JP2005332440A - Optical disk reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk reproducing device capable of generating the sound effect of scratch reproduction by au audio signal for several seconds from the leading part of a first track recorded on an analog record by using an analog record player with a similar operation. <P>SOLUTION: The optical disk reproducing device comprises; a rotation detecting section which generates a rotation detection signal by detecting a rotation speed and direction of an operating disk section; a counter section which increments the count number of the rotation detection signal from an initial value when the leading part of the audio data is read out of a memory section in descending read order; a clock section which converts the count number of the counter section to time and clocks the time; and a controller which controls to stop the read of the audio data from the memory section while the counter section increments the count number of the rotation detection signal and while the clock section clocks the time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 by 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.

  When the scratch reproduction as shown in FIG. 6 (a) is performed, when the DJ ends the scratch reproduction at the point C and starts the normal reproduction, the analog record player performs the silent sound in the BC section in the CD section. Play the playback sound and perform normal playback of the audio signal at the beginning of the first track from 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 o-a 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 o-a, 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 section a-b shows the playback sound that is played when the DJ rotates the jog dial counterclockwise. In the section a-b, when the jog dial is rotated counterclockwise, the conventional optical disc playback apparatus reads the audio data reproduced in the section o-a from the memory in the descending order address and reproduces the read audio data.

  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 the scratch reproduction as shown in FIG. 6 (b) is performed, when the DJ finishes the scratch reproduction at the point c, in the conventional optical disk reproducing apparatus, the rotation of the jog dial is stopped. Start normal playback of audio data from the beginning of the track.

  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, a rotation detection unit that detects a rotation speed and a rotation direction of the operation disk unit and generates a rotation detection signal, and a head detection unit that detects that the head of the audio data is read from the storage unit , Audio data is read from the storage unit in descending order by the control of the control unit, and the head detection unit A counter unit that counts the number of pulses of the rotation detection signal in an increasing direction from the initial value when the head of the data is detected, and the counter unit counts until the rotation detection unit stops generating the rotation detection signal A count unit that converts the count number into time and counts the converted time from when the rotation detection unit stops generating the rotation detection signal, and the control unit includes the counter unit configured to rotate the counter unit. Control is performed to stop reading of audio data from the storage unit while counting the number of pulses of the detection signal in the direction of increasing and counting the time converted by the timing unit.

  Further, the invention according to claim 2 of the present application is the optical disc reproducing apparatus according to claim 1, wherein the control unit receives audio from the storage unit when the time counted by the time measuring unit reaches the converted time. Control is performed to read from the head of the data.

  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 frame detection. , 10 is a DAC (Digital to Analog Converter), 11 is an output terminal, 12 is a control unit, 13 is a display unit, 14 is an operation unit, 15 is a counter unit, 16 is a head detection unit, and 17 is a timing 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 stores the input digital audio data. 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 frame detection unit 9 provided in the memory control unit 7.

  The frame 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 frame detection unit 9 generates a first frame detection signal when the digital audio data is read from the RAM 8 with the ascending address under the control of the memory control unit 7, and the digital audio data is read from the RAM 8 with the descending 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 frame detection unit 9 generates a first frame detection signal or a second frame detection signal every time 588 samples of digital audio data are detected. The DAC 10 converts the digital audio data input from the frame 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 a screw 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 the control unit 12 and the counter unit. 15 is output. In this embodiment, the pulse signal a and the pulse signal b are used as rotation detection signals. The counter unit 15 increases (increments) the number of pulses of the pulse signal a or the pulse signal b input from the optical sensor a or the optical sensor b of the rotation detection unit 26 by one by the control of the control unit 12 or decreases by one. Count in the direction of decrement.

  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 calculates the read time by counting the first frame detection signal or the second frame detection signal input from the frame 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 control unit 12 increases the count number every time the first frame detection signal input from the frame detection unit 9 is counted once, and decreases the count number by 1 every time the second frame detection signal is counted once. . For example, when the count of the first frame detection signal counted by the control unit 12 after starting the reproduction of the track is 1200, since the one second is 75 frames, the reading time is 16 seconds 00 frames ( 1200/75). Thereafter, when the control unit 12 further counts the first frame detection signal continuously 155 times, the count number of the control unit 12 is 1355 (= 1200 + 155), and the reading time is 18 seconds 05 frames (16 seconds 00 frames). +2 seconds 05 frames). When the count number is 1200 and the control unit 12 continuously counts the second frame detection signal 200 times, the count number of the control unit 12 is 1000 (= 1200−200), and the reading time is 13 25 frames per second (16 seconds 00 frames-2 seconds 50 frames).

  The control unit 12 includes a head detection unit 16 and a timer unit 17. The head detection unit 16 detects that the head part of the digital audio data is read from the RAM 8 when the read time calculated by the control unit 12 reaches 0 minute 00 second 00 frame. The time counting unit 17 converts the count number obtained by counting the number of pulses of the pulse signal a or the pulse signal b into time after the head detecting unit 16 detects the head of the digital audio data, and measures the time. To do. As will be described later, when the timer unit 17 reads one frame of digital audio data from the RAM 8 with one pulse of the pulse signal generated by the rotation detector 26, the timer unit 17 converts one count of the counter unit 15 into one frame. For example, when the count number of the counter unit 15 is 500, the time measuring unit 17 converts it to 500 frames (6 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 rotational speed and 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 of 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 frame detection unit 9 and output from the output terminal 11.

  FIGS. 3, 4 and 5 are flowcharts for explaining the operation of scratch-reproducing audio data for a few seconds from the beginning of the first track of the CD player according to the embodiment of the present invention. In the CD player of this embodiment, when the operation disk unit 21 makes one rotation, the rotation detection unit 26 generates a pulse signal of 135 pulses, and digital audio data for one frame stored in the RAM 8 with one pulse of the pulse signal. Will be described as reading.

  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 11.

  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 frame detection unit 9 and output terminal 11. Is output from.

  Step 4 is a step in which the head detector 16 detects that the digital audio data at the head of the first track has been read from the RAM 8. Since the digital audio data is read from the RAM 8 with the descending address, the frame detection unit 9 generates a second frame detection signal and inputs it to the control unit 12. The control unit 12 calculates the read time by counting the input second frame detection signal. Since this reading time corresponds to the elapsed playback time from the beginning of the track of the digital audio data read from the RAM 8, the control unit 12 calculates the digital audio data at the beginning of the first track from the RAM 8. The read time is 0 minute 00 second 00 frame. Therefore, the head detection unit 16 detects that the digital audio data at the head of the first track has been read from the RAM 8 when the calculated read time reaches 0 minute 00 second 00 frame. If the head detector 16 detects that the digital audio data at the head of the first track has been read from the RAM 8, the process proceeds to step 5. If the head detector 16 does not detect that the digital audio data at the head of the first track has been read from the RAM 8, the process proceeds to step 7.

  Step 5 is a step of determining that the control unit 12 performs control to stop reading of the digital audio data from the RAM 8. When the head detection unit 16 detects that the digital audio data at the head of the first track has been read from the RAM 8, the control unit 12 controls to stop reading the digital audio data from the RAM 8. At this time, the analog audio signal output from the output terminal 11 becomes silent from the analog audio signal of the first track.

  Step 6 is a step in which the control unit 12 controls the counter unit 15 to increment the pulse number of the pulse signal from the initial value. When the head detection unit 16 detects in step 4 that the digital audio data at the head of the first track has been read from the RAM 8, the counter unit 15 receives a pulse signal pulse from the rotation detection unit 26. The count number is incremented from an initial value (for example, zero).

  Step 7 is a step in which the control unit 12 determines whether or not the operation disk unit 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 8. If the operation disk portion 21 is rotated counterclockwise, the process proceeds to step 9.

  Step 8 is a step proceeding to Step 14 shown in FIG.

  Step 9 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 in the counterclockwise direction and the scratch reproduction is finished, the process proceeds to Step 10. If the scratch reproduction has not ended, the process proceeds to step 4.

  Step 10 is a step proceeding to Step 24 shown in FIG.

  Step 11 is a step of performing control to read the digital audio data of the first track from the RAM 8 at the read speed and the ascending address determined by the control unit 12 when the operation disk unit 21 is rotated in the clockwise direction in Step 2. . The digital audio data of the first track read from the RAM 8 at the read 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 frame detection unit 9 and output terminal 11. Is output from.

  Step 12 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 scratch reproduction is completed, the process proceeds to step 13. If the scratch reproduction has not ended, the process proceeds to step 2.

  Step 13 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 address from the position where the scratch reproduction is finished in Step 12.

Step 14 shown in FIG. 4 is a step following step 8 shown in FIG.
Step 14 is a step in which the control unit 12 determines whether or not the count number of the counter unit 15 is an initial value. When the count number of the counter unit 15 is the initial value, the process proceeds to step 15. If the count is not the initial value, the process proceeds to step 16. Here, in the CD player of this embodiment, when the count number of the counter unit 15 is an initial value, the DJ is step 7 before the digital audio data at the head of the first track is read from the RAM 8 in descending order. In this case, the operation disk portion 21 is rotated from the counterclockwise direction to the clockwise direction. In the CD player of this embodiment, if the count number of the counter unit 15 is not the initial value, the digital audio data at the head of the first track is read from the RAM 8 with the descending address, and then DJ is performed in step 7. This is a case where the operation disk 30 is rotated from the counterclockwise direction to the clockwise direction.

  Step 15 is a step proceeding to Step 11 shown in FIG.

  Step 16 is a step in which the control unit 12 controls the counter unit 15 to decrement the number of pulses of the pulse signal. When the DJ rotates the operation disk unit 21 in the clockwise direction, the counter unit 15 decrements from the incremented count every time the pulse of the pulse signal is input from the rotation detection unit 26.

  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 input from 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 in which the control unit 12 controls the counter unit 15 to increment the number of pulses of the pulse signal. In step 17, when the DJ rotates the operation disk portion 21 in the counterclockwise direction, the digital audio data at the head of the first track is not read from the RAM 8 with the ascending address, so the counter portion 15 detects the rotation. Each time the pulse of the pulse signal is input from the unit 26, the count number is incremented.

  Step 19 is a step in which the control unit 12 determines whether or not the count number of the counter unit 15 has reached an initial value. When the count number of the counter unit 15 reaches the initial value, the process proceeds to step 20. If the count number does not reach the initial value, the process proceeds to step 16.

  Step 20 is a step in which the control unit 12 controls to read out the digital audio data at the head of the first track from the RAM 8 in ascending order. When the count value of the counter unit 15 reaches the initial value, the control unit 12 controls to read the digital audio data of the first track from the RAM 8 from the RAM 8 in ascending order.

  Step 21 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 scratch reproduction is completed, the process proceeds to step 23. If the scratch reproduction has not ended, the process proceeds to step 22.

  Step 22 is a step proceeding to Step 2 shown in FIG.

  Step 23 is a step in which the control unit 12 controls normal reproduction. The control unit 12 controls to read out the digital audio data of the first track stored in the RAM 8 at the standard speed and the ascending address from the position where the scratch reproduction is finished in Step 21.

  In the CD player of the present embodiment described with reference to the flowcharts shown in FIGS. 3 and 4, the DJ rotates the operation disk portion 21 counterclockwise, and the digital audio at the head of the first track from the RAM 8 in descending order address. After the data is read, when the DJ rotates the operation disk unit 21 in the clockwise direction, the counter unit 15 decrements the incremented count to the initial value (that is, the operation disk unit 21 rotates in the clockwise direction). Until the rotation amount rotated counterclockwise reaches the rotation amount rotated counterclockwise), the digital audio data at the head of the first track is not read from the RAM 8 with the ascending address. For this reason, the CD player of the present embodiment reads the digital audio data at the head of the first track from the RAM 8 in descending order (step 4) until the count number of the counter unit 15 returns to the initial value (step 4). During step 19), the analog audio signal output from the output terminal 11 is silent.

  Therefore, the CD player of the present embodiment rotates the operation disk portion 21 in the same manner as the analog record, and outputs an audio signal for several seconds from the beginning of the first track recorded on the analog record using the analog record player. A sound effect equivalent to the sound effect of scratch reproduction can be generated.

Step 24 shown in FIG. 5 is a step following step 10 shown in FIG.
Step 24 is a step in which the control unit 12 determines whether or not the count number of the counter unit 15 is an initial value. When the count number of the counter unit 15 is the initial value, the process proceeds to step 25. If the count is not the initial value, the process proceeds to step 26. Here, in the CD player of this embodiment, when the count number of the counter unit 15 is the initial value, the DJ performs scratch playback before the digital audio data at the head of the first track is read from the RAM 8 in descending order address. Is the case where Also, in the CD player of this embodiment, when the count number of the counter unit 15 is not the initial value, after the digital audio data at the head of the first track is read from the RAM 8 with the descending order address, the DJ operates the operation disk part. This is a case where the scratch reproduction in which 21 is rotated counterclockwise is completed.

Step 25 is a step in which the control unit 12 controls normal reproduction.
The control unit 12 controls to read out the digital audio data of the first track stored in the RAM 8 at the standard speed and the ascending address from the position where the scratch reproduction is finished in Step 9.

  In step 26, the count number counted by the counter unit 15 after the start detection unit 16 detects the start of the digital audio data of the first track in step 4 until the end of the scratch reproduction in step 9 is obtained. This is a step in which the timer 17 converts the time. As described above, the time measuring unit 17 reads one frame of digital audio data from the RAM 8 with one pulse of the pulse signal generated from the rotation detecting unit 26, so that one count of the counter unit 15 is converted into one frame.

  Step 27 is a step in which the time measuring unit 17 starts measuring time.

  Step 28 is a step in which the control unit 12 determines whether or not the time measured by the time measuring unit 17 has reached the converted time. When the time measured by the time measuring unit 17 reaches the converted time, the process proceeds to step 29.

  In step 29, the control unit 12 controls to read out the digital audio data at the head of the first track from the RAM 8 in ascending order. When the time counted by the time measuring unit 17 reaches the converted time, the control unit 12 controls to read the digital audio data of the first track from the RAM 8 from the RAM 8 in ascending order.

  Step 30 is a step in which the control unit 12 controls normal reproduction. The control unit 12 controls the memory control unit 7 so as to read the digital audio data of the first track from the RAM 8 from the head portion at the standard speed and the ascending order address. The memory control unit 7 controls to read the digital audio data of the first track from the RAM 8 from the head part at the standard speed and the ascending order address.

  In the CD player of the present embodiment described with reference to the flowcharts shown in FIGS. 3 and 5, the DJ rotates the operation disk portion 21 counterclockwise, and the digital audio at the head of the first track from the RAM 8 in descending order address. When the scratch reproduction is finished after the data is read, the digital audio data at the head of the first track is not read from the RAM 8 in ascending order until the time counted by the time measuring unit 17 reaches the converted time. For this reason, the CD player of this embodiment reaches the time converted by the time measured by the time measuring unit 17 after the digital audio data at the head of the first track is read from the RAM 8 in descending order (step 4). (Step 28), the analog audio signal output from the output terminal 11 is silent.

  Therefore, the CD player of 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 as a sound effect for scratch reproduction. Equivalent sound effects 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 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 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 ... Frame detection part, 10 ... DAC, 11 ... output terminal, 12 ... control unit, 13 ... display unit, 14 ... operation unit, 15 ... counter unit, 16 ... head detection unit, 17 ... timing unit, 21 ... operation disk unit, 22 ... rotating shaft, 23 ... Scale part, 24 ... Bearing, 25 ... Slit part, 26 ... Rotation detection part, 27 ... Housing part of CD player

Claims (2)

A reading unit that reads audio data recorded on the optical disc, a storage unit that stores the audio data read by the reading unit, and an operation disk unit that instructs the reading speed and reading order of the audio data stored in the storage unit; An optical disc playback apparatus 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 rotation detection unit that detects a rotation speed and a rotation direction of the operation disk unit to generate a rotation detection signal; a head detection unit that detects that a head of audio data is read from the storage unit; and the control unit The counter unit counts the number of pulses of the rotation detection signal in an increasing direction from the initial value when the audio data is read out from the storage unit in descending order by the control of the storage unit and the head detection unit detects the head of the audio data. And from the time when the rotation detection unit stops generating the rotation detection signal, and the count value counted by the counter unit until the rotation detection unit stops generating the rotation detection signal is converted into time. A time measuring unit for measuring the converted time,
The control unit reads audio data from the storage unit while the counter unit is counting the number of pulses of the rotation detection signal in the increasing direction and while the time counting unit is measuring the time converted. An optical disk reproducing apparatus characterized by performing control to stop. The optical disk reproducing apparatus according to claim 1, wherein
The optical disk reproducing apparatus according to claim 1, wherein when the time counted by the time measuring unit reaches the converted time, the control unit performs control to read from the head of audio data from the storage unit.

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