Abstract:
A digital sound-signal broadcaster includes a control faceplate to control the rotating speed and direction of a turntable so as to operate the music data of a CD stored in a dynamic memory chip to make a variety of special sound effects to heighten atmosphere of joy, not only easy in handling and convenient in carrying but possible to prevent any wear as well.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to a digital sound-signal broadcaster, particularly to one capable to make a variety of special sound effects by means of a CD, easy in using and convenient for carrying and possible to prevent any wear. 
     Conventionally, on an occasion like a pub, a dancing party, a concert or the like, a DJ always makes various special sound effects while broadcasting music by controlling a record to rotate clockwise or counterclockwise and regulate its rotating speed by hands in order to heighten atmosphere of joy, but such a way of handling by hands has some defects described below. 
     1. A conventional plastic-made disk can broadcast music only in a way of letting the pickup and a record contacting with each other and rotating at a definite speed and direction. If the rotating speed and direction of a record is controlled by hands, the pickup and the record are easy to be damaged and must be replaced very often, thus wasting much money. 
     2. Not much songs can be recorded in such a conventionally plastic-made record, so in order to prepare enough music for broadcasting, a great number of records have to be prepared in advance, inconvenient in carrying and handling. 
     3. It is not easy to directly pick out a song he/she wants in such a conventional record without experience, inconvenient in the process of broadcasting. 
     SUMMARY OF THE INVENTION 
     The primary objective of this invention is to offer a digital sound-signal broadcaster in which music data of a common CD is read and stored in a dynamic memory chip, and, by checking the rotating speed and direction of the turntable, this music data is modulated to output a variety of special sound effects, possible to prevent any wear. 
     The second objective of this invention is to offer a digital sound-signal broadcaster in which the music data in a CD can be processed into various special sound effects, and a CD is light and further has a capacity of storing lots of music data, easy and convenient in use and carrying. 
     The third objective of this invention is to offer a digital sound-signal broadcaster, which has a the control faceplate capable to control and show the condition of songs picked out so that a DJ call handler to select a song he/she wants and to make various sound effects. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     This invention will be better understood by referring to the accompanying drawings, wherein: 
     FIG. 1 is a block diagram of an electronic circuit of the present invention. 
     FIG. 2 is a perspective view of a turntable of the present invention. 
     FIG. 3 is a perspective view of another embodiment of a turntable of the present invention. 
     FIG. 4 is a diagram of the first judging of timing by a photosensitive speed detector of the present invention. 
     FIG. 5 is a diagram of the second judging of timing by the photosensitive speed detector of the present invention. 
     FIG. 6 is a diagram of the third judging of timing by the photosensitive speed detector of the present invention. 
     FIG. 7 is a diagram of the fourth judging of timing by the photosensitive speed detector of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     An embodiment of a digital sound-signal broadcaster of this invention, as shown in FIG. 1, includes an electronic circuit and some other components. 
     The process of handling the digital sound-signal broadcaster of this invention is as follows. 
     A CD is placed on a disk tray  12  positioned on a saucer disk drive motor  11  controlled by a drive IC  1 , and inputting and withdrawing of the CD is controlled by a proceeding motor  13  driven by a drive IC  1 , and then a system micro-processor  2  is actuated to let a high frequency amplifier  3  turn on a laser light and activate a CD digital processor  4  to start a laser pickup  14  via the drive IC  1 . The laser pickup  14  driven to rotate around by a pickup proceeding motor  15  controlled by the drive IC  1  will transmit a signal via the high frequency amplifier  3  to said CD digital processor  4  which will notify the system micro-processor  2  whether the signal is focused or not. In case the signal fails to be focused, the system micro-processor  2  will stop any action, and on the contrary, if the signal is successfully focused, it will control the CD digital processor  4 , and at the same time a disk drive motor  11  will be started via the drive IC  1  to let the CD on the disk rack  12  rotate at double speed. Then, when the CD rotates together with the disk rack  12 , the laser pickup  14  will read the music data in the CD and transmit them to both the system micro-processor  2  and the digital sound signal processor  5  via the high frequency amplifier  3  and the CD digital processor  4 . Subsequently, the data of the CD will be shown on a control faceplate  21  by means of the system microprocessor  2 , and the music data of the CD will be stored in a dynamic memory chip  51  by the digital sound signal processor  5 . 
     In broadcasting, action needed is input and transmitted in the system micro-processor  2  via the control faceplate  21 , and after the system micro-dealer  2  has received the order of action, a start and stop speeding control circuit  6  will control a motor drive circuit  61  and, via a direct drive motor  62 , also control starting, stopping and the rotating speed of a turntable  63 . 
     Further, according to the condition of the control faceplate  21  received by the system micro-dealer  2 , and based on the information of the turntable  63  controlled by the control faceplate  21  and detected by the photosensitive speeding detector  52 , the digital sound signal dealer  5  decides the music data to be stored in the dynamic memory chip  51 , arranging songs to be broadcast and regulating the rotating speed and direction of the CD, and, after the music data is converted into analog data by means of a digital/analog converter  7 , broadcasting the music via the filtered wave of a low pass filter  8 . 
     In addition, the turntable  63  of this invention can be provided with a light-reflective member  631  printed around its outer circumferential edge, as shown in FIG. 2, or bored with numerous minute holes  632  having light-reflective paper  633  pasted under its bottom, as shown in FIG.  3 . Then, the photosensitive speed detector  52  composed of two optical detectors will detect the rotating speed and direction of the CD by means of a A detector  521  and a B detector  522  forming a phase difference of 90 degrees between the signals, as shown in FIG.  4 . When the turntable  63  stops rotating, the A detector  521  or the B detector  522  will remain immovable because of no continual simulating signal detected, as shown in FIG.  5 . But, as soon as the turntable  63  rotates rightward, the A detector  521  detects the triggering signal, and at the same time, the system micro-processor  2  will calculate time difference between this signal and a next one and synchronously figure out the rotating speed of the turntable  63 , as shown in FIG.  6 . On the contrary, when the turntable  63  rotates leftward, the B detector  522  detects the triggering signal and notifies the system micro-processor  2  to calculate time difference between two triggering signals detected by the B detector  522 , and in the mean while, the rotating speed of the turntable  63  is figured out, as shown in FIG.  7 . 
     Furthermore, after the A detector  521  and the B detector  522  have calculated the rotating direction and speed of the turntable  63 , they will wait for a next signal to come and at the same time, judge which signal will reach the triggering position first so as to decide whether there is any need to alter the direction and speed of the turntable  63 ; Additionally, the turntable  63  itself can be detected its rotating speed and direction by applying a conventional detecting principle of an optical mouse. 
     As can be understood from the above description, this invention has the following advantages compared with the conventional one. 
     1. The music data of the CD stored in the dynamic memory is controlled by the rotating speed and direction of the turntable, impossible to result in any wear. 
     2. A variety of special music can be brought forth by applying the music data in a common CD, which is light and further capable to store a great many of music data, convenient in using and carrying. 
     3. The control faceplate can be utilized by a user for picking out songs and controlled to make a variety of special sound effects and capable to show an inputting condition and the information of the music data, possible to handle it with easiness. 
     4. The music data is transmitted to the digital sound signal processor at double speed and then stored in the dynamic memory ship so that the digital sound signal processor can in time broadcast the music data in the dynamic memory chip, no matter the disk on the turntable is rotating clockwise or counterclockwise or at different speed.