JPH10341412A - Signal reproducing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk reproducing device for detecting the bit rate of compressed video data in real time at the time of reproducing the compressed video data or the like. SOLUTION: For this device, a DVD reproducing device 100 is provided with a video bit rate calculation circuit 15 for obtaining the bit rate of main video compressed data based on the data amount information of main information inside a navigation pack for recording auxiliary information relating to the main video compressed data, a display control circuit 16 for display controlling the bit rate of the main video compressed data obtained in the video bit rate calculation circuit 15, an OSD circuit 14 for compositing the display of the displaycontrolled bit rate outputted from the display control circuit 16 to video images outputted from an NTSC conversion circuit 9 and a monitor 17 for projecting the video images composited or the like in the OSD circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to compressed video data, for example, MPEG2 (Moving Picture Experts Groove).
More specifically, the present invention relates to a signal reproducing apparatus and method for reproducing a signal recording medium on which video data compressed using the method 2) is recorded. About.

[0002]

2. Description of the Related Art Data compression is performed to transmit or record a large amount of information. For example, signal recording media include
Some data is recorded by compressing the data. For example,
Digital video disk (hereinafter referred to as DVD)
Is known as a signal recording medium on which video data and the like are compressed and recorded. DVD adopts MPEG2 (Moving Picture Experts Group 2) as a signal compression method.

[0003] A disk reproducing apparatus, which is a signal reproducing apparatus for reproducing the DVD, is provided with a decoder for expanding video data or the like which has been compressed. The disk reproducing device decompresses data reproduced by a pickup or the like by the decoder and displays a moving image or the like on a monitor.

[0004] For example, in the above-mentioned MPEG2, VBR (Variable B) is used to compress the data by changing the bit rate of the data.
It Rate (variable rate) is supported, and the data compression amount can be made variable. Therefore, a DVD adopting the MPEG2 system is recorded with a variable bit rate of video data and the like. That is, DVD
The amount of compression of video data and the like is recorded differently.

[0005] In the DVD, compressed audio data and sub-video data are recorded as main information in addition to the compressed video data. On the DVD, auxiliary data relating to the video data, audio data, and sub-video data, for example, the type of audio data and the like are recorded as auxiliary information.

[0006]

By the way, if the data bit rate is high, the quality of the screen is high and a beautiful image is obtained. However, depending on the compression process, the screen may not be high quality even at a high bit rate. That is, the bit rate can be an objective judgment factor of the quality of the image.

However, in the conventional disk reproducing apparatus, the DV
The bit rate of the data recorded in D could not be detected. That is, the viewer cannot know how much the video data has been compressed, and thus cannot objectively judge the image.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and when reproducing compressed video data or the like, a signal reproducing apparatus and method for detecting the bit rate of the compressed video data in real time. The purpose is to provide.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a signal reproducing apparatus according to the present invention provides a video bit for obtaining a bit rate of video compressed data based on data amount information of main information in auxiliary information. It has a rate detecting means.

In order to solve the above-mentioned problem, the signal reproducing method according to the present invention obtains the bit rate of the compressed video data based on the data amount information of the main information in the auxiliary information.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a signal reproducing apparatus according to the present invention will be described as a digital video disc (hereinafter, referred to as a recording medium) on which main video compression data signal-compressed by the MPEG2 (Moving Picture Experts Group 2) system is recorded. ,
It is called DVD. ) For playback devices (hereinafter, referred to as
It is called a DVD playback device. ) Will be described with reference to the drawings.

[0012] The DVD reproducing apparatus is a DVD player in which main information including main video compression data and auxiliary information of the main information are recorded.
This is a playback device that plays back VD. The main information is composed of the main video compression data, the sub video compression data, and the audio compression data.

As shown in FIG. 1, the DVD reproducing apparatus performs a main operation on the basis of data amount information of main information in a control information pack (hereinafter, referred to as a navigation pack) in which auxiliary information on main video compression data is recorded. A video bit rate calculation circuit 15 for determining the bit rate of the video compression data is provided. The DVD playback device 100 includes a display control circuit 14 that controls the display of the bit rate calculated by the video bit rate calculation circuit 15.

The DVD reproducing apparatus 100 includes a recording medium 1
And a pickup 2 for reproducing an RF signal from the receiver 2 and an RF signal reproduced by the pickup 2
An RF circuit 3 for performing a binarization process of a signal, a data decoder 4 to which reproduction data is supplied from the RF circuit 3 and performing a decoding process such as an error correction, and a reproduction data decoded by the data decoder 4. A demultiplexer 5 for distributing compressed video data, compressed sub-video data, compressed audio data, and auxiliary information is provided.

The DVD reproducing apparatus 100 includes a video decoder 6 for expanding the main video compressed data output from the demultiplexer 5 and a sub-video decoder 7 for expanding the sub-video compressed data and combining it with the main video data. And an audio decoder 8 for expanding the compressed audio data, and video data obtained by synthesizing the sub-video data and the main video data from the sub-video decoder 7 and supplied with an NTSC signal or PAL
A digital / NTSC / PAL conversion circuit (hereinafter simply referred to as an NTSC conversion circuit) 9 for converting a signal into a signal, and a digital / analog conversion circuit (hereinafter simply referred to as D / A / A, a display control circuit 16 for controlling display of the bit rate of the main video compression data obtained by the video bit rate calculation circuit 15, and an NTS.
OSD (On Screen Display) circuit 1 for synthesizing the display of the bit rate controlled by the display output from the display control circuit 16 with the video output from the C conversion circuit 9
4 and a monitor 17 for displaying an image synthesized by the OSD circuit 14 and the like.

Further, the DVD reproducing apparatus 100 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, and a D / A conversion circuit 10. , An OSD circuit 14 and a display control circuit 16, and a user interface 12 for mediating the controller 11 and a user's operation input
And a memory 13 serving as a data storage unit of the controller 11
And

The controller 11 includes the above-described video bit rate calculation circuit 15 for calculating the bit rate of the compressed main video data reproduced from the recording medium 1. The controller 11 includes a video bit rate calculation circuit 1
The bit rate of the compressed main video data calculated in step 5 is output to the display control circuit 16.

Note that the recording medium 1 has the DV format as described above.
D, as shown in FIG. 7, is a unit of one movie or the like, and is recorded by a Video Object Set (hereinafter referred to as VOBS).

Each VOBS has a Co for reproducing it.
Video Title Set Information (ntrol Data)
It is called VTSI. ). It is read before VOBS playback.

VOBS is composed of a plurality of Video Objects (hereinafter referred to as "Video Objects").
It is called VOB. ). DVDs are formatted, for example, in accordance with a multi-story function that allows one movie to be viewed in a plurality of story developments, and such a function is applied to a different story development for each VOB. Become. The VOB is composed of a plurality of cells.

The Cell is a unit such as one scene in a movie, for example. In other words, the combination for each scene becomes a VOB, and the difference in the combination constitutes the multi-story function. And Cell
Multiple Video Object Units (hereinafter referred to as VOBU)
It consists of.

The VOBU is composed of a plurality of groups of compressed main video data, compressed sub video data, and compressed audio data.

The compressed main video data is data that becomes a main video of a movie and constitutes a video stream in the DVD format. The sub-picture compressed data is data such as subtitles and forms a sub-picture stream in the DVD format. The audio compression data is data relating to audio and constitutes an audio stream in the DVD format.

It should be noted that the main video compression data in the VOBU is used to set the Group of Pic
tures (hereinafter referred to as GOP). GOP
Is a unit of the structure of the inter-frame prediction in the MPEG2 system, and is composed of three pictures of an I picture, a P picture, and a B picture.
Each frame is composed of 15 types of frames, for example.

In the VOBU, compressed main video data is stored in a main video pack (V_PCK), compressed sub video data is stored in a sub video pack (SP_PCK), and compressed audio data is stored in an audio pack (A_PCK). . Each pack has information on each data to be stored.

The VOBU includes a navigation pack (NV_PC) which includes auxiliary information of the main video compression data, the sub video compression data and the audio compression data in a header portion thereof.
K).

The above navigation pack is shown in FIG.
As shown in the figure, the P containing the playback control information in the VOBU is
CI (Presentation Control Information) section and V
DSI (Data S) including data search information in OBU
earch Information) section.

Each component of the DVD reproducing apparatus 100 for reproducing the recording medium 1 configured as described above will be described in detail.

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 synchronizing 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 process and the like have been performed are divided into various packs, that is, a main video pack, a sub video pack, and an audio pack.

The demultiplexer 5 supplies the main video pack to the video decoder 6, supplies the sub video pack to the sub video decoder 7, and supplies the audio pack to the audio decoder 8.

The video decoder 6 decodes the compressed main video data in the supplied main video pack, and generates expanded main video data by this decoding process. The video decoder 6 has an image memory for three screens for performing a decoding process. That is, using the image memories for three screens, the I picture, the P picture, and the B picture in the MPEG2 format are decoded on the memory, and the decoded pictures are output from the memory. . The video decoder 6 supplies the generated main video data to the sub video decoder 7.

The sub-picture decoder 7 decodes the compressed sub-picture data in the supplied sub-picture pack, and combines the decoded sub-picture data with the main picture data supplied from the video decoder 6. And generate video data.
That is, the sub-picture decoder 7 combines subtitle data and the like reproduced as sub-picture data with main video data. When there is no sub-video data, the sub-video decoder 7 outputs the main video data as it is as video data. The sub-video decoder 7 converts the generated video data into an NTS
It is supplied to the C conversion circuit 9.

The NTSC conversion circuit 9 converts video data from digital data into a television signal such as NTSC or PAL. The television signal from the NTSC conversion circuit 9 is displayed as an image on the monitor 17 via the OSD circuit 14.

The audio decoder 8 decodes the compressed audio data in the audio pack and generates expanded audio data. That is, if the audio data is compressed by the MPEG2 system, the audio decoder 8 performs decompression processing corresponding to the compression to generate audio compressed data. The audio decoder 8 performs processing corresponding to the linear PCM or Dolby AC3 format in addition to the MPEG2 format. The audio decoder 8 supplies the generated audio data to the D / A conversion circuit 10.

The D / A conversion circuit 10 converts digital audio 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 includes a pickup 2, R
F circuit 3, data decoder 4, demultiplexer 5, video decoder 6, sub-picture decoder 7, audio decoder 8, NTSC conversion circuit 9, D / A conversion circuit 10, OS
The control of the D circuit 14 and the display control circuit 16 is performed.

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.

The controller 11 uses the video bit rate calculating circuit 15 to calculate the main video data based on the main information in the navigation pack, that is, the data amount information of the main video compression data, sub-video compression data and audio compression data in the VOBU. Find the bit rate of the compressed data.

The calculation of the bit rate by the video bit rate calculation circuit 15 is performed according to the flowchart shown in FIG. First, as shown in step S1, the video bit rate calculation circuit 15 outputs the total bit rate (T_
BR), that is, the total bit rate of the main video compression data, the sub video compression data, and the audio compression data in the VOBU,
Ask for.

Next, the video bit rate calculation circuit 15
As shown in step S2, the audio bit rate (A_BR), that is, the bit rate of the audio compression data is obtained.

Then, the video bit rate calculation circuit 15
Calculates the video bit rate, that is, the bit rate of the compressed main video data, as shown in step S3. Here, the video bit rate (V_BR) is calculated by subtracting the audio bit rate calculated in step S2 from the total bit rate (T_BR) calculated in step S1.

In this embodiment, the bit rate (SP_BR) of the compressed sub-picture data is sufficiently smaller than the video bit rate (V_BR) and the audio bit rate (A_BR). Because it is.

That is, originally, the video bit rate (V_BR) is obtained as in equation (1).

V_BR = T_BR−SP_BR−A_BR (1) However, since SP_BR ≒ 0, the video bit rate (V_BR) as an approximate value is calculated as in equation (2).

V_BR ≒ T_BR-A_BR (2) Hereinafter, the calculation of the total bit rate and the calculation of the audio bit rate performed in step S1 and step S2 will be described.

The video bit rate calculation circuit 15 calculates the total bit rate according to the flowchart shown in FIG.

First, the video bit rate calculation circuit 15 calculates the total number of bits in the VOBU as shown in step S11. As shown in FIG. 8B and FIG. 8C, the total number of bits is DSI_GI (Da) in which information on the DSI of the navigation pack is recorded.
ta Search Information General Information), and is obtained based on VOBU_EA indicating the end address of the VOBU recorded in DSI_GI.

The VOBU_EA indicates the number of sectors of the VOBU. One sector is 2048 bytes (2048 × 8 bits). Therefore, the video total bit rate calculation circuit 15 calculates the total bit number (M) according to the equation (3).

M (bits) = 2048 × 8 × VOBU_EA (3) Then, the video bit rate calculation circuit 15 performs the processing in step S
As shown in FIG. 12, the playback time (PTM) of the VOBU is calculated. As shown in FIGS. 9A to 9C, the reproduction time is a PCI_GI (Presentation Control I) in which information on the PCI of the navigation pack is recorded.
nformation General Information) and PCI_
It is obtained based on VOBU_S_PTM indicating the playback start time of the VOBU recorded in the GI and VOBU_E_PTM indicating the playback end time of the VOBU.

That is, the video bit rate calculation circuit 15
Can calculate the VOBU playback time (PTM) from equation (4).

PTM (second) = (VOBU_E_PTM−VOBU_S_PTM) / 90000 (4) The numerical value 90000 in the expression (4) is the reproduction time (PT
M) is a coefficient for making seconds.

Then, the video bit rate calculating circuit 15
Calculates the total bit rate (T_BR) as shown in step S13. That is, the video bit rate calculation circuit 15 calculates the total bit rate (T_BR) by dividing the total number of bits (M) by the reproduction time (PTM), as in equation (5).

T_BR (bps) = M / PTM (5) The above is the process of calculating the total bit rate (T_BR) in step S1 of FIG.

Next, the process of calculating the audio bit rate in step S2 of FIG. 2 will be described. The video bit rate calculation circuit 15 calculates the audio bit rate (A_BR) according to the flowchart shown in FIG.
Ask for.

First, the video bit rate calculation circuit 15
As shown in step S21, the number of audio streams in the VOBU is obtained. The number of audio streams is obtained by referring to VTS_AST_Ns indicating information on the number of audio streams recorded in VTSI. For example, the video bit rate calculation circuit 15
_AST_Ns, linear PCM and Dolby A
Suppose that the information that C3 and one are included is obtained.

Next, as shown in step S22, the types of the audio stream obtained in the previous step S21, that is, the types of linear PCM and Dolby AC3 are obtained. The type of audio stream is VTSI
The information is obtained by referring to VTS_AST_ATRT indicating the information of the type of the audio stream recorded in.

By the way, the linear PCM has three types of quantization bit numbers of 16 bits, 20 bits and 24 bits.
The sampling frequency is configured by one of two combinations of 48 kHz and 96 kHz. For example, it is assumed that the video bit rate calculation circuit 15 obtains information that the quantization bit of the linear PCM is 16 bits and the sampling frequency is 48 kHz from the VTS_AST_ATRT.

There are also several types of bit rates for the Dolby AC3, which can be obtained by supplying reproduction information extracted from the stream passing through the demultiplexer 5 to the video bit rate calculation circuit 15.

Then, the previous step S21 and step S21
On the basis of the result obtained in step S22, in step S23, the video bit rate calculation circuit 15 obtains the audio bit rate. That is, the linear PCM bit rate 1536 kbps (= 16 × 4) calculated from the quantization bit number 16 bits and the sampling frequency 48 kHz.
The audio bit rate is obtained by adding the bit rate of Dolby AC3, for example, 384 kbps, to (8000 × 2). That is, the audio bit rate (A_B
R) is calculated from equation (6).

A_BR (kbps) = 1536 + 384 (6) = 1920 The total bit rate (T_B) obtained as described above
R) and the audio bit rate (A_BR) to calculate the video bit rate (V_BR). That is, the video bit rate (V_BR) is calculated by substituting the values of the total bit rate (T_BR) and the audio bit rate (A_BR) into the above equation (2).

For example, when the total bit rate (T_BR) calculated from the above equation (5) is 8 Mbps,
Substituting values into the above equation (2), The calculation result of the video bit rate (V_BR) can be obtained.

As described above, the controller 11
The video bit rate calculating circuit 15 can calculate the bit rate of the main video compressed data.

The controller 11 outputs the video bit rate calculated by the video bit rate calculation circuit 15 to the display control circuit 16.

The display control circuit 16 controls the display of the input video bit rate. The display control circuit 16 performs display control for converting the video bit rate into an image signal in order to display the image of the level meter on the monitor 17 as shown in FIG. 5, for example. The display control circuit 16 supplies the image of the video bit rate whose display is controlled to the OSD circuit 14.

The OSD circuit 14 combines the television signal supplied from the NTSC conversion circuit 9 with the image signal of the video bit rate supplied from the display control circuit 16, and displays the composited video signal on the monitor 17. Supply. The monitor 17 displays the bit rate superimposed on the video based on the video signal supplied from the OSD circuit 14 as a level meter, for example, as shown in FIG.

As described above, the DVD reproducing apparatus 100 can display the bit rate of the compressed video data calculated by the video bit rate calculation circuit 15 of the controller 11 on the monitor 17.

Then, the DVD reproducing apparatus 100 can display the bit rate of the compressed video data of the decoded video by subjecting the decoded video to zoom imposition. Therefore, the viewer
With the VD playback device 100, the video bit rate at that moment can be grasped in real time and objectively.

It should be noted that the DVD reproducing apparatus 100 is not limited to the above-described number and type of audio compressed data streams, but calculates the video bit rate even if the number and type of the streams are other numbers and types. be able to. Furthermore, when the main information includes other data in addition to the above-described video sub-data and audio data, the DVD reproducing apparatus 100 can calculate the video bit rate in consideration of the data.

The DVD reproducing apparatus 100 has a display unit for displaying the bit rate of the compressed main video data,
It can also be provided in the playback device 100. Thus, the viewer can confirm the bit rate of the main video compression data also on the display unit provided in the DVD reproducing device 100.

[0074]

The signal reproducing apparatus according to the present invention comprises a video bit rate detecting means for obtaining a bit rate of video compressed data based on the data amount information of the main information in the auxiliary information. The bit rate of data can be detected in real time. By superimposing the bit rate on the video, it is possible to objectively determine the quality of the video.

According to the signal reproducing method of the present invention, the bit rate of the compressed video data is obtained based on the data amount information of the main information in the auxiliary information. Rates can be detected in real time. By superimposing the bit rate on the video, it is possible to objectively determine the quality of the video.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a DVD reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure in which the DVD reproducing apparatus obtains a video bit rate.

FIG. 3 is a flowchart showing a procedure for calculating a bit rate of a main video in a process in which the DVD reproducing apparatus obtains a video bit rate.

FIG. 4 is a flowchart showing a procedure for calculating the bit rate of audio compression data in the process of obtaining the video bit rate by the DVD reproducing apparatus.

FIG. 5 is a diagram illustrating a state in which the DVD playback device displays a bit rate on a monitor.

FIG. 6 is a diagram showing a state in which the DVD reproducing apparatus superimposes an image on a monitor to display a bit rate on a monitor.

FIG. 7 shows a DVD reproduced by the DVD reproducing apparatus.
Data format.

FIG. 8 shows a data format of PCI_GI information recorded in the navigation pack of the DVD.

FIG. 9 shows a data format of DSI_GI information recorded in the navigation pack of the DVD.

[Explanation of symbols]

15 Video bit rate calculation circuit, 100 DVD playback device

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kimika Mizuno 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (6)

[Claims] 1. A signal reproducing apparatus for reproducing a signal recording medium on which main information including video compression data and auxiliary information including auxiliary data of the main information are recorded, comprising: a data amount of the main information in the auxiliary information; A signal reproducing apparatus comprising: a video bit rate detecting means for obtaining a bit rate of the video compressed data based on information. 2. The signal reproducing apparatus according to claim 1, further comprising display control means for controlling display of the video bit rate. 3. The auxiliary information and the main information including audio data are grouped for each reproduction unit, and the video bit rate detecting means is configured to determine a bit rate of the main information obtained based on the auxiliary information. 2. The signal according to claim 1, wherein the video bit rate of the compressed video data in the group for each reproduction unit is calculated by subtracting the bit rate of the audio data obtained based on the auxiliary information from the video signal. Playback device. 4. A signal reproducing method for reproducing a signal recording medium on which main information including video compressed data and auxiliary information including auxiliary data of the main information are recorded, wherein a data amount of the main information in the auxiliary information A signal reproducing method, wherein a bit rate of the video compression data is obtained based on information. 5. The signal reproducing method according to claim 4, further comprising display control means for controlling display of said video bit rate. 6. The auxiliary information and the main information including audio data are grouped for each reproduction unit, and are obtained based on the auxiliary information from a bit rate of the main information obtained based on the auxiliary information. 5. The signal reproduction method according to claim 4, wherein the video bit rate of the video compression data in the group for each reproduction unit is calculated by subtracting the bit rate of the audio data.