JP2002204416A - Optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk reproducing device that solves a problem that there exists a temporal offset between video signal and audio signal outputs in the case of outputting the video signal adopting the progressive scanning system. SOLUTION: In the case of outputting the video signal adopting the progressive scanning system from the optical disk reproducing device, a decode section outputs decoded audio stream data whose timing is delayed from that of output of video stream data and an IP(Interlace-Progressive) conversion section converts video data adopting the interlace scanning system outputted from the decode section into video data adopting the progressive scanning system. A control section controls the decode section to output the decoded audio stream data whose timing is delayed from that of output of the video stream data and controls the IP conversion section to convert the video data adopting the interlace scanning system into the video data adopting the progressive scanning system.

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 an optical disk on which video data and audio data are recorded.

[0002]

2. Description of the Related Art As an optical disk on which video data, audio data and sub-picture data are recorded, a digital versatile disk (DVD: Digital Vers.
atileDisc). An optical disk playback device that plays back a DVD extracts video data, sub-picture data, and audio data from stream data read from an optical disk, decodes each data with a respective decoder, and outputs the decoded data in synchronization.

In order to synchronize video data, sub-picture data, and audio data, each data is decoded, temporarily stored in a buffer memory, and output from the buffer memory based on a synchronization signal.

[0004]

In an optical disk reproducing apparatus for reproducing an optical disk on which a video signal such as a DVD is recorded, the video signal is currently output by an interlaced scanning method (interlaced scanning method). In the future, there is a possibility that the data will be output by the sequential operation method (progressive scanning method). In such a case, a conversion circuit for converting an interlaced scanning video signal into a progressive scanning video signal and outputting the video signal is required.

When converting an interlaced scanning video signal decoded by a decoder into a progressive scanning video signal, one to several frames of interlaced scanning video data is stored in a temporary field memory and progressively stored. A process of converting the video data into scanning video data occurs.

For this reason, the time for converting the interlaced scanning video data to the progressive scanning video data is added only to the video data, and a time difference occurs between the output of the video data and the output of the audio data. A time lag occurs between the video signal and the audio signal output from the optical disk reproducing device.

It is also conceivable that an output correction circuit for correcting a time lag between the output of the video data and the output of the audio data in the progressive scanning system is provided at a subsequent stage of the decoding unit.

However, providing an output correction circuit separately from the decoding section complicates the circuit configuration. Further, a space for providing the output correction circuit on the circuit board is required, so that the circuit board becomes large and the optical disk reproducing apparatus itself becomes large. In addition, the cost is increased by providing the output correction circuit.

An object of the present invention is to suppress the complexity of the circuit configuration, increase the size of the device and increase the cost, and to output a video signal and an audio signal without time lag even when outputting a progressive scanning video signal. It is an object of the present invention to provide an optical disc reproducing apparatus capable of performing the following.

[0010]

According to a first aspect of the present invention, there is provided a reproducing section for reading out a signal recorded on an optical disk and outputting a reproduced signal, and a demodulation processing and an error correction processing performed on the reproduced signal to provide an MPEG. A demodulation / error correction unit for outputting stream data; decoding the video stream data and audio stream data extracted from the MPEG stream data; and outputting the decoded audio stream data with respect to the video stream data output timing. A decoding unit that outputs the video data with a delay, an IP conversion unit that converts interlaced scanning video data output from the decoding unit into progressive scanning video data,
A video signal converter for converting the video data output from the converter into an analog video signal and outputting the analog video signal; a DA converter for converting the audio data output from the decoder to an analog audio signal and outputting the analog audio signal; And the IP conversion unit controls the video data to be output from the interlaced scanning system to the progressive scanning system by delaying the output timing of the audio stream data to the output timing of the video stream data. And a control unit for performing the control.

[0011]

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of an optical disk reproducing apparatus according to the present invention. The optical disc reproducing apparatus 101 includes a reproducing unit 102, a demodulation / error correction unit 103, an MPEG (Moving Picture Experts Group).
Decoding unit 104, memory unit 105, interlace progressive (IP) conversion unit 1
06, video signal converter 107, digital / analog (DA) converter 108, controller 10
9, an operation unit 110.

The reproducing unit 102 is an optical disk (DVD, etc.)
The signal recorded in the signal 111 is read, and gain control, binarization, and PLL (Phase Locked) are performed on the read signal.
Loop) control and the like, and outputs the result to the demodulation / error correction unit 103.

The demodulation / error correction unit 103 demodulates the reproduced signal (modulated signal) and performs error correction and the like. The demodulation / error correction unit 103 includes a memory (not shown), temporarily stores the demodulated and error-corrected data in the memory, reads the data from the memory based on a predetermined transfer rate, and outputs the MPEG stream data. And outputs it to the MPEG decoding unit 104.

The MPEG decoder 104 separates the MPEG stream data into video stream data, sub-picture stream data, highlight information data, and audio stream data, decodes each data, and decodes the decoded video stream data, sub-picture stream Video data obtained by combining the data and the highlight information data is output to the IP conversion unit 106, and the audio data is output to the DA conversion unit 108.

A memory unit 105 includes a buffer memory group for temporarily storing video stream data, sub-picture stream data, highlight information data, and audio stream data separated from the MPEG stream data for decoding, video data and audio data. Are respectively provided for temporarily storing.

The IP conversion unit 106 allows the user to operate the operation unit 11.
When the mode in which the video signal is output by the interlace scanning method is selected according to 0, the video data (interlace video data) of the interlace scanning method from the MPEG decoding unit 104 is output to the video signal conversion unit 107.

This interlaced video data is NTS
In the case of the C (National Television System Committee) system, the total scanning line for each frame corresponding to one screen is 525.
It is a book. One frame of interlaced video data is composed of video data of odd-numbered scanning lines (odd fields) and video data of even-numbered scanning lines (even fields).

The interlaced video data consists of the first 1 /
Only the odd field video data (262 lines) is transmitted in 60 seconds, and the remaining even field video data (263 lines) is transmitted in the next 1/60 second. Every time, odd-field video data and even-field video data are alternately scanned.

The IP conversion unit 106 allows the user to operate the operation unit 11.
When the method of outputting the video signal by the progressive scanning method is selected by 0, the interlaced video data is converted into the progressive scanning video data (progressive video data) and output.

In the progressive video data, one-frame odd field data and even field data in the interlaced video data are sequentially scanned from the first scanning line to the 525th scanning line in 1/60 second at a time. Data.

When the progressive scanning system is selected as the video signal output system, the IP conversion unit 106
The interlaced video data input from the EG decoding unit 104 is processed by a motion adaptive scanning line complementing method or the like,
Generate and output progressive video data.

Here, the processing of the motion-adaptive scanning line complementing method refers to the video data of the previous field, or the video data of the preceding and succeeding fields, or the difference between the scanning line or pixel data in the same field, or the video portion having a large motion. Is detected, a complementary scanning line is generated, and the complementary scanning line is used to complement the space between the scanning lines.

In this embodiment, a case will be described as an example where progressive video data is generated by adding video data of a previous field (for example, an odd field) and a current field (for example, an even field).

The video signal conversion unit 107 includes the IP conversion unit 1
Interlaced video data or progressive video data output from 06 is converted from digital video data to an analog video signal and output.

The DA converter 108 converts the audio data output from the MPEG decoder 104 from digital audio data to an analog audio signal and outputs it.

The control unit 109 controls the reproduction unit 102 and the demodulation / error correction unit 10 based on an instruction signal from the operation unit 110.
3. It controls the MPEG decoding unit 104, the IP conversion unit 106, the video signal conversion unit 107, and the DA conversion unit 108.

The control section 109 includes a video / audio output control section. The video / audio output control unit controls the memory control unit of the MPEG decoding unit 104 based on the output system of the video signal of the interlace scanning system or the progressive scanning system set by the user with the operation unit 110, and The timing of reading out audio data with respect to the stored video data is changed.

The control unit 109 controls the IP based on the video signal output system of the interlace scanning system or the progressive scanning system set by the user via the operation unit 110.
The conversion unit 106 controls conversion from interlaced video data to progressive video data.

That is, when the interlace scanning method is selected as the video signal output method, the IP conversion unit 1
In step 06, when the IP conversion of the video data is not performed and the progressive scanning method is selected as the output method of the video signal, the IP conversion unit 106 is controlled to perform the IP conversion of the video data.

An operation unit 110 includes an instruction button for instructing reproduction of the optical disk 111, pause / stop of reproduction, fast forward or fast rewind, an output method selection button for selecting an interlaced scanning method or a progressive scanning method, and the like. Is provided. The operation unit 110 outputs an instruction signal to the control unit based on an instruction button or an output method selection button operated by the user.

FIG. 2 is a schematic diagram showing a schematic configuration of the MPEG decoding unit, the memory unit, and the control unit in the optical disk reproducing apparatus of the present embodiment. In FIG. 2, the memory unit 10
5 includes a buffer memory group 201 and an output memory group 202. The buffer memory group 201 includes a video buffer memory 203, a sub-picture buffer memory 204, a highlight information buffer memory 205, and an audio buffer memory 206. The output memory group 202 includes a video output memory 207 and an audio output memory 208.

In the present embodiment, the buffer memory group 201 and the output memory group 202 of the memory section 105 will be described as individual memories, but the storage area in one memory may be divided and used.

In this embodiment, the buffer memory group 20
1 video buffer memory 203, sub-picture buffer memory 204, highlight information buffer memory 205
And the audio buffer memory 206 will be described as individual memories, but a storage area in one memory may be divided and used.

For example, as the buffer memory group 201,
SDRAM (Synchronous DynamicRandom Access Memor)
y) and other memory LSIs (Lar
The SDRAM may be divided into a plurality of regions by using a video buffer region, a sub-picture buffer region, a highlight information buffer region, and an audio buffer region.

The SDRAM area is divided, for example, into a video buffer area and an audio buffer area for storing video data and audio data having a large data amount.
The sub-picture data and the highlight information data are allocated to the sub-picture buffer area and the highlight information buffer area each storing 3 MB each.

In this embodiment, the output memory group 2
The video output memory 207 and the audio output memory 208 are described as individual memories, but a storage area in one memory may be divided and used.

For example, as the output memory group 202, SD
The SDRAM may be divided into a plurality of areas using a memory LSI such as a RAM having a storage capacity of 16 Mbytes, and may be used as a video area and an audio area, respectively.

The SDRAM area is divided, for example, by allocating 8 MB each to a video buffer area for storing video data and an audio buffer area for storing audio data.

In FIG. 2, the MPEG decoding unit 104
Are the stream separation unit 209 and the decode memory control unit 2
10, an audio decoding unit 211, a video decoding unit 212, a sub-picture decoding unit 213, a highlight information decoding unit 214, a memory control unit 215, an audio output unit 216, and a video output unit 217.

The stream separation unit 209 separates the MPEG stream data into video stream data, sub-picture stream data, highlight information data, and audio stream data.

The decode memory control unit 210 controls the storage of the respective stream data separated by the stream separation unit 209 in the buffer memories 203 to 206, and controls the respective stream data stored in the buffer memories 203 to 206. Performs reading control.

That is, the decode memory control unit 210
Stores video stream data in the video buffer memory 2
03, the sub-picture stream data is stored in the sub-picture buffer memory 204, the highlight information data is stored in the highlight information buffer memory 205, and the audio stream data is stored in the audio buffer memory 206.

The decode memory control unit 210 reads out video stream data from the video buffer memory 203 and outputs the video stream data to the video decode unit 212. The decode memory control unit 210 reads out the sub-picture stream data from the sub-picture buffer memory 204 and sends it to the sub-picture decode unit 213. Then, it controls to read the highlight information data from the highlight information buffer memory 205 and output it to the highlight information decoding unit 214, read the audio stream data from the audio buffer memory 206 and output it to the audio decoding unit 211.

The decode memory control unit 210 stores stream data of a data amount that enables the decoding units 211 to 214 to decode the stream data.
Each stream data is stored in each of the buffer memories 203 to 206. Then, the decode memory control unit 210 reads out each stream data from each of the buffer memories 203 to 206 for each data amount that can decode the stream data in each of the decode units 211 to 214, and
14 is output.

The audio decoder 211 decodes the audio stream data input from the decode memory controller 210 and outputs it to the memory controller 215.

The video decoder 212 decodes the video stream data input from the decode memory controller 210 and outputs it to the memory controller 215.

The sub-picture decoding section 213 decodes the sub-picture stream data input from the decoding memory control section 210 and outputs the data to the video output section 217. Here, the sub-picture data is information such as captions and titles.

The highlight information decoding section 214 decodes the highlight information data input from the decode memory control section 210 and outputs it to the video output section 217.
Here, the highlight information data sets the mixing ratio, display area, size, etc. of the colors of the video data and the data of the sub-picture (for example, a selection button) in a predetermined rectangular area in the display area of the sub-picture. Information to do.

The memory control unit 215 stores the audio stream data input from the audio decoding unit 211 in the audio output memory 208 of the output memory group 202 of the memory unit 105.
The video stream data input from the memory unit 105 is output to the video output memory 20 of the output memory group 202 of the memory unit 105.
7 is performed.

The memory control unit 215 includes the control unit 10
Based on a control signal from the video / audio output control unit 9, control is performed to change the timing of reading video stream data from the video output memory 207 and the timing of reading audio stream data from the audio output memory 208.

For example, when outputting a video signal from the MPEG decoding unit 104 in an interlaced scanning system, the memory control unit 215 reads the video stream data from the video output memory 207 and outputs the audio stream data from the audio output memory 208. Reading is performed in synchronization with the reading timing.

When the video signal is output from the MPEG decoding unit 104 by the progressive scanning method, the memory control unit 215 performs the IP conversion from the interlace scanning method to the progressive scanning method of the video signal by the subsequent IP conversion unit 106. The time required to read the audio stream data from the audio output memory 208 is delayed with respect to the timing to read the video stream data from the video output memory 207 and read.

The time required for the IP conversion is as follows. In the processing of the motion adaptive scanning line interpolation method using the previous field, the video data of the previous field (for example, an odd field) is stored, and the previous field and the current field (for example, , An even field) to generate progressive video data, which is a time (1/30 second) corresponding to one frame.

The audio output unit 216 outputs the audio stream data input from the memory control unit 215,
PCM (Pulse Code Modulation) signal and non-PCM signal ('IEC (International Electrotechnical Commi
ssion) Bit stream signal based on 61937 ')
And output as audio data.

The video output unit 217 is connected to the memory control unit 21
5, the video stream data, the sub-picture stream data input from the sub-picture decoder 213, and the highlight information data input from the highlight information decoder 214 are combined and output as video data. Video data is stored in ITU-R (Internat
ional Telecommunication Union Radiocommunication
It is a digital color difference signal conforming to the standard of StanDArdization Sector).

The operation of the optical disk reproducing apparatus of this embodiment will be described. In FIG. 1, a reproduction signal read from an optical disk 111 by a reproduction unit 102 is subjected to a gain control process, a binarization process, a PLL process, and the like, and then demodulated and processed.
The error correction unit 103 performs demodulation, error correction, and the like.

M output from demodulation / error correction section 103
The PEG stream data is sent to the MPEG decoding unit 104
Is input to

In FIG. 2, the MPEG decoding unit 104
Are separated into video stream data, sub-picture stream data, highlight information data, and audio stream data by the stream separation unit 209, and the buffer memories 203 to 206 are controlled by the decode memory control 210.
Is stored.

The data stored in the buffer memories 203 to 206 is read out for each predetermined data amount (for example, one frame to several frames) under the control of the decode memory control section 210, , The video decoding unit 212, the sub-picture decoding unit 213, and the highlight information decoding unit 214.

The audio stream data is decoded by the audio decoding unit 211 and the memory control unit 2
15, the video stream data is decoded by the video decoding unit 212,
5 is input.

The sub-picture stream data and the highlight information data are respectively transmitted to the sub-picture decoder 2.
13 is decoded by the highlight information decoding unit 214 and input to the video output unit 217.

The memory control unit 215 stores the audio stream data input from the audio decoding unit 211 in the audio output memory 208 of the output memory group 202 of the memory unit 105.
The video stream data input from the memory 12 is output to the video output memory 207 of the output memory group 202 of the memory unit 105
Is performed.

The control unit 109 confirms whether to output the video signal by the interlace scanning method or the progressive scanning method by the instruction signal from the operation unit 110.

When outputting a video signal by the interlaced scanning method, the video / audio time control section of the control section 109 reads the video stream data stored in the video output memory 207 and stores the video stream data in the audio output memory 208. The memory control unit 215 of the MPEG decoding unit 104 reads the audio stream data in synchronization with the read timing.
To output a control signal.

The memory control unit 215 determines the timing of reading video stream data from the video output memory 207 and the timing of reading audio stream data from the audio output memory based on a control signal from the video / audio time control unit of the control unit 109. The data is read out in synchronization, the audio stream data is output to the audio output unit 216, and the video stream data is output to the video output unit 217.

On the other hand, when outputting a video signal by the progressive scanning method, the video / audio time control unit of the control unit 109 controls the audio output memory 208 with respect to the timing of reading the video stream data stored in the video output memory 207. A control signal is output to the memory control unit 215 of the MPEG decoding unit 104 so that the audio stream data stored in the MPEG decoding unit 104 is read with a delay of the time required for the IP conversion.

The memory control unit 215 transmits the audio stream data from the audio output memory 208 to the timing of reading the video stream data from the video output memory 207 based on the control signal from the video / audio time control unit of the control unit 109. The read timing is read with a time delay required for the IP conversion, the audio stream data is output to the audio output unit 216, and the video stream data is output to the video output unit 217.
Output to

The audio stream data output from the memory control unit 215 is converted into PCM signal and non-PCM signal audio data by the audio output unit 216 and input to the DA conversion unit 108 shown in FIG.

The video output unit 217 outputs the video stream data output from the memory control unit 215, the sub-picture stream data input from the sub-picture decode unit 213, and the highlight information data output from the highlight information decode unit 214. The images are synthesized and input to the IP conversion unit 106 shown in FIG. 1 as video data.

In FIG. 1, when the output system of the video signal is the interlace scanning system, the MPEG decoding unit 104
Is passed through the IP conversion unit 106 as it is, and is input to the video signal conversion unit 107.

At this time, the audio data is MPEG
It is output at a timing synchronized with the output timing of the interlaced video data from the decoding unit 104.

The interlaced video data output from the IP conversion unit 106 is converted from digital video data to an analog video signal by the video signal conversion unit 107 and output as a video signal.

The audio data output from the MPEG decoder 104 is converted from digital audio data to an analog audio signal by the DA converter 108 and output as an audio signal.

Therefore, when the interlace scanning method is selected as the video signal output method, the audio signal is output from the optical disk reproducing apparatus in synchronization with the video signal.

On the other hand, when the output system of the video signal is the progressive scanning system, the video data output from the MPEG decoding unit 104 is output by the IP conversion unit 106 during the time required for the IP conversion of the interlaced video data.
The video data is converted from interlaced video data to progressive video data and input to the video signal conversion unit 107.

At this time, the audio data is MPEG
The decoder 104 outputs the progressive video data at a timing delayed from the output timing of the progressive video data by a time required for the IP conversion.

The progressive video data output from the IP conversion unit 106 is converted from digital video data to an analog video signal by the video signal conversion unit 107 and output as a video signal.

The audio data is output from the MPEG decoder 104 with a delay of one frame with respect to the progressive scan video data, and is output from the DA converter 1.
At 08, the digital audio data is converted into an analog audio signal and output as an audio signal.

Therefore, even when the progressive scanning system is selected as the video signal output system, there is no time lag between the output of the video signal and the output of the audio signal, and the video signal is output from the optical disk reproducing apparatus.

As described above, when the progressive scanning system is selected as the video signal output system, the MPEG decoding unit performs the IP conversion from the interlaced video data to the progressive video data in the IP conversion unit. The audio data is output with a delay with respect to the video data by the required time.

As a result, even when the progressive scanning method is selected as the video signal output method, the output of the audio signal and the output of the video signal are output without a time lag. Therefore, even when either the interlaced scanning method or the progressive scanning method is selected as the video signal output method, the output of the audio signal and the output of the video signal are output without time lag.

In the optical disk reproducing apparatus according to the present embodiment, the control section controls the MPEG decoding section and the memory section, so that the time lag between the output of the progressive scan video data and the output of the audio data is reduced by the MPEG.
The correction is performed at the time of reading data from the memory unit used for the processing of the decoding unit.

For this reason, it is not necessary to separately provide an output correction circuit for correcting the time lag between the output of the video data and the output of the audio data in the progressive scanning system, for example, at the subsequent stage of the decoding unit. The decoding unit and the memory unit used in the disc playback device can be used. Therefore, the provision of the output correction circuit does not increase the size of the circuit board and does not complicate the circuit configuration.

[0084]

According to the present invention, the complexity of the circuit configuration, the increase in the size of the apparatus and the increase in cost are suppressed, and even when a progressive scanning video signal is output, there is no time lag and the video signal and the audio signal are output. Can be output.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of an optical disk reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing an MPE in the optical disc reproducing apparatus according to the embodiment.
FIG. 2 is a schematic diagram showing a schematic configuration of a G decoding unit, a memory unit, and a control unit.

[Explanation of symbols]

101: Optical disk reproducing device, 102: Reproducing unit, 103: Demodulation / error correction unit, 104: MP
EG decoding unit, 105 ... memory unit, 106 ...
IP converter 107, video signal converter 108
.. A DA conversion unit, 109 ... a control unit, 110 ... an operation unit, 111 ... an optical disk. 201: buffer memory group, 202: output memory group, 203: video buffer memory, 204 ...
· Sub-picture buffer memory, 205 · · · highlight information buffer memory, 206 · · · audio buffer memory, 207 · · · video output memory, 208 · · ·
Audio output memory, 209: stream separation unit, 210: decode memory control unit, 211:
Audio decoding unit, 212: video decoding unit, 213: sub-picture decoding unit, 214 ...
-Highlight information decoding unit, 215 ... memory control unit, 216 ... audio output unit, 217 ... video output unit.

Continued on front page F-term (reference)

Claims (1)

[Claims] A reproducing unit for reading out a signal recorded on an optical disk and outputting a reproduced signal; a demodulating / error correcting unit for performing demodulation processing and error correction processing on the reproduced signal and outputting MPEG stream data; A decoding unit that decodes video stream data and audio stream data extracted from the stream data, delays the output timing of the decoded audio stream data with respect to the output timing of the video stream data, and outputs the decoded data. An IP conversion unit for converting the interlaced scanning video data into progressive scanning video data,
A video signal converter for converting the video data output from the IP converter to an analog video signal and outputting the same, a DA converter for converting the audio data output from the decoder to an analog audio signal and outputting the same, Controlling the output of the audio stream data to the decoding unit to be delayed with respect to the output timing of the video stream data, and causing the IP conversion unit to convert the video data from the interlaced scanning system to the progressive scanning system. An optical disc reproducing apparatus comprising: a control unit for performing control.