JPH10149632A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sound cutting when transfer is made from a reproducing mode to a fast-forwarding reproducing mode or a fast-rewinding reproducing mode in a disk player. SOLUTION: During reproducing, digital audio data read from a disk 1 is intermittently written in a buffer memory 35 and continuously read, and, from the read data, an audio signal is obtained. If a fast-forwarding key or a fast- rewinding key is pressed during reproducing, a pickup 4 changes its position for reading the data from the disk 1 faster than during reproducing and, concerning data written in the memory 35, the data read by the pickup 4 where a position for throwing the data except a specified amount of newest data and reading the same is changed at a high speed is written.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a disk reproducing apparatus.

[0002]

2. Description of the Related Art As a recording medium for digital audio signals and the like, a small optical disk called a "mini disk" is known. This optical disc includes a read-only disc and a disc capable of recording and reproducing an audio signal by a magneto-optical method. The outline of the optical disc for recording and reproduction will be described as follows.

That is, at the time of recording, an input analog audio signal has a sampling frequency of 44.1 kHz,
A / D conversion is performed on digital audio data having a quantization bit number of 16 bits. The digital audio data is sequentially divided into blocks for a predetermined period, and the data is compressed to a size of approximately 1/5 in units of the blocks. Is done. This data compression method combines DCT and a window function in consideration of human auditory characteristics, and is called MDCT. Hereinafter, the data compression block is referred to as a “sound group”.

[0004] The compressed audio data is subjected to an encoding process for error correction and a modulation process for recording, and the processed audio data is transferred to a disk by a magnetic head and a laser beam. Is recorded on a spiral track from the inner circumference to the outer circumference.

FIG. 8 shows a format of digital audio data after compression processing among signals recorded on a disk. This audio data is sequentially arranged in clusters CN, CN + 1, CN + 2,. Has been distributed. Each cluster is composed of 36 sectors L2 to L4, S0 to S3.
The digital audio data is recorded in sectors S0 to S31. Also, sectors L2 to L
4. L1 is called a “linking sector”, and the cluster C
It is for connection with clusters CN-1 and CN + 1 following N. It should be noted that recording on the disc is performed in units of one cluster.

The size of each sector is 2352 bytes, and the audio sectors S0 to S31 are:
In each case, the first 20 bytes are used as the header and the remaining 23
32 bytes are divided into 5.5 blocks of 424 bytes each. This block is the above sound group. At this time, the even-numbered and odd-numbered sectors are regarded as one set, and the last 0.5 sound group of the even-numbered sector and the first 0.5 sound group of the odd-numbered sector constitute one sound group. You.

[0007] One sound group has a total of 512 samples of digital audio data of stereo left and right channels in a data compressed state. Therefore, the time length of one sound group is 512 samples / 44.1 kHz ≒ 11.61 ms, and the data compression rate of each channel is 424 bytes / (16 bits × 512 samples × 2 channels)
≒ 1 / 4.8 times, resulting in about 1/5 data compression as described above.

[0008] A signal having such a format is encoded for recording and then recorded as a track on an optical disk.

The above-described reproduction of the optical disk may be performed in a complementary manner to the recording. That is, the signal is optically reproduced from the track of the disk by the optical pickup,
Data-compressed digital audio data is extracted from the reproduced signal, error correction is performed, and the error-corrected digital audio data is decompressed.
/ A conversion. By doing so, the original analog audio signal can be obtained.

[0010]

In a disk player (or a recording / reproducing apparatus) using the above-mentioned optical disk, if the optical disk becomes dirty or vibrated, the signal reading from the disk fails, and as a result, In some cases, the digital audio data may be chipped and the reproduced sound may be interrupted.

Therefore, in an actual disc player, such interruption of sound is prevented as follows. That is, first, when a signal is read (reproduced) from a disk, the digital audio data included in the read signal, that is, the bit rate (bit speed) of the digital audio data before data expansion is determined by the data expansion For example, the bit rate is set to be equal to the bit rate of the digital audio data that follows.

When reading signals from the disk, if everything is normal, the same digital audio data can be repeatedly obtained about five times in units of the rotation period of the disk. This means that audio data can be used effectively.

Further, the reproduction system of the disc player includes:
As schematically shown in FIG. 7, a ring buffer RBUF is provided. Then, the digital audio data after the error correction and before the data decompression are stored in the ring buffer RBUF,
At this time, the write address AWR is set at a predetermined speed, that is, at a normal time (at a normal time), at the bit rate of the digital audio data after data compression at the time of recording. At the corresponding speed, change in the increasing direction.

In this case, the writing is performed in sector units. Also, actually, a write pointer is prepared, and 1 from the address specified by the write pointer.
Digital audio data is written over a sector area. This is also true for reading.

At the same time as the writing, the digital audio data written in the ring buffer RBUF is read out, and at this time, the read address ARD is changed in the increasing direction. Then, the read digital audio data is decompressed,
After that, D / A conversion is performed to an analog audio signal.

This reading is performed in sector units.
Also, at this time, even if the reading is executed continuously, in the steady state, the writing of the digital audio data (the size of the hatched portion) in the ring buffer RBUF is performed so that the data amount (the size of the hatched portion) is always maintained at a specified amount. Is controlled.

Therefore, even if reading of a signal from the disk fails and digital audio data cannot be written to the ring buffer RBUF, the read address ARD
However, until the write address AWR catches up (until the hatched area disappears), there is no interruption in the reproduced sound.

The signal can be read from the disk several times before the read address ARD catches up with the write address AWR. Therefore, the retry of this read results in the writing to the ring buffer RBUF. The digital audio data to be reproduced can be made complete, so that the reproduced sound can be prevented from being interrupted.

At this time, the digital audio data included in the disk read signal has a bit rate about five times that of the digital audio data after data expansion, so that the write address AWR and the read address for the ring buffer RBUF are read. The interval between the ARDs can be kept at a predetermined value in a steady state, so that a failure of a signal from the disk can always be dealt with.

In this case, the digital audio data before data expansion is written to the ring buffer RBUF.
Since the readout processing is performed to prevent sound breakage, the ring buffer is compared with the case where the same processing is performed using digital audio data after data expansion.
The capacity of the RBUF can be reduced to about 1/5.

However, as described above, the ring buffer RBUF
If you use to prevent interruptions in the sound,
Since the ring buffer RBUF is empty, the digital audio data is written to the ring buffer RBUF and the reading from the ring buffer RBUF is waited until the write address AWR reaches the predetermined address ATH, and the digital audio data is written to the address ATH. Then, the reading is started.

By the way, in a disc player or a recording / reproducing apparatus using the above-mentioned optical disc,
Some have the following special playback functions.

[AMS Playback] While a song is being played, if the fast forward key is pressed for a short time, the playback position jumps to the beginning of the next song, and playback continues from the beginning of the next song. Or,
When a fast rewind key is pressed for a short while playing a certain song, the playback position jumps to the beginning of the current song, and playback is resumed from this beginning position.

[Fast-forward playback (CUE playback)] While a song is being played, if the fast-forward key is pressed for a long time, the optical pickup is moved in the forward direction at a higher speed than during normal playback while the fast-forward key is being pressed. Perform high-speed playback. When pressing the fast forward key is stopped, normal playback is resumed from the stopped position.

[Fast rewind playback (REV playback)] While a certain song is being played, if the fast rewind key is pressed for a long time, the optical pickup is moved in the reverse direction at a higher speed than during normal playback while the fast rewind key is pressed. To perform high-speed playback in the reverse direction. When pressing the fast-reverse key is stopped, normal playback is resumed from the stopped position.

It should be noted that the fast forward reproduction and the fast reverse reproduction differ only in the moving direction of the optical pickup, but the processing method of the reproduced signal is the same. .

In the following description, it is assumed that the boundary time between the time when the fast-forward key is pressed shortly for AMS playback and the time when the fast-forward key is pressed long for fast-forward playback is, for example, 0.5 second. That is, even if the fast-forward key is pressed, if the pressing is stopped within 0.5 seconds, the AMS playback is executed, and if the key is pressed for 0.5 seconds or longer, the fast-forward playback is executed.

Then, in the disc player, processing as shown in FIG. 5 is executed in order to realize fast forward reproduction (and fast reverse reproduction). That is, FIG.
This indicates the operation state of the fast-forward key, and a period t1 to t4 is a period in which the fast-forward key is pressed. Also, at time t2
Is a time point, for example, 0.5 seconds after the time point t1, and is a time point at which fast-forward playback is determined. At this point, fast forward reproduction is to be executed, so the fast forward key is pressed until an arbitrary time point t4 after the time point t2.

FIG. 5B shows the movement of the optical pickup. The movement is in the reproduction mode until time t2. However, during the period t2 to t4, high-speed movement for fast-forward reproduction is performed. This is the movement in the playback mode.

FIG. 5C shows digital audio data to be written into the ring buffer RBUF at time t2.
Until, digital audio data in the playback mode is written, but when fast-forward playback is determined at time t2, all digital data in the ring buffer RBUF is discarded,
Thereafter, digital audio data in the fast-forward playback mode is written. Then, since the fast-forward playback mode is released at time t4, the ring buffer RBUF is released at time t4.
, All digital audio data is discarded, and thereafter, digital audio data in the reproduction mode is written again.

FIG. 5D shows digital audio data read from the ring buffer RBUF. Until time t2, digital audio data in the playback mode is read. However, at time t2, the ring buffer R
All digital audio data in BUF is discarded,
From time point 2, digital audio data in the fast-forward playback mode is newly written to the ring buffer RBUF, but reading is not permitted until the digital audio data is written to the address ATH as described above.

When the digital audio data of the fast forward reproduction is written up to the address ATH at time t3, the reading of the ring buffer RBUF is permitted.
From this time point t3, the digital audio data in the fast forward playback mode is read.

Then, at time points t4 and t5, the same read processing as at time points t2 and t3 is executed, and after time point t5, the digital audio data in the reproduction mode is read out.

Since the analog audio signal is reproduced from the digital audio data read as described above, the analog audio signal output from the disc player is as shown in FIG. 5E. That is, the audio signal in the reproduction mode is output until time t2, but the audio signal in the fast-forward reproduction mode is output during the period t3 to t4, and the audio signal in the reproduction mode is output again after time t5.

Thus, when the fast forward key is pressed for a long time during the reproduction, the fast forward reproduction is realized. Also, when the fast-return key is pressed during playback, fast-forward playback is realized in a similar manner. AMS reproduction is realized as shown in FIG.

However, as described above and as shown in FIG. 5E, when fast forward playback or fast reverse playback is executed, the period t2 to t3 is silent. That is, when switching from the playback mode to the fast-forward playback mode (and the fast-reverse playback mode), sound interruption occurs. This is uncomfortable for the user and is not a good mechanism for the user interface.

The present invention is to solve such a problem.

[0038]

According to the present invention, there is provided a pickup for reading data recorded on a disk from a disk, and a memory for storing the data. The data read intermittently is written to the memory and read continuously, and when the fast-forward key or the fast-reverse key is pressed during the reproduction, the position at which the pickup reads the data from the disk is set to Also, the data written in the memory is discarded while leaving the latest predetermined amount of data, and the read position is changed at a high speed. When the fast forward key or the fast reverse key is released, the process returns to the reproduction mode. It is an disc reproducing apparatus. Therefore, even when the mode is switched from the reproduction mode to the fast forward reproduction mode or the fast reverse reproduction mode, the data read from the memory continues, and as a result, no sound interruption occurs.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION

[Configuration of Recording / Reproducing Apparatus] FIG. 1 shows an example of a mini-disc recording / reproducing apparatus to which the present invention is applied. Reference numeral 1 denotes the mini-disc, which is a magneto-optical disc of the standard described with reference to FIG. 8 and is housed in a cartridge 1A. A pregroove is formed on the disc 1 for controlling the tracking of the light beam, and an absolute address signal is recorded in the pregroove.

Further, the disk 1 is rotated by the spindle motor 2 and its rotation is controlled by the servo control circuit 5 so that the linear velocity of the disk 1 becomes constant. A magnetic head 3 for recording is disposed on one surface of the disk 1 through a shutter opening of the cartridge 1A, and an optical pickup 4 is disposed on the other surface of the disk 1 through a shutter opening. Placed. The focus and tracking of the optical pickup 4 are controlled by a servo control circuit 5, and the head 3 and the optical pickup 4 are controlled.
Can be moved in the radial direction of the disk 1 by the feed motor 6.

A system controller 20 is provided to manage the operation of the recording / reproducing apparatus. For this reason,
The system controller 20 is constituted by a microcomputer, and has, for example, a special reproduction routine 100 shown in FIG. 2 as a part of a program for managing its operation. Although details of this routine 100 will be described later, FIG. 2 shows only parts related to the present invention for simplicity, and also shows processing executed by peripheral circuits controlled by the system controller 20. Shown together.

Further, the system controller 20 includes:
Operation keys 10 such as an eject key, a play key, a stop key, a recording key, an erase key, and a power key are connected, and a display 30 is connected.
At 0, various kinds of information on the disk 1, for example, the elapsed time of the music being reproduced, the track number of the music being reproduced, and the like are displayed.

Reference numerals 31 to 42 denote recording / reproducing circuits, which are controlled by the system controller 20, and perform recording and reproduction as follows.

[Recording] At the time of recording, a stereo analog audio signal is supplied to the A / D converter 32 through the input terminal 31 and the sampling frequency is 44.1 kHz.
The A / D conversion is performed to digital audio data having a quantization bit number of 16 bits, and this digital audio data is supplied to the audio compression encoding / decoding circuit 33 and is compressed by the MDCT to a data amount of about 1/5. You.

The compressed digital audio data is temporarily written into the buffer memory 35 by the memory controller 34, and is sequentially read out at a speed about five times the writing speed. If the data is data encoded /
The data is supplied to the decoding circuit 36 and encoded into the data having the sector structure described above.

Then, the encoded audio data is supplied to an EFM and CIRC encoding / decoding circuit 37, where an encoding process for error detection and correction is performed, and a modulation process suitable for recording, in this example, EFM (8-14 modulation) processing is performed. In this example, the code for error detection and correction is C
The interleave changed for D's CIRC is used. The encoding / decoding circuit 37
, Linking sectors L2 to L4 and L1 are added to form audio data having the above-described cluster structure.

Then, the audio data is supplied to the head 3 through the head drive circuit 38, and a magnetic field modulated by the audio data is supplied to the disk 1. At this time, the laser beam from the optical pickup 4 is applied to the disk 1, and the magnetic head 3 and the optical pickup 4 are moved in the radial direction of the disk 1 synchronously. Thus, the irradiation of light from the optical pickup 4 and the modulation magnetic field by the magnetic head 3 cause the disc 1 to emit light.
Is recorded with audio data from the drive circuit 38 by thermomagnetic recording.

Further, at the time of this recording, the detection output of the optical pickup 4 is supplied to the address decoder 40 through the RF amplifier 39, and the absolute address signal recorded in the pre-groove of the disk 1 is extracted and decoded. The absolute address signal obtained is EFM and CI
The data is supplied to the RC encoding / decoding circuit 37, inserted into the audio data, and recorded on the disk 1.

The absolute address signal is also supplied to the system controller 20, and is used for recognizing the recording position and controlling the position. Further, the output signal of the RF amplifier 39 is supplied to the servo control circuit 5, and the servo control is performed by the pre-groove signal of the disk 1 so that the linear velocity of the disk 1 becomes constant.

[Normal Playback] At the time of playback, the servo control circuit 5 uses the pre-groove signal to rotate the disk 1 at a constant linear velocity equal to that at the time of recording in the same manner as at the time of recording.

The optical pickup 4 detects the reflected light of the laser beam irradiating the target track, and supplies the detection output to the RF amplifier 39, for example, to detect a focus error by the astigmatism method. For example, a tracking error is detected by a push-pull method. Then, these error signals are supplied to the servo control circuit 5, and the optical pickup 4 is controlled so that the focus error and the tracking error are eliminated.

Further, in the RF amplifier 39, a difference in the polarization angle of the reflected light from the target track is detected and a reproduction signal is taken out, and the reproduction signal is binarized to obtain the EFM and CIRC encoding / decoding circuit 3.
7 is supplied.

In the EFM and CIRC encoding / decoding circuit 37, the reproduced signal is EFM-demodulated, error-corrected, and digital audio data is taken out. The digital audio data is sent to the data encoding / decoding circuit 36. The supplied digital audio data is decoded into the original compressed digital audio data. Further, the decoded digital audio data is intermittently written to the buffer memory 35 through the memory controller 34, and is sequentially read at a speed of about 1/5 of the writing speed. At this time, the buffer memory 35 acts as a ring buffer RBUF, and writing and reading are performed as described with reference to FIG.

At this time, the output signal of the RF amplifier 39 is supplied to the address decoder 40, and the absolute address signal from the pre-groove is extracted and decoded.
The optical pickup 4 is supplied to the system controller 20 through the decode circuit 37 and
Is used to control the reproduction position in the radial direction of the disc. In the system controller 20, address information in sector units is also extracted from the reproduction signal, and is used for managing the reproduction position of the optical pickup 4.

In this way, the digital audio data whose data has been expanded is continuously read from the buffer memory 35. Then, the read digital audio data is supplied to the audio compression encoding / decoding circuit 33 through the memory controller 34 and expanded to original digital audio data, and the digital audio data is supplied to the D / A converter 41. Then, the digital signal is D / A converted into the original stereo analog signal, and the stereo analog signal is taken out to the output terminal 42.

[Fast forward playback (and fast reverse playback)]
In addition to the above-described reproduction operation, in particular, in the present invention, during fast-forward reproduction (and during fast-reverse reproduction), processing or operation is executed as shown in FIG.

That is, FIG. 3A shows the operation state of the fast-forward key, and a period t1 to t4 is a period in which the fast-forward key is pressed. Further, FIG. 3B shows the movement of the optical pickup. The movement in the playback mode is performed until time t1. However, during the period t1 to t4, the movement is performed at a high speed for fast-forward playback. Movement.

FIG. 3C shows digital audio data to be written into the ring buffer RBUF, at time t1.
Until then, digital audio data in the reproduction mode is written, but at time t1, the digital audio data in the reproduction mode written in the ring buffer RBUF is discarded except for the latest 0.5 seconds.

Subsequently, digital audio data in the fast-forward playback mode is written into the ring buffer RBUF. Then, since the fast-forward playback mode is canceled at the time point t4, all the digital audio data in the ring buffer RBUF is cleared at the time point t4, and thereafter, the digital audio data in the playback mode is written again.

FIG. 3D shows the digital audio data read from the ring buffer RBUF. First, the digital audio data in the reproduction mode is read out until time t1. Then, as shown in FIG. 3C, the digital audio data in the ring buffer RBUF is discarded at the time t1, but at this time, since the latest 0.5 second digital audio data is left in the ring buffer RBUF, Until the time point t2 after 0.5 seconds, the digital audio data in the reproduction mode can be read from the ring buffer RBUF.

Further, after time t1, the ring buffer R
Since digital audio data for fast-forward playback is written in the BUF, after time t2, digital audio data in fast-forward playback mode that has been written from time t1 is read.

At time t4, all the digital audio data in the ring buffer RBUF is discarded.
, New digital audio data in the reproduction mode is written to the ring buffer RBUF, but the reading is not permitted until this is written to the address ATH.

However, when the digital audio data in the reproduction mode is written up to the address ATH at the time t5, the reading of the ring buffer RBUF is permitted.
From this time point t5, the digital audio data in the fast forward playback mode is read.

Since the analog audio signal is reproduced from the digital audio data read as described above, the analog audio signal output from the disc player is as shown in FIG. 3E. That is, the audio signal in the reproduction mode is output until the time point t2, and the audio signal in the fast-forward reproduction mode is output continuously from the time point 2. Then, after time t5, the audio signal in the reproduction mode is output again.

Therefore, if the fast-forward key is pressed for a long time during playback, the fast-forward playback mode is realized, but there is no sound interruption when switching from the playback mode to the fast-forward playback mode.

Note that when the fast-return key is pressed during playback, fast-return playback is realized in the same manner. Also, AMS
Reproduction is realized as shown in FIG.

The reproduction state shown in FIG. 3 can be realized by, for example, the routine 100. That is, when the fast-forward key of the operation keys 10 is pressed at an arbitrary time t1, this is detected by the system controller 20, and the processing of the routine 100 starts from step 101 in the system controller 20, and then in step 102, Instruction to start high-speed movement of the optical pickup 4 is made, and subsequently, in step 103, a timer for measuring the period t1 to t2 is set to an initial value.

Then, in step 104, the digital audio data in the reproduction mode written in the ring buffer RBUF is discarded except for the latest 0.5 seconds. Note that this data is actually discarded through the ring buffer RB through the memory controller 34.
This is realized by controlling the addresses AWR and ARD for the UF, and setting the read address ARD to the corresponding address 0.5 seconds before the write address AWR.

Subsequently, the process proceeds to step 111, in which the ring buffer RBUF is controlled to a fast-forward playback mode, that is, a mode in which the ring buffer RBUF writes digital audio data in the fast-forward playback mode. Then, in step 112, the timer set in step 103 is incremented by a predetermined value. Then, in step 113, it is checked whether the timer has measured 0.5 seconds, that is, whether it has reached time t2. Is done.

If the time t2 has not been reached, the process proceeds from step 113 to step 114,
It is checked whether the fast forward key has been pressed, and if so, the process returns to step 112. Therefore, steps 112 to 114 are repeated thereafter.

The state in which the fast forward key is pressed is
If the time continues for 0.5 seconds or more, that is, at time t2 when the fast-forward key is pressed, the process proceeds from step 113 to step 121, and this step 121 is repeated while the fast-forward key is pressed. And at time t4
If the fast-forward key is no longer depressed, the process proceeds to step 12.
From 1 the process proceeds to step 122, where the reproduction mode after time t4 is executed. Therefore, the fast-forward playback described with reference to FIG. 3 has been executed.

On the other hand, if the fast-forward key is released during the period during which steps 112 to 114 are repeated, that is, before time t2, the processing proceeds from step 114 to step 13
Then, in step 131, all the digital audio data in the ring buffer RBUF is discarded. Then, in step 132 and thereafter, the jump to the head position of the next music and the reproduction of the music after the jump are executed. Therefore, AMS reproduction has been executed.

As described above, according to this disc player, when the fast forward key or the fast reverse key is pressed during the playback, the fast forward playback or the fast reverse playback can be performed. There is no sound interruption when switching to the reverse playback mode.

As is apparent from comparison between FIG. 4 and FIG. 6, the AMS reproduction is not affected. Therefore, there is no sense of incongruity in the sense of hearing, and the user interface is excellent.

[Others] In the above description, the disk 1 is
Even in the case of D, the present invention can be applied by setting the track speed higher than that during recording.

[0076]

According to the present invention, when the fast forward key or the fast reverse key is pressed during playback to switch from the play mode to the fast forward play mode or the fast reverse play mode,
There is no sound interruption.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating one embodiment of the present invention.

FIG. 2 is a flowchart illustrating one embodiment of the present invention.

FIG. 3 is a transition diagram illustrating one embodiment of the present invention.

FIG. 4 is a transition diagram illustrating one embodiment of the present invention.

FIG. 5 is a transition diagram for explaining the present invention.

FIG. 6 is a transition diagram for explaining the present invention.

FIG. 7 is a schematic diagram for explaining the present invention.

FIG. 8 is a format diagram for explaining the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Spindle motor, 4 ... Optical pickup, 5 ... Servo control circuit, 6 ... Feed motor, 20 ...
System controller, 32A / D converter, 33 ...
Audio compression encoding / decoding circuit, 34: memory controller, 35: buffer memory, 36: data encoding / decoding circuit, 37: EFM and CIRC encoding / decoding circuit, 38: head driving circuit, 39 ...
RF amplifier, 40 address decoder, 100 special reproduction routine, RBUF ring buffer

Claims (2)

[Claims] 1. A pickup for reading data recorded on a disc from a disc, and a memory for storing the data, wherein at the time of reproduction, data read by the pickup is intermittently stored in the memory. While writing and reading continuously, during the playback, when the fast forward key or fast reverse key is pressed, the position at which the pickup reads the data from the disk is changed at a higher speed than during the playback, and the memory is read. Write the data read by the pickup in which the data written into the disc is discarded while leaving the latest predetermined amount of data, and the read position is changed at a high speed. A disc reproducing apparatus which, when released, returns to the above reproduction process. 2. The disk reproducing apparatus according to claim 1, wherein, during said reproduction, when said fast-forward key or fast-reverse key is pressed for a shorter period than a predetermined period, said pickup moves said disk from said disk. A disc reproducing apparatus in which a data reading position is changed to a head position of a next or present data recording range.