JP2003299020A - Apparatus and method for encoding moving image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce accessing to the SDRAM to generate a navigation pack of a DVD-Video standard. <P>SOLUTION: A method for encoding a moving image comprises the steps of: storing a video elementary stream of the time range of searching information described in navigation information in a buffer memory; generating the navigation information based on the data quantity information of each picture; and then multiplexing the video, audio and navigation information. The method further comprises the steps of: storing an original image of the time range of the searching information described in the navigation information in the buffer memory; two-pass encoding the image simply; generating the navigation information based on target data quantity information at each GOP; multiplexing the video, audio and navigation information; reading the program stream from the SDRAM; and then multiplexing the navigation pack. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture coding apparatus and method for compressing and coding moving picture signals and audio signals and recording the same, and more particularly to generating and multiplexing navigation information of moving picture information. The present invention relates to a moving picture coding apparatus and method for recording.

[0002]

2. Description of the Related Art In recent years, a DVD (Digital) for compression-coding video and audio and digitally recording them on an optical disk.
Versatile Disc) recorders are becoming popular. Recording media used in a DVD recorder include a DVD-R that can be recorded only once, a rewritable DVD-RW, and a DVD-RAM. DVD
The standards of the DVD Specification for Re are established for DVD players for playback only.
ad-Only Disc (hereinafter referred to as DVD-Video
(Referred to as the standard) and DV established for DVD recorders.
D Specifications for DVD-
RAM / DVD-RW / DVD-R for Gene
ral Discs (hereinafter, DVD-Video Re
There are two types of code standards). This 2
DVD-Video Rec
A disc recorded in the ordering standard is a DVD-V
It cannot be played back by a DVD player dedicated to playback that supports only the video standard. For DVD recorders, DV
Recording is performed by using the D-Video Recording standard, which is a normal use method.
Also important is a method of recording on a VD-R disc using the DVD-Video standard.

According to the DVD-Video standard, ISO / IEC13818-1 (commonly called MPEG2 (Moving Picture Exp) is used as a multiplexing system for video and audio.
The program stream method of the erts Group 2) system) is adopted. In MPEG2, as shown in FIG. 7, a video elementary stream generated by encoding a video and an audio elementary stream generated by encoding audio are respectively 204
One program stream is formed by dividing the pack into 8 bytes and multiplexing the video pack and the audio pack. Not only video packs and audio packs but also navigation packs containing navigation information are multiplexed on the same program stream. The navigation pack includes search information DSI (Dat) for special playback such as fast-forward playback and rewind playback.
a Search Information) is included. 240 VOBU (Vid
within the range of eo Object Unit), that is, 48
The relative start address information for 0VOBU is described. However, VOB (Video O) which is an aggregate of VOBUs
It is specified that only the relative start address of VOBU within the range of
If there are more than VOBU, the relative start address information of 240 VOBUs before and after is stored, but 1 VOB is 481 VO.
If the number is smaller than BU, the address within the same VOB range may be described. For example, 1VOB = 121VOB
If it is U, the address information of 120 VOBU may be written together before and after. The VOBU is an aggregate of packs from the navigation pack to the pack immediately before the next navigation pack. 0.4 for VOBU
It must contain a video or audio signal with a playback time from seconds to 1 second. When a VOBU contains a video pack, the video data contains one or more GOPs (Gr
of Of Pictures) must be included. GOP is ISO / IEC13818-2 (commonly known as M
This is a concept defined by PEG2 video) and is an aggregate of frames that form a video. Normally, one GOP is composed of 15 frames having a reproduction time of 0.5005 seconds, and one VOBU contains one GOP.

In the DVD recorder, the variable bit rate (VBR) coding is also considered important. DV
Since the D disc has a limited capacity, the bit rate (data amount per unit time) must be controlled in order to record an image for a predetermined time. With variable bit rate, the bit rate is not fixed and the scenes with strong motion and low correlation between frames or the scenes with complicated pictures and high frequency components are coded at a high bit rate and the motion is small and the correlation between frames is high. This is a coding method for improving the image quality of the entire video by coding at a low bit rate for a scene or a scene with a flat pattern and few high-frequency components.

When a video is encoded in real time by variable bit rate control and recorded in real time using the DVD-Video standard, it becomes difficult to add a navigation pack. As described above, the DSI data of the navigation pack must describe the relative start address of the VOBU encoded later in time than the navigation pack. However, when video is coded at a variable bit rate, the amount of GOP data is not constant. That is, the amount of GOP data is unknown until the video is actually encoded. 1
Since one VOBU contains the data of one GOP,
The amount of VOBU data is unknown until the video is actually encoded. Therefore, the relative start address of the VOBU encoded later in time than the navigation pack becomes unknown, and the navigation pack cannot be added in real time.

In order to solve such a problem, the technical report VOL. 25, NO. 61, p.
25-30, CE 2001-24 (September 21, 2001)
(Japanese) (hereinafter referred to as Conventional Technique 1), the following technique is reported.

"In order to record in accordance with the DVD video standard by the VBR system, the recording data is not directly written to the disk but is temporarily stored in the recording buffer and the search information (= navigation information) is stored at the time when the search information is determined. We have developed a method of embedding it in a stream and recording it on a DVD-R disc .... At the time of recording, the data of the program stream is accumulated in the recording buffer, but a data area for storing search information in advance is stored in the navigation area. The search information is inserted into the navigation area when the amount of data necessary for determining the future search information is accumulated, and when the insertion is completed, the data is written to the DVD-R disc. With processing like
DVD-R recording control using BR is realized. "

[0008]

In the above-mentioned prior art 1, in order to generate the MPEG2 program stream, an SDRAM (Synchro) is used as a buffer memory.
nouse Dynamic Random Acces
s Memory). Generally, DVD
Many digital signal processing circuits in a recorder require the use of SDRAM, such as video coding blocks, audio coding blocks, video elementary stream buffer units, audio elementary stream buffer units, and program stream recording buffer units. is there. In the related art 1, as the SDRAM accessed by the video coding block, the audio coding block, the video elementary stream buffer unit, and the audio elementary stream buffer unit, the encoder SDR is used.
AM is used. Further, a recording SDRAM different from the encoder SDRAM has been used as a recording buffer for the program stream. In addition, in order to confirm the search information of the practical navigation pack,
A recording buffer having a capacity of 32 Mbytes is used to store a program stream of about 0 seconds, and an SDRAM having a low unit price of bits is used for this recording buffer. However, in the related art 1, since two SDRAMs are used to generate the program stream, this is a factor that hinders downsizing and cost reduction.

In recent years, a large-capacity SDRAM has appeared, and it is possible to cover the memory of all blocks of a digital signal processing circuit including a recording buffer with one SDRAM. Reducing the number of SDRAMs used is important from the viewpoint of downsizing and cost reduction.

In order for a plurality of blocks to share and use one SDRAM, it is necessary to use the SDRAM by time division multiplexing for each block. The digital signal processing circuit in the DVD recorder includes a video coding block, an audio coding block, a video elementary stream buffer section, an audio elementary stream buffer section, a program stream recording buffer section, SDRA, etc.
There are many blocks that require the use of M. Determining the time-division-multiplexed use allocation of SDRAM, that is, the slot allocation to each block is a time-consuming and labor-intensive task in circuit design. Reducing the blocks that access the SDRAM is an important issue in circuit design.

As described above, in the prior art 1, at least two SDRAMs are used to generate the program stream. However, if the number of SDRAMs is reduced and one SDRAM is used, the following problems occur. Occurs. In Prior Art 1, since the navigation information is inserted after PS multiplexing, recording SDRA is performed.
There are three types of access to M. These are writing of a program stream generated by multiplexing, writing of search information to a program stream for inserting search information, and reading of a program stream for writing to a DVD-R. Of these accesses, the writing of the search information is an extra SDRAM access that occurs because the prior art 1 is used.
Access makes the design of determining the time-division multiplex use allocation of the SDRAM difficult. Further, since the SDRAM access that has been additionally generated, the bandwidth of the SDRAM access, that is, the amount of data transferred per unit time increases, and a higher speed SDRAM or a plurality of SDRAMs
Had to use. Furthermore, in order to insert search information, it is necessary to write to discontinuous addresses, which complicates the SDRAM I / F circuit. The problem to be solved by the present invention is to provide a moving picture coding apparatus and a moving picture coding method that generate and multiplex record search information in real time without causing extra SDRAM access.

[0012]

In order to solve the above problems, according to the present invention, in a moving picture coding apparatus for performing variable bit rate coding, a video elementary for a time range of search information described in search information. A video elementary stream buffer unit that stores a stream in a buffer memory, a search information generation unit that generates search information, and search information generated in advance in the search information generation unit is inserted into the video elementary stream to generate a program stream. And a PS multiplexing section for P
Since the program information is generated by inserting the search information generated in advance by the search information generation unit when S-multiplexing is performed, access to the SDRAM, which is to write the search information after the program stream is generated, as in the related art 1, is possible. This is unnecessary and can prevent the occurrence of this extra SDAM access, so that the design for determining the use allocation of the time division multiplexing of the SDRAM becomes easy. Further, it is possible to suppress the necessity of using a high-speed SDRAM or a plurality of SDRAMs and prevent the SDRAM I / F circuit from becoming complicated. Therefore, the number of SDRAMs used can be reduced.

Further, in the video encoding unit, the original image for the time range described in the search information is stored in the buffer memory and the simple two-pass encoding is performed, so that a more efficient compressed moving image can be created. Becomes

Further, in the moving picture coding apparatus for performing variable bit rate coding, a search information generating section for generating search information based on the information supplied from the PS multiplexing section,
After reading the program stream from the SDRAM, a pack selector unit for multiplexing with the navigation pack is provided. With this configuration as well, access to the SDRAM for inserting search information in the prior art 1 becomes unnecessary, and it is possible to prevent the occurrence of extra SDAM access.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described. This first embodiment is a DVD-R recorder that performs one-pass variable bit rate encoding. DVD-Vi
Deo standard, DS included in the navigation pack
VOBU to which the navigation pack belongs to I data
Describe the relative start address within 240 VOBU before and after. However, VOB (Vide) that is an aggregate of VOBUs
It is defined that only the relative start address of the VOBU within the range of (oObject) is described. So, for example,
When the VOB is composed of 61 VOBU, it is sufficient to describe the relative start addresses of up to 60 VOBU before and after in the DSI data. In the first embodiment, all GO
P consists of 15 frames, which is about 0.5 seconds, and 1
One VOBU contains one GOP, and all VOs
B is composed of 61 VOBU. Therefore, 1 VO
If B is composed of 61 VOBU, about 30 seconds of search information will be described in the navigation pack. 1
If the VOB is composed of a small number of VOBUs, the searchable range will be shortened, but if 30 seconds of information is described in special playback such as fast-forwarding, it is considered that there will be few practical problems. Set to a certain number.
Of course, it goes without saying that the number may be other than 61 VOBU. FIG. 1 shows a block diagram of the first embodiment. In the first embodiment, the digital moving image input terminal 10 is used.
1. Digital audio input terminal 102, MPEG2 video encoder 103 which is a video encoding unit for encoding an input digital moving image signal to generate encoded image data, and encodes and encodes an input digital audio signal An audio encoder 104, which is a voice encoding unit that generates encoded audio data, and a video ES (a encoded image data buffer unit, which stores at least encoded image data for a time range in which search information is described, in an SDRAM that is a buffer memory. Elementary Stream
m) a buffer unit 105, at least an audio ES buffer unit 106 which is an encoded audio data buffer unit for storing encoded audio data for a time range in which search information is written in an SDRAM which is a buffer memory, search information, that is, navigation information. A navigation information generation unit 107, which is a search information generation unit to be generated, and a PS multiplexing unit 1
08, PS buffer unit 109, DVD as a recording medium
DVD-R drive 11 which is a recording unit for recording on R
0, an SDRAM interface 111, and an SDRAM 112 which is a buffer memory. SDRAM1
In FIG. 12, the memory allocation capacity for each block is conceptually illustrated. The part indicated by the dotted line is the moving picture coding device 113 realized by one chip, and
It is also called a D Recording LSI.

A digital moving image signal is sent from the digital moving image input terminal 101 to the MPEG2 video encoder 10.
Input to 3.

The MPEG2 video encoder 103 performs VBR compression coding of the digital moving picture signal input from the digital moving picture input terminal 101 according to the MPEG2 video standard, outputs the generated video ES to the video ES buffer section 105, and codes each picture. The quantity information is output to the navigation information generation unit 107. In order to perform encoding in accordance with the MPEG2 video standard, a frame memory that stores image information of a plurality of frames is required. The MPEG2 video encoder 103 has an SDRAM interface 1
Through 11, the two types of access to the SDRAM are performed: writing the image information of the frame to the SDRAM 112 and reading the image information of the frame from the SDRAM 112. The MPEG2 video encoder 103 is
The bit rate is controlled by operating the quantization scale defined by the MPEG2 video standard. At this time, without fixing the bit rate, scenes with strong motion and low correlation between frames or scenes with complicated pictures and many high frequency components are coded at a high bit rate, and scenes with small movements and high correlation between frames or pictures However, a scene with flatness and few high frequency components is encoded at a low bit rate. That is, variable bit rate coding is performed in one pass. The MPEG2 video encoder 103 outputs the code amount information for each picture obtained by this variable bit rate encoding to the navigation information generation unit 107.

The video ES buffer unit 105 is an MPEG
2 The video ES input from the video encoder 103 is S
SDRAM 11 through DRAM interface 111
2 in the SDRAM 1 through the SDRAM interface 111 in response to a request from the PS multiplexer 108.
The video ES is read from 12 and output to the PS multiplexing unit 108. That is, the video ES buffer unit 105 uses the SDR
Access to the AM is performed by writing and reading the video ES from the SDRAM 112. SDRAM 112
The buffer allocation capacity of the video ES buffer unit 105 secured inside is 300 Mbits. This capacity is equivalent to 30.5 seconds for a video ES with a maximum bit rate of 9.8 Mbps of DVD-Video standard compressed video,
In other words, it is a capacity that can store at least 61 VOBU.

A digital audio signal is input to the audio encoder 104 from the digital audio input terminal 102.

The audio encoder 104 encodes the digital audio signal input from the digital audio input terminal 102 in accordance with the MPEG1 audio standard and other standards, and outputs the generated audio ES as an audio ES.
It is output to the buffer unit 106. In order to encode voice, a memory that stores a digital voice signal for one audio frame is required. Audio encoder 104
Through the SDRAM interface 111 to SDRA
Writing a digital audio signal to M112 and SDR
The digital audio signal is read from the AM 112. The audio encoder 104 performs encoding at a fixed bit rate. Therefore, the audio encoder 104
Unlike the video encoder 105, it is not necessary to output the code amount information to the navigation information generation unit 107.

The audio ES buffer unit 106 receives the audio ES input from the audio encoder 104 through the SDRAM interface 111 and outputs it to the SDRAM1.
12, and temporarily stores the data in the SDRAM 12 through the SDRAM interface 111 in response to a request from the PS multiplexer 108.
The audio ES is read from 112 and the PS multiplexing unit 10
Output to 8. The buffer allocation capacity of the audio ES buffer unit 106 secured in the SDRAM 112 is 1
It is 4M bits. This capacity is equivalent to DVD-Video
This is a capacity capable of storing the audio ES having the maximum bit rate of 448 kbps of the standard o compressed voice for 30.5 seconds, that is, at least 61 VOBU.

The PS multiplexing unit 108 requests the navigation information generation unit 107, the video ES buffer unit 105, and the audio ES buffer unit 106 to output data, and the navigation information input from the navigation information generation unit 107, Video ES buffer unit 10
The video ES input from the No. 5 and the audio ES input from the audio ES buffer unit 106 are recorded on the DVD-Vi.
A pack is generated according to the deo standard while being multiplexed to generate a program stream, which is output to the PS buffer unit 109. The PS multiplexing unit 108 performs multiplexing so that one VOBU includes one GOP video pack.

The PS buffer unit 109 includes a PS multiplexing unit 10
8 is temporarily stored in the SDRAM 112 through the SDRAM interface 111, and SDRA through the SDRAM interface 111.
Read the program stream from M112, DVD
-Output to the R drive 110. The buffer allocation capacity of the PS buffer unit 109 secured in the SDRAM 112 is set to 5.1 Mbits, which is a capacity for storing a program stream having a maximum bit rate of 10.08 Mbps for 0.5 second, that is, 1 VOBU.

The DVD-R drive 110 inputs the program stream from the PS buffer unit 109 and
-Record on R disc.

The SDRAM interface 111 is an MP
EG2 video encoder 103, audio encoder 104, video ES buffer unit 105, audio ES
Write data input from each of the buffer unit 106 and the PS buffer unit 109 is time-division multiplexed to generate SDRA.
Output to M112. Further, the SDRAM interface 111 separates the read data input from the SDRAM 112 and divides the read data into the MPEG2 video encoder 103, the audio encoder 104, and the video ES buffer unit 10.
5, the audio ES buffer unit 106, and the PS buffer unit 109.

For the SDRAM 112, the SDRAM
Data is read and written under the control of the interface 111. The SDRAM 112 has a memory capacity of 512 Mbits.

The navigation information generator 107 generates the VO in order to create the DSI data of the navigation pack.
Calculate the number of packs for each BU. The procedure for calculating the number of packs for each VOBU is as follows.

The navigation information generation unit 107 uses the MP
The code amount information for each picture is acquired from the EG2 video encoder 103. GO by totaling the amount of data for each picture
The total data amount of P is calculated, and the number of VOBU video packs is calculated from the value. The maximum size of video ES data of the first video pack of VOBU is 2015 bytes,
Since the maximum size of the video ES data of the middle video pack of VOBU is 2025 bytes, when the total amount of data of GOP is GD bytes, the number of video packs VP of VOBU is obtained by the following formula. The result of division is rounded up to the nearest whole number. For rounding up after the decimal point, dummy data called a padding packet is inserted for adjustment. VP = (GD-2015) / 2025 + 1 Since the bit rate of the audio ES is constant, VO
The number of audio packs included in the BU can be determined without acquiring the code amount information regarding the audio ES. For example, if an audio ES for 0.5005 seconds (1 GOP period) is included in VOBU, when the bit rate is 256 kbps, the data amount of the audio ES included in VOBU is 16016 bytes, and the number of audio packs included in VOBU is 8. Can be determined as individual. The total of the number of VOBU video packs and the number of audio packs thus obtained is 1 for the navigation pack.
The number of VOBU packs is obtained by adding.

The navigation information generation unit 107 determines the VOB to which the navigation pack to be generated belongs.
The number of packs of each of 61 VOBUs is stored, the relative start address of each VOBU is obtained from this information, and the DSI data of the navigation pack is generated.
The navigation information generator 107 outputs navigation information including DSI data from the PS multiplexer 108 in response to a request.

FIG. 2 shows a timing chart of the first embodiment. 401 is a time in seconds, and the time when the MPEG2 video encoder 103 starts outputting the video ES of GOP1 is set to 0. Reference numeral 402 denotes the timing at which the MPEG2 video encoder 103 outputs the video ES to the video ES buffer unit 105. It takes about 0.5 seconds to encode each GOP. 403 is M
The timing at which the PEG2 video encoder 103 outputs the data amount of the last picture of each GOP to the navigation information generation unit 107 is shown. Although the data amount is actually output for each picture, only the timing for outputting the data amount of the last picture of each GOP is shown here.

Reference numeral 404 is the navigation information generation unit 107.
Shows the timing of outputting the navigation information to the PS multiplexer 108. The navigation information included in VOBU1 to which GOP1 belongs is N1, and the navigation information to which GOP2 belongs is V
The navigation information included in OBU2 is numbered N2, and is similarly numbered below. Same VO from N1 to N61
It is navigation information of each VOBU included in B.
DS of all navigation packs existing in VOB
The I data is fixed when the pack number of the last VOBU in the VOB is known. In this example, when the code amount information of the last picture of GOP 61 is acquired, VOBU6
The number of packs of 1 is known, and the navigation information from N1 to N61 is confirmed. The information N1 of the navigation pack belonging to VOBU1 starts to be output when the code amount information of the last picture of the GOP 61 is acquired and the information of N1 to N61 is finished. Regarding the information N2 of the navigation pack belonging to VOBU2, the video ES buffer unit 105 transfers the video E of GOP1 to the PS multiplexing unit 108.
After the output of S, the audio ES buffer unit 106
Is an audio E compatible with GOP1 in the PS multiplexer 108.
When the output of S is finished, the output is started. Thereafter, the information N3 to N61 of the navigation pack is similarly
When the video ES buffer unit 105 finishes outputting the video ES of the GOP included in the immediately preceding VOBU to the PS multiplexing unit 108, and the audio ES buffer unit 106 finishes outputting the audio ES corresponding to GOP1 to the PS multiplexing unit 108. Then, output is started.

The video ES buffer unit 405 has a P
The timing at which the video ES is output to the S multiplexing unit 108 is shown. The video ES of GOP1 starts outputting when the navigation information generating unit 107 finishes outputting the information N1 of the navigation pack belonging to VOBU1. After that, in the video ES of GOP2 to GOP61, the navigation information generation unit 107 detects the VOB including the GOP.
When the output of the navigation pack belonging to U is completed, the output is started. Since the MPEG2 video encoder 103 performs encoding at a variable bit rate, GOP
The amount of data changes for each. On the other hand, since the transfer bit rate for outputting the video ES from the video ES buffer unit 105 to the PS multiplexing unit 108 is constant, the data transfer period for each GOP also changes.

Reference numeral 406 denotes the audio ES buffer section 10.
6 shows the timing of outputting the audio ES to the PS multiplexing unit 108, and the video ES buffer unit 10
5 is the same as the timing of outputting the video ES to the PS multiplexing unit 108.

Reference numeral 407 indicates the timing at which the PS multiplexing unit 108 outputs the program stream to the PS buffer unit 109. The transfer period of VOBU1 matches the total of the transfer period of the navigation information N1 and the transfer period of the video ES of GOP1. Note that the transfer period of the video ES and the transfer period of the audio ES are the same, and since the audio ES and the video ES are multiplexed and transferred, the VOB
The transfer period of U1 matches the total of the transfer period of the navigation information N1 and the transfer period of the video ES of GOP1. Navigation information N2 during the transfer period of VOBU2
And the transfer period of the video ES of GOP2. The same applies hereafter, and as a result, the same VOB
The program streams of VOBU1 to VOBU61 belonging to the MPEG2 video encoder 103 are GOP6.
From the time when the data amount of the last picture of 1 is output to the navigation information generation unit 107, it is continuously transferred.
Thereafter, the transfer of the program stream is temporarily stopped, and the program streams of the VOBU 62 to VOBU 122 belonging to the next VOB are the MPEG2 video encoder 10
3 outputs the data amount of the last picture of the GOP 122 to the navigation information generating unit 107, the data is continuously transferred. The same applies to subsequent VOBs.

FIG. 8 shows the slot allocation of the SDRAM in the first embodiment. When one cycle is set to 1280 clocks, writing to the audio encoder 104, writing to the audio ES buffer section, audio
The ES buffer reading, the video ES buffer writing, the video ES buffer reading, the PS buffer writing, and the PS buffer reading are 32 clocks each, and the audio encoder reading and the video encoder reading are 512 times, respectively. It was a clock. The reason why the slot allocation of the video encoder is large is that the video encoder handles the digital image data before compression, so that the bit rate is high and therefore the allocation needs to be large. For example, the bit rate of the image data before compression is 720 (horizontal pixels) × 480 (vertical pixels) × 8 (bit) × 2 (Y, C) × 30 (frames) / (1024 × 1024)
= 158Mbps. On the other hand, since the video ES is already compressed and the bit rate is 9.8 Mbps at the maximum, the slot allocation may be small. As is apparent from FIG. 8, according to the present embodiment, it is not necessary to consider the slot allocation for the access of writing the search information to the program stream, which is performed in the prior art 1. Therefore, the time division multiplexing of the SDRAM is used. It facilitates the design of deciding the allocation.

As described above, in the first embodiment,
The video can be encoded at a variable bit rate to generate a program stream according to the DVD-Video standard having a navigation pack. The access to the SDRAM in the first embodiment is a necessary access even when the navigation pack is not added, and there is no SDRAM access newly generated to generate the navigation pack.

That is, the SDRAM in the first embodiment
The access includes access to an MPEG encoder which is a video encoding block, access to an audio encoder which is an audio encoding block, access to a video ES buffer unit, access to an audio ES buffer unit, and access to a PS buffer unit which is a program stream recording buffer. There is. In the conventional technique 1 as well, access to these 4 blocks is necessary to generate and record the MPEG image, but it is considered that there are at least three types of access to the SDRAM of the last recording buffer, and it is generated by multiplexing. Writing the created program stream and DV
In addition to the reading of the program stream for writing to the D-R, an extra access of writing the search information to the program stream for inserting the search information was necessary. On the other hand, in this embodiment, PS
When multiplexing, the navigation information generated in advance is inserted to generate the program stream. Therefore, in the PS buffer section after the generation of the program stream, access to write search information to the program stream is unnecessary. . Therefore, this extra SDA
Since it is possible to prevent the M access from occurring, the design for determining the use allocation of the time division multiplexing of the SDRAM becomes easy,
The necessity of using a higher speed SDRAM or a plurality of SDRAMs can be suppressed, and the SDRAM I / F circuit can be prevented from becoming complicated.

In this embodiment, the allocated capacity of the SDRAM memory of the video ES buffer section and the audio ES buffer section is large in order to generate search information. On the other hand, in the conventional technique 1, the capacity of the SDRAM memory of the video ES buffer unit and the audio ES buffer unit is considered to be small. However, in the conventional technique 1, the recording buffer has to have a large capacity for inserting the search information. In the present embodiment, since the allocated capacity of the SDRAM of the PS buffer is conversely reduced, the SDRAM capacity as a whole is reduced to that of the conventional technique 1.
It is not necessary to increase the number of SDRAMs in this embodiment as compared with the above, and the number of SDRAMs can be reduced according to this embodiment.

In the first embodiment, the MPEG2 video encoder 103 uses the navigation information generator 107.
I tried to output the code amount for each picture to MPE.
The G2 video encoder 103 may output the video ES to the navigation information generation unit 107, collect the video ES input by the navigation information generation unit 107, and obtain the code amount for each picture. Further, the video ES buffer unit 105 may total the video ES to obtain the code amount for each picture, and output the code amount to the navigation information generation unit 107. Also, the PS multiplexing unit 108 has the same V
Although the program stream belonging to the OB is continuously generated and output, it may be generated and output intermittently so that data of 1 VOBU or more is transferred in 0.5 seconds.

Next, a second embodiment of the present invention will be described. The second embodiment is a DVD-R recorder that performs simple 2-pass variable bit rate encoding. The 2-pass variable bit rate coding is a coding method in which an original image is coded twice and bit rate allocation is optimized. In the first encoding, the quantization scale is fixed and encoding is performed, and the generated data amount is analyzed to evaluate the complexity of the image of the GOP and determine the target data amount of the GOP. In the second encoding, encoding is performed according to the determined target data amount, and the generated bitstream is recorded. The two-pass variable bit rate encoding cannot be adopted in a DVD recorder that records in real time, because the original image needs to be encoded twice. Therefore, in the second embodiment, a buffer memory for storing the original image for 30.5 seconds is provided, and 2-pass variable bit rate encoding is easily performed by using the delay time due to the buffer.

In the second embodiment, as in the first embodiment, all GOPs are made up of 15 frames for about 0.5 seconds, and one GOP is included in one VOBU. All VOBs shall consist of 61 VOBUs.

FIG. 3 shows a block diagram of the second embodiment.
In the second embodiment, a digital moving image input terminal 101, a digital audio input terminal 102, a first MPEG2 video encoder 201, a hard disk drive 202, a second MPEG2 video encoder 203, an audio encoder 104, a video ES buffer section 105, an audio ES. Buffer unit 106, navigation information generation unit 1
07, PS multiplexing unit 108, PS buffer unit 109, DV
DR drive 110, SDRAM interface 11
1 and SDRAM 112. The same parts as those of the first embodiment are designated by the same reference numerals. Digital voice input terminal 102, audio encoder 10
4, audio ES buffer unit 106, PS multiplexing unit 10
8, PS buffer unit 109, DVD-R drive 11
0, SDRAM interface 111, SDRAM 11
Since the operation of each unit of 2 is the same as that of the first embodiment, the description thereof will be omitted. Hereinafter, a part different in operation from the first embodiment will be described.

From the digital moving image input terminal 101, a digital moving image signal is input to the first MPEG2 video encoder 201 and the hard disk drive 202.

The MPEG2 video encoder 201 compresses and encodes the digital moving image signal input from the digital moving image input terminal 101 according to the MPEG2 video standard with the quantization scale fixed. The MPEG2 video encoder 201 analyzes the amount of data generated in 61 GOPs each time the coding of 61 GOPs is completed, and G
The image complexity of the OP is evaluated to determine the target amount of data for each GOP. Then, the navigation information generation unit 10
7 is notified of the target data amount of all 61 GOPs, and the second MPEG2 video encoder 203 is notified of the target data amount of each GOP in a cycle of 0.5 seconds.

The hard disk drive 202 temporarily stores the digital moving image signal input from the digital moving image input terminal 101, delays it for 30.5 seconds, and MPEG2
Output to the video encoder 203.

Second MPEG2 video encoder 203
Is a digital moving image signal input from the hard disk drive 202, which is VB according to the MPEG2 video standard.
Video ES generated by R compression encoding is generated once as a video ES
It is output to the PS multiplexing unit 108 after being held in the buffer unit. The MPEG2 video encoder 203 controls the code amount for each picture so that the data amount for each GOP matches the target data amount for each GOP designated by the MPEG2 video encoder 201, and performs encoding. Here, unlike the first embodiment, the video ES buffer unit 105 uses the SDR.
The buffer capacity secured in AM112 is much smaller,
Video ES with a maximum bit rate of 9.8 Mbps is 0.5
4.9 Mbits, which is the capacity that can be stored per second, is sufficient.

The navigation information generator 107 operates similarly to the case of the first embodiment. The difference is that the actual code amount information for each picture is acquired and operated in the case of the first embodiment, whereas the target data amount for each GOP is acquired and operated in the case of the second embodiment. is there.

FIG. 4 shows a timing chart of the second embodiment. 501 is the time in seconds, which is the first MPEG
The time when the 2 video encoder 201 starts encoding GOP1 is set to 0. Reference numeral 502 indicates the timing at which the first MPEG2 video encoder 201 performs encoding. It takes about 0.5 seconds to encode each GOP.

Reference numeral 503 represents the timing at which the first MPEG2 video encoder 201 outputs each GOP target data amount to the second MPEG2 video encoder 203. The first MPEG2 video encoder 201 is GO
GOP1 to GOP61 at the time when the encoding of P61 is completed
The amount of data generated in GOP1 is analyzed and the target amount of data for each GOP is determined.
Notify the video encoder 203. After that, the target data amount of the next GOP is notified at 0.5 second intervals.

Reference numeral 504 indicates the timing at which the second MPEG2 video encoder 203 outputs the video ES to the video ES buffer section 105. The encoding is started from the time when the target data amount of each GOP is acquired, and the video ES is output. It takes about 0.5 seconds to encode each GOP.

In 505, the first MPEG2 video encoder 201 sends each GOP to the navigation information generator 107.
It shows the timing of outputting the target data amount of. M
The PEG2 video encoder 201 determines the target data amount for each GOP at the time when the encoding of the GOP 61 is completed,
The target data amounts of GOP1 to 61 are notified at once.

Reference numeral 506 is a navigation information generator 107.
Shows the timing of outputting the navigation information to the PS multiplexer 108. The navigation information included in VOBU1 to which GOP1 belongs is N1, and the navigation information to which GOP2 belongs is V
The navigation information included in OBU2 is numbered N2, and is similarly numbered below. Same VO from N1 to N61
It is navigation information of each VOBU included in B.
MPEG2 video encoder 201 to GOP1 to GO
When the target data amount of P61 is acquired at one time, the navigation information from N1 to N61 is determined. VOB
The information N1 of the navigation pack belonging to U1 is N1.
The output is started when the navigation information from N1 to N61 is determined. Information N2 of the navigation pack belonging to VOBU2 is stored in the video ES buffer unit 105 as PS.
The output of the video ES of GOP1 to the multiplexing unit 108 is completed, and the audio ES buffer unit 106 is changed to the PS multiplexing unit 108.
When the output of the audio ES corresponding to GOP1 is finished, the output is started. Thereafter, in the information N3 to N61 of the navigation pack, similarly, the video ES buffer unit 105 finishes the output of the video ES of the GOP included in the immediately preceding VOBU to the PS multiplexing unit 108, and the audio ES.
When the buffer unit 106 finishes outputting the audio ES corresponding to the GOP to the PS multiplexing unit 108, the output is started.

In 507, the video ES buffer unit 105 has P
The timing at which the video ES is output to the S multiplexing unit 108 is shown. The timing at which the audio ES buffer unit 106 outputs the audio ES to the PS multiplexing unit 108 is also equivalent to this, so the drawing is omitted. For the video ES of GOP1, the MPEG2 video encoder 203 uses the video E.
When the video ES of GOP1 is output to the S buffer unit 105, the output is started. After that, GOP2 to GOP
The video ES 61 is an MPEG2 video encoder 20.
When the 3 finishes outputting the GOP to the video ES buffer unit 105, the output is started. Since the MPEG2 video encoder 203 performs encoding at a variable bit rate,
The amount of data for each GOP changes. On the other hand, the transfer bit rate for outputting the video ES from the video ES buffer unit 105 to the PS multiplexing unit 108 is constant, and the data transfer period for each GOP also changes.

Reference numeral 508 indicates the timing at which the PS multiplexing unit 108 outputs the program stream to the PS buffer unit 109. The transfer period of VOBU1 matches the total of the transfer period of the navigation information N1 and the transfer period of the video ES of GOP1. However, a transfer suspension period may exist between the two. The transfer period of VOBU2 matches the total of the transfer period of the navigation information N2 and the transfer period of the video ES of GOP2. The same applies to the subsequent VOBU3 to VOBU61. The program streams of VOBU62 to VOBU122 are output at the same timing as VOBU1 to VOBU61. The same applies to subsequent VOBUs.

As described above, in the second embodiment,
The video can be encoded at a variable bit rate to generate a program stream according to the DVD-Video standard having a navigation pack. The access to the SDRAM in the second embodiment is the same as the access in the first embodiment, and as described in the first embodiment, the access to the SDRAM is a necessary access even if the navigation pack is not added. Yes,
There is no newly generated SDRAM access to create the navigation pack. Further, the second embodiment is characterized in that the data amount allocation to each GOP is more optimal and the image quality is improved as compared with the first embodiment.

In the second embodiment, the first MPEG
Although the two-video encoder 201 outputs the target data amount for each GOP, it may output the target data amount for each picture. Further, SDRAM may be used instead of the hard disk drive 202. In addition, the navigation information generation unit 107 uses the PS multiplexing unit 10
The video ES buffer unit 105 outputs the navigation information to the PS multiplexer unit 108 immediately before the V
It suffices that the time is from the time when the output of the video ES of the GOP included in the OBU is finished to the time when the output of the video ES of the next GOP is started.

Finally, a third embodiment of the present invention will be described. The third embodiment is a DVD-R recorder that performs 1-pass variable bit rate encoding. Also in the third embodiment, as in the first embodiment, all GOPs are composed of 15 frames which are about 0.5 second, and one GOP is included in one VOBU, and all VOBs are included. 61 VOB
Consists of U.

FIG. 5 shows a block diagram of the third embodiment.
In the third embodiment, a digital moving image input terminal 101, a digital audio input terminal 102, an MPEG2 video encoder 103, an audio encoder 104, a video ES.
A buffer unit 105, an audio ES buffer unit 106,
PS multiplexing unit 108, PS buffer unit 109, DVD-R
Drive 110, SDRAM interface 111, S
DRAM 112, navigation pack generation unit 301,
It is composed of a pack selector 302. The same parts as those of the first embodiment are designated by the same reference numerals. Digital moving image input terminal 101, digital audio input terminal 1
02, MPEG2 video encoder 103, audio encoder 104, DVD-R drive 110, SDR
The operation of each unit of the AM interface 111 and the SDRAM 112 is the same as that of the first embodiment, and thus the description thereof is omitted.
The operation of the MPEG2 video encoder 103 is basically the same, except that the code amount for each picture is not output. Hereinafter, a part different in operation from the first embodiment will be described.

The video ES buffer section 105 and the audio ES buffer section 106 operate in the same manner as in the first embodiment. What is different from the first embodiment is the capacity of each buffer. In the case of the first embodiment, a capacity capable of storing the ES having the highest bit rate for 30.5 seconds was required, but in the case of the third embodiment, the minimum necessary for the PS multiplexer 108 to perform multiplexing. The buffer capacity of For example, the capacity of the video ES buffer section secured in the SDRAM 112 is 4.9 Mbits which is a capacity capable of storing the video ES having the maximum bit rate of 9.8 Mbps for 0.5 seconds, and the capacity of the audio ES buffer section secured in the SDRAM 112 is 672k, which is the capacity to store audio ES with the maximum bit rate of 448kbps for 1.5 seconds
A bit is enough.

The PS multiplexing unit 108 requests the video ES buffer unit 105 and the audio ES buffer unit 106 to output data, and outputs the video ES input from the video ES buffer unit 105 and the audio ES buffer unit 106. Input audio ES to DVD-
The program stream is multiplexed according to the Video standard to generate a program stream, which is output to the PS buffer unit 109. here,
Since the navigation pack is not added to the program stream output by the PS multiplexing unit 108, it is not a program stream that completely complies with the DVD-Video standard. The PS multiplexing unit 108 also outputs the pack number information for each VOBU to the navigation pack generating unit 301. The pack number information for each VOBU includes the number of navigation packs.

The PS buffer unit 109 includes a PS multiplexing unit 10
8 is temporarily stored in the SDRAM 112 through the SDRAM interface 111, and the SDRAM 1 is transmitted through the SDRAM interface 111 according to the instruction of the navigation pack generation unit 301.
The program stream is read from 12 and output to the DVD-R drive 110 via the pack selector 302. The capacity of the PS buffer unit 109 is 10.08 Mb
The ps program stream is 308 Mbits, which is the capacity that can be stored for 30.5 seconds.

The navigation pack generator 301 is a VO to which the navigation pack to be generated belongs.
The number of packs of each of 61 VOBUs in B is stored, the relative start address of the VOBU is obtained from this information, and the DSI data of the navigation pack is generated.
In addition, when outputting the generated navigation pack to the pack selector 302, a select control signal is output to the pack selector 302 to instruct to select and output the navigation pack. When the navigation pack generation unit 301 finishes outputting the navigation pack to the pack selector 302, the PS buffer unit 109
To the pack selector 302 to instruct the pack selector 302 to output the program stream of the VOBU corresponding to the navigation pack.
It instructs to select and output the program stream output by the buffer unit 109.

The pack selector 302, in accordance with the instruction from the navigation pack generation unit 301, receives the navigation pack input from the navigation pack generation unit and PS.
Either one of the program streams input from the buffer unit 109 is selected and output to the DVD-R drive 110.

FIG. 6 shows a timing chart of the third embodiment. Reference numeral 601 denotes a time in seconds, and the time when the MPEG2 video encoder 103 starts to output the video ES of GOP1 is 0. Reference numeral 602 indicates the timing at which the MPEG2 video encoder 103 outputs the video ES to the video ES buffer unit 105. It takes about 0.5 second to encode each GOP.

In 603, the video ES buffer unit 105 is set to P
The timing at which the video ES is output to the S multiplexing unit 108 is shown. The audio ES buffer unit 106 outputs the audio ES to the PS multiplexing unit 108 at the same timing. The video ES buffer unit 105 converts the video ES input from the MPEG2 video encoder 103 to 0.5
Output with a delay of 2 seconds. MPEG2 video encoder 10
No. 3 encodes at a variable bit rate, so the data amount for each GOP changes. On the other hand, the video ES buffer unit 10
Since the transfer bit rate for outputting the video ES from 5 to the PS multiplexing unit 108 is constant, the data transfer period for each GOP also changes.

Reference numeral 604 indicates the timing at which the PS multiplexing unit 108 outputs the program stream to the PS buffer unit 109. VOB without navigation pack
The number added to U (denoted as VOBU ') is VOB
It is attached so as to match the GOP number included in U.
For example, it is VOBU'1 that includes GOP1, and GO
It is VOBU'2 that includes P2. GOP Video E
The transfer timing of S and the transfer timing of the program stream of the corresponding VOBU ′ substantially match. This is because the video ES has a higher bit rate than the audio ES, and the video ES occupies most of the program stream.

Reference numeral 605 indicates the timing at which the PS multiplexing unit 108 outputs the number of packs for each VOBU to the navigation pack generation unit 301. The number of packs for each VOBU is
It is determined when the PS multiplexing unit 108 finishes multiplexing VOBU ′. The PS multiplexing unit 108 has a PS buffer unit 109.
When the output of the program stream of each VOBU ′ is completed, the number of packs of VOBU is output to the navigation pack generation unit 301.

Reference numeral 606 is the navigation pack generator 30.
1 indicates the timing of outputting the navigation pack to the pack selector 302. The navigation information included in VOBU1 is N1 and the navigation information included in VOBU2 is N2. Each V included in the same VOB from N1 to N61
This is navigation information of OBU. The DSI data of all navigation packs existing in the VOB is VO
It is determined when the pack number of the last VOBU in B is known. In this example, the navigation information from N1 to N61 is determined when the number of packs of the VOBU 61 is acquired. The information N1 of the navigation packs belonging to VOBU1 is obtained from N1 to N by acquiring the number of packs of VOBU61.
When the information up to 61 has been generated, the output is started. Information N of the navigation pack belonging to VOBU2
In No. 2, when the PS buffer unit 109 finishes outputting the VOBU′1 program stream to the pack selector 302, the output starts. Thereafter, the navigation pack information N3 to N61 starts to be output when the PS buffer unit 109 finishes outputting the immediately preceding VOBU program stream to the pack selector 302.

Reference numeral 607 denotes the navigation pack generator 30.
1 indicates the timing of outputting the select control signal to the pack selector 302. The navigation pack generation unit 301 sets the select control signal to the high level while outputting the navigation pack to the pack selector 302. During other periods, the select control signal is set to low level.

Reference numeral 608 denotes the timing at which the PS buffer unit 109 outputs the program stream to the pack selector 302 according to the instruction from the navigation pack generation unit 301. When the navigation pack generation unit 301 finishes outputting the navigation pack to the pack selector 302, the PS buffer unit 109 outputs the VOBU program stream to which the navigation pack belongs to the pack selector 302. When the output of the navigation pack N1 belonging to VOBU1 is completed, the VOB
The output of the program stream of U'1 is started. Similarly, when the output of N2 and N3 is completed, VO
Output of the program stream of BU'2 and VOBU'3 is started. The same applies to subsequent VOBUs.

In 609, the pack selector 302 is a DVD-
The timing for outputting the program stream to the R drive 110 is shown. The pack selector 302 uses the navigation pack input from the navigation pack generation unit 301 when the select control signal is high level, and the PS buffer unit 10 when the select control signal is low level.
The program stream input from 9 is selected and output. The program stream output from the pack selector 302 to the DVD-R drive has a format compatible with the DVD-Video standard with a navigation pack added. As a result, VOBs that belong to the same VOB
The program streams of U1 to VOBU61 are continuously transferred from the time when the navigation pack generation unit 301 acquires the number of packs of VOBU61. Transfer of the program stream is temporarily stopped, and the V that belongs to the next VOB is
For the program streams of OBU62 to VOBU122, the navigation pack generation unit 301 uses VOBU12.
Transfer is continuously performed from the time when the number of packs of 2 is acquired. The same applies to subsequent VOBs. The DVD-R drive 110 according to the present embodiment can accept such continuous data transfer and write data to the DVD-R disc.

As described above, in the third embodiment,
The video can be encoded at a variable bit rate to generate a program stream according to the DVD-Video standard having a navigation pack. The access to the SDRAM in the third embodiment is a necessary access even if the navigation pack is not added, and there is no SDRAM access newly generated to generate the navigation pack.

In the third embodiment, the PS multiplexing unit 10
8 outputs the VOBU pack to the navigation pack generation unit 301, the PS multiplexing unit 108 outputs the video ES to the navigation pack generation unit 301,
The number of VOBU packs may be calculated by totaling the program streams input by the navigation pack generation unit 301. Alternatively, the PS buffer unit 109 may total the program streams, obtain the number of VOBU packs, and output the number to the navigation pack generation unit 301. Further, the DVD-R drive 110 may issue a data transfer request to the navigation pack generation unit 301 and output the program stream accordingly.

In the first and second embodiments described above, the audio encoder 104 and the audio E
S buffer unit 106, navigation information generation unit 10
7, each of the PS multiplexing unit 108 and the PS buffer unit 109 may be realized by a general-purpose CPU and software. In the third embodiment, the audio encoder 104,
Audio ES buffer unit 106, navigation information generation unit 107, PS multiplexing unit 108, PS buffer unit 10
Each unit of 9 may be realized by a general-purpose CPU and software. Although the encoder has been described in the present embodiment, a decoder for decoding coded moving image data and audio data may be provided in the moving image encoding device to be integrated into one chip so that the decoder can share the SDRAM, and the decoder can also be used. If it is made into one chip, the size can be further reduced.

In the above embodiment, an example in which a digital image signal and a digital audio signal are encoded and recorded on a recording medium such as a DVD has been described, but FIGS. 1, 3 and 5 are applied to a DVD recorder and a camera, respectively. Can be applied. When applied to a DVD recorder, a tuner, an external input terminal, an image signal processing unit that processes an image signal input from the tuner or the external input terminal, an audio signal processing that processes an audio signal input from the tuner or the external input terminal A digital moving image signal output from the image signal processing unit and an audio signal output from the audio signal processing unit are input to the digital moving image input terminal 101 and the digital audio input terminal 102. Become. According to the present embodiment, the design for determining the use allocation of the time division multiplexing of the SDRAM becomes easy, which leads to cost reduction and contributes to the miniaturization of the device. When applied to a camera, an imaging device, a microphone, an image signal processing unit that converts the signal output from the imaging device into a digital signal, and an audio signal processing unit that converts the sound captured by the microphone into a digital signal. Therefore, the digital moving image signal output from the image signal processing unit and the audio signal output from the audio signal processing unit are input to the digital moving image input terminal 101 and the digital audio input terminal 102. According to this embodiment, the same effect as when applied to a DVD recorder can be obtained. Further, since the number of SDRAMs can be reduced and the size can be reduced, the effect described in this embodiment is great for a product such as a camera that is required to be downsized.

[0076]

As described above, according to the present invention,
A navigation pack can be generated without causing an extra SDRAM access, and a program stream according to the DVD-Video standard can be generated in real time.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment.

FIG. 2 is a timing chart of the first embodiment.

FIG. 3 is a block diagram of a second embodiment.

FIG. 4 is a timing chart of the second embodiment.

FIG. 5 is a block diagram of a third embodiment.

FIG. 6 is a timing chart of the third embodiment.

FIG. 7 is an explanatory diagram of a navigation pack.

FIG. 8 is a diagram showing slot allocation of the SDRAM in the first embodiment.

[Explanation of symbols]

101 ... Digital moving image input terminal 102 ... Digital audio input terminal 103 ... MPEG2 video encoder 104 ... Audio encoder 105 ... Video ES buffer section 106 ... Audio ES buffer section 107 ... Navigation information generating section 108 ... PS multiplexing section 109 ... PS buffer section 110 ... DVD-R drive 111 ... SDRAM interface 112 ... SDRAM 113 ... Moving picture coding device 201 ... MPEG2 video encoder 202 ... Hard disk drive 301 ... Navigation pack generation unit 302 ... Pack selector 401 ... Time in seconds 402 ... MPEG2 video encoder 103 Video E
S output timing 403 ... Navigation information generation output timing of MPEG2 video encoder 103 404 ... Navigation information output timing of navigation information generation unit 405 ... Video ES output timing of video ES buffer unit 406 ... Audio ES output timing of audio ES buffer unit 105 407 ... Program stream output timing 501 of PS multiplexer 108 ... Time 502 in units of seconds 502 ... Encoding timing 503 of first MPEG2 video encoder 201 ... GOP of first MPEG2 video encoder 201 for second MPEG2 video encoder 203
Output timing 504 of target data amount ... Video ES output timing 505 of second MPEG2 video encoder 203 ... Output timing 506 of target data amount of GOP to navigation information generation unit 107 of first MPEG2 video encoder 201 ... Navigation information generation unit Navigation information output timing 507 ... Video ES output timing 508 of the video ES buffer unit 508 ... Program stream output timing 601 of the PS multiplexing unit 601 ... Time 602 in seconds ... Video E of the MPEG2 video encoder 103
S output timing 603 ... Video ES output timing 604 of video ES buffer unit 105 ... Program stream output timing 605 of PS multiplexing unit 605 ... Output timing 606 of number of packs for each VOBU of PS multiplexing unit 108 ... Navigation of navigation pack generation unit 301 Information output timing 607 ... Select control signal output timing of navigation pack generation unit 301 608 ... Program stream output timing 609 of PS buffer unit 109 ... Program stream output timing of pack selector 302

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H03M 7/40 H04N 5/85 Z 5J064 H04J 3/00 5/907 B 5K028 H04N 5/85 5/92 H 5/907 7/13 Z 7/24 G11B 27/02 K (72) Inventor Yukuri Tsuboi 3-16-16, Shinmachi, Ome-shi, Tokyo Hitachi Ltd. Device Development Center (72) Inventor Hideo Arai Tokyo 3 16-3 Shinmachi, Ome-shi F-term in Hitachi Device Development Center (Reference) 5C052 AA02 AA17 AB03 AB04 CC06 DD04 GA04 GA07 GA09 GB06 GC05 GF01 5C053 FA24 FA27 GB06 GB38 LA11 5C059 MA00 PP04 RB01 RB15 RC00 RC32 SS13 SS17 SS17 SS17 SS19 TA00 TB03 TC18 UA02 UA32 UA36 UA38 5D044 AB05 AB07 BC05 CC06 DE02 DE03 DE12 DE24 DE25 DE38 DE39 DE54 EF05 GK08 GK12 5D110 AA16 AA27 AA2 9 BB25 BB27 CA05 CA06 CA07 CA42 CF05 DA02 DA04 DA11 DB02 5J064 AA05 BA09 BB05 BC01 BC02 BC25 BD03 5K028 AA12 EE03 EE08 KK01 LL15 SS04 SS24

Claims (19)

[Claims] 1. A moving picture coding apparatus for coding a moving picture signal by using a buffer memory, and multiplexing the moving picture signal with search information for searching the moving picture signal and recording the multiplexed information on a recording medium. A video encoding unit that encodes an image signal to generate encoded image data; an encoded image data buffer unit that stores encoded image data for at least a time range describing search information in the buffer memory; and search information A search information generating section for generating the search information, and a multiplexing section for inserting the search information generated by the search information generating section into the coded image data read from the buffer memory by the coded image data buffer section. And a moving picture coding device. 2. A moving picture coding apparatus for coding a moving picture signal by using a buffer memory, and multiplexing the same with navigation information and recording the same on an optical disk, wherein the inputted moving picture signal is coded and the video elementary. An MPEG2 video encoder for generating a stream; a video elementary stream buffer unit for storing at least a time range video elementary stream describing navigation information in the buffer memory; a navigation information generating unit for generating navigation information; A moving picture coding apparatus, comprising: a multiplexing unit that inserts the navigation information generated by the navigation information generation unit into a video elementary stream read from a buffer memory to generate a program stream. 3. The moving picture coding apparatus according to claim 1, wherein a sound coding unit that codes input sound signals to generate coded sound data, and a time range in which at least search information is described. Coded voice data buffer section for storing a minute of coded voice data in the buffer memory, the multiplexing section includes the search information, the coded image data, and the coded voice data buffer section. A moving picture coding apparatus characterized by multiplexing coded audio data read from a buffer memory. 4. The moving picture coding apparatus according to claim 2, wherein an audio encoder that codes an input audio signal to generate an audio elementary stream, and at least a time range for describing navigation information. An audio elementary stream buffer unit for storing an audio elementary stream in the buffer memory, wherein the multiplexing unit reads the navigation information, the video elementary stream, and an audio elementary stream read from the buffer memory. A moving picture coding apparatus, characterized in that a program stream is generated by multiplexing with a stream. 5. The moving picture coding apparatus according to claim 1, wherein the multiplexed signal output from the multiplexing unit is written in the buffer memory, and the multiplexed signal written in the buffer memory is read out. An image coding apparatus comprising a program stream buffer unit for outputting to a recording unit for recording on the recording medium. 6. The moving picture coding apparatus according to claim 2, wherein the program stream output from the multiplexing unit is written in the buffer memory, and the multiplexed signal written in the buffer memory is read out. An image encoding apparatus comprising a program stream buffer unit for outputting to a recording unit for recording on the optical disc. 7. The moving picture coding apparatus according to claim 1, wherein the search information generation unit is configured to perform the search based on code amount information from the video coding unit. A moving picture coding apparatus characterized by generating search information. 8. The moving picture coding apparatus according to claim 2, wherein the navigation information generation unit is based on code amount information for each picture from the MPEG2 video encoder. A moving picture coding device, characterized in that the navigation information is generated by using the moving picture coding device. 9. The moving picture coding apparatus according to claim 1, wherein the search information generating section is provided from the video coding section or the coded image data buffer section. A moving picture coding apparatus, wherein the search information is generated based on inputted coded image data. 10. The moving picture coding apparatus according to claim 2, wherein the navigation information generation unit inputs from the MPEG2 video encoder or the video elementary stream buffer unit. A moving picture coding device, characterized in that it generates navigation information based on a generated video elementary stream. 11. The moving picture coding apparatus according to claim 1, further comprising a second video coding unit that obtains a target coding amount of the input image. The moving picture coding apparatus, wherein the search information generating section generates search information based on the target coding amount information from the second video coding section. 12. The moving picture coding apparatus according to claim 2, wherein the second MP calculates a target coding amount of the input picture.
An EG2 video encoder is provided, and the navigation information generation unit includes the second MPEG.
2. A moving picture coding apparatus, wherein navigation information is generated from a video encoder based on target code amount information. 13. A moving picture coding apparatus for coding a moving picture signal using a buffer memory, and multiplexing the moving picture signal with search information for searching the moving picture signal and recording the multiplexed information on a recording medium. A video encoding unit that encodes an image signal to generate encoded image data, an encoded image data buffer unit that stores the encoded image data in the buffer memory, and encodes and encodes an input audio signal. An audio encoding unit for generating audio data, an encoded audio data buffer unit for storing the encoded audio data in the buffer memory, and an encoded image read from the buffer memory by the encoded image data buffer unit. A multiplexing unit that multiplexes data and the encoded voice data read from the buffer memory by the encoded voice data buffer unit; A search information generation unit for generating search information from the supplied code amount information; and a program stream buffer unit for writing the multiplexed data multiplexed by the multiplexing unit in the buffer memory and reading the multiplexed data written in the buffer memory. A multiplex data input from the program stream buffer unit, and a pack selector that selects the search information input from the search information generation unit and outputs the data to the recording unit that writes to the recording medium. And a moving picture coding device. 14. Claims 1, 3, 5, 7, 9, 11, 13
The moving picture coding apparatus according to any one of claims 1 to 4, wherein the video coding unit performs variable bit rate coding for variably controlling a bit rate. 15. The moving picture coding device according to claim 2, wherein the M
The PEG2 video encoder performs variable bit rate coding for variably controlling the bit rate, which is a moving image coding apparatus. 16. A tuner, an external input terminal, an image signal processing unit for processing a signal input from the tuner or the external input terminal to generate a moving image signal, and an input from the tuner or the external input terminal. A DVD-R recording device comprising: an audio signal processing unit for processing the generated signal to generate an audio signal; and the moving image encoding device according to claim 1. . 17. An image pickup device, an image signal processing unit for processing an image signal output from the image pickup device to generate a moving image signal, a microphone, and a sound signal obtained by processing a sound captured by the microphone. A camera, comprising: an audio signal processing unit for generating a video signal; and the moving picture coding device according to claim 1. 18. A moving picture coding method for coding a moving picture signal and an audio signal respectively, and multiplexing them with search information for fast-forwarding and recording them on an optical disc, wherein the inputted moving picture signal is coded. Video coding step for generating an elementary stream, audio coding step for coding an input audio signal to generate an audio elementary stream, and a video elementary for a time range in which search information for fast-forwarding is described In the video elementary stream accumulation step of storing the stream in the buffer memory, the audio elementary stream accumulation step of accumulating the audio elementary stream of the time range describing the search information for fast-forwarding in the buffer memory, and the video encoding step. Encoding And a search information generating step for generating search information for fast-forwarding from code amount information or code amount information of the video elementary stream accumulated in the video elementary stream accumulating step, and the search information generated in the search information generating step, A moving picture coding method comprising: a video elementary stream accumulated in the video elementary stream accumulating step, and a multiplexing step of multiplexing the audio elementary stream accumulated in the audio elementary stream accumulating step. 19. A moving picture coding method for coding a moving picture signal and an audio signal respectively, and multiplexing them together with search information for fast-forwarding and recording them on an optical disc, wherein the inputted original picture is coded to obtain a second video image. The first video encoding step that determines the target data amount of the encoding step section, the original image delay step that delays the original image by the time range that describes the address information for fast-forwarding, and the original image delay step that delays the original image. A second video coding step of coding the original image according to the target data amount defined by the first video coding step, and an audio elementary stream storing an audio elementary stream of a time range in which search information for fast-forwarding is described The search information for fast-forwarding is generated from the storage step and the target data amount defined by the first video encoding step. And a search information generation step for reproducing the search information generated in the search information generation step, the video elementary stream generated in the second video coding step, and the audio elementary stream accumulated in the audio elementary stream accumulation step. And a multiplex step for performing the moving picture coding method.