JP2005259275A - Optical disk playback device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk playback device capable of scratch-reproducing audio data recorded in an optical disk, by an operation similar to that when scratch-reproduction is carried out on an analog record player. <P>SOLUTION: This device is provided with a rotation detection section for detecting the rotational speed and the rotational direction of an operation disk; a counter section for starting incrementing the count of a rotation detection signals from an initial value, when audio data are read from a storage section in a descending order and the head of the audio data is read from the storage section, and decrementing the number of rotation detection signals from the incremented count, when the reading order of the audio data read from the storage section changes from an descending order to an ascending order; and a control section for controlling the outputting of the audio data without sound from an output section while the counter section increments or decrements the count of rotation detecting signals. <P>COPYRIGHT: (C)2005,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 jog dial is not rotated, the optical disc playback apparatus reads audio data from the memory at a standard speed and an ascending order address (hereinafter referred to as normal playback), and plays back the read audio data.

  For this reason, the optical disk reproducing device generates a sound effect equivalent to a rubbing sound due to 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 reproducing 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 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 in the clockwise direction. Scratch playback that repeats the rotation operation to rotate the record 1/2 may be performed. 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. 5 is a diagram for explaining the reproduction sound of scratch reproduction of the first track. FIG. 5A is a diagram for explaining the reproduction sound of scratch reproduction by an analog record player. FIG. 5B is a diagram for explaining the reproduction sound of scratch reproduction by a conventional optical disk reproduction apparatus.

  The OA section shown in FIG. 5 (a) is a playback that is played back when the analog record is rotated 1/4 in the clockwise direction after starting playback of the audio signal of the first track recorded in the analog record. Showing sound. In the OA section, an audio signal is reproduced from the beginning of the first track by the analog record player. The AB section indicates 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 BC section shows the playback sound that is played when the DJ further rotates the analog record 1/4 in the counterclockwise direction. In the BC section, when the analog record is rotated 1/4 of 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 CD section shows the playback sound that is played when the DJ rotates the analog record by 1/4 turn from the counterclockwise direction to the clockwise direction. When the analog record is rotated 1/4 in the clockwise direction in the CD section, the record needle moves in the trace groove moved in the BC section, so that no audio signal is output by the analog record player. The DE section 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.

  Therefore, as shown in FIG. 5 (a), when such scratch reproduction is performed, the analog record player reproduces the silence reproduction sound in the BC section in the reverse order in the CD section, and then in the DE section. The audio signal of the first track is reproduced.

  In addition, the DJ uses a conventional optical disc playback apparatus that can perform special playback such as scratch playback by rotating the jog dial, and audio data for a few seconds from the beginning of the first track recorded on the optical disc is recorded. Scratch playback may occur. With reference to FIG. 5 (b), a reproduction sound of scratch reproduction by a conventional optical disk reproduction apparatus will be described.

  The section oa shown in FIG. 5 (b) shows the reproduced sound that is reproduced after the 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 disc by the conventional optical disc reproducing apparatus is stored in the memory, and the audio data read from the memory is 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 bc indicates a 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 cd 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.

  In the conventional optical disk playback device, the audio data at the head of the first track is read from the memory in descending order (ab section), and when there is no sound (bc section), the jog dial turns counterclockwise. When rotated clockwise from the direction, playback starts from the audio data at the head of the first track. Therefore, in the conventional optical disk reproducing apparatus, when the jog dial is rotated in the clockwise direction in the cd section, the reproduction is started from the audio data at the head of the first track without generating a silent reproduction sound. There is a problem that it is impossible to generate a sound effect equivalent to the sound effect of scratch reproduction using a record player.

  The present invention has been made to solve the above-described problems, and is an optical disc playback that can perform scratch playback of audio data recorded on an optical disc by the same operation as when scratch playback is performed by an analog record player. An object is to provide an apparatus.

  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 operation disk unit for instructing the reading speed and reading order of the audio data stored in the control unit, a control unit for controlling the audio data stored in the storage unit in response to an instruction from the operation disk unit, and the storage unit In an optical disk playback device comprising an output unit for outputting audio data read from the disk unit, a disk unit for mounting the operation disk unit, a drive unit for rotationally driving the disk unit, and rotation of the operation disk unit A rotation detection unit that detects a speed and a rotation direction and generates a rotation detection signal, and detects that the head of audio data has been read from the storage unit When the audio data is read out from the storage unit in the descending order of reading under the control of the control unit and the control unit detects the start of the audio data, the number of pulses of the rotation detection signal is initialized. When the audio data is read out from the storage unit under the control of the control unit, the number of pulses of the rotation detection signal is calculated from the number of pulses counted up to that point. A counter unit that counts in a decreasing direction, and the control unit counts audio data from the storage unit while the counter unit counts in a direction of increasing or decreasing the number of pulses of the rotation detection signal. Control is performed to stop reading.

  Further, the invention according to claim 2 of the present application is the optical disk reproducing apparatus according to claim 1, wherein the control unit is configured such that the number of pulses counted in a direction in which the counter unit decreases the number of pulses of the rotation detection signal is an initial value. Then, control is performed to read from the head of the audio data from the storage unit.

  According to the present invention, it is possible to provide an optical disk reproducing apparatus capable of performing scratch reproduction of audio data recorded on an optical disk by an operation similar to that performed when scratch reproduction is performed by an analog record player.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In one embodiment of the present invention, a CD is provided with a jog dial in the operation unit, and the reading speed and reading order of the digital audio data reproduced from the CD and stored in the RAM can be changed according to the rotating speed and rotating direction of the jog dial. It is a player. 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, 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 head detection 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 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 this embodiment, the operation disk part 30 is a disk having a size equivalent to an analog record having a diameter of 10 cm to 30 cm, and the jog dial part is attached to the housing 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 increases (increments) the number of pulses of the second pulse signal input from the optical sensor a or the optical sensor b of the second optical sensor unit 33 by 1 or decreases by 1 under the control of the control unit 12. Count in direction (decrement).

  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 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 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).

  The control unit 12 includes a head detection unit 16 that detects that the head part of the digital audio data has been read from the RAM 8. The head detection unit 16 detects that the head part of the digital audio data has been read from the RAM 8 when the read time calculated by the control unit 12 is 0 minute 00 second 00 frame.

  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 the operation of quickly rotating the operation disk portion 30 in the clockwise direction or the counterclockwise 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.

  FIG. 3 is a flowchart for explaining the operation of scratch-reproducing audio data for several seconds from the beginning of the first track of the CD player according to one embodiment of the present invention. 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 rotate at the same speed and the audio data of the first track is reproduced at the standard speed, the DJ rotates the operation disk part 30; In this step, the control unit 12 determines whether or not a scratch reproduction operation has been performed. 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 30 has been rotated counterclockwise. The control unit 12 discriminates the rotation speed and direction of the operation disk unit 30 rotated by the DJ from the second pulse signal input from the optical sensors a and b of the second optical sensor unit 33. When the operation disk part 30 is rotated counterclockwise, the process proceeds to Step 3. When the operation disk 30 is rotated in the clockwise direction, the process proceeds to step 16.

  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 reading speed and descending address determined by the control unit 12 is converted into an analog audio signal by the DAC 10 via the frame detection unit 9 and output from the output terminal 11.

  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 digital audio data is read from the RAM 8 in descending order, the frame detector 9 generates a second frame detection signal and inputs it to the controller 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. When the digital audio data at the head of the first track is read from the RAM 8, the process proceeds to step 5. If the digital audio data at the head of the first track has not 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 control unit 12 determines 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. Here, in the CD player of this embodiment, 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 after the digital audio data at the head of the first track is read from the RAM 8, the control unit 12 controls the counter unit 15 to increment the number of pulses of the second pulse signal from the initial value. . The counter unit 15 increments the count from an initial value (for example, zero) every time a pulse of the second pulse signal is input from the second optical sensor unit 33 under the control of the control unit 12.

  Step 7 is a step in which the control unit 12 determines whether or not the operation disk unit 30 has been rotated from the counterclockwise direction to the clockwise direction. The control unit 12 discriminates the rotation speed and direction of the operation disk unit 30 rotated by the DJ from the second pulse signal input from the optical sensors a and b of the second optical sensor unit 33. When the operation disk 30 is rotated from the counterclockwise direction to the clockwise direction, the process proceeds to Step 8. If the operation disk 30 is rotated counterclockwise, the process proceeds to step 9.

  Step 8 is a step proceeding to Step 19 shown in FIG.

  Step 9 is a step in which the control unit 12 determines whether or not the scratch reproduction has ended. 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. When the scratch reproduction is completed, the process proceeds to Step 10. If the scratch reproduction has not ended, the process proceeds to step 4.

  Step 10 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. If the DJ completes the scratch reproduction operation before the digital audio data at the head of the first track is read from the RAM 8 in descending order, the counter unit 15 does not count the pulses of the second pulse signal. When the count number is the initial value, the process proceeds to step 11. If the count number is not the initial value, the process proceeds to step 12.

  Step 11 is a step in which the control unit 12 controls normal reproduction. When determining that the rotation states of the disk unit 27 and the operation disk unit 30 are the same, the control unit 12 controls normal reproduction (reading digital audio data from the RAM 8 at the standard speed and ascending address). In the CD player of this embodiment, when the digital audio data of the first track is read from the RAM 8 in descending order, when the DJ ends the scratch playback operation, normal playback starts from the position where the scratch playback ends. To do.

  Step 12 is a step in which the control unit 12 controls the counter unit 15 to decrement the number of pulses of the second pulse signal. When the DJ finishes the scratch reproduction operation, the operation disk portion 30 is rotated clockwise by the motor 22. When the control unit 12 determines that the operation disk unit 30 has rotated from the counterclockwise direction to the clockwise direction, the control unit 12 counts the count number every time the pulse of the second pulse signal is input from the count number incremented to the counter unit 15. Control to decrement.

  Step 13 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. If the count reaches the initial value, the process proceeds to step 13. If the count does not reach the initial value, the process proceeds to step 12.

  Step 14 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 performs control to read out the digital audio data of the first track from the RAM 8 in ascending order from the RAM 8. Here, in the CD player of this embodiment, the analog audio signal output from the output terminal 11 changes from silence to the analog audio signal of the first track.

  Step 15 is a step in which the control unit 12 performs control for normal reproduction. The control unit 12 performs normal playback of the first track. In the CD player of this embodiment, after the digital audio data at the head of the first track is read from the RAM 8 in descending order, the DJ further rotates the operation disk 30 counterclockwise to perform the scratch reproduction operation. Upon completion, until the counter unit 15 decrements the incremented count number to an initial value (that is, until the rotation amount of the operation disk unit 30 rotating in the clockwise direction becomes the rotation amount rotated in the counterclockwise direction). The digital audio data of the first track is not read from the RAM 8. Therefore, in the CD player of this embodiment, the analog audio signal output from the output terminal 11 is silent while the counter unit 15 increments or decrements the count every time the pulse of the second pulse signal is input. Become.

  Step 16 is a step of performing control to read out the digital audio data of the first track stored in the RAM 8 at the reading speed and ascending 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 ascending order address determined by the control unit 12 is converted into an analog audio signal by the DAC 10 via the frame detection unit 9 and output from the output terminal 11.

  Step 17 is a step in which the control unit 12 determines whether or not the scratch reproduction has ended. 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 DJ has finished the operation of scratch reproduction. When the scratch reproduction is completed, the process proceeds to step 18. If the scratch reproduction has not ended, the process proceeds to step 2.

  Step 18 is a step in which the control unit 12 controls normal reproduction. When determining that the rotation states of the disk unit 27 and the operation disk unit 30 are the same, the control unit 12 controls normal reproduction.

  Step 19 shown in FIG. 4 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 20. If the count is not the initial value, the process proceeds to step 21. Here, in the CD player of this embodiment, when the count number of the counter unit 15 is an initial value, the DJ sets the operation disk unit 30 before the digital audio data at the head of the first track is read from the RAM 8. This is a case of rotating from the counterclockwise direction to the clockwise direction. Further, 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, the DJ moves the operation disk unit 30 over. This is a case of rotating from the clockwise direction to the clockwise direction.

  Step 20 is a step proceeding to Step 16 shown in FIG.

  Step 21 is a step in which the control unit 12 controls the counter unit 15 to decrement the number of pulses of the second pulse signal. When the DJ rotates the operation disk unit 30 in the clockwise direction, the counter unit 15 receives a pulse of the second pulse signal from the second optical sensor unit 33 based on the count number incremented by the control of the control unit 12. Decrement the count.

  Step 22 is a step in which the controller 12 determines whether or not the operation disk 30 has been rotated from the clockwise direction to the counterclockwise direction. The control unit 12 discriminates the rotation speed and direction of the operation disk unit 30 rotated by the DJ from the second pulse signal input from the optical sensors a and b of the second optical sensor unit 33. When the operation disk 30 is rotated from the clockwise direction to the counterclockwise direction, the process proceeds to Step 23. If the operation disk 30 is rotated clockwise, the process proceeds to step 16.

  Step 23 is a step in which the control unit 12 controls the counter unit 15 to increment the number of pulses of the second pulse signal. In step 22, when the DJ rotates the operation disk unit 30 counterclockwise, the digital audio data at the head of the first track is not read from the RAM 8, so the counter unit 15 controls the control unit 12. Thus, every time a pulse of the second pulse signal is input from the second optical sensor unit 33, the count number is incremented.

  Step 24 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 25. If the count is not the initial value, the process proceeds to step 21.

  Step 25 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. When the count value of the counter unit 15 reaches the initial value, the control unit 12 performs control to read the digital audio data of the first track from the RAM 8 from the top. Here, in the CD player of this embodiment, the analog audio signal output from the output terminal 11 changes from silence to the analog audio signal of the first track.

  Step 26 is a step in which the control unit 12 determines whether or not the scratch reproduction has ended. 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 DJ has finished the operation of scratch reproduction. When the scratch reproduction is completed, the process proceeds to step 28. If the scratch reproduction has not ended, the process proceeds to step 27.

  Step 27 is a step proceeding to Step 2 shown in FIG.

  Step 28 is a step in which the control unit 12 controls normal reproduction. When determining that the rotation states of the disk unit 27 and the operation disk unit 30 are the same, the control unit 12 controls normal reproduction. In the CD player of this embodiment, when the digital audio data of the first track is read from the RAM 8 with the ascending address, when the DJ ends the scratch playback operation, normal playback starts from the position where the scratch playback ends. To do.

  In the above-described CD player of the present embodiment, after the DJ rotates the operation disk unit 30 counterclockwise and the digital audio data of the first track is read from the RAM 8 with the descending address, the operation disk unit 30 In order to detect the amount of rotation rotated in the counterclockwise direction, the counter unit 15 increments the count every time the pulse of the second pulse signal is input. When the operation disk unit 30 rotates in the clockwise direction from the counterclockwise direction, the count number is decremented each time a pulse of the second pulse signal is input from the count number incremented by the counter unit 15. The CD player of this embodiment stops reading the digital audio data from the RAM 8 while the counter unit 15 increments or decrements the pulse count of the second pulse signal, and when the decremented count reaches the initial value. Then, reading of the digital audio data of the first track from the RAM 8 at the ascending address is started. Therefore, the CD player according to the present embodiment rotates the operation disk unit 30 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.

  In the above-described embodiment, the scratch reproduction of the audio data of the first track recorded on the CD has been described. However, the present invention is not limited to the scratch reproduction of the audio data of all tracks recorded on the CD, not limited to the first track. The invention can be applied.

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 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, 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 The

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 reproducing apparatus comprising: a control unit that controls to read out audio data stored in the storage unit in response to an instruction from the operation disk unit; and an output unit that outputs the audio data read out from the storage unit In
A disk part for placing the operation disk part; a drive part for rotationally driving the disk part; a rotation detection part for detecting a rotation speed and a rotation direction of the operation disk part and generating a rotation detection signal; and the storage. A head detector that detects that the head of the audio data has been read from the unit, and audio data is read from the storage unit in descending order under the control of the controller, and the head detector When the head is detected, the number of pulses of the rotation detection signal is counted to increase from the initial value, and when the reading order of the audio data read from the storage unit by the control of the control unit becomes descending order to ascending order, A counter unit that counts in a direction to decrease the number of pulses of the rotation detection signal from the number of pulses counted in
The control unit controls to stop reading of audio data from the storage unit while the counter unit counts the number of pulses of the rotation detection signal in a direction of increasing or decreasing. Optical disk playback device. The optical disk reproducing apparatus according to claim 1, wherein
The control unit performs control to read from the head of audio data from the storage unit when the number of pulses counted in the direction in which the counter unit decreases the number of pulses of the rotation detection signal becomes an initial value. Optical disk playback device.

Images