JPH087484A - Disk player - Google Patents

Abstract

PURPOSE:To provide a disk player capable of eliminating a sound break at the time of disk exchange even when memory storage capacity is less. CONSTITUTION:Recording information recorded on a disk 1 is read out at a high speed of prescribed times as high as that of regular reproduction. Then, the recording information is written in a memory 8 at the speed of prescribed times of a regular reproduction speed until the fact that the recording information read out from the disk 1 is the recording information before the prescribed time of the total performance time of the disk 1 is detected, and the recording information after the prescribed time is compressed by a compression circuit 6 to be written in the memory 8 at the prescribed times speed. Then, the recording information is read out from the memory 8 at the speed based on the regular reproduction speed in parallel with the write. The disk exchange is started by a disk exchanger 13 from when the recording information read out from the disk 1 is the recording information in the total performance time of the disk 1, and when the recording information read out from the memory 8 is the compressed recording information, the recording information is expanded by an expansion circuit 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player provided with a disc exchanging device, and more particularly to a disc player capable of reproducing without interruption even during disc exchanging.

[0002]

2. Description of the Related Art In a conventional disc player of this type, since it takes time to finish the mounting of the next disc after the end of the reproduction of one disc, in order to eliminate the interruption of sound even during the exchange of the disc. The recording information recorded on the disc is once written to the storage device, and during the disc replacement, the recording information written to the storage device is read and reproduced so that the sound interruption during the disc replacement is eliminated. ing.

As one example thereof, as disclosed in Japanese Patent Laid-Open No. 3-35474, a storage device for storing the record information read from the disc is provided, and high speed is maintained for a predetermined time from the start of reading the record information from the disc. Drive the disc to read the record information from the disc, write the read record information to the storage device, read the record information stored in the storage device at a speed based on the normal playback speed, and play back the recorded information. During the period from the passage of time to the end of reproduction, the disc is driven at a normal speed to read the record information from the disc, the read record information is written to the storage device, and the record information stored in the storage device is based on the normal reproduction speed. By reading and playing at a fast speed,
The recording signal for the time required for disc exchange is stored in the storage device, and the recorded information of the disc before exchange read out from the storage device during disc exchange is reproduced to prevent sound interruption during disc exchange. .

On the other hand, as described in Japanese Unexamined Patent Publication (Kokai) No. 5-282787, in order to prevent the progress of writing to the shock proof memory when a track jump frequently occurs or a large track jump occurs. , Normal writing and reading of the record information recorded on the disc according to the rate of occurrence of track jumps while reading the record information of the disc, and compression and extension of the write and read of the record information, Something to switch to is suggested.

[0005]

However, there is no conventional method of compressing the recorded information and writing it in the storage device in order to eliminate the sound interruption during the disc exchange. In the above-mentioned conventional art, the sound interruption during the disc exchange is performed. In order to eliminate the problem, there is a problem that the storage capacity of the storage device becomes extremely large.

It is an object of the present invention to provide a disc player capable of eliminating the interruption of sound when the disc is exchanged even if the storage capacity of the memory is small.

[0007]

DISCLOSURE OF THE INVENTION A disc player of the present invention is a disc player equipped with a disc exchanging device, and a memory for storing recording information read from the disc, and a compression means for compressing the recording information read from the disc. Decompressing means for decompressing compressed record information, reading means for reading record information recorded on the disc at a speed which is a predetermined times faster than normal reproduction, and record information read from the disc is the total playing time of the disc. First detection means for detecting that the information is recorded information before a predetermined time,
The recording information read from the disk is detected by the reading means and second detection means for detecting that the recording information is the recording information at the end of the total playing time of the disk, and issuing a disk replacement start instruction based on the detection output. The recorded information is read by the first selecting means, which guides the compressed information to the compressing means until the second detecting means detects it, and the reading means reads it by the first detecting means. The recorded information written in the memory is written at a predetermined multiple of the normal reproduction speed into the memory, and the compressed recording information is compressed by the compression means from the time when the detection is made by the first detection means to the time when the detection is made by the second detection means. Is written in the memory at a speed that is a predetermined multiple of the speed based on the normal reproduction speed, and in parallel with the writing, based on the normal reproduction speed from the memory. A memory control means for reading the recorded information at Ku speed, the leads to the decompression unit recording information when the recording information read out from the memory is recorded information that is compressed 2
And a selection means.

[0008]

In the disc player of the present invention, the record information recorded on the disc is read by the reading means at a speed which is a predetermined times higher than that at the time of normal reproduction, and the record information read from the disc indicates the total playing time of the disc. The recording information read by the reading means is written in the memory at the predetermined times the normal reproduction speed until the first detecting means detects that the information is the recording information before the predetermined time, and the detection information is detected by the first detecting means. The recording information compressed by the compression means is written in the memory at a speed that is a predetermined multiple of the speed based on the normal reproduction speed from the time when the recording is performed until the detection by the second detection means, and in parallel with the writing. The recorded information is read from the memory at a speed based on the normal reproduction speed. When the record information read out from the memory is compressed record information, the record information is expanded by the expansion means. As a result, the original record information is restored.

However, since the record information written in the memory during the period from the time when the detection is made by the first detecting means to the time when the detection is made by the second detecting means is the compressed record information, the storage of the memory during this period. Even if the capacity is small, it is equivalent to doubling the storage capacity based on the compression rate, so that a large amount of recorded information can be written with a memory with a small storage capacity. Since the data is read from the disk at a speed based on the normal reproduction speed, it is possible to prevent the occurrence of sound interruption during disk exchange by the disk exchanging device even if the memory has a large storage capacity.

[0010]

The present invention will be described below with reference to examples. FIG.
FIG. 1 is a block diagram showing a configuration of an embodiment of a disc player according to the present invention, and FIG. 1 shows an example of a compact disc player.

Under the control of the servo circuit 4, the disc player 20 of the present embodiment is driven by a motor 2 that rotationally drives the disc 1 at a linear velocity n times faster than the normal linear velocity, and the disc 1 is rotated. The recording information recorded along the track is read from the disc 1 by the optical pickup 3 which is focus-controlled and tracking-controlled under the control of the servo circuit 4. In the disc player 20, the recording information read from the optical pickup 3 is directly sent to the memory 8 via the changeover switch circuit 5 and written in the memory 8 under the control of the memory control circuit 9 or recorded. The information is sent to the compression circuit 4 that compresses the input in cooperation with the companding control unit 14-2, which will be described later, and compressed, and the memory 8 is controlled under the control of the memory control circuit 9.
Write in. Here, writing to the memory 8 is performed at a speed n times as high as that during normal reproduction. The recording information is compressed by, for example, the ADPCM (adaptive differential pulse code modulation) method.

The recording information written in the memory 8 is sequentially read from the memory 8 at a speed based on a normal reproduction speed under the control of the memory control circuit 9 in parallel with the writing in accordance with the writing order, and signal processing is performed. It is supplied to the circuit 7 to perform signal processing such as decoding and error correction. The signal-processed output from the signal processing circuit 7 is supplied to the changeover switch circuit 10 and directly supplied to the D / A converter 12, or the expansion for expanding the input in cooperation with the companding controller 14-2. The signal is supplied to the circuit 11, expanded, supplied to the D / A converter 12, converted into an analog signal, and output.

On the other hand, the disc player 20 is provided with a disc exchanging device 13. The disc exchanging device 13 causes the disc mounted on the disc player 20 to be reproduced next to the disc mounted when the disc 1 being reproduced is completed. It is configured so that the next disk is loaded into the disk player 20 by exchanging the disk with the other disk. When the next disk is loaded, the control circuit 14 described later is used.
Sends a mounting end signal to.

The control circuit 14 is composed of a microcomputer, and functionally controls the servo circuit 4 to control the rotation drive of the motor 2, the focus control of the optical pickup 3, and the tracking control.
1, a compression / expansion control unit 14-2 for controlling the compression of the input data of the compression circuit 6 and the expansion of the input data of the expansion circuit 11 in cooperation with the compression circuit 6 and the expansion circuit 11, and the current performance time information of the disc 1. The compression start time and the switching of the changeover switch circuits 5 and 10 are controlled by referring to the total playing time information of the disc 1 in the menu information recorded in the menu area of the disc 1 to end the total playing time of the disc 1. Based on the completion of reading the record information, a disc exchange start instruction signal is sent to the disc exchanging device 13, and in cooperation with the memory control circuit 9, writing of data including record information to the memory 8 and record information from the memory 8 are performed. Of the disc player 2 based on the signal from the operation key 15 and the mounting end signal from the disc exchanging device 13. To control the system control unit 14-3
It has.

Further, the system control section 14-3 cooperates with the memory control circuit 9 and when the record information is written in the entire storage capacity of the memory 8, the record information read control section 1
4-1 is controlled to stop the rotation of the motor 2 via the servo circuit 4, the movement of the optical pickup 3 is stopped to temporarily stop the writing, and the recording capacity of the memory 8 is adjusted according to the reading of the recording information. When a fixed amount of space is generated, the motor 2 is rotationally driven via the servo circuit 4, focus control and tracking control of the optical pickup 3 are performed, and control is performed to start writing to the memory 8 again.

Here, the motor 2, the optical pickup 3, the servo circuit 4, and the recording information read control unit 14-1 correspond to the reading means, and the compression circuit 6 and the companding control unit 14 are provided.
-2 corresponds to the compression means, and the expansion circuit 11 and the companding control unit 14-2 correspond to the expansion means. The changeover switch circuit 5 is the first selection means, and the changeover switch circuit 10
Corresponds to the second selecting means. System control unit 14-
Part of 3 corresponds to the first and second detection means, and part of the memory control circuit 9 and the system control circuit 14-3 corresponds to the memory control means.

Next, the operation of the disc player 20 of the present embodiment constructed as described above will be described with reference to FIGS. FIG. 2A shows a reading period from the disc 1 of the recording information written in the memory 8, and FIG.
FIG. 3B shows the reproduction time of the record information read from the memory 8, and FIG. 3 shows the amount of record information stored in the memory 8.

When the disc 1 is loaded and the reproduction instruction signal is transmitted from the operation key 15, the system control unit 14
-3, the disc player 20 enters the operating state, and the disc 2 is rotationally driven by the motor 2 via the servo circuit 4 under the control of the recording information read control unit 14-1. The pickup 3 is focus-controlled and tracking-controlled, and the recording information recorded on the disc 1 is read by the optical pickup 3 and converted into an electric signal for output. This period is shown in Figure 2.
The period A is shown in (a).

Under the control of the system controller 14-3 from the start of rotation of the disc 1, during the period A, the changeover switch circuits 5 and 10 are controlled to the changeover position shown in FIG. The record information converted from 3 into an electric signal and transmitted is written in the memory 8 without being compressed. This writing is performed under the control of the memory control circuit 9. The menu information recorded in the menu area of the disc 1 is stored in the menu information storage area of the memory 8. Following this storage, the recording information is sequentially written in the memory 8. This writing is n during normal playback
It is done at double speed. This is because the disk 1 is rotationally driven at a linear velocity that is n times the normal linear velocity.
Writing of recording information to the memory 8 and reading of recording information from the memory 8 are performed under the control of the memory control circuit 9.

In parallel with the writing of the recording information into the memory 8, the recording information written in the memory 8 is sequentially read out at a speed based on the normal reproduction speed in accordance with the writing order, and the signal processing circuit 7 Is subjected to signal processing such as decoding and error correction, is converted into an analog signal in the D / A converter 12, is output, and is reproduced as an audio signal. Therefore, writing to the memory 8 is performed at a speed n times the speed at the time of normal reproduction, and reading from the memory 8 is performed at a speed based on the normal reproduction speed. Therefore, the recorded information amount to be written becomes larger than the stored information amount to be read, and the memory 8
When the recording information is written up to the storage capacity of, the reading of the recording information from the disc 1 is temporarily stopped, the writing is temporarily stopped, and only the reading is performed, and the recording information amount in the memory 8 reaches a predetermined amount. Writing is restarted from when it has dropped to. Therefore, the amount of recorded information in the memory 8 is as shown in FIG. In FIG. 3, F indicates the storage capacity of the memory 8, and α indicates the storage capacity for restarting writing.

Current position information on the track of the optical pickup 3 included in the recording information in the above signal processing in the signal processing circuit 7 (Q in sub-code).
The channel code) is separated, and the current position information and the total playing time information of the disc 1 in the menu information stored in the menu area of the memory 8 are compared, and the current position on the track of the optical pickup 3 is determined as the current position of the disc 1. From the position P0 (see FIG. 2 (a)) corresponding to the total playing time, the time required for disc exchange of the disc exchanging device 13, the ratio n of the linear velocity in the present embodiment to the linear velocity during normal reproduction, and the compression circuit. Position P1 before a predetermined time based on the compression ratio in 6
The system control unit 14-3 checks whether or not the position of the optical pickup 3 has reached (see FIG. 2A).

By the above check, the optical pickup 3
When it is determined that the current position on the track has reached the position P1 before the predetermined time, the system control unit 14
Under the control of -3, the changeover switch circuit 5 is changed over from the position of FIG. 1 to the compression circuit 6 side, and the recording information sent from the optical pickup 3 is guided to the compression circuit 6 and compressed and compressed. The record information is written in the memory 8.
Therefore, from the position P1 to the position P0 in FIG.
In the period shown by the period B in (a), the record information is compressed and written in the memory 8.

When the current position on the track of the optical pickup 3 reaches the position P0 corresponding to the total playing time of the disc 1, the recorded information over the total playing time is recorded on the disc 1.
When it reaches the position P0, the system control unit 14-3 outputs a disk exchange start instruction signal to the disk exchange apparatus 13. Upon receiving the disk exchange start instruction signal, the disk exchange apparatus 13 starts the exchange of the disk 1.

On the other hand, since the recording information is read from the memory 8 based on the speed during normal reproduction, the recording information up to the position P1 is read later than when the position P1 is reached, The uncompressed recording information is completely read out from the memory 8 at the time T2 shown in FIG. 2B. Therefore, the reproduction by the uncompressed recording information is performed over the period indicated by A ′ in FIG. The switching circuit 10 is switched from the position shown in FIG. 1 to the decompression circuit 11 side under the control of the system control unit 14-3 after the reproduction by the uncompressed recorded information is completed.

As a result, the signal continuously output from the signal processing circuit 7 from the time T2 is compressed recording information, which is guided to the decompression circuit 11 and decompressed, and the analog signal is obtained in the D / A converter 12. Is converted to and output.
When the optical pickup 3 reaches the position P0, all the reproduction of the disc 1 is completed, and when the position P0 is reached, the disc 1 is removed by the disc exchanging device 13 and the next disc is mounted on the disc player 20. The time from the time when the optical pickup 3 reaches the position P0 to the time when the mounting of the next disk on the disk player 20 is completed is the exchange time, which is indicated by the period C in FIG. 2A.

However, since the compressed record information is stored in the memory 8 during the period shown by the period B, the record information written is substantially large even if the memory 8 has a small storage capacity. When the compressed recording information written in is read out and the reproduction based on the compression signal is almost completed, the disk exchange is completed, and an attachment end signal is sent from the disk exchange device 13 to the system controller 14-3 at time T3. It The period during which the compressed record information is read and reproduced is shown as period B'in FIG. 2B, and period B'is the period C during disc exchange.
Including, there is no sound break even during the disc replacement.

The system control unit 14 which has received the mounting end signal
Under the control of -3, the changeover switch circuit 5 is changed over to the position of FIG. 1, and the disc player 20 sequentially writes the record information of the next disc from the menu information recorded in the menu area to the memory 8. The switch circuit 10 is switched to the position shown in FIG. 1 after a predetermined time has elapsed, and the record information read from the memory 8 is directly supplied to the D / A converter 12 and reproduced. This regeneration period is indicated by D and D'in FIGS. 2 (a) and 2 (b). In this case, the changeover switch circuit 10 may be changed over at the same time as the changeover switch circuit 5 is changed over.

During the period in which the compressed record information is read from the memory 8 and reproduced, that is, during the period B'in FIG. 2B, the amount of the record information stored in the memory 8 is α or less. However, no data is written to the memory 8. The amount of recording information stored in the memory 8 is as shown in FIG. 3, and no sound break occurs.
In this case, it may be difficult to completely match the playback start of the newly loaded disc with the playback end of the previously loaded disc, but by performing fade-out during playback just before the playback of the disc is completed. The sense of discomfort disappears. Further, by performing fade-in in the reproduction of the reproduction start portion of the new disc, it is possible to make the listener feel comfortable.

[0029]

As described above, according to the disc player of the present invention, in the recorded information read out from the disc at a high speed, the recorded information at a predetermined time before the total playing time of the disc is written into the memory at a high speed. Compress the recorded information after a predetermined time before the total playing time and write it to the memory at high speed, read the recorded information from the memory at a speed based on the normal reproduction speed in parallel with the writing, and decompress the read compressed recorded information. With this configuration, the recording information after a predetermined time before the total playing time of the disc is compressed recording information, and the storage capacity of the memory during this period is at least equivalent to double the storage capacity based on the compression rate. Therefore, a large amount of recorded information can be written with a memory having a small storage capacity, and further writing to the memory is possible. A fast, read from the memory for a fast based on the normal reproduction speed, large even without a memory storage capacity, the effect of preventing that sound interruption during disc replacement by the disc changer occurs is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a disc player according to the present invention.

2A and 2B are diagrams for explaining the operation in one embodiment of the disc player according to the present invention, in which FIG. 2A shows a read period of the recording information written in the memory 8 from the disc 1, and FIG. FIG. 7 is a diagram showing a reproduction time of recorded information read from a memory 8.

FIG. 3 is a schematic diagram showing an amount of recording information stored in a memory in an embodiment of the disc player according to the present invention.

[Explanation of symbols]

 1 disk 2 motor 3 optical pickup 4 servo circuit 5 and 10 changeover switch circuit 6 compression circuit 7 signal processing circuit 8 memory 9 memory control circuit 11 expansion circuit 12 D / A converter 13 disk exchange device 14 control circuit 14-1 recording information Read control unit 14-2 Companding control unit 14-3 System control unit 15 Operation keys 20 Disc player

Claims (1)

[Claims] 1. A disc player equipped with a disc exchange device, a memory for storing recording information read from a disc, a compressing unit for compressing the recording information read from the disc, and an expanding unit for expanding the compressed recording information. Read means for reading the record information recorded on the disc at a speed that is a predetermined times faster than that during normal reproduction; and the record information read from the disc being the record information at a predetermined time before the total playing time of the disc. First detecting means for detecting, and second detecting means for detecting that the record information read from the disc is the record information at the end of the total playing time of the disc and issuing a disc exchange start instruction based on the detection output. And the recording information read by the reading means is detected by the second detecting means from the time when the first detecting means detects the recorded information. First selection means for leading to the compression means until the data is output, and recording information read by the reading means until the detection by the first detection means is written in the memory at the predetermined times the normal reproduction speed. , First
From the time when the detection is made by the detection means to the time when the detection is made by the second detection means, the recording information compressed by the compression means is written and written in the memory at the predetermined times the speed based on the normal reproduction speed. In parallel with this, the memory control means for reading the record information from the memory at a speed based on the normal reproduction speed, and the second selection for guiding the record information to the decompressing means when the record information read from the memory is compressed record information. A disc player comprising means.