JPH10262216A - Optical disk reproducing device and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect and display the bit rate of video data in real time by calculating the bit rate based on a value obtained by counting video data clocks for the transmission time of the video data. SOLUTION: A 0.5sec counter 21 sends out clear signals (xctclr) and latch signals (xctlat) to a BCD counter 23 and a latch circuit 24. A counter 22 performs counting by 1/313 frequency division with the unit of one clock of video data clock signals for which video transmission signals parallelly transmits the eight bits of main video compression data in a Low section. The BCD counter 23 converts an inputted integrated value from the counter 22 of the 1/313 frequency division to a decimal number and counts it and the latch circuit 24 latches the value outputted from the BCD counter 23. A rounding circuit 25 rounds off the digit of the 0.1Mbps of the value converted to a bit number and a BCD/binary conversion circuit 26 converts the inputted value to a straight binary.

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 a signal from an optical disk on which compressed data is recorded.
The present invention relates to an optical disc reproducing apparatus and method for reproducing video data and the like from a recording medium on which data compressed using the method of xperts Grupe 2) is recorded.

[0002]

2. Description of the Related Art A digital video disk (hereinafter referred to as a DVD) is a recording medium on which signal-compressed video data and the like are recorded.
Called. )It has been known. In this DVD, MPEG2 (Moving Picture Experts G
rupe 2) is used.

An optical disk reproducing apparatus for reproducing such a DVD is provided with a decoder for expanding signal-compressed video data and the like. In this optical disc playback device,
Data reproduced by a pickup or the like is expanded by this decoder, and a moving image or the like is displayed on a monitor.

[0004] In the above-mentioned MPEG2, VBR (Variable Bit Rate, VBR) for compressing by changing the bit rate of data.
(Variable speed), and the amount of data compression can be varied. For this reason, a DVD signal-compressed according to the MPEG2 system is recorded with a variable bit rate of video data and the like. That is, DVD
Video data is recorded with different compression amounts.

[0005]

By the way, some viewers may want to know the compression amount of the reproduced video. However, the conventional optical disk reproducing apparatus for reproducing a DVD cannot detect and display the bit rate of data recorded on the DVD.

Further, by knowing the bit rate of the video data and the like, it is possible to know the compression ratio of the video, for example, it is possible to know the image quality of the expanded video.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and when reproducing compressed video data or the like, the bit rate of the data is detected in real time. To provide an optical disk reproducing apparatus and a method for displaying the same.

[0008]

In order to solve the above-mentioned problems, an optical disk reproducing apparatus according to the present invention is based on a value obtained by counting a video data clock only during a transmission period of video data from a transmission unit. A bit rate calculating means for calculating a bit rate is provided.

In order to solve the above-mentioned problem, the optical disk reproducing method according to the present invention counts a video data clock during a transmission period of compressed video data read from an optical disk, and based on the counted value. The obtained bit rate is displayed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As an embodiment, an optical disk reproducing apparatus according to the present invention will be described with reference to an MPEG2 (Moving Picture).
A digital video disk (hereinafter referred to as D), which is a recording medium in which image information is signal-compressed by the Experts Grupe 2) method.
It is called VD. ) Applied to the playback device (hereinafter, referred to as
It is called a DVD playback device. ) Will be described with reference to the drawings.

FIG. 1 is a block diagram of the DVD reproducing apparatus 100. The DVD reproducing apparatus 100 includes a bit rate counter 1 that detects a compression rate of main video compression data of an RF signal reproduced from a recording medium 100 in real time.
4 is provided.

The DVD reproducing apparatus 100 includes a pickup 2 for reproducing an RF signal from a recording medium 1, an RF circuit 3 to which an RF signal reproduced by the pickup 2 is supplied and performs a binarization process and the like of the RF signal. A data decoder 4 to which reproduction data is supplied from the RF circuit 3 and performs decoding processing such as error correction, and the reproduction data decoded by the data decoder 4 are divided into main video compression data, sub-video compression data, and audio compression data. And a demultiplexer 5.

The DVD reproducing apparatus 100 includes a bit rate counter 14 for calculating a bit rate based on a value obtained by counting a video data clock for a transmission period of compressed main video data from the demultiplexer 5, a demultiplexer, 5, a video decoder 6 for expanding the compressed main video data output from the sub video decoder 5, a sub video decoder 7 for expanding the sub video compressed data and synthesizing the main video data,
Audio decoder 8 for expanding the above-mentioned audio compression data
And a digital / NTSC / PAL conversion circuit (hereinafter simply referred to as an NTSC conversion circuit) 9 which is supplied with video data obtained by combining the main video data and the sub video data from the sub video decoder 7 and converts it into an NTSC signal or a PAL signal. A digital / analog conversion circuit (hereinafter, simply referred to as an A / D conversion circuit) 10 to which audio data is supplied from the audio decoder 8 and is converted into an analog signal;
The monitor 16 displaying the video output from the TSC conversion circuit 9 and the bit rate obtained based on the value counted by the bit rate counter 14, and the display control of the bit rate displayed on the monitor 16 are performed by the NTSC conversion circuit 9. And a display control circuit 15 which is performed through the control unit.

The DVD reproducing apparatus 1 includes a pickup 2, an RF circuit 3, a data decoder 4, a demultiplexer 5, a video decoder 6, a sub-picture decoder 7, an audio decoder 8, an NTSC conversion circuit 9, an A / D conversion circuit. 10, bit rate counter 14 and display control circuit 15
And a controller 11 for controlling the
And a user interface 12 for mediating a user's operation input, and a memory 13 serving as a data storage unit of the controller 11.

In the DVD reproducing apparatus 100, the bit rate of the compressed main video data is detected as shown in FIG.
A demultiplexer 5, a bit rate counter 14,
This is realized by a circuit configuration including the display control circuit 15 and the monitor 16.

The demultiplexer 5 includes a data decoder 4
The digital data reproduced from the recording medium 1 on which the error correction decoding processing has been performed is divided into compressed main video data, compressed sub-video data, and compressed audio data.

Here, the main video compression data is MPEG2
Video data compressed in the format of, for example, Video streams in a DVD format. The sub-picture compressed data is data such as subtitles to be combined with the main picture, and is, for example, Sub-picture streams in the DVD format. The audio compressed data is audio data compressed by a method such as MPEG2, and is used for audio data in the DVD format.
o streams.

The demultiplexer 5 supplies the main video compression data to the bit rate counter 14 and the video decoder 6, and supplies the sub video compression data to the sub video decoder 7.
The audio compression data is supplied to the audio decoder 8.

For example, the main video compression data from the demultiplexer 5 is, as shown in FIG.
CAT) is a Low period, which is valid data transmitted in synchronism with the video data clock signal (CDCK) and the video decoder 6 and the bit rate counter 14.
Is output to Here, the main video compression data is output in parallel with 8 bits per clock in synchronization with the video data clock signal. The bit rate counter circuit 14 operates with a video signal processing clock, for example, a 13.5 MHz clock.

The bit rate counter 14 counts the video data clock signal input for 0.5 second and detects the bit rate of the compressed main video data output from the demultiplexer 5. .
This bit rate counter 14, as shown in FIG.
0.5 second counter 2 that outputs various signals at 0.5 second intervals
1 and a counter 22 that divides the input value by 1/313
, A BCD counter 23 that counts in decimal, a latch circuit 24 that latches the input value, a rounding circuit 25 that rounds the input value, and a BC
BCD / binary conversion circuit 2 for converting D to binary
And 6.

The 0.5 second counter 21 sends a clear signal (xctc) to a BCD counter 23 and a latch circuit 24 described later.
1r) and a latch signal (xctlat).

The counter 22 determines that the video transmission signal is L
In the ow section, the main video compression data is counted in 1/313 frequency divisions using one clock of a video data clock signal for transmitting 8-bit parallel data. The counter 22 is 1 /
The value obtained by counting at 313 frequency division is the BCD counter 2
3 is input.

The compressed main video data is of the order of Mbps, and is divided by 10,000 in order to express this to a value of 1/100 of Mbps. Further, multiply by 8 to input in 8-bit parallel. Further, since the count value for 0.5 seconds is obtained, the count value is doubled for further conversion to a value for 1 second. Then, in order to simplify the processing of data in increments of 0.5 Mbps, the count is doubled in advance. Therefore, in the counter 22,
As a result, the count number of the video data clock signal is set to 31.
It will be divided by 3 (divide by 1/313).

The BCD counter 23 receives the input 1/3
The integrated value from the counter 22 divided by 13 is converted into a decimal number and counted. The count operation time of the BCD counter 23 is 0.5 seconds, and the clear signal (xctclt) output from the 0.5 second counter 21 at 0.5 second intervals.
Has been determined by The value counted by the BCD counter 23 is input to the latch circuit 24.

The latch circuit 24 latches the value output from the BCD counter 24. This latch circuit 24
The value is output to the rounding circuit 25 every 0.5 seconds by a latch signal (xctlat) output from the 0.5 second counter 21 at 0.5 second intervals.

The rounding circuit 25 is a circuit for rounding the input value, and is 0.1 M of the value converted to the number of bits.
Rounds bps digits. The value rounded off by the rounding circuit 25 is output to the BCD / binary conversion circuit 26. The BCD / binary conversion circuit 26 converts the input value into straight binary.

The 0.5 second counter 21, counter 22, BCD counter 23 and latch circuit 24 can be reset by a reset signal (rst).

By configuring the bit rate counter 14 as described above, the bit rate of the main video compression data sent from the demultiplexer 5 to the video decoder 6 can be detected in real time based on the video data clock signal. Can be.

The bit rate counter 14 sends the bit rate value of the compressed main video data to the display control circuit 15 as shown in FIG. This bit rate counter 14
As shown in FIG. 5, the display control circuit 15 synchronizes the bit rate value (Dn) with the latch signal (xctlat).
To send to.

The display control circuit 15 recognizes the rising signal portion of the switching signal as a data boundary, and displays on the monitor 16 a bit rate value obtained by discarding the value of the rising signal portion. The monitor 16 displays the bit rate on the screen 16a with the bit rate display 17 as shown in FIG.

The bit rate display 17 allows the viewer to know the compression rate of the currently reproduced video. For example, the viewer can know the image quality by checking the compression ratio of the video.

The above bit rate is displayed when the bit rate at which the main video compressed data is transmitted is 9.8 M at the maximum.
bps, so it is performed in the range of 0 to 10 Mbps. Also, the increment of the display is set to 0.5 Mbps.

The compressed main video data input to the demultiplexer 5 is an information signal of the recording medium 1 read by the pickup 2.

The pickup 2 irradiates the signal recording surface of the recording medium 1 with laser light from a laser light source incorporated in the pickup 2 and receives the light reflected on the signal recording surface. The pickup 2 supplies an RF signal reproduced according to the received light to the RF circuit 3.

The RF circuit 3 generates digital data and a synchronization signal thereof by performing waveform equalization and binarization of the RF signal. Digital data and the like generated by the RF circuit 3 are supplied to a data decoder 4.

The data decoder 4 performs processes such as data demodulation and error correction based on the digital data generated by the RF circuit 3. Digital data demodulated by the data decoder 4 is supplied to a demultiplexer 5.

The data decoder 4 has a track buffer for outputting digital data. The difference in processing speed between the data decoder 4 and the demultiplexer 5 is absorbed by the track buffer.

The demultiplexer 5 includes a data decoder 4
The digital data reproduced from the recording medium 1 on which the error correction decoding processing has been performed is divided into compressed main video data, compressed sub-video data, and compressed audio data.

The demultiplexer 5 supplies the main video compression data to the bit rate counter 14 and the video decoder 6 described above, supplies the sub video compression data to the sub video decoder 7, and supplies the audio compression data to the audio decoder 8. Supply.

The video decoder 6 decodes the compressed main video data and generates expanded main video data by the decoding process. The video decoder 6 has an image memory for three screens for performing a decoding process. That is, using the image memory for these three screens,
I picture, P picture, B in format 2
The picture is decoded on the memory, and each decoded picture is output from the memory. This image memory is not limited to three screens, but may have more screens. The video decoder 6 supplies the generated main video data to the sub video decoder 7.

The sub-picture decoder 7 decodes the sub-picture compressed data, and combines the decoded sub-picture data with the main picture data supplied from the video decoder 6 to generate picture data. That is, the sub-picture decoder 7 combines subtitle data and the like reproduced as sub-picture data with main video data. Note that this sub-picture decoder 7
Outputs the main video data as it is when there is no sub video data. The sub-picture decoder 7
The generated video data is supplied to the NTSC conversion circuit 9.

The audio decoder 8 decodes the compressed audio data to generate expanded audio data. That is, the audio decoder 8 determines that the audio compression data is M
If the data has been compressed in the PEG2 format, decompression processing corresponding to this is performed to generate audio data. In addition,
If it is a format such as PCM in addition to the MPEG2 format, processing corresponding to the format is performed. The audio decoder 8 supplies the generated audio data to the A / D conversion circuit 10.

The NTSC conversion circuit 9 converts the video data from digital data into a television signal such as NTSC or PAL and outputs it. By supplying this output to the monitor 6, the viewer can view the video reproduced from the recording medium 1. The NTSC conversion circuit 9 is controlled by the display control circuit 15,
, And outputs the value of the bit rate to the monitor 16 together with the video data.

The monitor 16 is controlled by the NTSC conversion circuit 9, and as shown in FIG. 7, displays the reproduced video together with the display of the bit rate of the reproduced video. Therefore, the viewer can check the compression rate of the currently reproduced video by watching the bit rate display displayed simultaneously with the video.

The A / D conversion circuit 10 converts audio data, which is digital data, into analog audio data and outputs it. By supplying this output to a speaker or the like,
The user can view the video reproduced from the recording medium 1.

The controller 11 has a pickup 2, R
It controls the F circuit 3, data decoder 4, demultiplexer 5, video decoder 6, sub-picture decoder 7, audio decoder 8, NTSC conversion circuit 9, A / D conversion circuit 10, bit rate counter 14, and display control circuit 15. .

The controller 11 receives an operation input via an operation panel or a user interface 12 which is a remote controller, and controls each circuit based on the operation input.

As described above, the DVD reproducing apparatus 100 counts the video data clock signal synchronized with the main video compression data in the Low period of the video transmission signal from the demultiplexer 5 by the bit rate counter 14, and Can be calculated.

The DVD reproducing apparatus 100 can combine and display the value of the bit rate calculated in real time on the monitor 16 together with the video in which the bit rate is detected.

Therefore, the viewer can check the bit rate of the video, that is, the compression ratio of the video, together with the video reproduced by the DVD reproducing apparatus 1 and displayed on the monitor 16. For example, the viewer can know the image quality of the reproduced video from the value of the bit rate.

The bit rate can be displayed on a display unit or the like provided in the optical disk reproducing apparatus.

[0052]

The optical disk reproducing apparatus according to the present invention comprises bit rate calculating means for calculating a bit rate based on a value obtained by counting the video data clock during a period of transmitting video data from the transmitting means. so,
The bit rate of the video data can be detected in real time only by counting the video data clock synchronized with the video data transmitted from the transmission means. Then, the optical disc reproducing apparatus displays the video reproduced from the video data and the bit rate of the video, so that the viewer can simultaneously check the video and the compression ratio of the video.

Further, according to the optical disk reproducing method of the present invention, the video data clock is counted during the transmission period of the compressed video data read from the optical disk, and the bit rate obtained based on the counted value is displayed. be able to. Therefore, based on the bit rate reproduced by the optical disk reproducing method, the viewer can simultaneously check the video and the compression ratio of the video.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a DVD reproducing apparatus to which the present invention is applied.

FIG. 2 is a block diagram showing a circuit configuration of a part of the DVD reproducing apparatus configured to calculate a bit rate.

FIG. 3 is a data transmission diagram showing a state of main video compression data transmitted in a low period of a video transmission signal in synchronization with a video data clock from a demultiplexer in the DVD reproducing apparatus.

FIG. 4 is a block diagram showing a configuration of a bit rate counter provided in the DVD reproducing apparatus.

FIG. 5 is a data transmission diagram showing a state in which a bit rate value is transmitted together with a switching signal from the bit rate counter.

FIG. 6 is a diagram showing a state when the bit rate is displayed on a monitor.

FIG. 7 is a diagram showing a state where the bit rate is combined with a video and displayed on a monitor.

[Explanation of symbols]

5 demultiplexer, 14 bit rate counter,
15 monitor, 100 DVD playback device

Claims (4)

[Claims] 1. An optical disc reproducing apparatus for reproducing video data from an optical disc on which compressed video data is recorded, comprising: sending means for sending the compressed video data read from the optical disc according to a video data clock; An optical disc reproducing apparatus comprising: a bit rate calculating unit that calculates a bit rate based on a value obtained by counting the video data clock during a period of transmitting the video data from the transmitting unit. 2. The optical disc reproducing apparatus according to claim 1, wherein the bit rate of the video data is displayed by synthesizing the video data with a video obtained by the reproduced video data. 3. An optical disk reproducing method for reproducing video data from an optical disk on which compressed video data is recorded, wherein a video data clock is counted during a transmission period of the compressed video data read from the optical disk. And displaying a bit rate obtained based on the counted value. 4. The optical disc reproducing method according to claim 3, wherein the bit rate of the video data is displayed by combining the video data with a video obtained by the reproduced video data.