JP2000251410A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk reproducing device capable of immediately performing program searching without waiting for a pick-up access time at the time of skip reproduction without increasincg a memory capacity for writing a head data of each track beforehand. SOLUTION: This disk reproducing device is provided with a recorded position managing means 11 for managing a recorded position of a track recorded on a disk. And, the recorded position managing means 11 compares a recorded position of a last data written in a normal area of a memory means 4 with a recording position of a head data of each block to be written in a special area of a memory means 4. Further, the head data to be written in the special area is decreased in the write quantity by a system control means decreases when a recorded position difference compared by the recorded position managing means 11 is small, and the head data is increased in the write quantity when the recorded position difference is large.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus for reproducing music or the like using a small optical disk or a magneto-optical disk.

[0002]

2. Description of the Related Art For example, a disk system called a so-called mini disk (MD) for reproducing music or the like by using a small magneto-optical disk has been proposed (Japanese Patent Application No. Hei.
No. 275067).

[0003] In general, a reproducing apparatus using a disc is characterized in that access to so-called cueing or the like is faster than when a tape is used. However, in reality, an access time such as a transfer time of the pickup is required, and it usually takes about 1 second to perform cueing. However, it is not preferable that such a long time is taken in a reproducing apparatus using a disc characterized by quick access.

In the above-described minidisk reproducing apparatus, if the apparatus is configured to be portable, there is a possibility that the pickup may come off the reproduction track due to an impact during reproduction or the like, and the reproduction may be interrupted. Therefore, in such a disk reproducing apparatus, a large-capacity memory (quake-resistant memory) is provided inside, and even if the pickup comes off the reproduction track, it is stored in this memory until it returns to the original track by the servo. Data is used to maintain data continuity.

In view of the above, conventionally, a special area is provided in a part of the seismic memory, and the head data of each track recorded on the disk is stored in the special area by a predetermined amount in advance. When a skip reproduction instruction to another track is issued, first, the head data stored in the special area is read out, and at the same time, the pickup is transferred to the specified track (meaning the specified another track) in parallel with the head data. By reading the subsequent data from the disk and storing it in the normal area of the earthquake-resistant memory, and switching to data reading from the normal area when all of the leading data has been read, it is possible to immediately locate the head without waiting for access time. A possible method has been proposed (see Japanese Patent Application Laid-Open No. 5-266593).

Hereinafter, a conventional example of such a technique will be described with reference to the drawings.

FIG. 8 is a block diagram showing a configuration of a conventional disk reproducing apparatus. FIG. 9 is a schematic diagram showing a configuration of a disc in a conventional example. FIG. 10 is a first operation timing chart at the time of a skip reproduction command in the conventional example. FIG. 10 shows a time change of the data accumulation amount, a system operation command corresponding thereto (NO.3 skip reproduction command),
Reproduction output operation (NO.1 reproduction output, mute, NO.3
3 shows a reproduction output), a disk reproduction operation (standby, reproduction), and a servo operation (JUMP, reproduction, No. 3 access). FIG. 11 is a timing chart of writing the leading data in the conventional example. FIG. 11 shows a time change of the data accumulation amount and a reproduction output operation corresponding thereto (NO. 1 reproduction output).
, Disk reproduction operation (standby, reproduction), and servo operation (reproduction, NO.2 access, NO.3 access, NO.
4 access, NO. 5 access, NO. 1 access). FIG. 12 is a schematic diagram showing the configuration of a conventional earthquake-resistant memory. FIG. 13 is a second operation timing chart at the time of the skip reproduction command. FIG. 13 shows the time change of the data accumulation amount and the corresponding system operation command (NO.
3 skip playback command), playback output operation (NO. 1 playback output, NO. 3 playback output), disk playback operation (standby, playback), and servo operation (JUMP, playback, NO. 3).
Access).

In this disc reproducing apparatus, as shown in FIG. 8, a disc (mini-disc) 1 is irradiated with laser light from a pickup 2 so that the pickup 2 reads a signal recorded on the disc 1. I have.
The reproduction / demodulation means 3 includes an EFM (8-14 modulation) signal for transmitting main information such as a compressed audio signal, and an ADIP (address) for transmitting position information on the disk 1 from the signal on the disk 1 read by the pickup 2. ) Signals and servo signals such as a focus error signal and a tracking error signal used for position control of the pickup 2 are demodulated by analog signal processing, and compressed audio data is processed by digital signal processing from EFM signals and ADIP (ADdress In Pregroove) signals. And demodulate the address information.

The compressed audio data reproduced by the reproduction / demodulation means 3 is intermittently written into the memory means 4 at a first speed, and then the reproduction output of the audio signal is performed in response to a request from the reproduction output means 5. In response to a read request from the memory means 4 to start, the data is continuously read from the memory means 4 at a second speed lower than the first speed, and the reproduction output means 5 performs audio expansion processing. The original digital audio signal.

Thereafter, although not shown, the digital audio signal is restored to an analog audio signal by a digital-to-analog converter and is output as a reproduction output signal from, for example, speakers or headphones.

The memory control means 6 controls a write address and a read address of the memory means 4.

The pickup transfer means 7 is based on the focus error signal and the tracking error signal sent from the reproduction / demodulation means 3, and performs focus servo and tracking servo of the pickup 2;
The servo for transferring the entire disk 1 in the radial direction is performed.

The system control means 8 monitors the difference between the write address and the read address of the memory means 4, that is, the data storage amount of the memory means 4, and the data storage amount is determined to be the first.
When the data amount becomes equal to or less than the comparison value, the writing of the compressed audio data from the reproduction / demodulation means 3 to the memory means 4 via the memory control means 6 is started. Stop writing.

The operation input means 9 instructs the system control means 8 to start and end the reproduction operation and to perform special reproduction such as skip reproduction.

The system control means 8 controls the pickup transfer means so that the read position from the disk 1 is continuous before and after intermittently starting and stopping the writing of compressed audio data from the reproduction / demodulation means 3 to the memory means 4. 7
Causes the pickup 2 to access the optimum position of the disk 1.

While the compressed audio data thus reproduced is intermittently written into the memory means 4 at the first speed, the compressed audio data is continuously read out at the second speed lower than the first speed, and the reproduced output means 5 is read out. Disc (mini-disc)
1 is satisfactorily reproduced.

Next, the operation when skip reproduction is instructed by the operation input means 9 will be described.

As shown in FIG. 9, the disc 1 is recorded in the order of track numbers 1, 2, 3, 4, and 5 from the inner circumference to the outer circumference, and the respective recording start positions are a, b, c, and c.
d and e.

Referring to FIG. 10, a description will be given of a case where skip reproduction to a track of track number 3 is instructed during reproduction and output of the track of track number 1 (NO. 1).
The system control means 8 monitors the data storage amount of the memory means 4 and, if the data storage amount becomes equal to or smaller than the first comparison value, from the reproduction / demodulation means 3 via the memory control means 6 to the memory means 4.
Writing of compressed audio data is started, and writing of compressed audio data is stopped when the data storage amount becomes equal to or greater than the second comparison value.

Therefore, the system control means 8 writes the compressed audio data reproduced from the disk 1 to the memory means 4 while the data storage amount is rising to the right, and writes the compressed audio data to the memory means 4 while the data storage amount is to the right. The writing is stopped and, for example, the pickup 2 jumps back and waits. On the other hand, the reproduction output of the track of track number 1 from the reproduction output means 5 is performed intermittently. That is, in FIG. Reproduction output is performed intermittently until the 3 skip reproduction command.

Here, when skip reproduction to the track of track number 3 (NO. 3) is instructed by the operation input means 9, the system control means 8 immediately outputs the track of track number 1 from the reproduction output means 5. The playback output is stopped and the mute process is performed, and at the same time, the pickup 2
Is instructed to move the track to the recording start position c. When the access of the pickup 2 is completed, the compressed audio data of the track of the track number 3 is reproduced from the disk 1 and writing to the memory means 4 is started. When the amount of data stored in the memory means 4 exceeds a predetermined value, the mute processing is released, and the reproduction output means 5 starts reproduction and output of the track of track number 3.

Therefore, even if the skip reproduction to the track number 3 is instructed by the operation input means 9, at least the pickup 2 is moved to the recording start position c of the track of the track number 3
For example, it is necessary to mute the reproduction output for a period until the access to the file, for example, about 1 second, so that there is a problem that quick cueing cannot be performed.

In view of the above problems, the head data of each track recorded on the disk 1 is previously written in the memory unit 4 by a predetermined amount in advance, and skip reproduction is instructed by the operation input unit 9. A method has been proposed in which a cue can be immediately performed without waiting for the access time of the pickup 2 and performing a mute process.

As shown in FIG. 11, the system control means 8 controls the track number of the pickup 2 during the period when the data storage amount of the memory means 4 exceeds the second comparison value and the writing of the compressed audio data is stopped. The transfer of the track No. 2 to the recording start position b is instructed, and when the access is completed, the head data of the track of the track No. 2 is written into the memory means 4 by a predetermined amount.

Similarly, the head data of each of the track numbers 3, 4, and 5 is also written into the memory means 4 by a predetermined amount.
When the writing of the leading data to the track of track number 5 is completed, the pickup 2 is moved to the track of track number 1 again, and the data of the track of track number 1 following the data whose writing to the memory means 4 is stopped is transferred from the disk 1. The data is reproduced and the writing of the data to the memory means 4 is restarted. Thereafter, the reproduction operation of the track with the track number 1 is continued. Here, writing of the leading data of each track from track number 2 to track number 5 may be divided into several times so that the data storage amount of the track with track number 1 in the memory means 4 does not become empty.

In the memory means 4, as shown in FIG.
The normal area in which the data of the track of track number 1 reproduced and output by the reproduction output means 5 is written, and the track numbers 2, 3, 4, and 5 which are not reproduced and output by the reproduction output means 5
5 is provided with a special area in which the head data of each track is written in advance. Then, while the writing of the data of the track of track number 1 to the normal area of the memory means 4 is stopped at the recording position of a + m, each of the track numbers 2, 3, 4, and 5 is transferred to the special area of the memory means 4. The head data of the track is written by a predetermined amount n. Therefore, at this point, the data indicated by cross-hatching in FIG.

When the writing of the head data of each track of track numbers 2, 3, 4, and 5 to the special area of the memory means 4 is completed, the data of the track of track number 1 is written to the normal area of the memory means 4 again. To a + m + 1
Resume from the recording position of. Thereafter, the reproduction operation of the track with the track number 1 is continued.

As shown in FIG. 13, when the skip reproduction to the track of track number 3 is instructed during the reproduction and output of the track of track number 1, the system control means 8 immediately shifts from the normal area of the memory means 4. Of the track with the track number 1 is stopped from the reproduction output means 5 and the data read from the special area of the memory means 4 is started. Start playback output. At this time, the data storage amount of the memory means 4 is the head data amount n of the track of the track number 3 previously written.
It is.

The system control means 8 starts reproducing and outputting the track of track number 3 and, at the same time, instructs the transfer of the pickup 2 to the recording position of the track of track number 3 on the disk 1. Data c + n + 1 following the head data written in the special area
Subsequent data is written to the normal area of the memory means 4.

Further, when all the head data of the track of track number 3 written to the special area of the memory means 4 is read out to c + n, the system control means 8 determines the track number of the track number 3 to be written to the normal area of the memory means 4. Switching to reading from track data c + n + 1 is performed. Thereafter, the reproduction operation of the track with the track number 3 is continued. Here, the head data amount n of each track written to the special area of the memory means 4 is an access time for transferring the pickup 2 to each track, for example, a data amount corresponding to about 1 second.

As described above, in the above-mentioned conventional example, a special area is provided in a part of the memory means 4, and the head data of the track recorded on the disk 1 is written in the special area by a predetermined amount n in advance. When skip reproduction to another track is instructed by the operation input means 9, first, the head data written in the special area is read out, and at the same time, the pickup 2 is moved to the designated track to transfer the data following the head data. By reproducing the data from the disk 1 and writing the data in the normal area of the memory means 4 and switching the data read from the normal area when all the head data is read, the head search can be realized immediately without waiting for the access time.

[0032]

In the above conventional example, the head data of the track recorded on the disk 1 is written into the special area of the memory means 4 by a predetermined amount n each.
Assuming that the predetermined amount n is a data amount sufficient for the pickup 2 to access the farthest track on the disk 1, a large amount of data is required in the special area of the memory means 4. Also, if the data amount of the predetermined amount n is small, the access to the desired track cannot be completed by the pickup 2 when the head data written in the special area of the memory means 4 has been read out, so that the mute process is required and the intermittent operation is preferably performed. However, there is a problem that reproduction cannot be performed smoothly (that is, reproduction cannot be performed without interruption of sound).

Accordingly, it is an object of the present invention to provide a disk reproducing apparatus capable of immediately searching for a start without skipping a pickup access time during skip reproduction without increasing a memory capacity for writing head data of each track. It is to provide.

[0034]

According to a first aspect of the present invention, there is provided a disk reproducing apparatus comprising: a disk on which a plurality of tracks are recorded; and a pickup for reproducing a signal of a desired track from the disk. A pickup transfer means for transferring a pickup, a reproduction demodulation means for demodulating a signal of a desired track reproduced from the pickup, and a memory means for intermittently writing data demodulated by the reproduction demodulation means in a normal data area; Reproduction output means for demodulating and outputting data continuously read from the memory means, memory control means for controlling the memory means,
Operation input means for instructing a reproduction operation of a disk, and system control means for instructing writing and reading of the memory means in accordance with the amount of data stored in the memory means, and instructing transfer of a pickup in accordance with a reproduction instruction of the operation input means And

The memory means has a special area in which data can be separately written in addition to the normal data area. The system control means writes the data of the desired track to the normal data area of the memory means. During the suspension, the pickup is moved to write a predetermined amount of head data of a track other than the desired track into a special area of the memory means by a predetermined amount, and a reproduction instruction of another track different from the desired track is transmitted from the operation input means. When this is done, the head data of the designated track among the head data of the other tracks written in the special area of the memory means is read, and the pickup is moved to the specified track of the disk to be written to the special area of the memory means. Data following the head data of the indicated track When all of the head data of the designated track written in the special area of the memory means is read out, the data written in the normal data area of the memory means is continuously read out, and the continuity of data from the desired track on the disk is read. Maintain a different track to play.

Further, the disc reproducing apparatus includes a track number managing means for managing track numbers recorded on the disc, and the track number managing means stores a track number of data written in a normal area of the memory means. The system control means compares the track number of the head data to be written to the special area of the memory means with the track number of the head data to be written to the special area of the memory means when the track number difference compared by the track number management means is small. When the track number difference is large, the write amount of the leading data is increased.

According to the configuration of the first aspect of the present invention, a special area is provided in a part of the memory means, and head data of a track recorded on the disk is written in the special area in advance, and the track number management means The track number of the data written to the normal area of the memory means is compared with the track number of the first data to be written to the special area. When the track number difference compared by the track number management means is small, the special area is determined. When the track number difference is large, the write amount of the head data is increased, and the write amount of the head data is increased, so that the data amount of the special area is not increased, and the access time of the pickup during skip reproduction is not waited. You can find the head immediately.

A disk reproducing apparatus according to a second aspect of the present invention includes a recording position managing means instead of the track number managing means having the structure of the first aspect of the present invention, and the recording position managing means moves to a normal area of the memory means. The system control means compares the recording position of the last written data with the recording position of the first data to be written to the special area of the memory means,
When the recording position difference compared by the recording position management unit is small, the amount of writing of the leading data to be written to the special area of the memory unit is reduced, and when the recording position difference is large, the amount of writing of the leading data is increased.

According to the configuration of the second aspect of the present invention, a special area is provided in a part of the memory means, and the head data of the track recorded on the disk is written in the special area in advance. The recording position of the last data written in the normal area of the memory means is compared with the recording position of the first data written in the special area. If the recording position difference compared by the recording position management means is small, a special Tracks recorded on the disc are not recorded in the order of track numbers from the inner circumference to the outer circumference by reducing the amount of head data to be written to the area and increasing the amount of head data when the recording position difference is large. In this case, the pickup access time is not required during skip playback without increasing the data amount in the special area. Immediately be able to put my head without.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the structure of a disk reproducing apparatus according to the first embodiment of the present invention, FIG. 2 is a schematic diagram showing the structure of a disk according to the first embodiment of the present invention, and FIG. FIG. 2 is a schematic diagram illustrating a configuration of an earthquake-resistant memory according to the first embodiment of the present invention. In FIG. 1, components having the same configuration and operation as those of the block diagram in the conventional example of FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1, the disc reproducing apparatus has a track number managing means 10 for managing track numbers of tracks recorded on the disc 1 added to the configuration of the conventional example. This track number management means 10
Is TOC (Table of Contents) information recorded in advance in a lead-in area of the disc 1 (not shown) or UTOC (User Table of Co
Based on UTOC information (see Nikkei Electronics No. 535 or the like) recorded by the user in the area, data is written to the normal area of the memory means 4 and the track number and the memory means reproduced and output from the reproduction output means 5 The track number of the first data to be written to the special area No. 4 is compared. When the track number difference compared by the track number management means 10 is small, the system control means 8 reduces the amount of leading data to be written to the memory means 4,
When the track number difference is large, the write amount of the leading data is increased.

Next, the operation of writing the leading data in the special area of the memory means 4 will be described in detail.

As shown in FIG. 2, the disc 1 is recorded in the order of track numbers 1, 2, 3, 4, and 5 from the inner circumference to the outer circumference, and the recording start positions are a, b, c, and
d and e. The operation timing of writing the leading data to the special area of the memory means 4 is the same as that of the conventional example shown in FIG. 11, and the writing of the data of the track with the track number 1 to the normal area of the memory means 4 is stopped at the recording position of a + m. During this period, the head data of each track of track numbers 2, 3, 4, and 5 is written to the special area of the memory means 4. The difference from the conventional example is that the write amount of the leading data to be written to the special area of the memory means 4 is increased or decreased by the track number.

In the first embodiment of the present invention, when the track number difference compared by the track number management means 10 is small, the system control means 8 reduces the amount of head data to be written to the memory means 4, When the track number difference is large, the write amount of the leading data is increased. Therefore,
The write amount of the head data of each track increases in the order of track numbers 2, 3, 4, and 5. That is, assuming that the write amounts of the head data of the tracks of track numbers 2, 3, 4, and 5 are n1, n2, n3, and n4, respectively, the following relationship is established. (Equation 1) According to n1 <n2 <n3 <n4, when the writing of the head data of the track recorded on the disk 1 to the special area of the memory means 4 is completed, the data shown by cross-hatching in FIG. It is written in the memory means 4.

The structure of the memory means 4 is shown in FIG.
As shown in the figure, the data of the track of track number 1 is written to the normal area up to a + m, and the leading data of the tracks of track numbers 2, 3, 4, and 5 are written to the special area by n1, n2, n3, and n4, respectively. Have been. When the writing of the head data of each of the track numbers 2, 3, 4, and 5 to the special area of the memory means 4 is completed, the data of the track of track number 1 is again written to the normal area of the memory means 4 as in the conventional example. Is resumed from the recording position of a + m + 1, and the reproduction operation of the track of track number 1 is continued thereafter. Further, the operation timing when the skip reproduction to the track of track number 3 is instructed during the reproduction output of the track of track number 1 by the operation input means 9 is the same as that of the conventional example shown in FIG.

As described above, according to this embodiment,
A special area is provided in a part of the memory means 4, and the head data of each track recorded on the disk 1 is previously written in this special area, and the track number management means 10 is written in the normal area of the memory means 4. The system control means 8 compares the track number of the data stored in the special area with the track number of the first data to be written to the special area, and when the track number difference compared by the track number management means 10 is small, the amount of the first data to be written to the special area. When the difference between the track numbers is large, the write amount of the head data is increased, so that the pickup is performed when the skip reproduction to another track is instructed by the operation input means 9 without increasing the data amount of the special area. Without waiting for access time.

This embodiment is particularly effective when recording is performed in the order of track numbers from the inner periphery to the outer periphery of the disk 1 such as a read-only disk.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a block diagram showing a configuration of a disk reproducing apparatus according to the second embodiment of the present invention. FIG.
FIG. 4 is a schematic diagram showing a configuration of a disc according to a second embodiment of the present invention. FIG. 6 is a timing chart of writing the leading data in the second embodiment of the present invention. FIG. 6 shows a time change of the data accumulation amount, a corresponding reproduction output operation (No. 1 reproduction output), and FIG. Disc playback operation (standby, playback) and servo operation (playback, NO.4 access,
NO. 3 access, NO. 5 access, NO. 2 access, NO. 1 access). FIG. 7 is a schematic diagram showing a configuration of the seismic memory according to the second embodiment of the present invention. In FIG. 4, components performing the same configuration and operation as those of the block diagram in the conventional example of FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.

In a rewritable disk, it cannot be said that data is recorded in the order of track numbers from the inner circumference to the outer circumference of the disk 1. This embodiment is particularly effective when recording is not performed in the order of track numbers from the inner circumference to the outer circumference of the disk 1 such as a rewritable disk.

As shown in FIG. 4, this disk reproducing apparatus is obtained by adding a recording position management means 11 for managing the recording positions of the tracks recorded on the disk 1 to the configuration of the conventional example. This recording position management means 11 stores TOC information previously recorded in a lead-in area of the disc 1 (not shown) or UTOC information recorded by a user in a UTOC area of the disc 1 (see Nikkei Electronics No. 535 or the like). Is compared with the recording position of the last data written in the normal area of the memory means 4 and the recording position of the first data written in the special area of the memory means 4. When the recording position difference compared by the recording position management unit 11 is small, the system control unit 8 reduces the amount of leading data to be written to the memory unit 4,
When the track number difference is large, the write amount of the leading data is increased.

Next, the operation of writing the leading data in the special area of the memory means 4 will be described in detail.

As shown in FIG. 5, the disc 1 is recorded in the order of track numbers 1, 4, 3, 5, and 2 from the inner circumference to the outer circumference, and the respective recording start positions are a, b, c, and
d and e.

As shown in FIG. 6, the system control means 8 writes the compressed audio data of the track of track number 1 when the data storage amount in the normal area of the memory means 4 becomes greater than or equal to the second comparison value and records a + m. During the stop at the position, the transfer of the pickup 2 to the recording start position b of the track of the track number 4 recorded at the closest position of the disk 1 is instructed, and when the access is completed, the special area of the memory means 4 is designated. The head data of the track of track number 4 is written to Similarly, the head data of the tracks of track numbers 3, 5 and 2 are also written in the special area of the memory means 4 in the order in which the recording positions of the disk 1 are close.

The second embodiment is different from the first embodiment in that the amount of head data to be written into the special area of the memory means 4 is increased or decreased according to the recording position of the disk 1. In the second embodiment of the present invention, when the recording position difference compared by the recording position managing unit 11 is small, the system control unit 8 reduces the write amount of the leading data to be written to the memory unit 4 and reduces the track number difference. Is larger, the write amount of the leading data is increased. Therefore, the write amount of the head data of each track increases in the order of the track numbers 4, 3, 5, and 2. Track number 4,
Assuming that the write amounts of the head data of the tracks 3, 5, and 2 are x1, x2, x3, and x4, respectively, the following relationship is provided. (Equation 2) x1 <x2 <x3 <x4 Therefore, when the writing of the head data of each track recorded on the disk 1 to the special area of the memory means 4 is completed, the data shown by cross-hatching in FIG. Has been written to the memory means.

As shown in FIG. 7, the structure of the memory means 4 is such that the data of the track with the track number 1 is written to the normal area up to a + m, and the respective tracks of the track numbers 4, 3, 5 and 2 are written into the special area. Is x1,
x2, x3, and x4 are written. Memory means 4
When the writing of the head data of each of the track numbers 4, 3, 5, and 2 to the special area of the memory means 4 is completed, the track number 1 to the normal area of the memory means 4 is again written as in the conventional example.
The writing of the data of the track No. is resumed from the recording position of a + m + 1, and the reproduction operation of the track of the track number 1 is continued thereafter. Further, the operation timing when the skip reproduction to the track of the track number 3 is instructed during the reproduction output of the track of the track number 1 from the operation input means 9 is as follows.
This is the same as FIG. 13 of the conventional example, and the description is omitted.

As described above, according to this embodiment,
A recording position management unit 11 is provided in place of the track number management unit 10 of the configuration of the first embodiment, and the recording position management unit 11 includes a recording position of the final data written in the normal area of the memory unit 4 and a special area. Is compared with the recording position of the leading data to be written to the special area. If the recording position difference compared by the recording position managing means 11 is small, the system control means 8 reduces the amount of leading data to be written to the special area, and When the size is large, the head data write amount is increased, so that even if the tracks recorded on the disc are not recorded in the order of the track numbers from the inner circumference to the outer circumference, skip reproduction without increasing the data amount of the special area Sometimes it is possible to find the position immediately without waiting for the access time of the pickup.

[0059]

According to the first aspect of the present invention, the track number of the data written to the normal area of the memory means is compared with the track number of the first data to be written to the special area. When the difference is small, the write amount of the first data to be written to the special area is reduced, and when the track number difference is large, the write amount of the first data is increased, so that skip reproduction can be performed without increasing the data amount of the special area. Sometimes it is possible to find the position immediately without waiting for the access time of the pickup.

According to the disk reproducing apparatus of the present invention, the recording position of the last data written in the normal area of the memory means is compared with the recording position of the first data written in the special area. When the size is small, the amount of leading data to be written to the special area is reduced, and when the recording position difference is large, the amount of leading data is increased. Even when the data is not recorded in order, it is possible to immediately search for the skip without waiting for the access time of the pickup without increasing the data amount in the special area.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a disc reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a disk according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating a configuration of a seismic memory according to the first embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a disc reproducing apparatus according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a configuration of a disc according to a second embodiment of the present invention.

FIG. 6 is a write timing chart of head data according to the second embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating a configuration of a seismic memory according to a second embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration of a conventional disk reproducing apparatus.

FIG. 9 is a schematic diagram showing a configuration of a disc in a conventional example.

FIG. 10 is a first operation timing chart at the time of a skip reproduction command in a conventional example.

FIG. 11 is a timing chart for writing leading data in a conventional example.

FIG. 12 is a schematic diagram showing a configuration of a conventional earthquake-resistant memory.

FIG. 13 is a second operation timing chart at the time of a skip reproduction command in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 2 Pickup 3 Reproduction / demodulation means 4 Memory means 5 Reproduction output means 6 Memory control means 7 Pickup transfer means 8 System control means 9 Operation input means 10 Track number management means 11 Recording position management means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Kiminori Matsuno 1006, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D044 BC06 CC04 FG10 FG18 GK12 HH05

Claims (2)

[Claims] 1. A disc on which a plurality of tracks are recorded, a pickup for reproducing a signal of a desired track from the disc, a pickup transfer means for transferring the pickup, and a signal of the desired track reproduced from the pickup. Reproduction demodulation means for demodulating, memory means in which data demodulated by the reproduction demodulation means are intermittently written in a normal data area, reproduction output means for demodulating and outputting data continuously read from the memory means, A memory control unit for controlling the memory unit, an operation input unit for instructing a reproduction operation of the disk, and an instruction for writing and reading of the memory unit according to a data storage amount of the memory unit; System control means for instructing the transfer of the pickup according to a reproduction instruction of In the memory means, in addition to the normal data area, a special area in which data can be separately written is prepared, and the system control means stores the data of the desired track in the normal data area of the memory means. While the writing is suspended, the pickup is transported to write a predetermined amount of head data of a track other than the desired track into a special area of the memory means, and the head input data is different from the desired track from the operation input means. When an instruction to reproduce another track is sent, the head data of the indicated track among the head data of the other track written in the special area of the memory means is read, and the pickup is moved to the indicated track of the disk. Of the designated track written in the special area of the memory means. The data following the head data is written to the normal data area of the memory means, and when all the head data of the designated track written to the special area of the memory means is read, the data written to the normal data area of the memory means A disc reproducing apparatus for continuously reading data from the desired track on the disc and reproducing the different track while maintaining continuity of data from the desired track, comprising: a track number managing unit for managing track numbers recorded on the disc. Furthermore, the track number management means compares a track number of data written to a normal area of the memory means with a track number of head data written to a special area of the memory means, and the system control means includes: The track number difference compared by the track number management means is small. A disc reproducing apparatus characterized in that the writing amount of the leading data to be written to the special area of the memory means is reduced at the time, and the writing amount of the leading data is increased when the track number difference is large. 2. A disc on which a plurality of tracks are recorded, a pickup for reproducing a signal of a desired track from the disc, a pickup transfer means for transferring the pickup, and a signal of the desired track reproduced from the pickup. Reproduction demodulation means for demodulating, memory means in which data demodulated by the reproduction demodulation means are intermittently written in a normal data area, reproduction output means for demodulating and outputting data continuously read from the memory means, A memory control unit for controlling the memory unit, an operation input unit for instructing a reproduction operation of the disk, and an instruction for writing and reading of the memory unit according to a data storage amount of the memory unit; System control means for instructing the transfer of the pickup according to a reproduction instruction of In the memory means, in addition to the normal data area, a special area in which data can be separately written is prepared, and the system control means stores the data of the desired track in the normal data area of the memory means. While the writing is suspended, the pickup is transported to write a predetermined amount of head data of a track other than the desired track into a special area of the memory means, and the head input data is different from the desired track from the operation input means. When an instruction to reproduce another track is sent, the head data of the indicated track among the head data of the other track written in the special area of the memory means is read, and the pickup is moved to the indicated track of the disk. Of the designated track written in the special area of the memory means. The data following the head data is written to the normal data area of the memory means, and when all the head data of the designated track written to the special area of the memory means is read, the data written to the normal data area of the memory means A disc reproducing apparatus for continuously reading data from said disc and reproducing said another track while maintaining continuity of data from a desired track on said disc, wherein a recording position managing means for managing a recording position of a track recorded on said disc The recording position management means,
The recording position of the last data written in the normal area of the memory means is compared with the recording position of the leading data written in the special area of the memory means, and the system control means is compared by the recording position management means. A disk reproducing apparatus characterized in that when the recording position difference is small, the amount of head data written to the special area of the memory means is reduced, and when the recording position difference is large, the amount of head data writing is increased.