JP2005108289A - Optical disk reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk reproducing device which can return to the audio data at the point when the first scratch reproduction ends, and reproduce the same sound effects in the second scratch reproduction as those reproduced in the first scratch reproduction. <P>SOLUTION: The controller stores the position where the audio data are read from the memory when the operating section finishes a first operation. When the operation section starts a second operation, it controls to read the audio data stored in the memory based on the number of revolution detection signals counted by the counter from the finish of the first operation till the start of the second operation by the operating section and the above read time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

  A disc jockey (DJ, Disc Jockey) that operates an optical disc playback apparatus to play back audio data is playing back audio data recorded on an optical disc such as an analog record or a compact disc (CD). In some cases, special reproduction called scratch reproduction for generating sound effects such as rubbing sound is performed. 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. There is also a DJ CD player that can perform special reproduction similar to scratch reproduction by this analog record player. This DJ CD player includes a jog dial and memory, stores audio data reproduced from the CD in the memory, and reads the audio data stored in the memory by rotating the jog dial clockwise or counterclockwise. Controls the speed and reading order to generate sound effects equivalent to rubbing sounds from analog records. In this way, when the DJ is playing audio data recorded on a CD with a DJ CD player, the jog dial is rotated in the same way as an analog record, and special playback such as scratch playback similar to an analog record. It can be performed. (For example, refer to Patent Document 1.)

  In addition, when the applicant starts playing the audio data recorded on the CD, the jog dial part (operation disk part and disk part) rotates at a predetermined speed, and the operation disk part and the disk part rotate at the same rotational speed. When rotating in the rotation direction, the audio data is played back at the standard speed, and the operation disk part is rotated in the forward direction or the reverse direction independently of the disk part, so that the scratch reproduction similar to the analog record player is performed. Previously proposed an optical disk reproducing apparatus capable of performing special reproduction such as Japanese Patent Application No. 2002-153514.

FIG. 6 is a diagram showing a side cross section of the jog dial portion of the optical disc apparatus described in the patent application drawing of Japanese Patent Application No. 2002-153514.
When the reproduction of the audio data is started, the motor 51 rotates at a predetermined speed. When the motor 51 rotates and the DJ does not touch the operation disk part 53, the disk part 52 and the operation disk part 53 rotate at the same speed. Further, when the DJ operates the operation disk part 53, the operation disk part 53 is rotated independently of the disk part 52 by the slip mat 58. The first sensor unit 54 detects an opening of the slit unit 55 provided in the disk unit 52 and generates a first pulse signal corresponding to the rotation state (rotational speed and direction) of the disk unit 52, not shown. Input to the control unit. The second sensor unit 56 detects the opening of the slit unit 57 provided in the operation disk unit 53 and generates and controls a second pulse signal corresponding to the rotation state (rotation speed and direction) of the operation disk unit 53. Enter in the department. A control part discriminate | determines whether the disk part 52 and the operation disk part 53 are the same rotation states from the input 1st pulse signal and 2nd pulse signal. When it is determined that the disk unit 52 and the operation disk unit 53 are in the same rotation state, the control unit controls to read the audio data at a standard speed from the memory in which the audio data is stored.

  The DJ performs scratch reproduction by rotating the operating disc portion 53 in the clockwise direction or the counterclockwise direction. When the control unit determines that the disk unit 52 and the operation disk unit 53 are not in the same rotation state, the control unit determines the rotation speed and rotation direction of the operation disk unit 53 from the input second pulse signal, and determines the determined rotation speed and rotation. According to the direction, the reading speed and reading order of audio data stored in the memory are controlled (reading audio data with ascending or descending addresses).

  For example, when the DJ CD player including the disk unit 52 and the operation disk unit 53 includes the motor 51 that rotates 30 times per minute, when the DJ rotates the operation disk unit 53 once, the control unit Control is performed to read out audio data for 2 seconds from the memory at the determined rotational speed and rotational direction of the operation disk portion 53.

  The DJ operates the operation disk unit 53 of the DJ CD player to perform the first scratch reproduction, and then reproduces the audio data at the standard speed, and further reproduces the first data after the reproduction at the standard speed. When returning to the audio data at the time when the scratch reproduction is completed, during the reproduction at the standard speed, the number of rotations of the operation disk unit 53 from the first scratch reproduction end position (rotation position) of the operation disk unit 53 is counted, The operation disk unit 53 is rotated in the reverse direction (the rotation direction opposite to the rotation direction of the motor 51) by the number of rotations counted from the position where the reproduction at the reproduction speed is completed (the rotation position). For example, when audio data is reproduced for 10 seconds at the standard speed after the completion of the first scratch reproduction, the operation disk part 53 rotates five times, so that the DJ operates the operation disk part in the reverse direction from the position where the reproduction at the standard reproduction speed is completed. By rotating 53 to 5 times, it is possible to return to the position where the first scratch reproduction is completed. For this reason, the DJ can output the same sound effect as the first scratch reproduction by the second scratch reproduction.

  When the disk unit 52 and the operation disk unit 53 are driven to rotate by using an inexpensive motor with low rotation accuracy for a DJ CD player, the rotation speed of the disk unit 52 and the operation disk unit 53 changes depending on the rotation accuracy of the motor 51. Deviations occur in the rotational speed. This DJ CD player uses a motor with low rotational accuracy in order to read out the audio data stored in the memory at a standard speed with a reference clock when the rotating state of the disk part 52 and the operating disk part 53 match. This will not affect normal speed playback. However, when such a motor with low rotational accuracy is used, there are the following problems. For example, when audio data is reproduced at a standard speed for 10 seconds after the first scratch reproduction is completed, if the rotation accuracy of the motor is low, the rotation speed of the operation disk portion 53 is increased or decreased from 5 rotations (for example, 4.5 And 5.5.).

  For example, when the number of rotations of the operation disk unit 53 is 4.5, the DJ moves the operation disk unit 53 in the reverse direction to perform the operation of returning to the audio data at the time when the first scratch reproduction is completed. 5 turns. When the operation disk unit 53 is rotated once in the reverse direction, the control unit controls to read out the audio data of 2 seconds from the memory with the descending address. Therefore, when the operation disk unit 53 is rotated 4.5 times in the reverse direction, It controls to read out the audio data for 9 seconds from the memory in descending order address. Therefore, the DJ CD player starts playback from the audio data of 9 seconds before and plays back audio data different from the audio data (audio data of 10 seconds before) at the time when the first scratch playback is finished. .

Japanese Patent Laid-Open No. 11-86446

  The present invention further improves the optical disk reproducing apparatus previously proposed by the applicant, and the first scratch can be obtained even when the rotational speed of the disk part and the operating disk part has a deviation due to low rotational accuracy of the motor. An object of the present invention is to provide an optical disk reproducing apparatus capable of returning to audio data at the time when reproduction is completed and outputting the same sound effect as in the first scratch reproduction in the second scratch reproduction.

  In order to solve the above problems, the invention according to claim 1 of the present application is directed to a reproducing unit that reproduces audio data recorded on an optical disc, a storage unit that stores audio data reproduced by the reproducing unit, and the storage An optical disc playback apparatus comprising: an operation unit that instructs a read speed and a read order of audio data stored in a unit; and a control unit that controls to read audio data stored in the storage unit according to an instruction from the operation unit The operation unit includes an operation disk unit and a disk unit on which the operation disk unit is placed, and rotates by detecting a rotation speed and a rotation direction of the drive unit that rotates the disk unit, and the operation disk unit. A rotation detection unit that generates a detection signal; and a counter unit that counts the number of rotation detection signals generated by the rotation detection unit. When the first operation is completed, the audio data read time read from the storage unit is stored, and when the second operation by the operation unit is started, the counter unit terminates the first operation. The audio data stored in the storage unit is controlled based on the number of rotation detection signals counted during the period from the start to the second operation start and the readout time.

  According to a second aspect of the present invention, in the optical disk reproducing apparatus according to the first aspect, a frame detection unit that detects the audio data read from the storage unit for each frame and generates a frame detection signal. Further, the reading time is a time calculated from the frame detection signal by the control unit.

  According to a third aspect of the present invention, in the optical disk reproducing device according to the second aspect, the control unit calculates a first reproduction time from the number of rotation detection signals, and a second operation by the operation unit. Is started, audio data stored in the storage unit is controlled to be read from a second reproduction time obtained by adding the first reproduction time to the reading time.

  According to the present invention, even when a deviation occurs in the rotational speeds of the disk part and the operation disk part, it is possible to return to the audio data at the time when the first scratch reproduction is completed, and the same effect as the first scratch reproduction is achieved. Sound can be output in the second scratch reproduction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an optical disk reproducing apparatus 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, and 8 is a RAM (Random Access Memory). , 9 is a frame detection unit, 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, and 16 is a reading time storage unit. Show. An optical disk reproducing apparatus according to an embodiment of the present invention includes a jog dial unit as a reading instruction unit in the operation unit 14, and is reproduced from a CD and stored in the RAM 8 according to the rotation speed and direction of the jog dial unit. This is a DJ CD player capable of changing the data reading speed and reading order.

  The turntable 1 fixed to the spindle motor 2 fixes the CD. When an instruction to start reproduction is input from the operation unit 14, the servo control unit 3 performs control to drive the spindle motor 2 to rotate 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 unit, 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 diagram showing a side cross section of the jog dial portion provided in the operation portion 14 of the CD player according to one embodiment of the present invention. In FIG. 2, 21 is a panel, 22 is a motor, 23 is a rotating shaft, 24 is a pulley, 25 is a pulley section, 26 is a belt, 27 is a disk section, 28 is a pulley section, 29 is a seat section, and 30 is an operation disk section. , 31 is a holding unit, 32 is a rotation axis, 33 is a second optical sensor unit, 34 is a scale holding unit, 35 is a scale unit, 36 is a first optical sensor unit, 37 is a scale holding unit, 38 is a scale unit, 39 Is a washer, 40 is a screw, 41 is a bearing, 42 is an E-ring, 43 is a convex portion, 44 is a concave portion, 45 is a bearing, and 46 is a bearing. In the CD player of the present embodiment, the operation disk portion 30 is a disk having a size equivalent to that of an analog record having a diameter of 10 cm to 30 cm, and the jog dial portion is attached to the upper surface of the CD player.

  In the CD player of this embodiment, the motor 22 is attached to the panel 21 with screws 40. In the panel 21, the bearing 41 is formed by insert molding, that is, integral molding (hereinafter the same). A pulley 24 is attached to the rotating shaft 23 of the motor 22. A belt 26 is hung on a pulley portion 25 of a pulley 24 and a pulley portion 28 of a disk portion 27 attached to a rotating shaft 23 of the motor 22.

  The scale part 38 for detecting the rotation state of the disk part 27 is fixed to the scale holding part 37 attached to the back surface of the disk part 27 with screws 40. The first photosensor unit 36 is fixed to the panel 21 with screws 40. Further, the scale holding part 37 is formed by integral molding with the bearing 45. The scale holding portion 37 is inserted into the bearing 41 of the panel 21 and is held by the E ring 42. On the back surface of the disk part 27, the pulley part 28 described above is provided in an annular shape.

  A bearing 46 is formed by integral molding on the rotating shaft 32 that is a holding shaft of the operation disk portion 30. The rotating shaft 32 is inserted into and held by a bearing 41 of the panel 21 via a washer 39.

  The scale unit 35 for detecting the rotation state of the operation disk unit 30 is fixed to the scale holding unit 34 with screws 40. The scale holding part 34 is inserted into the rotary shaft 32 via a washer 39. The second photosensor unit 33 is fixed to the panel 21 with screws 40. The sheet part 29 is placed on the upper surface of the disk part 27. The sheet portion 29 is made of plastic or plastic fiber that has a small coefficient of friction and hardly generates static electricity. The operation disk part 30 is placed on the upper surface of the sheet part 29. The holding part 31 is placed on the upper surface of the operation disk part 30, and by inserting the convex part 43 provided in the operation disk part 30 into the concave part 44 provided in the holding part 31, the sheet part 29 and the operation part 31 are operated. The disk part 30 is held. Therefore, the rotation state of the operation disk part 30 by the rotation operation of DJ is transmitted to the scale part 35 attached to the scale holding part 34 via the rotation shaft 32, and the operation disk part 30 and the scale part 35 are integrally formed. Rotate. Moreover, in order to confirm the rotation state of the operation disk part 30 visually, the operation disk part 30 or the holding | maintenance part 31 is provided with the mark which shows a rotation position.

The second optical sensor unit 33 includes an optical sensor a and an optical sensor b in order to detect the rotation state (rotation angle and rotation direction) of the scale unit 35 that rotates integrally with the operation disk unit 30, and the scale unit It is being fixed to the back surface of the panel 21 so that 35 slit parts can be detected. In addition, the first optical sensor unit 36 is configured to receive two light beams in the same manner as the second optical sensor unit 33 in order to detect the rotation state (rotation angle and rotation direction) of the scale unit 38 that rotates integrally with the disk unit 27. It is comprised from a sensor and is fixed to the upper surface of the panel 21 so that the slit part of the scale part 38 can be detected.

  On the outer peripheral portion of the scale portion 35, rectangular slit portions are provided at equal intervals. When the material of the scale part 35 is a metal, the slit part 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 is used for the scale portion 35, the slit portion is formed by printing. In this case, if carbon is included in the printing paint of the slit part, the accuracy of detecting the slit part by the second photosensor part 33 is improved. Similarly to the scale portion 35, the scale portion 38 is provided with rectangular slit portions at equal intervals on the outer periphery thereof.

  The first optical sensor unit 36 detects the slit portion of the scale unit 38, generates a first pulse signal corresponding to the rotation state of the disk unit 27, and inputs the first pulse signal to the control unit 12. The second optical sensor unit 33 detects the slit portion of the scale unit 35, generates a second pulse signal corresponding to the rotation state of the operation disk unit 30, and inputs the second pulse signal to the control unit 12. The second pulse signal generated by the second optical sensor unit 33 is input to the counter unit 15. The counter unit 15 starts counting pulses of the second pulse signal input from the optical sensor a or the optical sensor b of the second optical sensor unit 33 under the control of the control unit 12 and stops counting under the control of the control unit 12. To do. The counter unit 15 inputs the count number when the count is stopped to the control unit 12.

  From the first pulse signal input from the first optical sensor unit 36 and the second pulse signal input from the second optical sensor unit 33, the control unit 12 determines that the disk unit 27 and the operation disk unit 30 are in the same rotation state. It is determined whether or not there is. When the disk unit 27 and the operation disk unit 30 are in the same rotation state, the control unit 12 determines that the reproduction is performed at the standard speed, and controls the memory control unit 7 to set the digital audio data stored in the RAM 8 to the standard speed. Controls reading with the corresponding clock. When the control unit 12 determines that the disk unit 27 and the operation disk unit 30 are not in the same rotation state, the control unit 12 stores the data in the RAM 8 at a reading speed and direction corresponding to the second pulse signal input from the second optical sensor unit 33. The memory control unit 7 is controlled to read the digital audio data.

  The control unit 12 controls the counter unit 15 to start and stop counting the pulses of the second pulse signal, and calculates the first reproduction time from the count number input from the counter unit 15. Further, the control unit 12 calculates the reading 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 track elapsed time of the digital audio data read from the RAM 8 after the track reproduction is started. The control unit 12 stores the calculated read time in the read time storage unit 16. 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 1 second is 75 frames, the readout 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 becomes 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).

  In the CD player of this embodiment, when reproducing audio data recorded on a CD, the rotation speed of the disk portion 27 is the same as the rotation speed of the turntable during the reproduction of the analog record player per minute (33 + 1/3). The rotational speed of the motor 22 is determined so that The driving force of the motor 22 is transmitted to the belt 26 applied to the pulley unit 25 and the pulley unit 28 and the disk unit 27 rotates, so that the seat unit 29, the operation disk unit 30, the scale unit 35, and the scale unit 38 are Rotate at the same speed as the disk part 27. Here, the operation disk portion 30 has a large surface area so that it can follow the rotation of the disk portion 27, and by adjusting the material and thickness, even if the seat portion 29 being placed has a small friction coefficient, The dead weight and the moment of inertia are designed to rotate at the same rotational speed as the disk portion 27. The rotation direction of the motor 22 is the same as the rotation direction (clockwise direction) of the turntable of the analog record player. For this reason, in the CD player of the present embodiment, an operation similar to an operation for performing special reproduction such as scratch reproduction using an analog record can be performed.

  When scratch reproduction is performed using the CD player of the present embodiment, the DJ repeats an operation of quickly rotating the operation disk 30 in the forward direction or the reverse direction by hand. The control unit 12 determines the rotational speed and direction of the operation disk unit 30 from the second pulse signal input from the optical sensor a and the optical sensor b of the second optical sensor unit 33. 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.

  3 and 4 are flowcharts for explaining the operation when the CD player according to the embodiment of the present invention performs an operation of returning to the position where the first scratch reproduction is completed. FIG. 5 is a diagram for explaining the second reproduction time. In the CD player of this embodiment, when the operation disk unit 30 makes one rotation, the second optical sensor unit 33 generates a second pulse signal of 135 pulses, and the 1 pulse stored in the RAM 8 by one pulse of the second pulse signal. A description will be given assuming that digital audio data for a frame is read.

  In step 1 of FIG. 3, when the disk part 27 and the operation disk part 30 are rotated at the same speed and audio data is being reproduced at the standard speed, the operation disk part 30 is rotated and the first scratch reproduction is performed. In this step, the control unit 12 determines whether or not an operation has been performed. If the first scratch reproduction operation has been performed, the process proceeds to step 2.

  Step 2 is a step in which the control unit 12 determines the reading speed and direction of the digital audio data stored in the RAM 8 according to the second pulse signal input from the second optical sensor unit 33 and controls the memory control unit 7. It is. The control unit 12 performs control to read out one frame of digital audio data stored in the RAM 8 with one pulse of the second pulse signal in the read order determined. Further, the control unit 12 controls the servo control unit 3 so that digital audio data within a predetermined time including the digital audio data currently read out is stored in the RAM 8. For example, the digital audio data for 60 seconds before and after the currently read digital audio data is stored.

  Step 3 is a step in which the control unit 12 determines whether or not the scratch reproduction has ended. When the scratch reproduction is completed, the process proceeds to Step 4. From the first pulse signal input from the first optical sensor unit 36 and the second pulse signal input from the second optical sensor unit 33, the control unit 12 determines that the disk unit 27 and the operation disk unit 30 are in the same rotation state. By determining that there is, it is determined that the scratch reproduction has ended.

  Step 4 is a step of storing the reading time calculated by the control unit 12 in the reading time storage unit 16 when the scratch reproduction is finished. 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. This read time corresponds to the track elapsed time of the digital audio data read from the RAM 8 immediately after the scratch reproduction ends after the track reproduction is started. In this embodiment, when the scratch reproduction is finished, the readout time calculated by the control unit 12 is 3 minutes 00 seconds 00 frames. The point O shown in FIG. 5 indicates the reading time (3 minutes 00 seconds 00 frames) when the scratch reproduction is finished.

  Step 5 is a step in which the control unit 12 controls the counter unit 15 to start counting pulses of the second pulse signal after the completion of the first scratch reproduction. The counter unit 15 starts counting pulses of the second pulse signal input from the second optical sensor unit 33 under the control of the control unit 12.

  Step 6 is a step for controlling the control unit 12 to reproduce the audio data at the standard speed. From the first pulse signal input from the first optical sensor unit 36 and the second pulse signal input from the second optical sensor unit 33, the control unit 12 determines that the disk unit 27 and the operation disk unit 30 are in the same rotation state. If it is determined that the audio data is present, the audio data is controlled to be reproduced at the standard speed. In the present embodiment, after completion of the first scratch reproduction, the audio data at the standard speed is reproduced for 9 seconds.

  Step 7 is a step proceeding to Step 8 shown in FIG.

  Step 8 shown in FIG. 4 is a step in which the control unit 12 determines whether or not the reproduction of the audio data at the standard speed is finished and the operation disk unit 30 is rotated. Here, the DJ rotates the operation disk portion 30 counterclockwise in order to return to the time when the first scratch reproduction is completed (point O shown in FIG. 5). At this time, if the DJ does not want to output a sound reproduced when the operation disk unit 30 is rotated counterclockwise, the DJ performs an operation of decreasing the volume. If the operation disk 30 has been rotated, the process proceeds to step 9. If the operation disk 30 has not been rotated, the process proceeds to step 14. In this embodiment, since the audio data at the standard speed is reproduced from 3 minutes 00 seconds 00 frames for 9 seconds, the time at the end of the reproduction at the standard speed is 3 minutes 09 seconds 00 frames. A point A shown in FIG. 5 indicates a time (3 minutes 09 seconds 00 frames) at the end of reproduction at the standard speed. In other words, from the end of the first scratch playback in step 3 to the end of playback at the standard speed in step 9, audio data for the time from point O to point A shown in FIG. Become.

  Step 9 is a step in which the control unit 12 controls the counter unit 15 to stop counting the pulses of the second pulse signal. The counter unit 15 stops counting pulses of the second pulse signal input from the second optical sensor unit 33 under the control of the control unit 12 and inputs the count number to the control unit 12. The counter unit 15 is configured such that the operation disk unit 30 rotates and the second optical sensor unit 33 rotates between the end of the first scratch reproduction and the start of the rotation operation of the operation disk unit 30 in Step 8 (9 seconds). The generated pulses of the second pulse signal are counted.

  Step 10 is a step in which the control unit 12 calculates the first reproduction time from the count number input from the counter unit 15. Here, when the audio data at the standard speed is being reproduced, the operation disk unit 30 rotates (33 + 1/3) per minute. Therefore, the time required for the operation disk unit 30 to make one rotation is 1.8. Second (135 frames). Further, when the operation disk part 30 makes one rotation, the second optical sensor part 33 generates a second pulse signal of 135 pulses. For this reason, in this embodiment, when the second optical sensor unit 33 generates a second pulse signal of 135 pulses, 135 frames of audio data are reproduced. Therefore, the control unit 12 calculates the first reproduction time by using the count number input from the counter unit 15 as the number of frames. In this embodiment, since a deviation has occurred in the rotational speeds of the disk part 27 and the operation disk part 30, from the end of the first scratch reproduction (step 3) to the rotation operation of the operation disk part 30 being started (step 8). During the interval (9 seconds), the operation disk 30 rotates 4.5 (or 5 if no deviation occurs), and the counter 15 counts 608 (135 × 4.5 = 607.5). And Accordingly, since the control unit 12 calculates the first playback time using the count number as the number of frames, the control unit 12 calculates the first playback time as 08 seconds 08 frames (= 608/75). This first reproduction time corresponds to the time of the digital audio data read from the RAM 8 when the DJ rotates the operation disk unit 30 4.5 times.

  In step 11, the control unit 12 calculates a second reproduction time obtained by adding the first reproduction time calculated in step 10 to the readout time calculated and stored in step 4. In this embodiment, as described above, the readout time is 3 minutes 00 seconds 00 frames and the first playback time is 08 seconds 08 frames, so the second playback time is 3 minutes 08 seconds 08 frames. . Point B shown in FIG. 5 indicates the second reproduction time (3 minutes 08 seconds 08 frames).

  Step 12 is a step of performing control to read out the digital audio data stored in the RAM 8 corresponding to the second reproduction time calculated by the control unit 12 when the DJ starts the rotation operation of the operation disk unit 30 in Step 8. It is. Since the DJ rotates the operation disk unit 30 counterclockwise, the control unit 12 performs control to read digital audio data from the RAM 8 in descending order according to the rotation speed of the operation disk unit 30.

  When the operation disk unit 30 is rotated in Step 8, the control unit 12 performs the digital stored in the RAM 8 from the time corresponding to the point B (second reproduction time: 3 minutes 08 seconds 08 frames) shown in FIG. The audio data reading is started, and the digital audio data is controlled to be read from the RAM 8 according to the rotation state of the operation disk unit 30 from the digital audio data at this time. When the DJ rotates the operation disk 30 by 4.5 in the counterclockwise direction, the second optical sensor 33 generates a second pulse signal of 608 pulses, so that the point B shown in FIG. 5 (second reproduction time: Returning to the point O (reading time: 3 minutes 00 seconds 00 frames) shown in FIG. 5 from 3 minutes 08 seconds 08 frames) to 608 frames (08 seconds 08 frames) before, the time at which the first scratch reproduction ended Return to audio data.

  On the other hand, in the conventional DJ CD player, when the DJ rotates the operation disk 30 counterclockwise 4.5 times, the point A shown in FIG. 5 (reproduction end time: 3 minutes 09 seconds 00) Since the reading of the digital audio data stored in the RAM 8 is started from the time corresponding to (frame), it returns to the point C (3 minutes 00 seconds 67 frames) shown in FIG. 5 and the time when the first scratch reproduction ends. It is not possible to return to (point O shown in FIG. 5). On the other hand, in this embodiment, when the operation is rotated counterclockwise by the number of rotations of the operation disk unit 30 counted by the DJ, the digital audio data stored in the RAM 8 is read from the time corresponding to the second reproduction time. Since it starts, it is possible to return to the audio data at the time when the first scratch reproduction is completed.

Step 13 is a step proceeding to Step 2 shown in FIG.
In step 2, the digital audio data stored in the RAM 8 is read from a time corresponding to the calculated second reproduction time.

  Step 14 is a step in which the control unit 12 determines whether or not an operation other than the scratch reproduction has been performed. The control unit 12 determines whether or not the track search button, fast forward button, and fast reverse button of the operation unit 14 are pressed. If an operation other than the scratch reproduction is performed, the process proceeds to step 15. If no operation instruction has been given, the process proceeds to step 8.

  Step 15 is a step in which the control unit 12 performs control to stop the counting of the counter unit 15 and set the counted number to 0.

  Step 16 is a step proceeding to Step 1 in FIG.

  In the CD player which is an embodiment of the present invention, after the first scratch reproduction is finished (reading time), the first playing time is calculated according to the number of rotations of the operation disk unit 30 and the reading time is A second playback time is calculated by adding the playback time of 1. When the operation disk unit 30 is operated to return to the rotation position at which the first scratch reproduction is finished, reading of the digital audio data stored in the RAM 8 is started from the time corresponding to the calculated second reproduction time. Therefore, the DJ can return to the audio data at the time when the first scratch reproduction ended even if there is a deviation in the rotational speeds of the disk part 27 and the operation disk part 30, and the same effect as the first scratch reproduction. Sound can be output in the second scratch reproduction.

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 part with which the CD player which is an Example of this invention is provided. The flowchart explaining operation | movement when operation which returns to the position which the 1st scratch reproduction of the CD player which is an Example of this invention was complete | finished is performed. The flowchart explaining operation | movement when operation which returns to the position which the 1st scratch reproduction of the CD player which is an Example of this invention was complete | finished is performed. The figure explaining 2nd reproduction time. The figure which shows the side cross section of the conventional jog dial part.

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 ... reading time storage unit, 21 ... panel, 22 ... motor, 23 ... rotating shaft, 24 ... pulley , 25 ... pulley part, 26 ... belt, 27 ... disk part, 28 ... pulley part, 29 ... sheet part, 30 ... operation disk part, 31 ... holding part, 32 ... rotating shaft, 33 ... second optical sensor part, 34 ... Scale holding part, 35 ... Scale, 36 ... First optical sensor part, 37 ... Scale holding part, 38 ... Scale, 39 ... Washer, 40 ... Screw, 41 ... Bearing, 42 ... E-ring, 43 ... Convex part, 44 ... recess, 45 ... bearing, 46 ... Bearing, 51 ... Motor, 52 ... Disk part, 53 ... Operation disk part, 54 ... First sensor part, 55 ... Slit part, 56 ... Second sensor part, 57 ... Slit part, 58 ... Slip mat

Claims (3)

A playback unit for playing back audio data recorded on the optical disc, a storage unit for storing the audio data played by the playback unit, and an operation unit for instructing a reading speed and a 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 according to an instruction from the operation unit;
The operation unit includes an operation disk unit and a disk unit on which the operation disk unit is placed, detects a rotation by detecting a rotational speed and a rotation direction of the operation disk unit, a drive unit that rotationally drives the disk unit, and A rotation detection unit that generates a signal, and a counter unit that counts the number of rotation detection signals generated by the rotation detection unit,
The control unit stores a read time of the audio data read from the storage unit at the time when the first operation by the operation unit is finished, and when the second operation by the operation unit is started, The counter unit controls to read the audio data stored in the storage unit based on the number of rotation detection signals counted in the period from the end of the first operation to the start of the second operation and the reading time. An optical disc reproducing apparatus characterized by the above. The optical disk reproducing apparatus according to claim 1, wherein
The apparatus further comprises a frame detection unit that detects audio data read from the storage unit for each frame unit and generates a frame detection signal, and the reading time is a time calculated from the frame detection signal by the control unit An optical disc reproducing apparatus characterized by the above. The optical disk reproducing apparatus according to claim 2, wherein
The control unit calculates a first reproduction time from the number of rotation detection signals, and when a second operation by the operation unit is started, a second value obtained by adding the first reproduction time to the read time An optical disk reproducing apparatus, wherein the audio data stored in the storage unit is read from a reproduction time.

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