JP3531324B2 - Encoding / multiplexing apparatus, multiplexing preprocessing apparatus, and encoding / multiplexing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coding / multiplexing device used for generating a multiple bit stream according to a digital coding standard such as MPEG.
The present invention relates to a multiplexing preprocessing device and an encoding / multiplexing method.

For example, all kinds of video materials such as movie sources, music video sources, etc. are targeted, and images of the video materials and sounds (including surround, if desired) corresponding to the images, dubbing in a plurality of languages, Each of the related information such as subtitles in a plurality of languages is MPEG2, M
Individually encoded bit stream generated according to the PEG audio standard is time-division multiplexed to generate a multiplexed bit stream, which is used for digital recording on storage media such as optical disks, magneto-optical disks, and magnetic tapes. The present invention relates to an encoding / multiplexing device, a multiplexing preprocessing device, and an encoding / multiplexing method.

[0003]

2. Description of the Related Art First, in order to facilitate understanding of the present invention, an MPEG2 (Moving Picture Experts Group) system for multiplexing multimedia related to the present invention and a finally generated multiple bit stream. Will be explained.

[MPEG System for Multiplexing Multimedia] Generation of a multiple bit stream in the MPEG system includes an encoded stream (bit string) of MPEG video or MPEG audio, and other encoded streams including synchronization. Integrated and integrated into one,
The stream is in a data format that conforms to the unique format of the storage medium or network.

The MPEG standard that defines this is the CD-
MPEG1 which is a standard for storage media such as ROM
And MPEG2, which is a standard for a wide range of applications including MPEG1 applications, and the present invention mainly uses MPEG2. Also, M
Regarding the multiplexing of the PEG2 system, a program stream (progra
m stream, MPEG2-PS, and a transport stream that can configure multiple programs simultaneously
t stream, MPEG2-TS),
The present invention mainly utilizes MPEG2-PS.

FIG. 7 shows a system configuration diagram for understanding the basic functions of the MPEG2 system. This system includes a coding device 1 including a video encoder (encoder) 7 and an audio encoder (encoder) 7 ', and a multiplexer (MUX Multiplexer) 5 that multiplexes outputs of the video encoder and the audio encoder. And a transmission means 21 such as a storage medium for recording a multi-bit stream from this multiplexing device or a cable or network for transmission.
A demultiplexer 23 for separating a multi-bit stream recorded on a storage medium or transmitted via a network or the like, and a video decoder (decoder) 27 for decoding the separated encoded data.
And a decoding device 25 consisting of an audio decoder 27 '.

The operation of this system is as follows.
Video and audio individual materials (source signals) are video encoder 7 and audio encoder 7'of the encoding device 1.
, And are encoded and compressed individually according to the MPEG2 standard while maintaining their cooperation. Multiplexer 5 encodes each encoded individual stream (data string)
Then, the data is multiplexed and recorded in conformity with the format of the storage medium of the stream, the transmission network specifications, etc. That is, a plurality of individual coded streams are time-division multiplexed into one stream. In the case of a DVD (Digital Video Disc) that uses a storage medium as a transmission means,
The case of DVB (Digital Video Broadcast) used for broadcasting is considered, and the present invention is directed to both.

The multiple bit stream is separated by the separating device 23.
Then, each individual stream (data string) part of video, audio, etc. is separated, and the decoder 27 of the decoding device 25
27 'respectively. The video decoder 27 and the audio decoder 27 'of the decoding device 25 synchronously decode the individual streams on the decoding device 25 side, as intended on the multiplexing device 5 side. The individual signal decoded by each decoder is output by an output device (television monitor, speaker, etc.).

(Multiplexing / Demultiplexing / Synchronizing Method) The multiplexing / demultiplexing / synchronizing method will be schematically described with reference to FIG. MPEG2 for generation of multiple bit streams
The system employs a packet-based multiplexing method that is used in many time-division multiplexing methods.

As shown in FIG. 8 (1), the term "multiplexing by packet" means that, for example, when data such as video and audio is multiplexed, each of video, audio and the like is called a stream of a suitable length called a packet. This is a method of dividing into (bit string), attaching additional information such as a header, and appropriately switching data packets of video, audio, etc., and performing time-division recording into one bit string. At the beginning of each of these packets, there is information called a header for identifying attributes such as video and audio.

The packet length depends on the specifications of the storage medium or transmission network. For example, there is a long one such as an optical disc system, and the upper limit is about 2 in MPEG.
The packet size is 16 (64 Kbytes), and each packet may have a fixed length or a variable length in order to provide flexibility.

Further, as shown in FIG. 8 (2), MPEG
In 2-PS (Program Stream), a pack is placed on the upper part of a packet of video, audio and other data.
There is a hierarchy called a layer, and it is usually handled in a unit called a pack that bundles a plurality of packets.

(Time-Stamp AV Synchronization System) Referring again to FIG. 7, in the decoding device 25,
The decoding process of the individual stream is performed in access unit units. For example, one frame for video and one audio frame for audio are access units. With regard to the MPEG2 synchronization method, information called a time stamp indicating when to decode and reproduce is added to each access unit of video, audio, and other data. S for this time stamp
The time reference is given by information called CR (System Clock Reference). There are two types of time stamps, PTS (playback output time management information) and DTS (decoding time management information).

The multiple bit stream recorded on the storage medium is separated into individual streams by the separating device 23. The video bit stream is stored in an STD (decoder corresponding to the system) buffer (not shown) in the front stage of the video decoder 27, and the audio bit stream is in the front stage of the audio decoder 27 '. In the STD buffer (not shown).
STC (reference synchronization information), which is the time reference on the decoder side, matches SCR (system time reference reference value), and the time reference is given to the time stamp (PTS, DTS).

The separating device 23 and the decoding device 25 will be further described. The separating device 23 separates the multi-bit stream into a video individual stream, an audio individual stream, etc., and the respective STD buffers in the decoding device 25 are separated. (Not shown) are sequentially recorded. Each decoder 2
In 7 and 27 ', a bit stream for one access unit is read from the corresponding STD buffer at a predetermined timing and a decoding process is performed.

For example, the individual bit streams separated by the separating device 23 for video are sequentially accumulated in the STD buffer. The video decoder 27 reads the stored bit stream by one access unit (one frame) at a time, and starts the decoding process of the read bit stream. When the read timing is delayed from the predetermined timing, the STD buffer overflows. If it is too early than the predetermined timing, underflow will occur and the buffer will fail in any case.

Further, in the multi-bit stream, it is necessary to send corresponding audio and the like to the video at an appropriate ratio to establish synchronization. For example, if only the video is sent and the corresponding audio or the like is not sent, the video and the audio cannot be synchronized and cannot be reproduced.

Conventionally, as a coding / multiplexing apparatus for generating a multi-bit stream, a real-time coding / multiplexing apparatus used for a video CD as shown in FIG. 9 is known. The real-time encoding / multiplexing device of FIG. 9 includes an encoding device 1 and a multiplexing device 23, and the encoding device 1 encodes a video source signal by a video encoder 7
And an audio encoder 7'for encoding the audio source signal.

The multiplexer 23 has a video encoder 7 in the front stage.
A buffer memory 29 connected to the audio encoder 7'and a buffer memory 29 'connected to the audio encoder 7', and a multiplexer 31 connected to the buffer memories 29 and 29 'in the subsequent stage. ing.

Regarding the operation of the real-time encoding / multiplexing device shown in FIG. 9, the video source signal is sent to the video encoder 7, and the audio source signal is similarly inputted to the audio encoder 7 '. The video encoder 7 and the audio encoder 7 ′ individually perform compression encoding while maintaining their cooperation. The encoded video bit stream is sequentially stored in the buffer memory 29, and the similarly encoded audio bit stream is stored in the buffer memory 29 '.
Are sequentially accumulated in.

The multiplexing unit 31 includes buffer memories 29 and 2
While analyzing each bit stream accumulated to some extent in 9 ', video packets and audio packets are multiplexed in a predetermined order to generate a multiplexed bit stream in which video and audio are time-division multiplexed. . This multiple bit stream is sent to the separation device by being recorded on an appropriate storage medium or via an appropriate network.

Conventional real-time encoding as shown in FIG.
When a multiplex device is used to generate a multiple bit stream, the following problems occur. Conventionally, only video and audio were multiplexed as individual materials, but as the scope of application expands, all video sources including movie sources, music videos, etc. are targeted. For example,
When you want to add surround for audio or dubbing in several languages corresponding to one video, generate a multi-bit stream containing subtitles in several languages, and record it on a storage medium Occurs.

Even when a large number of individual bit streams are multiplexed in this way, the STD buffer overflows or is overflowed in the demultiplexing / decoding device (not shown) at the subsequent stage after receiving the multiple bit streams. Don't underflow and fail. In addition, it is necessary that audio, subtitles, etc. be combined in a synchronized ratio with the video.

Therefore, when the individual bit streams are multiplexed, the individual bit streams are previously set in the multiplexer.
It is necessary to perform scheduling processing such as proper combination of streams and determination of proper individual bit stream length. The scheduling process currently pre-reads each individual bit stream to be multiplexed in order to determine the size of the portion to be multiplexed (packetized), and accesses the portion before that (the portion where DTS is slow). -By observing the size of the unit, it is only possible to determine the current multiplexing. For the prefetching of this scheduling, the buffer memories 29 and 29 'of the multiplexer 23 need to have a very large capacity. Further, when a large number of elementary streams are multiplexed with the expansion of the applicable range, a huge capacity of buffer memory is required.

[0025]

SUMMARY OF THE INVENTION In order to deal with the problems associated with such multiplexing processing, the present inventors have proposed a method capable of multiplexing without analyzing individual bit streams such as video and audio. investigated. In the multiplexing process, as described above, overflow and underflow of the STD buffer on the decoding device side are avoided, and since the video and audio are combined in synchronization, the scheduling process is required on the multiplexing device side. Therefore, in the multiplexing device, scheduling processing and multi-bit
Considered separating stream generation. In order to perform this scheduling process, the data size of each individual bit stream to be multiplexed is required.

From this point of view, the present applicant initially considered a multiplexer as shown in FIG. FIG. 10 is a diagram showing a portion related to one individual stream (for example, a video bit stream) in the multiplexer. The multiplexer shown in FIG. 10 is an original multiplexer 23.
The multiplexing preprocessing device 3 is provided in the preceding stage. The multiplexing preprocessing device 3 has a first memory 9, a header detector 11, a size calculator 33, and a second memory 35.

The video source signal is input to the video encoder 7. Although not shown in the figure, it also has a voice encoder for encoding a voice source signal and a subtitle encoder for encoding a subtitle source signal.

The video encoder 7 encodes the video source signal according to the MPEG2 standard and produces an encoded bit stream. This coded bit stream is the first
Is stored in the memory 9. This first memory 9 requires a relatively large capacity because the coded bit stream is stored therein. A unique header of several bytes (for example, a picture header for each picture in the case of video) for displaying the characteristic is added to the beginning of the MPEG2 bit stream. The header detector 11 sequentially searches each byte of the bit stream by means of software to detect this header, and outputs a header detection trigger signal to the size calculator 33 each time it is detected. The size calculator 33 calculates the size of the data by reading a count value each time a header detection trigger comes in while rotating a counter in synchronization with the reading speed from the first memory 9 by incorporating an appropriate clock, for example. To do. After this processing is completed, the bit stream is stored in the second memory 35 as it is. This second memory 35 also needs a relatively large capacity because the coded bit stream is stored therein.

Although not shown in the figure, similarly, an audio multiplexing preprocessing device 3'and a subtitle multiplexing preprocessing device 3 "are prepared.

The scheduler 15 of the multiplexer 23
Receives the size of each data from each size calculator for video, audio, subtitles, etc. Perform a scheduling process to determine. The schedule data obtained as a result of the scheduling process is sent to the multi-bit stream generator 17,
The stream generator 17 time-division-multiplexes the individual bit streams obtained from the second memories 35, 35 ', 35 "on the basis of the schedule data to generate a multiplexed bit stream.

However, in the case of the multiplexer as shown in FIG. 10, two relatively large-capacity memories capable of accumulating individual bit streams are required for each individual bit stream of video, audio, subtitles, etc. To do. Also, the header detector requires time to sequentially search each bit stream as it relies on software means for header detection. Further, there is a problem that a size calculator is required after the header detector and the hardware configuration is complicated.

In view of the above problems, the present invention provides a coding / multiplexing device, a multiplexing preprocessing device, and a coding / multiplexing device capable of multiplexing without analyzing individual bit streams such as video and audio. It is an object to provide a multiplexing method.

Furthermore, the present invention reduces the memory capacity required for the multiplexing preprocessing device for reducing the load of the multiplexing process, and is capable of high-speed processing as a whole as an encoding / multiplexing device and a multiplexing preprocessing device. And an encoding / multiplexing method.

[0034]

Encoding according to the present invention
The multiplexing device encodes a plurality of individual source signals including a video source signal, an audio source signal, a caption source signal, etc., respectively, in accordance with a digital encoding standard such as the MPEG standard to generate a multiple bit stream. An encoding / multiplexing device, comprising a plurality of encoding devices that respectively encode the individual source signals, a multiplexing preprocessing device, and a multiplexing device, wherein the multiplexing preprocessing device is First memory means for accumulating the individually encoded bit stream, header detection means for detecting header information from the individually encoded bit stream, and memory address of the first memory corresponding to the detected header information And a second memory means for storing
Multiplexing is performed by scheduling based on the plurality of individual bit streams and the memory address from the second memory means.

Further, in this encoding / multiplexing device,
The header detecting means is composed of hardware means.

Further, the encoding / multiplexing method according to the present invention is capable of transmitting a plurality of individual source signals including, for example, a video source signal, an audio source signal, a caption signal, etc. in accordance with a digital encoding standard such as MPEG. A coding / multiplexing method for respectively coding to generate a multiple bit stream, wherein the coding / multiplexing method includes a step of respectively coding the individual source signals, a step of pre-multiplexing processing, And subjecting the individual coded bit stream to a first
Of the individual coded bit stream, the header information is detected from the individually encoded bit stream, and the detected header information and the corresponding memory address of the first memory are stored in the second memory means, In the step of performing the multiplexing process, scheduling is performed based on the plurality of individual bit streams and the memory address from the second memory means to perform the multiplexing process.

According to this encoding / multiplexing apparatus and the encoding / multiplexing method, the header information and the corresponding data from the multiplexing pre-processing apparatus are not analyzed at the time of multiplexing without analyzing the individual bit stream. The scheduling process can be performed based on the size, and each individual data stream can be time-division multiplexed based on the scheduling result. In addition, the multiplexing preprocessing device has a simpler configuration than the previously examined multiplexing preprocessing device, and the required memory capacity can be reduced as a whole.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the same elements will be denoted by the same reference symbols and redundant description will be omitted.

[Data Structure and Bitstream Stream Structure of MPEG System] First, the data structure of a multiplex bit stream generated by the encoding / multiplexing apparatus of this embodiment will be described.

The data structure of the multiple bit stream of this embodiment conforms to MPEG2-PS (Program Stream), and its data structure and bit stream have a hierarchical structure as follows. Although this MPEG stream has a large number of 1-bit flags and the like, it is a byte stream that is byte-aligned for each unit such as a header, and information indicating the length precedes the data portion that is not fixed length. If you don't need it, you can skip that part.

(MPEG2-PS Data Structure) As shown in FIG. 8, a multi-bit stream (MPEG2-PS) is used.
The data structure of PS) is divided into a lower layer (packet layer) and an upper layer (pack layer).
As shown in FIG. 8 (2), the upper layer (pack layer)
With respect to, one program, sometimes referred to as a sequence, begins with a pack header at the beginning and ends with an end code. A pack is generally composed of multiple packets, and the first pack of the program contains the system
There is an information group (structure similar to a packet) called a header that describes an outline of the entire stream (parameter information). This system header is required to be added to the first pack, but it is an option in the second and subsequent packs.

Lower layer (packet layer) MPEG
Is a PES packet (Peckeized Elementary S
This structure is MPEG2-TS.
The header part is complicated because it is used in common, but it is easy to understand hierarchically.

The 32-bit "packet start code" is
It consists of a 24-bit fixed part and an 8-bit stream ID (identification) part. In MPEG2-PS, the stream ID is defined so that up to 16 channels of video and 32 channels of audio can be used.

The "packet length" following this indicates the data length of the packet following this field.

The 2-bit control code "10" following the packet length is "00", "01" of MPEG1 as described above.
Or, it is used for distinguishing from "11".

In addition, "scramble control flag", "priority flag", "DSM (Digita
Information such as "Storage Media) trick mode", "copy / write", and "CRC (Cyclic Redundancy Check)" can be added, but they are omitted because they are not directly necessary for the description of this embodiment.

[Embodiment 1] FIG. 1 is a diagram showing the overall configuration of a real-time encoding / multiplexing device of the present embodiment. This coding / multiplexing device includes a coding device 1, a multiplexing preprocessing device 3, and a multiplexing device 5. The encoding device 1 has a video encoder 7, an audio encoder 7 ', and a subtitle encoder 7 ", corresponding to each individual source signal. The individual materials are video, audio, and subtitle.
The number of individual source signals is not limited to this, and in MPEG2-PS, for example, up to 32 audio signals can be multiplexed, and multiple subtitle data may be multiplexed for subtitles. Accordingly, the number of coding devices and multiplexing preprocessing devices are increased.

The multiplexing preprocessor 3 corresponds to each individual bit stream, the first memories 9, 9 ', 9 "in which the coded bit stream is written, and this bit stream.
Header detector 11, 1 for detecting header from stream
1 ', 11 "and a second memory 13, 13', 13" in which the memory address of the detected header is written, respectively.

The multiplexing device 5 has a scheduling device 15 and a multiplex bit stream generator 17 for performing a scheduling process.

Of the coding / multiplexing apparatus shown in FIG. 1, the pre-multiplexing apparatus will be described in more detail with reference to FIG. FIG. 2 is a diagram showing a portion of the preprocessing apparatus shown in FIG. The same applies to other audio and subtitle parts.

The multiplexing preprocessing device 3 includes a first memory 9 having a relatively large capacity capable of accumulating a coded bit stream.
And a header detector 11 for reading the coded bit stream from the first memory 9 to detect a header, and a second memory 3 for storing a file of the memory address of the detected header. A multiplexer 5 is provided downstream of the multiplexer preprocessor 3, and the multiplexer 5 includes a scheduling unit 15 and a multiplex bit stream generator 1.
7 and.

The operation of a part of the multiplexer of FIG. 2 will be described. The individual bit stream encoded from the video encoder (not shown) is stored in the first memory 9. The header detector 11 reads the bit stream accumulated in the first memory 9 and, for example, PLD (Progra
mmable Logic Device) to detect the header. PLD is an LSI that can program such header detection logic at hand.
Also called (Programmable Logic Array). By detecting the header, the memory address of the header start position in the first memory 9 is known.

When the CPU is used as the multiplexer 23 of the conventional real-time encoding / multiplexing apparatus (FIG. 9), the CPU must search all individual bit streams one byte at a time for header detection. did not become.
Here, by using the PLD, according to the header detector 11 of the present embodiment, the load on the multiplexer is reduced, and the processing time is greatly shortened as a whole.

The process of detecting the header from the encoded bit stream will be briefly described. FIG. 3 shows the data structure of MPEG2 video data. The data structure is composed of 6 layers including a sequence layer, a GOP layer, a picture layer, a slice layer, a macroblock (MB) layer, and a block layer. Regarding the image type, there are three types of pictures: I picture (intra-frame encoded image), P picture (inter-frame forward predictive encoded image), and B picture (bidirectional predictive encoded image). PSC (Picture Start Code in layer header, start code of picture layer,
00 00 01 00 (H)), PCT (Picture Coding Type, which indicates a picture type).

Regarding the detection of the header from the encoded bit stream of audio, FIG. 4 shows the structure of MPEG audio. Bit of MPEG audio
One frame of the stream is AAU (Audio Access Unit)
). By detecting the sync word in this header, it is determined that the data is audio data.

Further, the processing of the header detector can be processed by software as shown in FIG. Index register i (byte of first memory), j
Zero is stored in (order of header) (S1). Data of 4 bytes is read from the address i of the first memory 9 (S
2). Determine whether EOD (End of Data) (S
3). If EOD, end. If it is not EOD, it is judged whether it is PCT in the case of video data (S4). P
If not CT, jump to step S7. If it is PCT (start code of picture layer), the picture head and i (start memory address) are recorded in the jth record of the “memory address-header corresponding file” (FIG. 6) in the second memory 13. (S5). increment j by +1 (S
6). i is incremented by +1 (S7). Jump to step S2.

FIG. 6 shows a memory address-header correspondence file stored in the second memory 13. here,
For example, memory address # 2 of header A of record 1
By subtracting the memory address # 1 of the header A of the record 0 from, the data size can be known (since the header length is known).

One of the features of the present embodiment is that it is not necessary to store the bit stream itself in the second memory, as long as it has a capacity necessary to store only the memory address-header corresponding file, A small amount of memory is enough. Therefore, as compared with the second memory 35 of the study example shown in FIG. 10, the capacity of the second memory 13 can be very small.

Scheduling unit 15 of multiplexer 5
First, the size of the header and the data is known from the memory address-header correspondence file of the second memory 13 (and the audio memory 13 ', the caption memory 13'). Scheduling processing is performed based on the size of each header of video, audio, and subtitles and the corresponding data. The resulting schedule data is sent to the multi-bit stream generator 17 in the subsequent stage.

The multi-bit stream generator 17 stores the coded bit stream of the first memory 9 for video, the coded bit stream of the first memory 9'for audio, and the first memory 9 "for caption. Time division multiplexing of the coded bit stream is performed based on these schedule data.

The encoding / multiplexing apparatus and the encoding / multiplexing method according to the present invention have been described above. The digital moving image encoding standard used in the present invention is MPE.
It is not limited to G2. As long as the present invention is similarly applicable to new phases defined in the future, they belong to the technical scope of the present invention. The technical scope of the present invention is determined based on the description of the claims.

Whereas the conventional multiplexing is performed while analyzing coded bit streams of video, audio, subtitles, etc., this multiplexing processing is performed without analyzing these individual bit streams. Therefore, the burden of the multiplexing process can be reduced.

Further, this embodiment can reduce the required memory capacity as a whole.

Further, according to this embodiment, it is possible to provide a multiplexing device and a multiplexing method capable of high-speed processing.

[0065]

According to the present invention, there are provided a coding / multiplexing device, a multiplexing preprocessing device, and a coding / multiplexing method capable of multiplexing without analyzing individual bit streams of video, audio and the like. Can be provided.

Further, according to the present invention, the memory capacity required for the pre-multiplexing device for reducing the load of the multiplexing process is reduced, and the coding / multiplexing device capable of high-speed processing as a whole, the pre-multiplexing device. A processing device and an encoding / multiplexing method can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of an encoding / multiplexing device according to an embodiment.

FIG. 2 is a diagram showing a part related to a video signal of the encoding / multiplexing device of FIG. 1, and is a diagram for explaining a configuration / operation of the present embodiment.

FIG. 3 is a diagram illustrating a data structure of MPEG2 video data that is a target of a multiplexing process by the encoding / multiplexing device of FIG. 1.

FIG. 4 is a diagram illustrating a data structure of MPEG2 audio data that is a target of a multiplexing process by the encoding / multiplexing device of FIG. 1.

5 is a diagram showing a flow when the operation of the header detector of the encoding / multiplexing apparatus of FIG. 1 is processed by software.

6 is a diagram showing an example of a memory address-header correspondence file stored in a second memory of the encoding / multiplexing apparatus of FIG.

FIG. 7 is a diagram illustrating a basic system of an MPEG system.

[Fig. 8] Fig. 8 is a diagram for explaining multiplexing by packets of video / audio information and grouping of a plurality of packets by packs.

FIG. 9 is a diagram showing a configuration of a conventional real-time encoding / multiplexing device.

FIG. 10 is a diagram showing a configuration of an encoding / multiplexing device that was initially studied in forming the present invention.

[Explanation of symbols]

1 Encoding device 3 Multiplexing pretreatment device 5 Multiplexer 7,7 ', 7 "encoder 9,9 ', 9 "First memory 11, 11 ', 11 "header detector 13, 13 ', 13 "second memory 15 Scheduling device 17 Multi-bit stream generator

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Claims (7)

(57) [Claims] 1. An encoding / multiplexing apparatus for encoding a plurality of individual source signals including at least a video source signal and an audio source signal according to a digital encoding standard to generate a multiple bit stream, A plurality of coding devices for respectively coding the source signals, a multiplexing pre-processing device, and a multiplexing device, wherein the multiplexing pre-processing device stores first coded bit streams Header detecting means for detecting header information from the individually encoded bit stream, and second memory means for storing the detected header information and the memory address of the first memory corresponding thereto. The multiplexing means schedules based on the plurality of individual bit streams and the memory address from the second memory means. Encoding that performs multiplexing processing
Multiplexer. 2. The coding / multiplexing apparatus according to claim 1, wherein the plurality of individual source signals include a caption source signal. 3. A coding / multiplexing apparatus according to claim 1, wherein the digital coding standard is MPE for video.
Encoding / multiplexing device that is a G2 system and is MPEG audio for audio. 4. The encoding / multiplexing apparatus according to claim 1, wherein the header detecting means is a hardware means. 5. The encoding / multiplexing apparatus according to claim 1, wherein the multiplexing means is based on a difference between respective memory addresses of two adjacent headers stored in the second memory means. An encoding / multiplexing apparatus that performs scheduling by determining the size of data corresponding to. 6. In line with digital video coding standards,
In a multiplexing preprocessing device used in a coding / multiplexing device for respectively coding a plurality of individual source signals including at least a video source signal and an audio source signal to generate a multiplexed bit stream, an individually coded bit stream A first memory means for storing the header information, a header detecting means for detecting header information from the individual coded bit stream, and a second memory for storing the memory address of the first memory corresponding to the detected header information.
Of the first memory means and the memory address of the second memory means are sent to a multiplexer in the subsequent stage. 7. In line with digital video coding standards,
In a coding / multiplexing method for respectively coding a plurality of individual source signals including at least a video source signal and an audio source signal to generate a multiple bit stream,
The encoding / multiplexing method includes a step of encoding the individual source signals, a step of performing a pre-multiplexing process, and a step of performing a multiplex process. An encoded bit stream is stored in a first memory means, header information is detected from the individually encoded bit stream, and the detected header information and the corresponding memory address of the first memory are stored in the second memory. The encoding / multiplexing method, wherein the step of accumulating in the means and carrying out the multiplexing processing carries out the multiplexing processing by scheduling based on the memory addresses from the plurality of individual bit streams and the second memory means.