JP4250566B2 - Optical disk playback device - Google Patents

Description

  The present invention relates to an optical disc reproducing apparatus capable of storing audio data read from an optical disc in a memory and reproducing the audio data stored in the memory while changing a reading speed and a reading order.

  A DJ (Disc Jockey) that plays audio data by operating an audio playback device may perform special playback called scratch playback that generates sound effects such as a rubbing sound while playing back audio data. . When the DJ performs scratch reproduction using an analog record player, the DJ generates a rubbing sound by quickly rotating the analog record in the clockwise direction or the counterclockwise direction. In addition, there is an optical disk reproducing apparatus capable of performing special reproduction similar to scratch reproduction performed using this analog record player.

  This optical disk playback device includes a jog dial and a memory, stores audio data reproduced from an optical disk such as a CD (Compact Disc) in the memory, and reads out according to the rotation speed of the jog dial by rotating the jog dial clockwise. The audio data stored in the memory is read in the reading order of the speed and ascending address, and the read audio data is reproduced. Further, when the jog dial rotates counterclockwise, the audio data stored in the memory is read at the reading speed corresponding to the rotation speed of the jog dial and the reading order of the descending address, and the read audio data is reproduced. When the rotation of the jog dial is stopped, the optical disc playback apparatus reads audio data from the memory at a standard speed and an ascending address (hereinafter referred to as normal playback), and plays back the read audio data.

  For this reason, the optical disk reproducing apparatus generates a sound effect equivalent to a rubbing sound caused by an analog record when the jog dial rotates in a clockwise direction or a counterclockwise direction. In this way, when the audio data recorded on the CD is played back by the optical disc playback device, the DJ rotates the jog dial in the same way as an analog record, and performs special playback such as scratch playback similar to the analog record. (For example, refer to Patent Document 1).

JP 2001-31857 A

  The analog record is provided with a groove (hereinafter referred to as a trace groove) for guiding the record needle to a position before the recording start position of the first track (first tune) (the outermost peripheral portion of the analog record). . The record player starts normal reproduction of the audio signal of the first track when the analog record rotates 1 to 3 times and the record needle reaches the recording start position of the first track from the trace groove. Since the audio signal is not recorded in the trace groove provided in the analog record, the record player does not output the audio signal while the record needle moves in the trace groove.

  The DJ sometimes scratches and reproduces an audio signal for several seconds from the beginning of the first track recorded in the analog record using an analog record player. For example, after starting normal playback of the first track, the DJ rotates the analog record 1/4 in the clockwise direction, then rotates the analog record 1/2 in the counterclockwise direction, and then the analog record is Scratch regeneration may be performed in which a rotation operation of 1/2 rotation in the rotation direction is repeated. In other words, this scratch playback rotation operation is performed from the position of 1/4 rotation clockwise from the recording start position of the first track to the position of 1/4 rotation counterclockwise in the analog record. It is a rotation operation. FIG. 6 is a diagram for explaining the reproduction sound of scratch reproduction of the first track. FIG. 6A is a diagram for explaining the reproduction sound of scratch reproduction by an analog record player. FIG. 6B is a diagram for explaining the reproduced sound of scratch reproduction by the conventional optical disk reproducing apparatus.

  The OA section shown in FIG. 6 (a) is reproduced when the analog record rotates 1/4 in the clockwise direction after starting the normal reproduction of the audio signal of the first track recorded in the analog record. Indicates the playback sound. In the O-A section, the audio signal is normally reproduced from the beginning of the first track by the analog record player. The section A-B shows the playback sound that is played when the DJ rotates the analog record 1/4 in the counterclockwise direction. When the analog record is rotated 1/4 in the counterclockwise direction in the AB section, the audio signal of the first track is reproduced in the reverse order to the audio signal reproduced in the OA section by the analog record player, and the first track Up to the beginning of the audio signal.

  The section B-C shows the playback sound that is played back when the DJ further rotates the analog record 1/4 in the counterclockwise direction. In the section B-C, when the analog record is rotated 1/4 in the counterclockwise direction, the record needle moves in the trace groove, so that no audio signal is output from the analog record player (silent reproduction sound). The section C-D shows the playback sound that is played when the DJ rotates the analog record 1/4 from the counterclockwise direction to the clockwise direction. When the analog record is rotated 1/4 in the clockwise direction in the C-D section, the record needle moves in the trace groove moved in the B-C section, so that no audio signal is output by the analog record player. The section D-E shows the playback sound that is played when the DJ further rotates the analog record 1/4 in the clockwise direction. In the DE section, when the analog record is rotated 1/4 of the clockwise direction, the record needle moves from the trace groove to the recording start position of the first track, and an audio signal is sent from the beginning of the first track by the analog record player. Played.

  During scratch playback as shown in FIG. 6 (a), when DJ rotates the analog record from the counterclockwise direction to the clockwise direction at the point C, or when scratch playback ends, the analog record player In the section, the silent reproduction sound in the section B-C is reproduced, and the audio signal at the head of the first track is reproduced from the point D.

  Next, the DJ uses a conventional optical disc reproducing apparatus capable of performing special reproduction such as scratch reproduction by rotating the jog dial, and audio data for a few seconds from the beginning of the first track recorded on the optical disc. A case of scratch reproduction will be described. With reference to FIG. 6B, the reproduction sound of scratch reproduction by the conventional optical disk reproduction apparatus will be described.

The section oa shown in FIG. 6 (b) shows the reproduced sound that is reproduced after the normal reproduction of the audio data of the first track recorded on the optical disc is started. In the section oa, the audio data of the first track read from the optical disk by the conventional optical disk reproducing apparatus is stored in the memory, and the audio data read from the memory is normally reproduced. The ab section shows the playback sound that is played back when the DJ rotates the jog dial counterclockwise. In the section ab, when the jog dial is rotated counterclockwise in the section ab, the audio data reproduced in the section oa is read from the memory in descending order and the read audio data is played back.

  The section b-c shows the playback sound that is played back when the DJ further rotates the jog dial counterclockwise. Even after the first audio data of the first track is read from the memory at the descending address, when the jog dial is further rotated counterclockwise, the conventional optical disk reproducing apparatus stores the first track of the first track in the memory. Since the audio data to be read out in descending order is not stored subsequently, the reproduced sound in the bc section is silent.

  The section c-d shows the playback sound that is played when the DJ rotates the jog dial from the counterclockwise direction to the clockwise direction. In the cd section, when the DJ rotates the jog dial from the counterclockwise direction to the clockwise direction, the conventional optical disc playback apparatus starts reading the audio data from the beginning of the first track at the ascending address from the memory. Play back audio data.

  When performing the scratch reproduction as shown in FIG. 6B, when the DJ rotates the jog dial from the counterclockwise direction to the clockwise direction at the point c or when the scratch reproduction is finished, in the conventional optical disk reproducing apparatus, The audio data of the first track is reproduced from the beginning from the point c.

  Therefore, unlike the case of the above-described analog record player, the conventional optical disk playback apparatus does not generate a silent playback sound from the point c, but a playback sound of audio data from the head of the first track. For this reason, the conventional optical disk reproducing apparatus has a problem that it cannot generate a sound effect equivalent to the sound effect of scratch reproduction using an analog record player.

  The present invention has been made in order to solve the above-described problems. The sound effect of scratch reproduction by an audio signal for a few seconds from the beginning of the first track recorded in an analog record using an analog record player is similarly applied. An object of the present invention is to provide an optical disk reproducing apparatus that can be generated by the above operation.

In order to solve the above problems, the invention according to claim 1 of the present application includes a reading unit that reads audio data recorded on an optical disc, a storage unit that stores audio data read by the reading unit, and the storage unit. An optical disc comprising: an operation disk unit for instructing a reading speed and a reading order of audio data stored in the control unit; and a control unit for controlling reading of the audio data stored in the storage unit in response to an instruction from the operation disk unit In the playback device, the audio data read from the storage unit is detected at predetermined intervals and a detection signal is generated, and the audio data is read from the storage unit based on the detection signal generated by the time detection unit. A reading time calculation unit for calculating a reading time of audio data; and the control unit, wherein the reading time calculation unit reads in descending order. The audio data read out from the storage unit in order is calculated, and when the read time reaches a predetermined read time, silence audio data is controlled to be stored in the storage unit, and the storage unit After the head part of the audio data is read out in descending order, the silent audio data stored in the storage unit is controlled to be read out in descending order, and the silent audio data is read out in descending order. When reading is performed, when the reading order changes from descending to ascending order, the audio data stored in the storage unit is read from the head in ascending reading order after the silent audio data is read. It is characterized by that.

The invention according to claim 2 of the present application is the optical disk reproducing apparatus according to claim 1, wherein the control unit reads out and reads out from the operation disk unit when silent audio data is read out. When the order instruction stops, silent audio data is read from the storage unit in the ascending reading order, and then the audio data stored in the storage unit is read from the head.

  According to the present invention, there is provided an optical disc reproducing apparatus capable of generating a sound effect of scratch reproduction by an audio signal for several seconds from the beginning of a first track recorded in an analog record using an analog record player by a similar operation. Can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
An embodiment of the present invention includes a jog dial in an operation unit, and the reading speed and reading order of digital audio data reproduced from a CD and stored in a RAM (Random Access Memory) according to the rotation speed and rotation direction of the jog dial. It is a CD player that can be changed. FIG. 1 is a block diagram showing a configuration of a CD player according to an embodiment of the present invention. In FIG. 1, 1 is a turntable, 2 is a spindle motor, 3 is a servo control unit, 4 is an optical pickup, 5 is a reproduction amplifier, 6 is a signal processing unit, 7 is a memory control unit, 8 is a RAM, and 9 is a time detection. Reference numeral 10 denotes a DAC (Digital to Analog Converter), 11 denotes an output terminal, 12 denotes a control unit, 13 denotes a display unit, 14 denotes an operation unit, and 15 denotes a reading time calculation unit.

  The turntable 1 fixed to the spindle motor 2 fixes the CD. When there is an instruction to start reproduction from the operation unit 14, the servo control unit 3 controls to rotate the spindle motor 2 at a predetermined linear velocity. In addition, the servo control unit 3 controls a focus servo circuit and a tracking servo circuit (not shown) in order to correctly trace the laser beam from the optical pickup 4 in the CD pit row.

  Digital audio data read by the optical pickup 4 is shaped and amplified by a reproduction amplifier 5 and input to a signal processing unit 6. The signal processing unit 6 demodulates the digital audio data, extracts an error signal such as a focus error signal and a tracking error signal, and extracts a synchronization signal, and inputs the digital audio data to the memory control unit 7. The memory control unit 7 controls the input digital audio data to be input to the RAM 8. The RAM 8 is a ring buffer that stores the subsequent digital audio data from the head address when the input digital audio data is stored at the final address. The digital audio data stored in the RAM 8 is read out under the control of the memory control unit 7 and input to the time detection unit 9 provided in the memory control unit 7.

  The time detection unit 9 detects the digital audio data input from the RAM 8 in units of frames, generates a frame detection signal every time one frame is detected, and inputs the frame detection signal to the control unit 12. The time detection unit 9 generates a first frame detection signal when the digital audio data is read from the RAM 8 with the ascending order under the control of the memory control unit 7, and the digital audio data is read from the RAM 8 with the descending order address. If so, a second frame detection signal is generated. When the sampling frequency of the audio data recorded on the CD is 44.1 kHz, the digital audio data for one second is 44100 samples, and one frame (1/75 second) is 588 samples. The time detector 9 generates a first frame detection signal or a second frame detection signal each time 588 samples of digital audio data are detected. The DAC 10 converts the digital audio data input from the time detection unit 9 into an analog audio signal. The analog audio signal converted by the DAC 9 is output from the output terminal 11.

  The display unit 13 displays the playback time, track number, etc. of the currently playing track. The operation unit 14 includes a jog dial, a playback button, a playback stop button, a track search button, a fast forward button, a fast reverse button, and an eject button.

  FIG. 2 is a side sectional view of a jog dial provided in the operation unit 14 of the CD player according to the embodiment of the present invention. In FIG. 2, 21 is an operation disk part, 22 is a rotation shaft, 23 is a scale part, 24 is a bearing, 25 is a slit part, 26 is a rotation detection part, and 27 is a housing part of the CD player. In the CD player of the present embodiment, the operation disk portion 21 has a diameter of about 10 cm to 20 cm and is attached to the casing of the CD player.

  In FIG. 2, the operation disk part 21 has a rotating shaft 22 inserted in the center thereof and is fixed to the rotating shaft 22 with a screw or the like (not shown). The rotating shaft 22 is inserted into the bearing 24. The scale portion 23 has a rotation shaft 22 inserted in the center thereof, and is fixed to the rotation shaft 22 with screws or the like (not shown). For this reason, the jog dial 31 and the scale part 32 can rotate integrally via the rotating shaft 23. Moreover, in order to confirm the rotation state of the operation disk part 21 visually, the operation disk part 21 is provided with a mark indicating the rotation position.

  On the outer periphery of the scale portion 23, rectangular slit portions 25 are provided at equal intervals. When the material of the scale part 23 is a metal, the slit part 25 is a rectangular opening. However, the shape of the opening is not limited to a rectangle, and may be an appropriate shape. In the case where a transparent or translucent plastic or the like is used as the scale portion 23, the slit portion 25 is formed by printing.

  The rotation detection unit 26 detects the rotation state (rotation speed and rotation direction) of the scale unit 23 that rotates integrally with the operation disk unit 21. The rotation detection unit 26 includes an optical sensor a and an optical sensor b, and is fixed to the housing unit 27 so that the slit unit 25 provided in the scale unit 23 can be detected. When the rotation detection unit 26 detects the slit unit 25, the rotation detection unit 26 generates a pulse signal a and a pulse signal b having different phases (for example, a phase difference of 90 °) from the optical sensor a and the optical sensor b and outputs them to the control unit 12. . In this embodiment, the pulse signal a and the pulse signal b are used as rotation detection signals.

  When the control unit 12 is reproducing the digital audio data recorded on the CD, and the pulse signal a and the pulse signal b are not input from the rotation detection unit 26 (when the operation disk unit 21 is not rotated). Judged as normal playback. At this time, the control unit 12 controls the memory control unit 7 to read out the digital audio data stored in the RAM 8 at the standard speed and the ascending order address. The memory control unit 7 controls to read the digital audio data stored in the RAM 8 at a reading speed and reading order according to the control of the control unit 12.

  On the other hand, the control unit 12 is input when the operation disk unit 21 is rotated and the pulse signal a and the pulse signal b are input from the rotation detection unit 26 while reproducing the digital audio data recorded on the CD. Based on the pulse signal a and the pulse signal b, the rotational speed and direction of the operation disk portion 21 are determined. The control unit 12 determines the rotation speed of the operation disk unit 21 from the number of pulses of either the pulse signal a or the pulse signal b input from the rotation detection unit 26 at a predetermined time. Further, the control unit 12 determines the rotation direction of the operation disk unit 21 based on the phase difference between the pulse signal a and the pulse signal b input from the rotation detection unit 26. For example, when the phase difference between the pulse signal a and the pulse signal b is 90 °, when the operation disk portion 21 rotates in the clockwise direction, the pulse signal a has a phase difference of + 90 ° with respect to the pulse signal b. . When the operation disk portion 21 rotates counterclockwise, the pulse signal a has a phase difference of −90 ° with respect to the pulse signal b. The control unit 12 controls the memory control unit 7 to read the digital audio data from the RAM 8 at the read speed and read order corresponding to the determined rotation speed and rotation direction of the operation disk unit 21. The memory control unit 7 controls to read the digital audio data stored in the RAM 8 at a reading speed and reading order according to the control of the control unit 12.

  The control unit 12 includes a read time calculation unit 15. The read time calculation unit 15 calculates the read time by counting the first frame detection signal or the second frame detection signal input from the time detection unit 9 described above. This read time corresponds to the elapsed playback time from the beginning of the track of the digital audio data read from the RAM 8. The readout time calculation unit 15 increases the count number by 1 every time the first frame detection signal input from the time detection unit 9 is counted once, and increases the count number every time the second frame detection signal is counted once. Reduce by one. For example, when the count number of the first frame detection signal counted by the read time calculation unit 15 after starting the reproduction of the track is 1200, since the one second is 75 frames, the read time is 16 seconds 00 It becomes a frame (1200/75). Thereafter, when the readout time calculation unit 15 further counts the first frame detection signal 155 times continuously, the count number of the readout time calculation unit 15 is 1355 (= 1200 + 155), and the readout time is 18 seconds 05 frames ( 16 seconds 00 frames + 2 seconds 05 frames). Further, when the count number is 1200, if the readout time calculation unit 15 continuously counts the second frame detection signal 200 times, the count number of the readout time calculation unit 15 becomes 1000 (= 1200−200), The time is 13 seconds 25 frames (16 seconds 00 frames-2 seconds 50 frames).

  When scratch reproduction is performed using the CD player of this embodiment, the DJ repeats an operation of quickly rotating the operation disk portion 21 by hand in the clockwise direction or the counterclockwise direction. The control unit 12 determines the rotation speed and the rotation direction of the operation disk unit 21 from the pulse signal a and the pulse signal b input from the optical sensor a and the optical sensor b detected by the rotation detection unit 26. The control unit 12 controls the memory control unit 7 according to the determined rotation speed and rotation direction. The memory control unit 7 controls the reading speed and reading order of digital audio data stored in the RAM 8 (reading digital audio data with an ascending address or reading with a descending address). The digital audio data read from the RAM 8 is converted into an analog audio signal by the DAC 10 via the time detection unit 9 and output from the output terminal 11.

  3 and 4 are flowcharts for explaining the operation of scratch-reproducing audio data for several seconds from the beginning of the first track of the CD player of the embodiment of the present invention. FIG. 5 is a diagram for explaining the digital audio data stored in the RAM 8.

  Step 1 in FIG. 3 is a step in which when the audio data of the first track is normally reproduced, the control unit 12 determines whether or not the DJ rotates the operation disk unit 21 and the operation of scratch reproduction is performed. is there. When the scratch reproduction operation is performed, the process proceeds to Step 2.

  Step 2 is a step in which the control unit 12 determines whether or not the operation disk unit 21 has been rotated counterclockwise. The control unit 12 determines the rotation direction of the operation disk unit 21 rotated by the DJ from the pulse signal input from the rotation detection unit 26. When the operation disk part 21 is rotated counterclockwise, the process proceeds to step 3. When the operation disk part 21 is rotated in the clockwise direction, the process proceeds to Step 13.

  Step 3 is a step of performing control to read the digital audio data of the first track stored in the RAM 8 at the reading speed and descending address determined by the control unit 12. The digital audio data of the first track read from the RAM 8 at the read speed and descending address determined by the control unit 12 by the memory control unit 7 is converted into an analog audio signal by the DAC 10 via the time detection unit 9 and output terminal 11. Is output from.

  Step 4 is a step in which the control unit 12 determines whether or not the read time calculated by the read time calculation unit 15 has reached a predetermined read time (time from the head of the first track). When the predetermined time is reached, the process proceeds to step 5. In this embodiment, in step 5 to be described later, after the controller 12 determines that the predetermined readout time has come, the digital audio data at the head of the first track stored in the RAM 8 is read out in descending order address. In the meantime, silent digital audio data is stored in the RAM 8. Therefore, the predetermined readout time is set to be longer than the time required for the process of storing silent digital audio data in the RAM 8. When the digital audio data at the head of the first track is read from the RAM 8, the read time calculated by the read time calculation unit 15 is 0 minute 00 second 00 frame. For example, in this embodiment, the read time is predetermined. The readout time is set to 0 minute, 3 seconds, and 00 frames (that is, 3 seconds).

  FIG. 5A is a diagram showing the digital audio data stored in the RAM 8 in step 4. The O-A storage area of the RAM 8 shown in FIG. 5A is a storage area in which the digital audio data of the first track is stored. The storage area A-B is a storage area in which digital audio data of the second track is stored, and the storage area B-D is a storage area in which digital audio data is not stored.

  Step 5 is a step in which the control unit 12 performs control to store silent digital audio data in the RAM 8. When the controller 12 determines that the readout time calculated by the readout time calculator 15 in step 4 has reached a predetermined readout time, the controller 12 causes the memory controller 7 to store silent digital audio data in the RAM 8. Control. FIG. 5B shows the digital audio data stored in the RAM 8 in step 5.

  The control unit 12 performs control to store silent digital audio data in the RAM 8 so that silent digital audio data is read after the digital audio data at the head of the first track is read from the RAM 8 in descending address. . For this reason, the control unit 12 stores the address of the RAM 8 (the point O shown in FIG. 5A) where the digital audio data at the head of the first track is stored in the RAM 8, and an address before this address, for example, The storage area of the RAM 8 is designated so as to store silent digital audio data for 20 seconds. The memory control unit 7 can store silent digital audio data in the RAM 8 by controlling the storage area designated by the control unit 12 to be all zero data.

  In this embodiment, since the RAM 8 is a ring buffer, silent digital audio data is stored in the CD storage area of the RAM 8 as shown in FIG. When the digital audio data at the head of the first track is read from the RAM 8 in descending order at the start address of the point O shown in FIG. 5B, the digital audio data stored in the RAM 8 in descending order from the last address of the point D. Can be read out. The time of silent digital audio data stored in the RAM 8 may be set to an arbitrary time by the DJ.

  Step 6 is a step in which the controller 12 determines whether or not the digital audio data at the head of the first track has been read from the RAM 8 in descending order. If the digital audio data at the head of the first track has been read, the process proceeds to step 7. When the reading time calculation unit 15 calculates the reading time of 0 minute 00 seconds 00 frame, the control unit 12 determines that the digital audio data at the head of the first track has been read from the RAM 8 at the descending address.

  Step 7 is a step of reading silent digital audio data stored in the RAM 8 in descending order. When the DJ rotates the operation disk portion 21 counterclockwise, the control unit 12 reads the digital audio data at the head of the first track from the RAM 8 with the descending address, and the CD of the RAM 8 with the descending address. Control is performed to read silent digital audio data stored in the storage area.

  When the silent digital audio data stored in the RAM 8 is being read, the control unit 12 is read from the RAM 8 with information indicating that the silent digital audio data is being read on the display unit 13. Control is performed to display information indicating the remaining time of silent digital audio data. When the silent digital audio data track stored in the RAM 8 is set to the 0th track in step 5, the control unit 12 displays the track number 0 on the display unit 13 when reading the silent digital audio data from the RAM 8. To control. Alternatively, LEAD IN or the like may be displayed on the display unit 13.

  In step 5, for example, when silence digital audio data for 20 seconds is stored in the RAM 8, the control unit 12 stores the silence digital audio data stored in the final address at the point D shown in FIG. Is read out, the display unit 13 is controlled to display 0 minute 00 second 00 frame. When the silent digital audio data is read from the RAM 8 with the descending address, the control unit 12 controls the display unit 13 to display the incremented time for each frame. Then, when the silent digital audio data stored at the address of the point C shown in FIG. 5B is read from the RAM 8, the control unit 12 controls the display unit 13 to display 0 minute 20 seconds 00 frame. . When silent digital audio data is being read from the RAM 8 with ascending addresses, the control unit 12 controls the display unit 13 to display the decremented time for each frame.

  Step 8 is a step in which the control unit 12 determines whether or not the operation disk part 21 has been rotated from the counterclockwise direction to the clockwise direction. The control unit 12 determines the rotation direction of the operation disk unit 21 rotated by the DJ from the pulse signal input from the rotation detection unit 26. When the operation disk portion 21 is rotated from the counterclockwise direction to the clockwise direction, the process proceeds to Step 9. When the operation disk part 21 is rotated counterclockwise, the process proceeds to Step 10.

  Step 9 is a step proceeding to Step 16 shown in FIG.

  Step 10 is a step in which the control unit 12 determines whether or not the scratch reproduction has ended. When the rotation of the operation disk unit 21 stops and the input of the pulse signal from the rotation detection unit 26 stops, the control unit 12 determines that the DJ has finished the scratch reproduction. When the operation disk portion 21 is rotated counterclockwise and the scratch reproduction is finished, the process proceeds to step 11. If the scratch reproduction has not ended, the process proceeds to step 8.

  Step 11 is a step of reading out the silent digital audio data stored in the RAM 8 at the standard speed and the ascending address from the position where the scratch reproduction is finished.

  Step 12 is a step in which the digital audio data of the first track stored in the RAM 8 is normally reproduced from the beginning. The control unit 12 reads the silent digital audio data from the RAM 8 at the standard speed and the ascending address in step 11 and then the digital audio data at the head of the first track stored in the RAM 8 at the standard speed and the ascending address. Control reading.

  Step 13 controls to read the digital audio data of the first track stored in the RAM 8 at the read speed and ascending address determined by the control unit 12 when the operation disk unit 21 is rotated in the clockwise direction in Step 2. It is a step. The digital audio data of the first track read from the RAM 8 at the reading speed and the ascending address determined by the control unit 12 by the memory control unit 7 is converted into an analog audio signal by the DAC 10 via the time detection unit 9 and output terminal 11. Is output from.

  Step 14 is a step in which the controller 12 determines whether or not the scratch reproduction has ended. When the rotation of the operation disk unit 21 stops and the input of the pulse signal from the rotation detection unit 26 stops, the control unit 12 determines that the DJ has finished the scratch reproduction. When the scratch reproduction is completed, the process proceeds to step 15. If the scratch reproduction has not ended, the process proceeds to step 2.

  Step 15 is a step in which the control unit 12 controls normal reproduction. The control unit 12 performs control to read out the digital audio data of the first track stored in the RAM 8 at the standard speed and the ascending order address from the position where the scratch reproduction is finished in Step 14.

Step 16 shown in FIG. 4 is a step following step 9 shown in FIG.
Step 16 is a step of reading out the silent digital audio data stored in the RAM 8 in ascending order. When the operation disk unit 21 is rotated from the counterclockwise direction to the clockwise direction in Step 8, the control unit 12 performs control to change the reading order of the silent digital audio data stored in the RAM 8 from the descending address to the ascending address. To do.

  Step 17 is a step in which the control unit 12 determines whether or not the operation disk unit 21 has been rotated from the clockwise direction to the counterclockwise direction. The control unit 12 determines the rotation direction of the operation disk unit 21 rotated by the DJ from the pulse signal detected by the rotation detection unit 26. When the operation disk part 21 is rotated from the clockwise direction to the counterclockwise direction, the process proceeds to Step 18. If the operation disk portion 21 is rotated clockwise, the process proceeds to step 19.

  Step 18 is a step proceeding to Step 7 shown in FIG.

  Step 19 is a step in which the controller 12 determines whether or not the scratch reproduction has ended. When the rotation of the operation disk unit 21 stops and the input of the pulse signal from the rotation detection unit 26 stops, the control unit 12 determines that the DJ has finished the scratch reproduction. When the operation disk portion 21 is rotated in the clockwise direction and the scratch reproduction is finished, the process proceeds to Step 20. If the scratch reproduction has not ended, the process proceeds to step 21.

  Step 20 is a step proceeding to Step 11 shown in FIG.

  Step 21 is a step of reading the digital audio data at the head of the first track stored in the RAM 8 in ascending address. When silent digital audio data is read from the RAM 8 at the ascending address, the control unit 12 controls to read out the digital audio data at the head of the first track stored in the RAM 8 at the ascending address.

  In the embodiment described above, the control unit 12 performs control to store silent digital audio data in the RAM 8 when the read time calculated by the read time calculation unit 15 reaches a predetermined read time. When reading of the recorded audio data is started, the RAM 8 may be controlled to store silent digital audio data. Alternatively, when the power source of the CD player of the present embodiment is turned on, the control unit 12 may perform control to store silent digital audio data in the RAM 8.

  As described above, in the CD player of this embodiment, the operation disk portion 21 is rotated counterclockwise, and the silent digital audio is read before the digital audio data at the head of the first track is read from the RAM 8 with the descending address. Data is stored in the RAM 8. This silent digital audio data is stored in the RAM 8 so as to be read out from the RAM 8 in descending order following the reading of the digital audio data at the head of the first track. When the CD player of this embodiment reads silent digital audio data stored in the RAM 8 in descending address, when the operation disk portion 21 is rotated from the counterclockwise direction to the clockwise direction, or when the scratch reproduction ends. The silent digital audio data stored in the RAM 8 is read out in ascending order.

  For this reason, the CD player according to the present embodiment rotates the operation disk portion 21 in the same manner as the analog record, thereby converting the audio signal for several seconds from the beginning of the first track recorded in the analog record to the sound effect of scratch reproduction. Sound effects equivalent to those can be generated.

  In this embodiment, the scratch reproduction of the audio data of the first track recorded on the CD has been described. However, the present invention is applied not only to the first track but also to the scratch reproduction of the audio data of all tracks recorded on the CD. can do.

1 is a block diagram showing a configuration of a CD player that is an embodiment of the present invention. The figure which shows the structure of the jog dial with which the CD player which is an Example of this invention is provided. The flowchart explaining the operation | movement of scratch reproduction of the 1st track | truck of the CD player which is an Example of this invention. The flowchart explaining the operation | movement of scratch reproduction of the 1st track | truck of the CD player which is an Example of this invention. The figure explaining the digital audio data memorize | stored in RAM8. The figure explaining the reproduction sound of scratch reproduction of the 1st track of the conventional optical disk reproducing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Turntable, 2 ... Spindle motor, 3 ... Servo control part, 4 ... Optical pick-up, 5 ... Reproduction amplifier, 6 ... Signal processing part, 7 ... Memory control part, 8 ... RAM, 9 ... Time detection part, 10 ... DAC, 11 ... output terminal, 12 ... control unit, 13 ... display unit, 14 ... operation unit, 15 ... reading time calculation unit, 21 ... operation disk unit, 22 ... rotating shaft, 23 ... scale unit, 24 ... bearing, 25 ... Slit part, 26 ... Rotation detection part, 27 ... CD player casing

Claims (2)

A reading unit for reading audio data recorded on the optical disc;
A storage unit for storing audio data read by the reading unit;
An operation disk unit for instructing the reading speed and reading order of the audio data stored in the storage unit;
In an optical disk playback device comprising a control unit that controls to read out audio data stored in the storage unit in accordance with an instruction from the operation disk unit,
A time detection unit that detects audio data read from the storage unit every predetermined time and generates a detection signal;
A read time calculation unit that calculates a read time of audio data read from the storage unit based on a detection signal generated by the time detection unit;
The control unit calculates the read time of the audio data read from the storage unit in the reading order in descending order by the read time calculating unit, and when the read time reaches a predetermined read time, the audio data of silence Are stored in the storage unit, and after the head portion of the audio data is read out from the storage unit in the descending order, the silent audio data stored in the storage unit is read out in the descending order. When silent audio data is read out in descending order and read out in descending order, the audio data stored in the storage unit is read after the silent audio data is read out. An optical disc reproducing apparatus that controls to read out images in ascending order from the top.   The optical disk reproducing apparatus according to claim 1,
  When silent audio data is being read out, the control unit reads silent audio data from the storage unit in an ascending order when reading instructions from the operation disk unit and reading order are stopped. After that, the optical disc reproducing apparatus controls to read the audio data stored in the storage unit from the head.

Images