JP3368675B2 - Disc playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus such as a compact disk (CD) and a mini disk (MD), and more particularly to adjustment of reproduction timing at the time of reproduction. It is. 2. Description of the Related Art When a live performance or the like is recorded by a recording / reproducing apparatus and edited, sometimes it happens that the timing of a certain sound is accidentally shifted. For example, when recording a drum performance, there is a case where the cymbal sound is shifted at a certain point during reproduction. In particular, if the timing of a loud musical instrument such as a cymbal is shifted even in one place, the influence on the entire song is great. In such a case, if the reproduction timing of a specific part can be instantaneously advanced or delayed at the time of editing and reproduced, the timing deviation can be made inconspicuous. [0003] However, in a conventional disk reproducing apparatus such as a CD player which continuously reads data from a disk and continuously reproduces the data, only the reproduction timing of a specific portion is instantaneously set. It was impossible to change it. Therefore, in the past, we re-recorded only the part where the sound shifted, or re-recorded everything from the beginning, but when recording a live performance, such re-recording itself may not be possible. is there. [0004] The present invention has been made in view of such a point, and has no influence on the rotation control of the disk at all, and can instantaneously change the reproduction timing of a specific portion of the disk. It is an object to provide a playback device. [0005] A disk reproducing apparatus according to the present invention comprises: a disk access unit for accessing a disk to read data; and a demodulation for demodulating data read by the disk access unit. Means, storage means for temporarily storing demodulated data from the demodulation means, output means for outputting the demodulated data read from the storage means as a reproduction signal, and
While intermittently writing to the storage means at the speed, the demodulated data written to the storage means is read out without interruption at a second speed lower than the first speed, and a time-shifted address or timing instruction is provided. and a control means for changing the playback timing of a specific part of the demodulated data based on said control means re of the specific portion
When playing back with raw timing delayed from normal playback
Contains the last data before the specific portion of the storage means.
After reading the closing price, the specific part via the silent part
Data is read out later than during normal playback and
Do not use the latter part of the data
As a result, the reproduction timing of only the specific portion is set.
Delay the playback timing of the specific part during normal playback
If the playback is performed earlier than the
Specify the above without using the latter half of the data before the fixed part
Part of the data is read out earlier than during normal playback, and
After reading the final value of the data in the specified part,
By reading the next data through the
Control to advance the playback timing only for the part
It is characterized by being. According to the present invention, the data read from the disk by the disk access and demodulated is temporarily stored in the storage means and then read out to become a reproduced signal. Since the writing speed to the storage means is higher than the reading speed from the storage means, writing to the storage means is an intermittent operation and a continuous reading operation from the storage means. According to the present invention, the reproduction timing is changed by changing the intermittent writing interval to the storage means by the control means, so that it is independent of the disk rotation control, that is, the disk rotation control system. Is the same configuration as before,
The reproduction timing of only a specific portion of the disc can be instantaneously changed. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an MD player according to one embodiment of the present invention. The MD type disk 1 is a magneto-optical disk capable of recording and reproduction. The disk 1 is rotated by a spindle motor 2 at a constant linear velocity, for example. Above and below the disk 1, a magnetic recording head 3 and an optical pickup 4 are arranged to face each other with the disk 1 interposed therebetween. The magnetic recording head 3 applies a magnetic field to the disk 1 when writing information to the disk 1. The optical pickup 4 has a function of optically reading information from the disk 1 and a function of writing information on the disk 1 in cooperation with the magnetic recording head 3. Optical pickup 4
Can be moved in the radial direction of the disk 1 by the feed motor 5. The read output of the optical pickup 4 is amplified by a high frequency (RF) amplifier 6 and supplied to a servo controller 7. The servo control unit 7 controls the rotation of the spindle motor 2 and the feed motor 5 based on the pickup output.
And the focus / tracking control of the pickup 3 are executed. [0008] The reproduction system of the MD player is configured as follows. That is, the output of the RF amplifier 6 is EFM
(Eight to fourteen modulation) also supplied to the encoder / decoder 8, where the ACIRC (Advanced cross
The data is decoded by an error correction method based on an interleave Reed-Solomon code), demodulated from 14-bit data to 8-bit data, and stored in the buffer memory 10 under the control of the memory controller 9. The reproduction address at that time is given by decoding the output of the RF amplifier 6 by the address decoder 11. Memory 1
The data stored in 0 is read out as appropriate by the memory controller 9, expanded by the audio compression / expansion unit 12, then D / A converted by the D / A converter 13, and output as a reproduced audio output signal. On the other hand, the recording system of the MD player is configured as follows. That is, the audio input signal to be recorded is A / D converted by the A / D converter 14 and supplied to the audio compression / decompression unit 12. The data supplied to the audio compression / decompression unit 12 is compressed here, and then stored in the memory 10 under the control of the memory controller 9. Data to be recorded stored in the memory 10 is transmitted to the EFM encoder / controller under the control of the memory controller 9.
The data is supplied to the decoder 8, subjected to EFM modulation and ACIRC encoding, and then supplied to the head driving unit 15. The recording head 3 is driven by the head driving unit 15 to record necessary data on the disk 1. The MD player further includes a system controller 16 for controlling the entire system, a display unit 17 for displaying various information, a reproduction mode, a recording mode,
A plurality of operation keys 18 are provided for designating a mode such as an edit mode, instructing a time shift, and designating an address thereof. The system controller 16 also has a function of executing control for instantaneously changing the writing interval to the memory 10 by the memory controller 9 in accordance with a time shift instruction. Next, the operation of the MD player will be described. The audio compression performed by the audio compression / decompression unit 12 is as follows.
This is performed in such a manner that unnecessary data is thinned out using the human auditory characteristics. For example, ATRAC (Adaptive Transform Acous)
In a compression technique called tic coding, information compression of about 1/5 is realized by utilizing the minimum audible characteristics of human beings and the masking effect. As described above, since the data recorded on the disk 1 is compressed data, access to the disk 1 for a continuously supplied recording signal or a continuously output reproduction signal is an intermittent operation. . For this reason, the MD player is provided with a buffer memory 10 for matching the two. The buffer memory 10 has a shock proof function. FIG. 2A is a timing chart showing an operation in a normal reproduction mode without a time shift.
In the normal reproduction mode, data compressed and recorded on the disk 1 is read out intermittently from the disk 1, and the read data is demodulated and buffered at a speed of 1.4 Mb / s (first speed), for example. While intermittently writing data to the memory 10, the read data written to the memory 10 is read out without interruption at a speed of 0.3 Mb / s (second speed), for example, and data is expanded, and then a transfer rate of 1.4 Mb / s is obtained. As a reproduction signal. FIG. 2B is a timing chart when a specific portion is reproduced with the reproduction timing delayed. Read data “1” is the same as in the normal playback mode.
The data is read out from the disk at a transfer rate of 1.4 Mb / s, demodulated, and then written to the memory 10.
From 0, data is continuously read at a transfer rate of 0.3 Mb / s. Then, after the audio is expanded, it is output as a 1.4 Mb / s reproduction signal. However, the timing at which the subsequent read data "2" is read from the disk 1 is delayed from that at the time of normal reproduction. Therefore, the data “1” in the memory 10 is lost before the next data “2” is stored in the memory 10. For example, the system controller 16 detects this when reading out the final value of the write address of the data “1” in the memory 10 and waits until the next data “2” is stored in the memory 10 and becomes readable. Then, the data supply to the audio compression / decompression unit 12 is stopped. When decompressing data, the audio compression / decompression unit 12 treats a portion without data as a silent region, and sets a silent state during this period. Since the next data “2” is reproduced through this silent portion, the reproduction timing of the data “2” is delayed. For the next data "3", the standby time is shorter than usual in order to return the reproduction timing to the normal timing. For this reason, the next data "3" is written to the memory 10 before all the data "2" is read, and the memory 10 becomes readable, so that the latter half of the data "2" is not used. If the unused portion is a silent portion from the time of recording, there is no problem from the beginning, or silent data may be set in advance in the editing process. As a result, the data “3” is reproduced at the normal reproduction timing. That is, only the reproduction timing of the data “2” is later than other data. FIG. 2C is a timing chart in the case where the reproduction timing of a specific portion is advanced and reproduced.
Read data “1” is the same as in the normal reproduction mode.
The timing at which the subsequent read data “2” is read from the disk 1 is earlier than in the normal reproduction. For this reason,
Before all the data “1” is read from the memory 10, the next data “2” is written to the memory 10 and becomes readable, so that the data in the latter half of the data “1” is not used. If the unused portion is a silent portion from the time of recording, there is no problem from the beginning, or silent data may be set in advance in the editing process. For the subsequent data "3", the standby time is made longer than usual in order to return the reproduction timing to the normal timing. Therefore, the data “2” in the memory 10 is lost before the next data “3” is stored in the memory 10. The system controller 16 detects the last value of the write address of the data “2” in the memory 10, for example, until the next data “3” is stored in the memory 10 and becomes readable. Then, the data supply to the audio compression / decompression unit 12 is stopped. When decompressing data, the audio compression / decompression unit 12 treats a portion without data as a silent region, and sets a silent state during this period. Through this silent part, the next data “3” is
It will be played back at normal playback timing. That is, only the reproduction timing of the data “2” is earlier than other data. The above-described reproduction timing adjustment is performed by inputting an address from the operation key 18 when the address to be time-shifted is known in advance, or by changing the time when shifting the time while listening to the reproduced sound. The user can give an instruction by operating the operation key 18 with. Further, it is desirable that the display unit 17 displays a disk address, reproduction time data, a memory address, or the like at an arbitrary timing so that an address to be time-shifted can be easily grasped. In the above embodiment, the present invention has been described by taking an MD player as an example.
The present invention is applied by providing a similar buffer memory with the linear velocity of the disk higher than usual, reading data from the disk intermittently at a high speed, writing to the memory, and continuously reading from the memory at a low speed. be able to. The target of recording and reproduction may be not only an audio signal but also an image signal and other data. As described above, according to the present invention,
Since the reproduction timing is adjusted by changing the writing interval to the storage means by the control means, the reproduction timing of only a specific portion of the disk is instantaneously changed regardless of the rotation control of the disk. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an MD player according to an embodiment of the present invention. FIG. 2 is a time chart showing a playback operation of the MD player with a change in playback timing. [Explanation of Symbols] 1 disk, 2 spindle motor, 3 magnetic recording head, 4 optical pickup, 5 feed motor, 6 RF
Amplifier, 7 servo control, 8 EFM encoder / decoder, 9 memory controller, 10 buffer memory, 11 address recorder, 12 audio compression / expansion unit, 13 D / A converter, 14 A / D Converter, 15 ...
Head drive unit, 16: system controller, 17: display unit, 18: operation keys.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 20/10 G11B 19/00-19/16

Claims (1)

(57) [Claim 1] Disk access means for accessing a disk to read data, demodulation means for demodulating data read by the disk access means, and demodulation means Storage means for temporarily storing the demodulated data of the data, output means for outputting the demodulated data read from the storage means as a reproduction signal, and intermittently writing the demodulated data to the storage means at a first speed. While reading, the demodulated data written in the storage means is read out without interruption at a second speed lower than the first speed, and a specific portion of the demodulated data is read based on an instruction of a time-shifted address or timing . Control means for changing the reproduction timing , wherein the control means transmits the reproduction timing of the specific portion.
If playback is performed later than during normal playback,
Reading the last value of the data before the specific part of the stage
The data of the specific part is normally re-
Read later than at the time of birth and after the specific part
By not using half of the data,
The reproduction timing of only the specific part is delayed, and the reproduction timing of the specific part is earlier than that during normal reproduction.
If the specific part of the storage means is to be reproduced,
The second half of the data before
Data is read out earlier than during normal playback, and
After reading the final value of the part data,
By reading the next data,
A disc reproducing apparatus characterized in that it controls so as to advance the reproduction timing only .