JP3117425B2 - Disk playback device - Google Patents

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 and outputting information recorded on a disk-shaped recording medium.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing a conventional disk reproduction, and FIG. 10 is a block diagram showing a digital signal processing circuit in FIG.

In FIG. 9, reference numeral 200 denotes a normal disk reproducing apparatus. 1 is a compact disc as a record carrier. The compact disc 1 is rotated by a spindle motor 11 and data recorded on the disc is taken out by an optical pickup 10.

An analog waveform shaping circuit 21 shapes the waveform of an analog reproduction signal supplied from the optical pickup 10 and binarizes the signal. The binary data obtained in this manner is supplied to the digital signal processing circuit 22.

As shown in FIG. 10, the digital signal processing circuit 22 includes a synchronization detection circuit 41, a PLL circuit 42, a demodulation circuit 43, a crystal oscillation circuit 44, a subcoding detection circuit 45, and a RAM 46.

In FIG. 10, a synchronization detecting circuit 41 detects frame synchronization from the applied binary data.
The PLL (Phase Locked Loop) circuit 42 reproduces a clock from the given binary data.

The demodulation circuit 43 takes in a digital signal from the synchronization detection circuit 41 and outputs a CIRC (Cross Interleave) signal.
Error detection and correction by eReed-Solomon Code) are performed, and digital audio data 58 or digital program data 59 is output by a reproduction timing signal supplied from the crystal oscillation circuit 44.

[0008] The sub-coding detection circuit 45 reproduces disk address information 51 and the like for performing track positioning. The RAM 46 functions as a buffer for CIRC deinterleaving and error correction.

In FIG. 9, reference numeral 20 denotes a servo circuit, which is two types of clocks supplied from the digital signal processing circuit 22 (a reference clock output from the crystal oscillation circuit 44 and a reproduced clock output from the PLL circuit 42).
Is controlled so that the rotation speed of the spindle motor 11 matches the reference clock. Further, based on an access control signal 53 given from the access control device 23,
The slide motor 12 and the optical pickup 10 are controlled.

[0010] The access control device 23 has a disk address information 51 provided from the digital signal processing circuit 22.
Of the slide motor 12 via the servo circuit 20 based on the
Then, the optical pickup 10 is controlled to perform track positioning.

Reference numeral 24 denotes a D / A conversion circuit, which converts the digital audio data 58 output from the digital signal processing circuit 22 into an analog audio signal 155 and outputs it. In addition,
Related devices of this type include, for example, JP-A-2-158965 and JP-A-2-143922.

[0012]

In general, data includes data that requires a higher data transfer speed, such as program data, and data that requires a predetermined data transfer speed, such as audio data and video data. If there is, each other and these program data or the like and the audio data, to may have been recorded on separate disks 1, the same de
It may be recorded on disk 1.

[0013] The above-described conventional example, the data transfer speed of disk
Since the rotation speed of the disk 1 is determined by the rotation speed of the disk 1, if the rotation speed of the disk 1 is set to a rotation speed suitable for the data transfer speed of the audio data and the video data, there is a problem that the data transfer speed of the program data is reduced. Also, conversely
If the rotation speed of the disk 1 is set to a rotation speed suitable for the data transfer speed of the program data, the data transfer speed of the audio data and the video data becomes higher than a predetermined data transfer speed, and normal audio and video cannot be obtained. There was a problem.

[0014] It is an object of the present invention to provide a sound recording apparatus for recording on a disc
Processing such as compression is applied to voice data or video data
Also, the disk rotation speed can be measured using data such as program data.
Set the rotation speed suitable for the transfer speed, and
Data at a specified data transfer rate.
To provide a disk reproducing apparatus. The day
Compression of audio data, video data, etc.
The disk rotation speed can be programmed even if the
Rotation speed suitable for data transfer speed of ram data, etc.
Outputs audio data, video data, etc. at a predetermined data transfer rate.
Providing a disc player that can be powered
It is in.

[0015]

In order to achieve the above-mentioned object, in a disk reproducing apparatus according to the present invention, compressed first information suitable for a first transfer speed and a first information compressed faster than the first transfer speed are provided. Disc reproducing means for reproducing second information suitable for a second transfer speed at the second transfer speed ; memory means for storing information reproduced from the disc reproducing means; and transferring the information to the memory means. It has a memory control means for controlling the input and output of the memory means so as to input intermittently when storing and to output continuously when reading out, and a means for expanding compressed information .

The first information is stored in the memory controller.
Output at said first transfer rate via a stage, expanding means
And outputs the second information at the second transfer rate.
It is characterized by doing.

Further, in the disk reproducing apparatus according to the present invention ,
Compressed information including first information suitable for a first transfer rate
And uncompressed information, faster than the first transfer rate
And second information suitable for a second transfer rate.
A disk reproducing means for reproducing at a feeding speed; a memory means for storing information reproduced from the disk reproducing means; an intermittent input when storing the information in the memory means, and a continuous output when reading the information. a memory control means for controlling input and output of said memory means so as to, compressed information
Is provided.

The first information is compressed information.
At some point, the decompression process is performed, and the first information is the first transfer speed.
And the second information is output at a second transfer rate.
It is characterized by the following.

[0019]

According to the present invention, the rotational speed of the disk is programmed.
Rotation speed suitable for data transfer speed of ram data etc.
Data that has been processed on the disc, such as compression,
Even if digital data is played at high speed, audio data and video
For image data etc., once via the buffer RAM,
Further, by performing arithmetic processing such as decompression, a predetermined
It can be output at the data transfer speed. Therefore,
Improve the data transfer speed of program data, etc., and
The data transfer speed of audio data and video data
Output at a specified data transfer rate, regardless of processing
To obtain normal audio and video
Can be.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 is a block diagram showing a digital signal processing circuit in FIG.

In FIG. 1, reference numeral 100 denotes a high-speed disk reproducing device, which is twice (1.5 times, 3 times, 4 times) the data transfer speed required by a general compact disk reproducing device.
Data can be reproduced at a speed as fast as possible.

Reference numeral 1 denotes a compact disc as a record carrier. This compact disc 1 is driven at a standard speed (linear speed of 1.2 to 1.4 m /
(sec) (at a linear velocity of 2.4 to 2.8 m / sec). 11
Numeral 0 denotes an optical pickup for extracting data recorded on the compact disk 1 as an analog reproduction signal.

Reference numeral 121 denotes an analog waveform shaping circuit which shapes an analog signal input from the optical pickup 110 and binarizes the analog signal. The double-speed binary data obtained by the waveform shaping performed by the analog waveform shaping circuit 121 in this manner is converted into the digital signal processing circuit 12.
2 is output.

The digital signal processing circuit 122 outputs double-speed digital program data 159 or double-speed digital audio data 158 to the buffer RAM 130. Note that the digital signal processing circuit 122
As shown in the figure, the synchronization detection circuit 141, the PLL circuit 142,
It comprises a demodulation circuit 143, a double-speed crystal oscillation circuit 144, a sub-coding detection circuit 145, and a RAM 146.
Details of 141 to 146 will be described later.

Reference numeral 120 denotes a servo circuit which controls the rotation speed of the spindle motor 111 based on two types of clocks supplied from the digital signal processing circuit 122.
In addition, based on an access control signal 153 given from the access control device 123, the slide motor 112 and the optical pickup 110 are controlled.

The access control device 123 controls the slide motor 112 and the optical pickup 110 via the servo circuit 120 based on the disk address information 151 given from the digital signal processing circuit 122 to perform track positioning. The details of the control operation of the access control device 123 will be described later with reference to FIG.

The buffer RAM 130 stores the double speed digital audio data 158 output from the digital signal processing circuit 122, and stores the normal speed digital audio data 1
55 is output to the D / A conversion circuit 124.

The D / A conversion circuit 124 includes a buffer RAM
The digital audio data 155 output from 130 is converted into an analog audio signal 154 and output. This analog audio signal 154 may be either stereo or monaural.

Reference numeral 132 denotes a RAM control device which controls input / output timing and addresses of the buffer RAM 130. Details of the control operation of the RAM control device 132 will be described later with reference to FIG.

The details of the digital signal processing circuit 122 will be described below with reference to FIG. In FIG. 2, a synchronization detection circuit 141 detects frame synchronization from the input binary data.

The PLL circuit 142 reproduces a clock from the input binary data. The demodulation circuit 143 takes in the digital signal from the synchronization detection circuit 141,
146 using CIRC deinterleaving and CI
Error detection and correction by RC are performed. Further, it outputs double-speed digital program data 159 or double-speed digital audio data 158 according to a reproduction timing signal provided from the double-speed crystal oscillation circuit 144.

Hereinafter, the control operation of the access control device 123 will be described in detail with reference to FIG. FIG. 3 is an explanatory diagram for explaining a control operation of the access control device of FIG.

FIG. 3A shows the tracks on the compact disk 1 over three rounds (tracks N to N + 2). Although not shown, the track continues as [N + 2] [N + 3] [N + 4]. In addition,
For example, [N] indicates data of track [N].

(B) to (d) show the trajectories of the laser beam irradiated by the optical pickup 110 on the compact disc 1 respectively. (B) is a control at the time of reproduction in the case of the conventional example in which the compact disc 1 is rotating at a normal speed.

FIG. 7C shows control at the time of reproducing audio data in the present embodiment. In this embodiment, the number of rotations of the compact disc 1 is twice the normal number, and the track jumps to the inner circumference by one track at the points A, B, and C. It is during the period of a, c, and e that data is actually reproduced, and b,
The periods d and f are waiting times (normal data transfer mode).

FIG. 4D shows control at the time of high-speed reproduction of program data and the like in this embodiment. In this case, by performing continuous reproduction without performing a track jump, the data transfer speed is doubled as usual (high-speed data transfer mode).

Here, the case where the compact disc 1 is rotating at double speed has been described,
Double speed (linear velocity: 4.8 m / sec to 5.6 m / sec) is also possible. Access control device 123 for triple speed
The control operation will be described in detail with reference to FIG.

FIG. 4 is an explanatory diagram for explaining the control operation of the access control device in the case of triple speed. FIG. 4B shows control during reproduction in the case of the conventional example in which the compact disc 1 is rotating at a normal speed.

(C) shows the control at the time of reproducing the audio data in this embodiment. In this embodiment, the number of rotations of the compact disc 1 is three times that of a normal (conventional example).
At the points A, B, C, D, E, and F, the track jumps to the inner circumference by one track. To actually play the data,
The periods a, d, and g are waiting periods, and the periods b, c, e, f, h, and i are waiting times (normal data transfer mode).

(D) shows the control at the time of high-speed data reproduction in this embodiment. In this case, by performing continuous reproduction without performing a track jump, the data transfer speed becomes three times the normal speed (high-speed data transfer mode).

Hereinafter, the control operation of the RAM control device 132 will be described in detail with reference to FIG. FIG. 5 is an explanatory diagram for explaining a control operation of the RAM control device of FIG.

FIG. 5 (a) shows three tracks (tracks N to N + 2) on the compact disc 1 over the track. (B) shows the input of the buffer RAM 130, that is, the double-speed digital audio data 158.
(C) shows the output of the buffer RAM 130 and the digital audio data 155.

The double-speed digital voice data 158 is intermittently input, and the normal-speed digital voice data 155 is continuously output. Although the present embodiment described above is based on the assumption that audio signals are handled, the same control can be performed when video signals are handled.

With the above configuration, in this embodiment,
There is an effect that audio data can be reproduced while keeping the rotation speed of the compact disc 1 high. Also,
Clock and buffer RA of high-speed disk playback device 100
There is an effect that the clock of M130 and the D / A conversion circuit 124 can be made asynchronous.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram showing a second embodiment of the present invention. In FIG. 6, a high-speed disc reproducing apparatus 1
00 and the buffer RAM 130 are the same as those in the first embodiment, and a description thereof will be omitted.

In this embodiment, however, the digital signal processing circuit 122 outputs the double-speed digital audio data 15
8. In addition to the double-speed digital program data 159,
The double-speed digital mixed data 160 may be output in place of the double-speed digital program data 159. Here, the double-speed digital mixed data 160 is data in which program data and compressed audio data are mixed by interleaving.

Reference numeral 131 denotes a buffer RAM, which is a double-speed digital mixed data 1 from the digital signal processing circuit 122.
When 60 is output, the double speed digital mixed data 160 is stored, and the normal speed digital data 157 is output to the arithmetic circuit 225.

The arithmetic circuit 225 separates the digital mixed data 157 output from the buffer RAM 131 into program data and compressed audio data by arithmetic processing, outputs the program data as digital program data 161 and compresses it. The expanded audio data is expanded and output as digital audio data 162.

The D / A conversion circuit 224 includes an arithmetic circuit 225
If the digital audio data 162 has been output from the, the digital audio data 162 is converted into an analog audio signal and output as an analog audio signal 154.

With the above configuration, in this embodiment,
The same effects as in the first embodiment can be obtained, and even when audio data is subjected to processing such as compression, it can be output after performing arithmetic processing such as decompression. Also,
Clock and buffer RA of high-speed disk playback device 100
There is an effect that the clocks of M130, 131, D / A conversion circuit 224 and arithmetic circuit 225 can be made asynchronous.

Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a block diagram showing a third embodiment of the present invention. In FIG. 7, the normal disk reproducing apparatus 200 is equivalent to the conventional example, and does not support high speed.

In this embodiment, however, the digital signal processing circuit 22 outputs digital mixed data 60 in place of the digital program data 59 in addition to the digital audio data 58 and the digital program data 59. is there. Here, the digital mixed data 60 is data in which program data and compressed audio data are mixed by interleaving. Also, the D / A conversion circuit 224 and the arithmetic circuit 225 are the same as in the second embodiment, and differ from the second embodiment in that the clock is slightly slower than the clock of the normal disk reproducing device 200.

Reference numeral 230 denotes a buffer RAM, which stores the digital audio data 58 when the digital audio data 58 is output from the digital signal processing circuit 22, and converts the digital audio data 255 having a transfer speed lower than the normal speed into D / A. Output to the conversion circuit 224. Since the transfer rate of digital audio data 255 is slightly lower than the transfer rate of digital audio data 58, buffer RA
M230 will never be empty and audio will not be interrupted.

Reference numeral 231 denotes a buffer RAM which stores the digital mixed data 60 when the digital mixed data 60 is output from the digital signal processing circuit 22 and converts the digital mixed data 257 having a transfer speed lower than the normal speed into an arithmetic circuit 225. Output to

The arithmetic circuit 225 separates the digital mixed data 257 output from the buffer RAM 231 into program data and compressed audio data by arithmetic processing, outputs the program data as digital program data 261 and compresses the data. The expanded audio data is expanded and output as digital audio data 262.

The D / A conversion circuit 224 includes an arithmetic circuit 225
If the digital audio data 262 is output from the digital audio data 262, the digital audio data 262 is converted into an analog audio signal and output as an analog audio signal 254.
Since the transfer speed of the digital mixed data 257 is slightly lower than the transfer speed of the digital mixed data 60, the sound is not interrupted.

Hereinafter, the control operation of the RAM control device 232 will be described in detail with reference to FIG. FIG. 8 is an explanatory diagram for explaining a control operation of the RAM control device of FIG.

FIG. 8A shows three tracks (tracks N to N + 2) on the compact disk 1 over the tracks. (B) shows the input of the buffer RAM 230, that is, the digital audio data 58, and (c)
Indicates the output of the buffer RAM 230 and the digital audio data 255.

Since the transfer speed of the digital voice data 255 is slightly lower than the transfer speed of the digital voice data 58, the buffer RAM 230 does not become empty, and conversely, the data of the transfer speed difference gradually increases, and finally. Means that the buffer RAM 230 is full. At this time, the input to the buffer RAM 230 is stopped, and jumping to the inner circumference of one track is performed by access control. During this time, the digital audio data 255 is always output, so that the buffer RA
From M230, data for one track is reduced. When the buffer RAM 230 becomes full again, the same operation is repeated.

The RAM control device 232 includes a buffer RAM
The same control is performed for 231 as well. Note that the clock of the D / A conversion circuit 224 and the arithmetic circuit 225 is 0.05% of the clock of the normal disc reproducing apparatus 200.
It is enough to slow it down. Even if the accuracy and temperature characteristics of the crystal oscillator are taken into account, it does not always exceed the clock of the normal disk reproducing device. Also, the discrimination limit of the pitch based on human hearing is. It is said to be 0.1%, and there is no practical problem even if the reproduction clock of the audio data is delayed by about 0.05%.

[0061]

Since the present invention is configured as described above, it has the following effects.

That is, the rotation speed of the disk is set to a rotation speed suitable for the data transfer speed of program data and the like,
Even if the digital data recorded on the disc and subjected to processing such as compression is reproduced at a high speed, audio data and video data are temporarily passed through the buffer RAM.
Can be output at a predetermined data transfer rate by performing arithmetic processing such as decompression . Therefore, the data transfer speed of program data and the like is improved, and the data transfer speed of audio data and video data is reduced by processing such as compression.
Irrespective of the presence or absence of the data, it is possible to output at a predetermined data transfer rate , so that normal audio and video can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing the digital signal processing circuit of FIG. 1;

FIG. 3 is an explanatory diagram for explaining a control operation of the access control device of FIG. 1;

FIG. 4 is an explanatory diagram for explaining a control operation of the access control device in the case of triple speed.

FIG. 5 is an explanatory diagram for explaining a control operation of the RAM control device in FIG. 1;

FIG. 6 is a block diagram showing a second embodiment of the present invention.

FIG. 7 is a block diagram showing a third embodiment of the present invention.

FIG. 8 is an explanatory diagram for explaining a control operation of the RAM control device in FIG. 7;

FIG. 9 is a block diagram showing a conventional disk reproduction.

FIG. 10 is a block diagram showing a digital signal processing circuit in FIG. 9;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compact disk, 10, 110 ... Optical pickup, 11, 111 ... Spindle motor, 12, 112 ...
Slide motor, 20, 120 ... servo circuit, 21, 1
21: Waveform shaping circuit, 22, 122: Digital signal processing circuit, 23, 123: Access control device, 100: High-speed disk reproducing device, 124, 224: D / A conversion circuit, 130, 131, 230, 231: Buffer RA
M, 132, 232: RAM control device, 200: normal disk reproducing device.

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masashi Mori 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi Video Engineering Co., Ltd. (56) References JP-A-3-34156 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) G11B 20/10 321

Claims (2)

(57) [Claims] 1. A compressed first data rate suitable for a first data rate.
Disc reproducing means for reproducing at a second transfer speed the second information suitable for a second transfer speed higher than the first transfer speed, and storing information reproduced from the disc reproducing means. Memory means for controlling the input and output of the memory means so as to input intermittently when storing the information in the memory means and to output continuously when reading out the information; The first information is stored in the memory control unit,
A disk reproducing apparatus for outputting at the first transfer speed via means and outputting the second information at the second transfer speed. 2. The method according to claim 1, further comprising: first information suitable for the first transfer rate.
Compressed information, uncompressed information, and the first
Second information suitable for a second transfer rate higher than the transfer rate;
Disk playback means for playing back at the second transfer speed;
Memory means for storing information reproduced from the disk reproducing means; and input and output of the memory means such that the information is intermittently input when the information is stored in the memory means and output continuously when the information is read out. Memory control means for controlling;
Means for decompressing the compressed information, wherein the first information
When is the compressed information, the decompression process is performed, and the first information
Is the first transfer rate, and the second information is the second transfer rate.
A disc reproducing apparatus for outputting at a feed speed .