JP2000243035A - Optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To output a reference clock by selecting it in accordance with the class of a DVD disk to be reproduced. SOLUTION: By a control means 24, when the disk set in the optical disk reproducing device 100 is judged as it is not the DVD video disk 30 based on the control information inputted from an optical pickup 1, a logic (1) is outputted as a picture clock selecting signal 25 and an audio clock selecting signal 26. In accordance therewith, a picture clock selecting part 12 selects a picture PLL clock producing part 21 and accepts the input. On the other hand, an audio clock selecting part 17 selects an audio reference clock oscillating part 20 and aocepts the input. By the picture clock selecting part 12, the picture PLL clock is outputted to a picture/audio decoding process part 5 as the picture clock, and the audio reference clock is outputted to an audio D/A converting part 10 by the audio clock selecting part 17 as the audio clock.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus for reproducing video / audio information,
The present invention relates to an optical disk reproducing device capable of selecting a reference clock.

[0002]

2. Description of the Related Art FIG.
FIG. 2 is a block diagram showing a configuration of a zero. The conventional optical disc reproducing apparatus 200 includes an optical pickup 1, a digital signal processing section 3, an image / audio decoding processing section 5, an image D / A conversion section 8, an audio D / A conversion section 10, an image reference clock oscillation And an audio PLL clock generator 15. The optical disc reproducing apparatus 200 will be described below as reproducing a DVD disc as an example of an optical disc. The DVD video disk 30 shown in FIG. 3 stores moving image data, audio data, and management information.
The DVD audio disk 31 stores still image data, audio data, and management information. Here, the management information has no direct relation to the operation of the optical disk reproducing device 200 described below. The details of the management information will be described later.

The optical pickup 1 reads moving image data and audio data stored in a DVD video disk 30, or still image data and audio data stored in a DVD audio disk 31. As a result of reading the pit shape of the data recording surface of the disc,
The obtained RF signal 2 is output to the digital signal processing unit 3. The digital signal processing unit 3 converts the input RF signal 2 into digital data 4 and outputs the digital data 4 to the video / audio decoding processing unit 5. The video / audio decoding unit 5 performs a decoding process on the input digital data 4 and outputs the digital data 4 as a digital video signal 6 and a digital voice signal 7.

The video / audio decoding processor 5 receives the video reference clock 13 output from the video reference clock oscillator 14. The image / sound decoding processing unit 5 generates an image synchronization signal based on the input image reference clock 13, and superimposes the image synchronization signal on the digital image signal 6 to output. The image D / A converter 8 converts the digital image signal 6 on which the input image synchronization signal is superimposed.
Is converted into a digital signal and an analog image signal 9 is output. The image reference clock 13 is also input to the audio PLL clock generator 15. The audio PLL clock generator 15 generates the PLL based on the image reference clock 13 to generate the audio PLL clock.
A clock 16 is generated and output to the audio D / A converter 10. The audio D / A converter 10 performs D / A conversion on the input digital audio signal 7 with reference to the audio PLL clock frequency, and outputs an analog audio signal 11.

[0005]

In the conventional optical disk reproducing apparatus 200, the audio clock used for the audio D / A conversion is generated by the PLL based on the image reference clock. By the way, the audio clock generated by the PLL has jitter. The audio data 7 is D / A converted based on the audio clock, and as a result, the analog audio signal 11 to be output is also a signal having jitter. It is desirable that the above-mentioned jitter of the audio clock be eliminated when a DVD audio disc that requires particularly high-quality audio reproduction on the user side is reproduced.

Therefore, an object of the present invention is to select a jitter-free image reference clock when reproducing high-quality images, and to select a jitter-free audio reference clock when reproducing high-quality audio. An object of the present invention is to provide an optical disk reproducing device.

[0007]

A first aspect of the present invention is an optical disk reproducing apparatus for reproducing video / audio data recorded on an optical disk, the video / audio data and data relating to the type of the disk. A data reading unit for reading and processing the data, a disk recognizing unit for recognizing the type of the optical disk based on data on the type of the disk read by the data reading unit, and a data reading unit for processing the data read by the data reading unit. A plurality of clock generating means for generating a reference clock,
A clock selecting unit that selects an appropriate clock generating unit from the plurality of clock generating units based on a recognition result of the disk recognizing unit.

As described above, according to the first aspect, an appropriate reference clock can be selected in accordance with the type of the optical disk to be set, so that reproduction can be performed according to the characteristics of the disk to be reproduced.

[0009] A second invention is an invention according to the first invention, wherein the plurality of clock generation means include an audio reference clock and a first clock generation means for generating an image clock based on the audio reference clock. And a second clock generating means for generating an audio clock based on the image reference clock and the image reference clock, wherein the clock selecting means determines that the disk including the still image data and the audio data has been set by the disk recognizing means. When it is recognized, the first clock generation means is selected, and when it is recognized that an optical disk including moving image data and audio data is set, the second clock generation means is selected.

As described above, according to the second aspect of the present invention, when performing reproduction with emphasis on sound quality, the first clock generating means is selected and the audio signal is processed based on the audio reference clock. High quality sound can be reproduced.
On the other hand, when performing reproduction with emphasis on image quality, a high-quality image can be reproduced by selecting the second clock generation means and processing the image signal based on the image reference clock. Therefore, the user can view images and sounds that make the most of the advantages of the disc to be reproduced.

[0011]

FIG. 1 is a block diagram showing the configuration of an optical disk reproducing apparatus 100 according to one embodiment of the present invention. Incidentally, the conventional optical disc reproducing apparatus 2 shown in FIG.
The same reference numerals denote the same components and signals as those in 00, and a detailed description will be omitted.

The optical disc reproducing apparatus 100 includes an optical pickup 1, a digital signal processing section 3, an image / audio decoding processing section 5, an image D / A conversion section 8, and an audio D / A conversion section 1.
0, an image clock selector 12, an image reference clock oscillator 14, an audio PLL clock generator 15, an audio clock selector 17, an audio reference clock oscillator 20,
An image PLL clock generator 21 and a controller 24 are provided. The following description is based on the assumption that the optical disk reproducing apparatus 100 reproduces a DVD video disk 30 or a DVD audio disk 31 as an example of an optical disk. The DVD video disk 30 stores moving image data, audio data, and management information. The DVD audio disk 31 stores still image data, audio data, and management information. Here, the management information is information indicating the standard, type, and the like of the optical disc stored in the lead-in area of the optical disc.

When a user sets an optical disk in the optical disk reproducing apparatus 100, the optical pickup 1 reads management information of the optical disk and outputs it to the digital signal processing unit 3 as an RF signal 2. The digital signal processing unit 3
The RF signal 2 relating to the input management information is converted into digital data and output to the control unit 24 as management information 27.
The control unit 24 has a table storing the management information of the disk played by the optical disk playback device 100 and the type of the disk specified by the management information.
When the management information 27 is input, the control unit 24 determines the type of the disk with reference to the table. The control unit 24 outputs an image clock selection signal 25 and an audio clock selection signal 26 based on the determination result. Hereinafter, the clock selection operation of the optical disc reproducing apparatus 100 when the user sets the DVD audio disc 31 and the DVD video disc 30 in the optical disc reproducing apparatus 100 will be described.
Hereinafter, when the DVD audio disk is set, the control unit 24 outputs logic “1” as the image clock selection signal 25 and the audio clock selection signal 26. When the DVD video disk 30 is set,
The logic “0” is output as the image clock selection signal 25 and the audio clock selection signal 26.

First, it is assumed that the user sets the DVD audio disk 31 in the optical disk reproducing apparatus 100.
The control unit 24 determines the type of the disk based on the input management information 27 and outputs logic “1” as the image clock selection signal 25 and the audio clock selection signal 26.
The image clock selection unit 12 outputs an image clock selection signal 25
When the logic "1" is input, the image PLL clock generator 21 is selected. The image PLL clock generation unit 21
An image PLL clock 22 is generated by a PLL operation from the audio reference clock 19 output from the audio reference clock oscillating unit 20 and output to the image clock selection unit 12. The image clock selection unit 12 outputs the image PLL clock 22 to the image / audio decoding processing unit 5 as the image clock 23.
On the other hand, when the logic “1” is input as the audio clock selection signal 26, the audio clock selection unit 17 selects the audio reference clock oscillating unit 20, and uses the input audio reference clock 19 as the audio clock 18 to set the audio D / A conversion unit 10. Output to

Next, it is assumed that the user sets the DVD video disc 30 in the optical disc reproducing apparatus 100. The control unit 24 determines the type of the disk based on the input management information 27, and outputs a logic “0” as the image clock selection signal 25 and the audio clock selection signal 26. Accordingly, the image clock selection unit 12 selects the image reference clock oscillation unit 14. The image clock selection unit 12 receives the image reference clock 1 input from the image reference clock oscillation unit 14.
3 is output to the video / audio decoding processor 5 as the video clock 23. On the other hand, the audio clock selecting unit 17
The clock generator 15 is selected. The audio PLL clock generation unit 15 performs the PLL operation based on the image reference clock 13 output from the image reference clock
The LL clock 16 is generated and output to the audio clock selection unit 17. The audio clock selecting unit 17 outputs the audio PLL
The clock 16 is output to the audio D / A converter 10 as the audio clock 18.

The operation of the control unit 24 for changing the reference clock for audio and video according to the type of the optical disk reproduced by the optical disk reproducing apparatus 100 will be described with reference to FIG.

FIG. 2 is a flowchart showing the operation of the control unit 24. The control unit 24 determines whether the management information 27 has been input (step S101). Management information 27
If no is entered, the step will not proceed. On the other hand, when the management information 27 is input, the control unit 24 reads the management information (Step S103). Next, the control unit 24 determines whether the set DVD disk is the DVD video disk 30 based on the read management information (step S105).

When the control unit 24 determines that the set DVD disk is the DVD video disk 30, the control unit 24 outputs a logic “0” as the image clock selection signal 25 to the image clock selection unit 12, and outputs the logic “0” to the audio clock selection unit 17. The logic "0" is output as the audio clock selection signal 26 (step S107). Accordingly, the image clock selection unit 12
Receives the input from the image reference clock oscillating unit 14 and outputs it as the image clock 23 to the image / audio decoding processing unit 5. On the other hand, the audio clock selecting unit 17
It receives an input from the clock generation unit 15 and outputs it as an audio clock 18 to the audio D / A conversion unit 10.

When the control unit 24 determines that the set DVD disk is not a DVD video disk, it outputs a logical “1” as the image clock selection signal 25 to the image clock selection unit 12 and outputs the audio clock to the audio clock selection unit 17. The logic "1" is output as the selection signal 26 (step S109). In response, the image clock selection unit 12 receives an input from the image PLL clock generation unit 21 and outputs it as an image clock 23 to the image / audio decoding processing unit 5. On the other hand, the audio clock selector 17 receives an input from the audio reference clock oscillator 20 and outputs the audio clock 18
Is output to the audio D / A converter 10.

As described above, the optical disc reproducing apparatus 100 according to the present embodiment can select an appropriate reference clock according to the disc to be reproduced, so that the DVD audio disc 31 for which high-quality sound reproduction is required. Is reproduced, the audio clock 18 is set to the audio reference clock 19.
Thus, an audio clock without jitter can be used. As a result, the audio D / A converter 10 can output a high-quality analog audio signal 11. Also,
When reproducing a DVD video disk 30 that requires high-quality video reproduction, an image clock without jitter can be used by using the image clock 23 as the image reference clock 13. As a result, the image D / A converter 8 can output a high-quality analog image signal 9.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc reproducing device 100 according to an embodiment of the present invention.

FIG. 2 shows a control unit 24 included in the optical disc reproducing apparatus 100.
6 is a flowchart showing the operation of the first embodiment.

FIG. 3 is a block diagram showing a configuration of a conventional optical disc reproducing device 200.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical pickup 2 RF signal 3 digital signal processing unit 4 digital data 5 image / audio decoding processing unit 6 image data 7 audio data 8 image D / A conversion unit 9 analog image signal 10 audio D / A conversion unit 11 analog voice signal 12 image clock selection unit 13 image reference clock 14 image reference clock oscillation unit 15 audio PLL clock generation unit 16 audio PLL clock 17 audio clock selection unit 18 audio clock 19 ... Audio reference clock 20 ... Audio reference clock oscillator 21 ... Image PLL clock generator 22 ... Image PLL clock 23 ... Image clock 24 ... Controller 25 ... Image clock selection signal 26 ... Audio clock selection signal 27 ... Management information 28 ... Image Output terminal 29 ... Audio output terminal 30 ... DVD video disc 31 ... VD audio disk

Claims (2)

[Claims] 1. An optical disk reproducing apparatus for reproducing video / audio data recorded on an optical disk, comprising: data read means for reading and processing video / audio data and data relating to the type of the disk; Disk recognition means for recognizing the type of the optical disk based on the data relating to the type of the disk read by the means; and a plurality of clock generation means for generating a reference clock used for processing the data read by the data reading means; An optical disc reproducing apparatus, comprising: a clock selecting unit that selects an appropriate clock generating unit from the plurality of clock generating units based on a recognition result of the disc recognizing unit. 2. The plurality of clock generation means, a first clock generation means for generating an image clock based on an audio reference clock and an audio reference clock, and an audio clock based on the image reference clock and the image reference clock The clock selecting means selects the first clock generating means when the disc recognizing means recognizes that a disc including still image data and audio data has been set, 2. The optical disk reproducing apparatus according to claim 1, wherein the second clock generating means is selected when recognizing that an optical disk including moving image data and audio data has been set.