents of which are incorporated herein by reference. 
     BACKGROUND ART 
     A mixer includes input channels for a plurality of microphone/line inputs as input signal series, and transmits an audio signal from each of the input channels to a mixing bus. The resultant audio signal from the mixing bus is outputted through a plurality of output channels being output signal series. In each input channel, frequency characteristics and a volume level are set, and further a send level for the transmission to the mixing bus is set. 
     In a conventional mixer, a function in which a plurality of channel faders each provided at respective input channels are put together as a DCA group, and the channel faders in the same group are operated together according to operation on a DCA fader is known. In this case, an output level actually used in volume adjustment in the input channel is a level in which a DCA level set by the DCA fader is reflected on a fader level set by the channel fader. In the conventional mixer, a position of a knob of the channel fader indicates the fader level. Further, it is known that the actually used output level is displayed by the position of the knob by moving, in response to an operation of a switch, the position of the knob of the channel fader to a position in which the DCA level of the DCA fader is reflected on the fader level (refer to PTL1). It becomes thereby possible to easily check the actually used output level by operating the switch. The DCA level set by the DCA fader is not reflected to the position of the knob of the channel fader as long as the switch is not operated, and therefore, it is possible to finely set the fader level by moving the knob of the channel fader. 
     CITATION LIST 
     Patent Literature 
     {PTL1} JP 2004-253876 A 
     SUMMARY OF INVENTION 
     Technical Problem 
     In the conventional mixer, it was possible to temporarily display the output level in which the DCA level set by the DCA fader is reflected. However, it was not possible to constantly and simultaneously display both the fader level set by the channel fader and the output level, in which the DCA level is reflected to the fader level, actually reflected to the level of the audio signal outputted from the input channel, in such a manner that the fader level and the output level can be compared with each other. Namely, there was a problem that it was impossible to compare the fader level and the output level, and the user could not effectively set the levels. 
     An object of the invention is to enable, in a level setting apparatus, to constantly and simultaneously display a level set for an individual channel and a level, in which a level set for a group of the channels are reflected, actually reflected to an output of the channel. 
     Solution to Problem 
     To attain the above object, a level setting apparatus of the invention is a level setting apparatus, including: an individual level controller for setting individual levels of respective channels of a plurality of channels; a group controller for forming a group to which one or more channels among the plurality of channels belong; a group level controller for setting a group level of the group; and a display controller for controlling a display to display the individual level by each channel, and as for the grouped channels, overlay-display the individual level of the channel on an output level of the channel, the output level indicating level of output from the channel based on the individual level of the channel and the group level of the group to which the channel belongs. 
     Advantageous Effects of Invention 
     In a level setting apparatus of the invention, a level in which a group level set by a group level controller is reflected on an individual level set by an individual level controller is overlay-displayed on a display of the individual level, as an output level which indicates level of the output from an individual channel as for grouped one or more channels on a display device which displays the individual level set by the individual level controller. It becomes thereby possible to compare the individual level set by the individual level controller and the output level, in which the group level set by the group level controller is reflected, actually reflected to the output, by checking the display device. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a circuit block diagram illustrating a major configuration of a mixer including a level setting apparatus which is an embodiment of the invention. 
         FIG. 2  is a block diagram illustrating a hardware configuration of the mixer illustrated in  FIG. 1 . 
         FIG. 3  is a flowchart of a display process executed in the mixer illustrated in  FIG. 1 . 
         FIG. 4A  is a view illustrating a channel screen for input channels displayed by the mixer illustrated in  FIG. 1 , and an enlarged view of a part thereof. 
         FIG. 4B  is a view illustrating the channel screen in a display mode different from that in  FIG. 4A . 
         FIG. 5  is a view illustrating a main screen for an input channel displayed by the mixer illustrated in  FIG. 1 , and an enlarged view of a part thereof. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A circuit block diagram illustrating a major configuration of a mixer  1  including a level setting apparatus which is an embodiment of the invention is illustrated in  FIG. 1 . 
     In  FIG. 1 , the mixer  1  includes n pieces of input channels  10 - 1 ,  10 - 2 , . . . ,  10 - n . Frequency characteristics and levels of an audio signal to be transmitted to AUX buses  12  and an ST bus  13  are controlled at each of the input channels  10 - 1  to  10 - n . The level setting apparatus which is an embodiment of the invention includes the input channels  10 - 1  to  10 - n , and a display device, on which a later-described channel screen  30  and main screen  40  are displayed, provided on a not-illustrated panel of the mixer  1 . An audio signal IN 1  is inputted to the input channel  10 - 1 , an audio signal IN 2  is inputted to the input channel  10 - 2 , . . . , and an audio signal INn is inputted to the input channel  10 - n . Each of the input channels  10 - 1  to  10 - n  has the same configuration, where a head amplifier (HA)  21 , an equalizer (EQ)  22 , a compressor (COMP)  23 , a fader (FADER)  24 , a pan (PAN)  25  are connected in cascade and a send (SEND)  26  is provided. The HA  21  is an amplifier for amplifying the inputted audio signal IN (hereinafter reference signs without the subscripts such as “1” to “n” when it is not necessary to specify the individuals) to a predetermined level, the EQ  22  is an equalizer for adjusting frequency characteristics of the audio signal In 1  to Inn) of the input channel  10 , and for example, the EQ  22  is capable of varying the frequency characteristics of respective four bands of HI, MID HI, LOW MID, and LOW. Besides, the compressor  23  prevents that the audio signal IN of the input channel  10  is saturated by narrowing down dynamic ranges of the audio signal IN. The fader  24  is a level controller for controlling level of the audio signal IN of the input channel  10 . The fader  24  is operated by the user using, for example, a moving fader. The pan  25  is for adjusting LR localization of a stereo signal transmitted from the input channel  10  to the stereo (ST) buses  13  of two lines of LR. Further, the audio signal at an extraction point either prior to or posterior to the fader  24  is supplied to the send  26 , and the send  26  controls, based on values of send levels, level of the audio signal transmitted to plural pieces (m pieces) of AUX buses  12  for mixing, for each piece of the buses. In this case, a pre-fader signal from the extraction point prior to the fader  24  or a post-fader signal from the extraction point posterior to the fader  24  is selectively supplied to the send  26  for each of the m pieces of AUX buses  12 . The send  26  controls the level of each signal and transmits each level controlled signal to the corresponding piece of AUX bus  12 . 
     Besides, in the mixer  1 , there is a function of forming a group of some of the faders  24  provided in the input channels  10 - 1  to  10 - n  as a DCA group. The faders  24  belonging to the same DCA group are operated together according to an operation to a DCA fader  11 . A group controller is provided in the mixer  1 , the group controller is capable of creating a plurality of DCA groups, and an arbitrary input channel  10  can be added into or removed from an arbitrary DCA group. In the input channel  10  belonging to the DCA group, the level of the audio signal transmitted from the fader  24  is actually controlled according to an output level in which the DCA level set using the DCA fader  11  is reflected on the fader level set for the fader  24 . 
     The mixer  1  is capable of mixing audio signals in the m pieces of AUX buses  12  and the ST bus  13  by supplying the audio signal from the respective input channels  10 - 1  to  10 - n  to an arbitrary bus among the AUX buses  12  and the ST bus  13 . The resultant signals mixed in the m pieces of AUX buses  12  are respectively outputted to corresponding output channels  14  among m pieces of output channels  14 - 1 ,  14 - 2 , . . . ,  14 - m . Besides, the resultant stereo signal mixed at the ST bus  13  is outputted to a stereo (ST) output channel  15 . Each of the output channels  14 - 1 ,  14 - 2 , . . . ,  14 - m  and the stereo output channel  15  includes an equalizer, a compressor, a fader, and so on connected in cascade to control the frequency characteristics and the level of the audio signal inputted thereto and outputs the resultant audio signal. A block diagram illustrating a hardware configuration of the mixer  1  is shown in  FIG. 2 . 
     In the mixer  1  illustrated in  FIG. 2 , a signal processing on the audio signal is executed by a DSP (digital signal processor)  52 . The DSP  52  performs the signal processing at each of the input channels  10 - 1  to  10 - n , the AUX buses  12 , the ST bus  13 , the output channels  14 - 1  to  14 - m , and the stereo output channel  15  under a control of a CPU (central processing unit)  50 . These signal processing may be performed using software executed by the CPU  50 . A total control of the mixer  1  is performed by the CPU  50 . A memory  51  includes a flash memory and a RAM (random access memory). Operation software such as a level setting program executed by the CPU  50  and various data are stored in the flash memory, and work memory areas for the CPU  50 , areas for storing temporary data, and so on are prepared in the RAM. Incidentally, a part of the area of the flash memory may be used as the RAM, and a rewritable nonvolatile memory device such as a hard disk may be used instead of the flash memory. A display portion  53  being a display is a liquid crystal display device or the like, and screens such as later-described channel screen  30  and main screen  40  are displayed thereon. An operation portion  54  includes controls for editing various parameters used for the signal processing, including fader levels used in the faders  24 , and the send levels used in the send  26 , and so on. The operation portion  54  detects operations of the controls, and edits values of the parameters based on detected operations. A display portion  53  provided with a touch panel may be used. In this case, the touch panel may be used as the operation portion  54 . An I/F  55  is an interface to connect with an external equipment. The I/F  55  may be a network interface, a serial interface such as a USB (universal serial bus), and so on. An audio I/F  56  includes an analog input port for inputting an audio signal to the mixer  1 , an analog output port for outputting resultant audio signal processed in the mixer  1  to the external devices, and a digital input/output port for inputting a digital signal to the mixer  1  and outputting resultant digital audio signal processed in the mixer  1  to the external devices. The audio signal inputted via the analog input port is converted into a digital signal and then transmitted to an audio and communication bus  57 . The digital audio signals inputted via the digital input/output port is also transmitted to the audio and communication bus  57 . The DSP  52  receives the digital audio signals transmitted to the audio and communication bus  57  and performs predetermined signal processing on the digital audio signals. The audio signals outputted from the DSP  52  to the audio and communication bus  57  can be provided to a speaker or the like via the audio I/F  56 . 
     The mixer  1  executes the level setting program which is an embodiment of the invention, and thereby, functions as a level setting apparatus described below. In the level setting apparatus, the CPU  50  performs a display process which includes calculating an actual output level (channel level) of the audio signal outputted from the fader  24  of each of the input channels  10 - 1  to  10 - n  and displaying the calculated channel levels. Further, the display process includes overlay-displaying the fader levels set for the faders  24  on the display section for displaying the channel levels in the later-described channel display screen  30 . In the display process, as for the input channel  10  which belongs to the DCA group, a level which is calculated by reflecting the DCA level set by the DCA fader  11  to the fader level set for the fader  24  is displayed as the channel level. On the other hand, as for the input channel  10  which does not belong to the DCA group, only the fader level is displayed and the channel level is not displayed, since the fader level set for the fader  24  is used as the channel level. 
     A flowchart of the display process executed by the CPU  50  is illustrated in  FIG. 3 . The display process is started at every predetermined timings, and once the display process starts, the display process is executed as for every channel which is to be displayed (this channel will be referred to as “target channel”). Namely, the process in  FIG. 3  is repeated at the CPU  50  for every channel which is to be displayed. When the display process is started, the CPU  50  judges whether or not the target channel is a channel to which the DCA level is to be reflected (a channel belonging to the DCA group) at step S 10 . When the target channel does not belong to the DCA group, it is judged that the DCA level is not to be reflected, and the process goes to step S 11 . At the step S 11 , the CPU  50  displays only the fader level set for the fader  24  of the target channel on the display portion  53 . Besides, when the target channel belongs to the DCA group, it is judged that the DCA is to be reflected at the step S 10  and the process goes to step S 12 . At the step S 12 , the CPU  50  calculates the channel level of the target channel by multiplying the fader level by the DCA level set by the DCA fader  11 , and overlay-displays the calculated channel level on the fader level set for the fader  24  of the target channel on the display portion  53 . When the process at the step S 11  or the step S 12  ends, the display process ends. Note that the calculation of the multiplication is performed at the step S 12  when the fader level and the DCA level are in linear scales. In case of dB scales, the channel level displayed on the display portion  53  is calculated by adding the DCA level to the fader level. The level to be displayed on the display portion  53  is updated and stored in a storage device in the steps S 11  and S 12 . 
     A channel screen for the input channel displayed on the display portion  53  of the mixer  1  and an enlarged view of a part thereof are illustrated in  FIG. 4A . The channel screen in a display mode different from that in  FIG. 4A  is illustrated in  FIG. 4B . 
     The mixer  1  is capable of displaying the channel screen  30  illustrated in  FIG. 4A  on the display portion  53  according to an operation by a user. The channel screen  30  is a screen for displaying setting states of major parameters of each input channel  10 . In the illustrated example, the setting states of the parameters of the first input channel  10 - 1  to the eighth input channel  10 - 8  are displayed on the channel screen  30 . Besides, the first input channel  10 - 1  to the eighth input channel  10 - 8  belong to the DCA group, and a DCA level display section  11   a  for displaying the DCA level of the DCA group set by the DCA fader  11  is provided. On the upper side of the DCA level display section  11   a , a DCASW  11   b  is provided. As for each of the first to eighth input channels  10 - 1  to  10 - 8 , a later-described channel level display section  31   b  for displaying the channel level indicating the level of the audio signal actually outputted from the input channel  10  is provided. Further, a later-described fader level indicator  31   c  for displaying the fader level set by the fader  24  of each input channel  10  is overlay-displayed on the channel level display section  31   b  of the same input channel  10 . Besides, as for each of the first input channel  10 - 1  to the eighth input channel  10 - 8 , the setting states of other parameters the input channel  10  are also displayed, and they will be explained using the display section for the fourth input channel  10 - 4  in the enlarged view as an example. 
     As for the fourth input channel  10 - 4  whose setting states of the parameters are displayed as in the enlarged view in  FIG. 4A , a channel number “CH4” of the fourth input channel  10 - 4  is displayed at a channel number section  31   a , and the channel level display section  31   b  and the fader level indicator  31   c  are provided at an upper side thereof. The fader level indicator  31   c  is a mark in a laterally long and narrow rectangular form which simulates a knob of the fader, and indicates the value of the fader level by a height position from a bottom of the channel level display section  31   b . The channel level display section  31   b  is displayed by a rectangular frame which is longitudinally long, and for example, the channel level is displayed by a length of a deep color bar from a bottom. The channel level displayed in the channel level display section  31   b  indicates a level value used for controlling the level of the audio signal outputted from the input channel  10  (the channel level can by calculated using the formula of: (the fader level set for the fader  24 )×(the DCA level set by the DCA fader  11 )). The channel level indicates level of the audio signal outputted from the fader  24  and then outputted from the channel  10 . The above fader level indicator  31   c  is overlay-displayed on the channel level display section  31   b  using a common scale in the height direction. A pan section  25   a  for displaying the localization state of the pan  25  is provided on an upper side of the channel level display section  31   b , and a channel switch (CHSW)  27   a  for turning on and turning off the input channel  10  is displayed on a further upper side thereof. A switch corresponding to the CHSW  27   a  is inserted into a line connecting the fader  24  and the pan  25  illustrated in  FIG. 1  at a position prior to the branch for outputting the post-fader audio signal to the AUX buses  12  and the ST bus  13 . Therefore, when the switch is turned off according to an operation on the CHSW  27   a , the transmissions from the fader  24  to the AUX buses  12  and the ST bus  13  are turned off. 
     Note that when displaying the channel level display section  31   b , the channel level which actually indicates the level of the audio signal transmitted from the fader  24 , which is calculated in the display process illustrated in  FIG. 3 , is read out from the memory, and the length of the displayed deep color bar is determined to be a length corresponding to the channel level. In the illustrated case, the fourth input channel  10 - 4  (the name of which is “CH4”) belongs to the DCA group, and the channel level in which the fader level set for the fader  24  of the fourth input channel  10 - 4  is multiplied by the DCA level set by the DCA fader  11  is displayed. The display styles are also the same in the other input channels (CH1 to CH3, CH5 to CH8). 
     As stated above, when the channel screen  30  is displayed, the fader level which is set for the fader  24  is overlay-displayed on the channel level which indicates the level of the audio signal transmitted from the fader  24 , thereby displaying the fader level and the channel level constantly and simultaneously. Accordingly, it becomes possible for the user to effectively set the levels while comparing the fader level and the DCA level by checking the channel screen  30 . 
     Incidentally, when the CHSW  27   a  is turned off as stated above, the audio signal is not outputted from the fader  24  to the AUX buses  12  and the ST bus  13 , and therefore, the level of the audio signal which is actually transmitted from the fader  24  becomes a minimum level. The display style of the channel screen  30  when the CHSW  27   a  is turned off is illustrated in  FIG. 4B . 
     In the example illustrated in  FIG. 4B , the CHSWs  27   a  of the third, fifth and sixth input channels  10 - 3 ,  10 - 5  and  10 - 6  (the names are “CH3”, “CH5”, and “CH6”) are turned off, and the CHSWs  27   a  are displayed in gray. In each of the channel level display sections  31   b  of the third, fifth and sixth input channels  10 - 3 ,  10 - 5  and  10 - 6  respectively indicated by the names of “CH3”, “CH5”, and “CH6”, the zero level is displayed as the channel level indicating the level of the audio signal outputted from the input channel  10 . However, the fader level which is set for the fader  24  is displayed at the fader level indicator  31   c  regardless of the turning on and off of the CHSW  27   a . Note that in the above-stated display process, the turning on and off of the CHSW  27   a  is reflected to the channel level indicating the level of the audio signal outputted from the input channel  10 , and the zero level is obtained through the calculation and displayed when the CHSW  27   a  is turned off. Note that the zero level is obtained when the fader level and the DCA level are in the linear scales, and the minimum level is obtained in case of the dB (decibel) scales. 
     A constitution of the main screen  40  of the input channel displayed on the display portion  53  of the mixer  1  which is an embodiment of the invention and an enlarged view of a part thereof is illustrated in  FIG. 5 . 
     When the user performs an operation to display the main screen  40 , the main screen (CH View)  40  for the input channel  10  illustrated in  FIG. 5  is displayed on the display portion  53 . The illustrated example is the main screen  40  for the first input channel  10 - 1 , and the channel name of “Ch. 1 Vocal” and various parameters set for the first input channel  10 - 1  are displayed. Note that a not-illustrated channel move button is provided in the mixer  1 , and the main screen  40  for any of the input channels from among the second to n-th input channel  10 - 2  to  10 - n  can be displayed by operating the channel move button. The main screen  40  has a common constitution for all of the input channels. The main screen  40  includes: a HA section  21   a  made up of a knob which indicates the gain of the HA  21  by a rotation angle and a level meter; an EQ section  22   a  made up of a graph of the frequency characteristics of the EQ  22  and a level meter; and a Comp section  23   a  made up of a graph representing the output level characteristics of the compressor  23  and a level meter. These sections are disposed from a left side to an approximate center portion. Further, a Fader section  24   a  which includes a knob for setting the fader level of the fader  24  and a level meter thereof are displayed on the right side of the Comp section  23   a . The PAN section  25   a  which indicates the localization position of the PAN  25  is displayed on the upper side of the Fader section  24   a . The CHSW  27   a  for turning on and off the input channel is displayed on the further upper side of the PAN section  25   a . Further, on the right side of the above sections, displayed is an AUX bus send area  41  including: a later-described level display section  42   c  which overlay-displays send levels set by send faders provided for the send  26  onto the levels of the audio signals actually transmitted to each bus of the m pieces of AUX buses  12 ; and a later-described Pre/Post display section  42   b . An example of the AUX bus send area  41  in which the AUX buses  12  has eight pieces of the buses is illustrated in  FIG. 5 . 
     A display style of the section relating to the first bus of the AUX buses  12  among the AUX bus send area  41  is enlarged in  FIG. 5 . As illustrated in this drawing, in the enlarged section, bus number of “1” is displayed at a bus number section  42   a , the Pre/Post display section  42   b  is disposed on the right side thereof, and the level display section  42   c  which indicates the send level set by the send fader by a position of a send level indicator  42   d  which simulates a knob of the fader is displayed on the a right side of the Pre/Post display section  42   b . The audio signal which is outputted from the send  26  connected to the first bus is supplied to the first bus of the AUX buses  12 . The Pre/Post display section  42   b  indicates, with an outlined circle, that the audio signal of pre-fader (PRE) is supplied from an extraction point prior to the fader  24  to the send  26  which is connected to the first bus, and indicates, with a marked-out black circle, that the audio signal of post fader (POST) is supplied from an extraction point posterior to the fader  24  to the send  26  which is connected to the first bus. Besides, a level indicating the level of the audio signal which is actually transmitted from the send  26  is calculated by multiplying the channel level calculated in the display process illustrated in  FIG. 3  by the send level set by the send fader, and the calculated level is displayed in the level display section  42   c  by a length of a bar in a deep color. The send level indicator  42   d  indicating the send level is overlay-displayed on the corresponding level display section  42   c . The display styles are the same as for the other buses of the AUX buses  12 . 
     As stated above, the send level and the level of the audio signal which is actually transmitted from the send  26  can be constantly and simultaneously displayed in the AUX bus send area  41  due to the above overlay-display. Accordingly, it becomes possible for the user to effectively set the levels of the audio signals transmitted from the respective input channels  10  to the respective buses among the AUX buses  12  while comparing the send level, the fader level and the DCA level by checking the AUX bus send area  41 . 
     INDUSTRIAL APPLICABILITY 
     In the mixer including the level setting apparatus which is an embodiment of the invention described hereinabove, the function to set the fader levels for the faders  24  each provided at the respective input channels corresponds to an individual level controller for setting individual levels of respective channels of a plurality of channels. Besides, the DCA fader  11  and the function to set the DCA level corresponds to a group level controller for setting a group level of the group. The group controller creating a plurality of DCA groups, and adding an arbitrary input channel  10  into or removing an arbitrary input channel  10  from an arbitrary DCA group corresponds to a group controller for forming a group to which one or more channels among the plurality of channels belong. The function to display the channel level at the channel level display portion  31   d  and overlay-display the fader level set for the fader  24  at the fader level indicator  31   c  on the channel level display portion  31   d  corresponds to a display controller for controlling a display to display the individual level by each channel, and as for the grouped channels, overlay-display the individual level of the channel on the output level of the channel. The channel level indicating the level of the audio signal actually outputted from the input channel  10  and calculated by multiplying the fader level by the DCA level corresponds to the output level indicating level of output from the channel based on the individual level of the channel and the group level of the group to which the channel belongs. 
     Note that as for the input channel which does not belong to the DCA group, only the fader level is displayed in the mixer, but the channel level which is the same value as the fader level may be displayed at the fader level indicator  31   c.    
     The above-described send  26  of the mixer  1  includes m pieces of selectors which is the same number as the AUX buses  12  for selecting the pre-fader signal or the post-fader signal and m pieces of send portions which are respectively connected in cascade to the selectors. The send level is set for each transmission from each send portion to each of m-pieces of AUX buses  12 . 
     The level setting apparatus according to the invention has been described as the level setting apparatus of the mixer, but it is not limited thereto, and for example, the level setting apparatus may be a level setting apparatus which controls illumination levels of respective illuminations of an illumination device including a plurality of illuminations. In this case, individual illumination levels of the plurality of illuminations can be set by the individual level controller, and the illumination levels of a group of illuminations can be collectively controlled by the group level controller. 
     REFERENCE SIGNS LIST 
       1  . . . mixer,  10 - 1  to  10 - n  . . . input channel,  11  . . . DCA fader,  11   a  . . . DCA level display section,  11   b  . . . DCASW,  12  . . . AUX bus,  13  . . . ST bus,  14 - 1  to  14 - m  . . . output channel,  15  . . . stereo output channel,  21  . . . HA,  21   a  . . . HA section,  22  . . . EQ,  22   a  . . . EQ section,  23  . . . compressor,  23   a  . . . Comp section,  24  . . . fader,  24   a  . . . Fader section,  25  . . . pan,  25   a  . . . PAN section,  26  . . . send,  30  . . . channel screen,  31   a  . . . channel number section,  31   b  . . . channel level display section,  31   c  . . . fader level indicator,  40  . . . main screen,  41  . . . AUX bus send area,  42   a  . . . bus number section,  42   b  . . . Pre/Post display section,  42   c  . . . level display section,  42   d  . . . send level indicator,  50  . . . CPU,  51  . . . memory,  52  . . . DSP,  53  . . . display portion,  54  . . . operation portion,  55  . . . I/F,  56  . . . audio I/F,  57  . . . audio and communication bus