JP2000278233A - Broadcast system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the transmission efficiency of a broadcast system and then to shorten the reception time of attached information. SOLUTION: A program producing device 104 combines program object data received from an object input device 102 to produce program management data including at least a use start time and a use end time of each of program object data and scene description data denoting temporal and spatial layout of each of the program object data and stores them to a program storage device 103. A program transmitter 105 reads program configuration data sequentially from the program storage device 103 at a predetermined broadcast time, an encoder group 106 compresses the data, a multiplexer 107 multiplexes the compressed data to obtain data of one program and a transmitter 108 transmits the data as a broadcast signal. A re-transmission data management device provided to the multiplexer 107 repetitively multiplexes received program configuration data within a permissible time and selects and multiplexes only program object data required at present in the case of re-transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a broadcasting system, and in particular, a broadcasting program transmitting system for creating and transmitting a program by multiplexing program material data, and receiving a data broadcasting program created and transmitted by the system. To a broadcast program receiving apparatus.

[0002]

2. Description of the Related Art In a conventional broadcasting system, in addition to main broadcast data such as audio and moving images, additional information such as still images and text and control data for controlling the additional information are multiplexed into the main broadcast and received. By displaying the additional information in accordance with the control data, services such as displaying text and still images in synchronization with the main broadcast or providing interaction are provided. Further, by repeatedly transmitting the additional information and the control data, a user who has viewed the program in the middle (hereinafter, referred to as a participant in the middle) can receive the service.

However, in a conventional broadcasting system,
After receiving all the additional information and control data used in the program on the terminal side, it is a storage type system that can provide services for the first time, so the service can be received until all these additional information and control data are received and stored. There was no restriction. Therefore, additional information used only in a part of the program is repeatedly transmitted during the continuation of the program, and control data used only in a part of the program is also repeated during the continuation of the program, such as for initializing the program. Etc.
There is a problem that the transmission band is not used effectively.
Because of this limitation, it was difficult for a program creator to create a program using a large amount of additional information.

[0004]

As described above, in the conventional broadcasting system, the service is only possible after receiving all the additional information and control data used in the program on the terminal side. There is a problem that the transmission efficiency is low and that the additional information and control data used only in a part of the program are repeatedly transmitted, resulting in low transmission efficiency.

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a broadcast system capable of efficiently using a transmission band, and also provides a broadcast program transmission system and a broadcast program receiving apparatus suitable for use in this system. The purpose is to:

[0006]

A digital broadcast program transmission system used in a broadcast system according to the present invention to solve the above problems has the following characteristic configuration.

(1) Combining a program material input device for taking in program material data used in a broadcast program and program material data taken in by the program material input device, at least the use start time and end time of each program material data And a program creation device for creating scene description data indicating the temporal and spatial arrangement of each piece of program material data, and the program material data and the program creation device captured by the program material input device. A program storage device for storing the created program management data and scene description data; and sequentially reading and transmitting the program management data, scene description data, and program material data from the program storage device in accordance with a predetermined broadcast time. Program transmission device, and program management data, scene description data, and program material data transmitted from the program transmission device. And encoders for compressing each program management data compressed by the encoder group, a multiplexing device according to one of the program data scene description data, the program material data are multiplexed, to the multiplexer,
The input program management data, scene description data, and program material data are repeatedly multiplexed within an allowable time, and at the time of retransmission, currently necessary program material data is selected based on the program management data and scene description data, and multiplexing is performed. And a transmission device for broadcasting program data output from the multiplexing device.

As described above, at the time of multiplexing each program material, by multiplexing only the currently necessary program material, it is possible to improve the transmission efficiency and, consequently, to shorten the additional information receiving time.

(2) In the configuration of (1), there is further provided a scene description dividing device for dividing the scene description data created by the program creating device into predetermined units and outputting the divided units to the corresponding encoders of the encoder group. It is characterized by the following.

As a result, it is not necessary to transmit scene descriptions all at once, and the waiting time for starting a program can be reduced.

(3) In the configuration of (2), the history of the multiplexed divided scene description data is further stored in the multiplexing device, and
A scene description management device that compresses the size of the divided scene description data by deleting commands older than the current time with commands having the same material and the same attribute, and unit scene description data compressed by the scene description management device; Are sequentially multiplexed together with other data by the multiplexing device.

[0012] This makes it possible to reduce the data size when the scene description is repeatedly transmitted, thereby improving the transmission efficiency, that is, shortening the reception time of the additional information control code.

(4) In the configuration of (2), further, at least one of the divided scene description data and the use start time information of each program material data, the encoded data size, and the entire data bandwidth is supplied to the multiplexer. And a scheduling device for determining an order of multiplexing based on the above.

This makes it possible to transmit and receive scene descriptions and data materials by the time required for the program configuration.

(5) In the configuration of (4), the scheduler first uses the transmission bandwidth of the entire program for part or all of the scene description data and each program material data to the multiplexer. The main broadcast and the additional broadcast are multiplexed in a predetermined transmission bandwidth.

[0016] Thus, the scene description before the main broadcast starts,
It is possible to postpone the data material at high speed.

On the other hand, the digital broadcast program receiving apparatus used in the digital broadcast system according to the present invention has the following characteristic configuration.

(6) Program material data used in a broadcast program, program management data including at least the use start time and end time of each program material data, and a scene description indicating the temporal and spatial arrangement of each program material data A digital broadcast program receiving apparatus that compresses and multiplexes data with a predetermined broadcast time, selectively receives and demodulates a plurality of broadcast signals broadcast as one program data, and reproduces a broadcast program. Data separating means for separating program material data, program management data, and scene description data multiplexed in a program from the received and demodulated one program data; and program material data separated by the data separating means. , Program management data, a decoder group for decompressing the scene description data, and each program based on the scene description data output from the decoder group. A scene description processing device for determining a combination of material data; and a reproduction processing device for combining and reproducing the image material data decompressed by the decoder group in accordance with an instruction of the scene description processing device. Is characterized by comprising a scene description execution determining unit that determines whether or not to process a scene description based on time information of a processed scene description and a newly received scene description.

This makes it possible to properly process the retransmitted scene description even when participating in the middle.

In the present invention, MPEG4 (Moving Picture Ex
Object processing by perts Group phase 4) is available. That is, in MPEG4, it is possible to manage the transmission start time, the end time, and the like for each object. By devising the scene description format, the scene description can be divided and compressed.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) First, a "mechanism for encoding and decoding for each program material and displaying a program" of a broadcast system according to the present invention will be described.

FIGS. 1 and 2 show the overall basic configuration of a broadcasting system according to the present invention. That is, this system includes a digital broadcast program transmission system 101 (FIG. 1) for creating and broadcasting a program, and a digital broadcast program receiving apparatus 201 (FIG. 2) installed in each home or the like and having a function of receiving a digital broadcast program. .

The digital broadcast program transmission system 101
, The program material used in the program is captured by a plurality of or a plurality of types of material input devices 102. The material input device 102 varies depending on the type of program material. For example, a video camera is used for moving images, a scanner is used for still images, a microphone is used for audio, and a PC is used for text.
(Personal computer). Further, the number of the material input devices 102 is not limited. All the fetched program materials are digitized and stored in the program storage device 103.

The program creation device 104 includes the program storage device 10
3 is read, and the spatial and temporal arrangement of each data material (characters, still images, etc.) (display time, display interval, vertical relationship between materials, size, position, etc.) and programs The program is edited by determining the overall transmission bandwidth, video, audio, data bandwidth, and the like. Here, the main broadcast may be various, such as only audio, audio and video, only video, or neither audio nor video.

In this way, in addition to the moving picture, audio, and data materials, scene description data indicating spatial and temporal arrangements,
And transmission bandwidth for the entire program, transmission bandwidth for the entire data material, use start time and end time of each data material, etc.
Program data for composing a program is generated and stored in the program storage device 103 collectively.

The program transmitting device 105 reads out program data from the program storage device 103 in accordance with the broadcast schedule, sequentially reads out the respective materials stored in advance in the program storage device 103 according to the program data, and transfers them to the encoder 106.

The encoder 106 is activated in accordance with the type of data, for example, moving image, audio, various data, scene description data, etc., and sequentially performs encoding processing. The transmission bandwidth at the time of encoding uses that described in the program data. The number of activated encoders depends on the number of data included in the transmitted program data.

The encoded main broadcast data (moving picture, audio, etc.) and data broadcast data (text, still picture, scene description, etc.) are output to the multiplexer 107. The multiplexing device 107 converts the data material and the scene description data selected by the retransmission data management means 107a based on the start time, end time, and data transmission bandwidth of each data material described in the program data into the main broadcast. Multiplex sequentially with data.
At this time, each data material and scene description data are repeatedly multiplexed for the participant on the way.

The multiplexed data is added with a synchronization code, an error correction code, and the like by the transmission device 108, decomposed into a plurality of packets, and then transmitted as digital broadcast. Data transmission paths include communication satellites, terrestrial waves, CATV,
There are satellite broadcasting, telephone lines and the Internet.

The data transmitted from the digital broadcast program transmission system 101 is received by the digital broadcast program receiver 201 shown in FIG. 2 through the reception circuit 202 and demodulated for each packet. The data packets demodulated by the receiving circuit 202 are separated for each program material, and then sent to the decoder 203.

The decoder 203 is activated in accordance with the type of data, for example, a moving image, a sound, a still image, a character, a scene description, etc., and sequentially performs a decoding process. The number of activated decoders depends on the number of program materials being received at that time. The decoded scene description data is sent to the scene description processing device 204. The scene description processing device 204 instructs the image processing circuit 205 and the audio processing circuit 207 to reproduce each received program material according to the scene description. The image processing device 206 performs a drawing reproduction process so that the designated program material is displayed in the designated position and in a vertical relationship according to the instruction of the scene description processing device 204, and displays the same on the screen of the CRT 206. Similarly, the audio processing device 207 performs audio reproduction processing and outputs sound from the speaker 208 according to the instruction of the scene description device 204.

A feature of the present embodiment in the digital broadcasting system having the above configuration is that the multiplexing apparatus 107 shown in FIG. 1 employs a retransmission data management means 107a for selecting only the currently necessary material from the program material data. The point is that only the selected material is multiplexed. in this way,
By providing the multiplexing device 107 with the retransmission data management means 107a for selecting only the currently necessary material, the transmission efficiency can be improved, that is, the additional information reception time can be reduced without multiplexing unnecessary data. It becomes possible.

An example will be described with reference to a program as shown in FIGS. 3 (a) and 3 (b). This program example includes a Japanese weather corner shown in FIG. 3 (a) in the first half of the program, and FIG.
It is an example of the weather program comprised from the weather corner of the world shown by (b). In the first half of the Japanese weather section, the announcer's voice and video, the text "Japanese weather",
A map of Japan and still images representing “sunny”, “cloudy” and “rain” are displayed. In the world weather section, voices and moving pictures of an announcer, text "world weather", a world map and still images representing "sunny", "cloudy", and "rain" are displayed.

The production process of this program is as follows. First, various materials in a program are captured using the material input device 102. In this example, as shown in FIG. 3C, the announcer audio data 301 and the announcer video data 30
2. Text 303 of "Weather in Japan", still image data 304 for Japan map, and still image data 30 for "sunny"
5. Still image data 306 for "cloudy", still image data 307 for "rain", text 308 "weather in the world", and still image data 309 for world map are taken in. These program materials are stored in the program storage device 103 with a resource ID for identifying the materials added.

The program creating device 104 fetches these program materials 301 to 309 and creates scene description data and program data. In this case, the time from the start to the end of the program is defined as the absolute time, and the spatial and temporal information of each program component is set. For example, the components in FIGS. 3A and 3B include a text at the upper left, a still image in the background, “sunny” displayed above Hokkaido, “sunny” displayed above Kanto, and Shikoku. There is a still image representing "cloudy" displayed on the top, a "rain" displayed on Kyushu, a moving image of the world map, and a main broadcast announcer. The scene description is composed of a scene description command including a relative time in a program, a component number (hereinafter, data ID), and attribute designation of the component, and is arranged in time order. The attributes of the constituent elements are a data type, a display position, a resource ID, and a display attribute.

The data type is text or still image. The display position is an X position, a Y position, which indicates a relative position from the upper left of the screen, and a Z position, which indicates a depth direction. The resource ID is
This is a number indicating the data to be actually displayed. The display attribute indicates display or non-display. By distinguishing the data ID and the resource ID, the same program material can be referred to from a plurality of data IDs.

The program data includes a program start time, a program end time, a resource table indicating program materials used in the program, and multiplex parameters used in multiplexing.
The resource table includes a resource ID, use start time, end time, data type, and comment for each program material.
The multiplexing parameters are the bit rate of the entire program, the bit rate of the moving image of the main broadcast, the bit rate of the audio, and the bit rate of the data broadcast.

FIG. 4 shows an example of program data for FIGS. 3 (a) and 3 (b). In this example, the program is from 12:00 to 12:02, and the program material whose resource ID is 0 is a text "Japanese weather", which indicates that it is used from 1 second to 60 seconds after the start of the program. . The same applies to other resource IDs. Here, the resource ID 9999 is a number reserved for scene description. Also, the entire program, videos,
The audio bit rates are 24Kbps and 20K, respectively.
bps, 3.2 Kbps, and the bit rate for program material and scene description is 800 bps.

FIG. 5 shows an example of a scene description for FIGS. 3A and 3B. The program component of data ID 10 is time 1
In second, X position 0, Y position 0, Z position 1, resource ID 0
The text "Japanese weather" is displayed, and X
Move to position 10, Y position 5, and at time 5 seconds X position 20,
It indicates that it moves to the Y position 10. Further, at 5 seconds, it is indicated that the program component of the data ID 11 displays a still image of “Japan map” of the resource ID 1. The same applies hereinafter.
Note that comments after "//" are comments.

The multiplexing process of the program created in this way is as follows. The retransmission data management means 107a
Based on the start time and end time of each data stored in the program data and the time currently being transmitted from the multiplexing device 107, only the currently used data is selected and multiplexed, so that the transmission bandwidth is reduced. Improve usage efficiency.

FIGS. 6 and 7 show a specific processing flow.
As shown in FIG. 6, the multiplexing device 107 reads a program data file from the program storage device 103 (S60).
1) Acquire the resource data table, acquire the start time and end time of each material data, and acquire the bandwidth of the entire data (S602), set the current time (curTime) to 0 (S603), and Is determined to be greater than the program end time (S604). Here, if the current time is greater than the program end time, the multiplexing process ends.

If the current time is smaller than the end time of the program in step S604, it is determined whether or not the data should be multiplexed, but it is a data broadcast (S605). If not, the main broadcast is multiplexed (S606). ), Step S604
Return to the processing of. If it is a data broadcast, the retransmission data management means 107a is called to select data to be multiplexed (S607), and the current data (curData) is NULL.
(None) (S608), and NULL
Otherwise, the encoder result corresponding to this data (curData) is multiplexed (S608), and the current time is updated from the bandwidth of the entire data and the size of the encoded data (curTime + = curData size / data transmission bandwidth). Update: Here, + = means a + = b → a = a + b.
Same. ) (S610), and returns to step S604. If the current data is NULL in S608, it is considered that there is no data to be multiplexed, and dummy data of a predetermined size is multiplexed (S611), and the current time is updated (curTime + = size of dummy data / data). The transmission bandwidth is updated) (S612), and the process returns to step S604.

The retransmission data management means 107a returns currently valid data based on the start time and end time of each resource described in the resource table read by the multiplexer 107 and the current time of the call time argument.

In FIG. 7, first, the current data is NU
LL is checked (S701), and if NULL, the first item is obtained from the material data table and set to the current data (curData) (S702), and step S7 is performed.
If it is not NULL in 01, the next item of the current data is taken out from the resource data table and set to the current data (curData) (S703), and it is determined whether all the resource tables have been checked (S704).

If all are checked in step S704, it is considered that the data to be multiplexed next cannot be found, and NULL is set to the current data (curData) (S706), and the processing is terminated. If there is an unchecked item in step S704, it is checked whether the current time (curTime) is included in the range between the start time and end time of the current data (curData) (S705), and step S7 is performed.
If it is valid in 05, the process ends. If it is not valid in step S705, the next item is extracted from the resource data table and set in the current data (curData) (S70).
7), and return to step S704. Note that, here, the item next to the last element of the resource data table indicates the first item.

Considering the programs shown in FIGS. 3A and 3B, the order of the multiplexed data is, for example, "scene description", "weather in Japan" text, "map of Japan" After repeating the image, "sunny" still image, "cloudy" still image and "rain" still image, "scene description", "world weather"
The text, the “world map” still image, the “sunny” still image, the “cloudy” still image, and the “rain” still image are repeated.

On the other hand, in the conventional method of repeatedly multiplexing all data used in data broadcasting, “scene description”, “Japanese weather” text, “Japan map” still image, “sunny” still image, This is a repetition of a “cloud” still image, a “rain” still image, a “world weather” text, and a “world map” still image. Comparing this with the method according to the invention, the method of the invention is not used when broadcasting the weather in Japan, "World Weather" text, "World Map" still images, and not used when broadcasting the world weather There is no need to multiplex the text "Japanese weather" and "Japan map", and the transmission efficiency can be improved accordingly.

(Second Embodiment) In the system according to the first embodiment, the scene description is processed as one block like other data materials. In the present embodiment, the scene description is Consider dividing and processing. Further, a schedule is set so that the divided scene description and each data are received by a time (start time) required in the program, and a scene description and each data necessary for the participant on the way are set. Consider resending.

FIG. 8 shows the configuration of the digital broadcast program transmission system 101 according to the present embodiment. The mechanism for producing and transmitting a program is basically the same as that shown in FIG. 1 described in the first embodiment. The system is the same. Therefore, FIG.
, The same parts as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 8, the difference from the system of FIG. 1 is that a scene description dividing device 110 for dividing a scene description into predetermined units is provided, and a multiplexing device (here, code 111) is used as a scheduling means 111a. Multiplexing means 111b, scene description management means 111c, and retransmission data management means 111d.

That is, in this system, the multiplexing device 111 manages the multiplexed and transmitted scene description of the multiplexing means 111b, and when retransmitting the scene description for a participant on the way, the multiplexing device 111 duplicates the scene description. And a scene description management means 111c for compressing the scene description data by deleting the scene description data. This makes it unnecessary to transmit and receive the scene description all at once, further reduces the data size when the scene description is repeatedly transmitted, and improves the transmission efficiency, that is, the reception time of the additional information control code. Becomes possible.

In this system, the multiplexing device 11
1 determines the order of multiplexing by the multiplexing unit 111b based on the scene description divided by the scene description dividing device 110, use start time information of each program material, encoded data size, overall data bandwidth, and the like. It is characterized by having a schedule device 111a that performs the scheduling. This makes it possible to transmit and receive the scene description and the data material by the time required for the program configuration.

Further, in this system, the multiplexer 1
11 multiplexes the divided scene description and each data material scheduled to be transmitted before the start of the program using the transmission bandwidth of the entire program, and then multiplexes the main broadcast and the data broadcast with a predetermined transmission bandwidth. Multiplexing means 111b. This makes it possible to postpone the scene description and data material before starting the main broadcast.

Incidentally, the retransmission data management means 111d is provided in FIG.
Has the same function as 107a shown in FIG.

As an example, consider a program as shown in FIGS. 3 (a) and 3 (b).

The scene description dividing device 110 divides the scene description stored in the program storage device 103 into predetermined units, and for each of the divided partial scene descriptions, the serial number and the first scene included in the divided scene description. Based on the description start time and the divided scene description data itself, a divided scene description table including a data size set at the time of encoding later and encoded data is created.

FIG. 9 shows a specific processing flow. First,
The command is read for each scene description command from the scene description file stored in the program storage device 103 (S901), and the process ends if no command can be obtained (S902). If acquired in step S902, a new field is created in the divided scene description table including the divided scene serial number, start time, and divided scene description data (S903), and the serial number is updated and a new command time is generated. (S904), and adds a command to the scene description data of the new field (S90).
5).

Next, the next command is obtained from the scene description file (S906), and if it cannot be obtained, the process is terminated (S907). If it can be obtained in step S907, the start time of this field is added with a predetermined unit of one second, and the time of the command is compared (S908). If the time of the command is smaller, the process returns to step S905; For example, the process returns to step S903 to create the next field.

FIG. 10 shows an example in which the scene description of FIG. 5 is divided. The scene description encoder 106 inputs the divided scene description table, encodes the divided scene data, adds the encoding result to the divided scene table,
Output to the next schedule means 110a.

The schedule unit 111a first obtains program data from the program storage device 103, further obtains encoded data and data size from each encoder 106 except for the scene description encoder, and obtains a resource ID, resource start time,
Create an encoded data table consisting of end time, encoded data size, and encoded data. Next, the output of the scene description encoder 106 is sequentially extracted from the last field of the divided scene description table, and scheduling is performed so that the divided scene description is multiplexed by its start time. Subsequently, scheduling is performed so that the encoded data is multiplexed by the start time by sequentially taking out from the last element of the encoded data table created earlier.

FIG. 11 shows a specific processing flow. First, a divided scene description table is obtained from the scene description encoder 106 (S1101). Next, program data is acquired from the program storage device 103, and encoded data and data size are acquired from each of the encoders 106 other than the scene description encoder to create an encoded data table (S1102). Further, a resource ID-1 indicating unassigned in a scheduled data table including a resource ID, a start time, a data size, a transmission start time, and a transmission end time, 0 as a start time, and (data end time-program start time) as a data size. ) * The table is initialized by setting the data bit rate / 8, the transmission start time to 0, and the transmission end time to the program end time (S1103).

Next, in order to schedule the divided scene description, first, one field is obtained from the end of the encoded divided scene description table (S1104), and if it is obtained in step S1104 (S1105), the scheduling of this field is performed as shown in FIG. (S1106), and returns to step S1104.

If the data cannot be obtained in step S1105, the processing of the divided scene table ends, and the processing shifts to the processing of the encoded data table. That is, one field is obtained from the encoded data table (S110).
7), if it can be obtained in step S1107 (S110)
8), scheduling of this field is performed according to FIG. 12 (S1109), and the process returns to step S1107.
If it cannot be obtained in step S1108, the process ends.

In FIG. 12, first, an unassigned field with a resource ID of −1 is obtained from the end of the scheduled data table (S1201). If the field cannot be obtained (S1202), the resource of the data currently being processed is obtained. A new field consisting of ID, start time, data size, transmission start time of the first field of the scheduled data table−data size / data bit rate * 8, and transmission start time of the first field of the scheduled data table is a scheduled data. Insert at the top of the table (S1203), step S1
If it can be obtained in step 202, it is checked whether the data start time is equal to or longer than the transmission end time (S1204), and step S1204 is executed.
If it is not “more than” in step 1204, the process shifts to step S1215.

In the case of YES in step S1204, it is checked whether the data start time and the field transmission end time are equal (S1205), and if they are equal in step S1205,
The data size of the field is compared with the data size of the data (S1206). If the data size of the field is larger in step S1206, the data size of the data is subtracted from the data size of the field, and further, from the transmission end time of the field (data Is updated by the data size / data bit rate * 8) (S1207), a new field is added after the current field (S1208), and the resource ID, start time, data size, Sending start time,
By setting the resource ID of the data, the start time, the data size, the transmission end time of the field, and the transmission end time of the field + (data size of data / data bit rate * 8) for the transmission end time, respectively, Update is performed (S1209), and the process ends.

If NO in step S1206, the field is updated by setting the resource ID and start time of the data to the resource ID, start time, transmission start time, and transmission end time of the field, respectively (S1210).
The data size is updated by reducing the data size of the data by the data size of the field (S121).
1) It is checked whether there is any data that has not been scheduled yet by checking whether the data size of the data is larger than 0 (S121).
4) If the value is not larger than 0, the process ends. If the value is larger than 0, the next field of resource ID = −1 is obtained from the scheduled data table (S1215), and the process returns to step S1202.

If NO in step 1205, first, a new field is added after the current field, and the resource ID, data size, transmission start time, and transmission end time of the new field are set to −1, (the transmission end time of the field— The new field is updated by setting (data start time) / data bit rate * 8, data start time, and field transmission end time (S1212), and the data size of the field and the transmission end time are set to (data The start time of the field−the start time of the transmission of the field) / the data bit rate * 8 and the start time of the data are set to update the field (S1213), and step S1
Move to 206.

The schedule operation will be described using the divided scene description of FIG. 10 as an example. First, a new field is created in the scheduled data table, and the resource ID, data size, transmission start time, and transmission end time are respectively -1,
Initialization is performed by setting (program end time-program start time) / data bit rate * 8, program start time, and program end time (S1103). Next, one field is acquired from the back of the divided scene description. In this case, “9 120 100 omitted” is obtained. Next, the field whose resource ID is -1 is obtained from the end of the scheduled data table.

In this case, “−1−1200 0 120” is obtained. Since the start time of the data is 120 and the transmission end time of the field is 120, step S1206
Proceed to. Since the data size of the field is 12000 and the data size of the data is 100, step S1
Proceeding to 207, the field is updated (S120).
7). Specifically, the data size of the field and the transmission end time are respectively 12000-100 = 11000,
120- (100/800 * 8) = 119 is set.

Next, a new field is added after the current field (S1208), and the resource ID, start time, data size, transmission start time, and transmission end time of the new field are 9999, 120, 100, and 11 respectively.
The new field is updated by setting 9, 119+ (100/800 * 8) = 120 (S1209),
finish.

The next field “880100 omitted” in the divided scene is processed in step S1201 because the field “−1−110000 119” is acquired, and the data start time 80 and the field transmission end time 119 are obtained. Step S12
Proceed to 12. In step S1212, a new field is added after the current field, and the resource ID, data size, transmission start time, and transmission end time of the new field are -1, (119-80) / 800 * 8 = 3.
The new field is updated by setting 900, 80, and 119 (S1212), and the data size of the field and the transmission end time are (80-0) / 800 *, respectively.
By setting 8 = 0 and 80, the field is updated (S1213), and the process proceeds to step S1206. Step S1206 and subsequent steps are the same.

FIG. 13 shows an example of an encoded data table. FIG. 14 shows an example of a scheduled data table obtained by scheduling a divided scene description in this manner. FIG. 15 shows the divided scene description and all resources. 5 shows an example of a scheduled data table as a result of scheduling.

Subsequently, the multiplexing means 111b multiplexes the scheduled data table and the encoded data table scheduled by the scheduling means 111a and the encoding result of the moving image and audio as the main broadcast. At this time, the multiplexing means 111b multiplexes a part or all of the data for the data broadcast using the bit rate of the entire program before the data for the main broadcast, and thereafter, multiplexes the data with a predetermined transmission bandwidth. Multiplexes broadcast and data broadcast. Thereby, a part of the data for data broadcasting can be transmitted and received at high speed, and the program can be started quickly.

FIG. 16 shows the flow of multiplexing. First, various bit rates are obtained from the program data file (S16).
01), and sequentially obtain fields from the scheduled data table (S1602), and step S1603.
If the transmission start time is negative, it is checked whether the transmission start time is negative (S1604). If the transmission start time is negative, the data is determined to be advance data and the encoded data of the resource ID is multiplexed by the data size (S1605) to prepare for data retransmission. The retransmission data registration process shown in FIG. 18 is performed (S1606).
It returns to 1602. Steps S1601 to S1606 are data advance processing.

If the field cannot be obtained in step S1603, or if the start time is not negative in step S1604, the flow shifts to step S1607 to multiplex the data for the main broadcast and the data broadcast.

In step S1607, the field acquired in step S1602 is set in the currently multiplexed data, the currently retransmitted data is cleared, the currently retransmitted data ID is set to -1, and the current time is set to 0. To perform initialization processing. Next, the current time is compared with the program end time (S
1608), if the current time is greater in step S1608, the process ends. Otherwise, the next data to be multiplexed is selected from the main broadcast data size, data broadcast data size, main broadcast bit rate, and data packaging bit rate that have been multiplexed so far (S160).
9) If the main broadcast data is to be multiplexed, the main broadcast data is multiplexed (S1612). If the data broadcast data is to be multiplexed, the data multiplexing process shown in FIG. 16 is performed (S161).
0), the current time is updated from the multiplexed data size and bit rate (S1611), and the process returns to step S1608.

In the data multiplexing process, fields are sequentially taken out from the scheduled data table, and if assigned, the assigned resources are multiplexed by a certain amount. If not assigned, resources or scene descriptions are appropriately selected and multiplexed by a fixed amount as retransmission.

FIG. 17 shows a specific processing flow. First, it is checked whether the data size of the currently multiplexed data is greater than 0 (S1701). If not, data to be newly multiplexed is acquired from the scheduled data table and is set as the currently multiplexed data (S1702). It moves to step S1703. If it is larger, it means that there is still data to be multiplexed, and the resource ID of the currently multiplexed data is checked (S1703). If the resource ID is not -1, the data is already allocated, so The data for the bit rate (100 bytes in this example) is read and multiplexed (S1704), and the size of the currently multiplexed data is reduced by 100 (S1705).
(S1706), and terminates.

In step S1703, the resource ID is -1.
In the case of, retransmission processing is performed because it has not been allocated. Step S
At 1607, it is checked whether the data size currently being retransmitted is 0,
If the size is larger than 0, since there is data to be retransmitted, 100 bytes are read from the data currently being retransmitted and multiplexed (S1708), the data size of the data currently being retransmitted is reduced by 100 (S1709), and further multiplexing is being performed. 100 is also subtracted from the data size of the data (S1710),
finish.

In step S1707, the data size is 0
If not larger, the data to be retransmitted is newly selected and retransmitted. That is, the retransmission data acquisition process shown in FIG. 21 is performed (S1211), the acquisition result is set to the data currently being retransmitted (S1712), and step S1713 is performed.
If the data size currently being retransmitted is larger than 0, retransmission data is found, and the flow shifts to step S1708. If not found, the dummy data is multiplexed by 100 bytes (S1714), and the process moves to step S1710.

FIG. 18 shows the flow of the retransmission data registration process. First, it is determined whether the retransmission data is a scene description (S1801). If the data is a scene description, it is registered in the scene description management unit 111c shown in FIG. 19 (S1802).
If the data is resource data, it is registered in the retransmission data management unit 111d shown in FIG. 20 (S1803), and the processing ends.

As shown in FIG. 19, the data registration process in the scene description management means 111c simply adds scene description data to the scene description table in the scene description management means 111c. The data registration process in the retransmission data management unit 111d simply adds data to the resource table in the retransmission data management unit 111d, as shown in FIG.

FIG. 21 shows the flow of the retransmission data acquisition process. First, it is checked whether the data ID currently being retransmitted is -1 (S2101). If it is -1, the next data ID is obtained from the registered scene description (S2102), and it is obtained in step S2103. , The data I currently being retransmitted
D is set to the acquired data ID (S2104), and the scene description of this data ID is stored in the scene description management unit 111.
c, and if there is a command with the same attribute, the command whose command time is older than the current time is deleted from the scene description, leaving only the latest scene description command (S2105). All scene description commands of the ID are extracted, encoded, and the result is copied to the data currently being retransmitted (S2106), the encoded data size is set to the data size currently being retransmitted (S2107), and the process ends.

If the next data ID cannot be obtained in step S2103, the process ends. If the data ID currently being retransmitted is not −1 in step S2101,
If there is data being retransmitted, the resource ID currently being retransmitted
Is determined to be 9999 (S2108). If it is not 9999, it is considered that both the scene description and the resource data of the corresponding data ID have completed retransmission processing, and the data retransmission processing of the next data ID is performed. S21
02).

In step S2108, the data ID is 999.
If it is 9, it is considered that the retransmission of the scene description portion of the data ID has been completed, and the resource data itself is retransmitted.
That is, the latest resource ID designation command included in the scene description of the data ID currently being retransmitted is searched to acquire the resource ID value (S2109), and step S211 is performed.
If it cannot be obtained at 0, the process ends. If acquired, the start time and end time of the resource ID are compared with the current time to check whether the resource ID is still valid (S211).
1) If not valid, end. If it is valid, the data of the resource ID is obtained from the resource data stored in the retransmission data management unit 111d (S2112), and the obtained data is set to the data currently being retransmitted (S211).
3), end.

A specific operation example of the multiplexing process will be described based on the scheduled data table shown in FIG.

At step S1602 in FIG. 16, the first field "0 10 2-1 -1 // weather in Japan" is extracted from the schedule data table. Since the transmission start time is -2, it is regarded as advanced data, data is multiplexed, and
Since D is not 9999, the retransmission data management unit 111
Data is registered in d according to FIG. Returning to step S1602 in FIG. 16, similar processing is continued.

In the processing of the third field “9999 1 100 0 1 // scene description” in FIG. 15 of the scheduled data table, the sending start time is not negative, so that step S
The flow shifts to 1607, where the third field is set in the currently multiplexed data. If it is determined in step S1609 that data broadcast data should be multiplexed instead of main broadcast data, the flow shifts to the data multiplexing process in FIG. FIG.
Now, if the currently multiplexed data size is 100 and the resource I
Since D is 9999, multiplexing is performed according to step S1704 and subsequent steps, and the size of the currently multiplexed data is reduced by 100. When the data multiplexing process is called again in step 1610 in FIG. 16, the size of the currently multiplexed data is 0 in FIG. 17. Therefore, in step S1702, the fourth field “1 5 100 1 2 / / Part of map ”is read, set to the currently multiplexed data, and the same processing is performed. In the state where the processing has been completed up to the seventh data of the scheduled data table,
FIG. 2 shows an example of management information in the scene description management unit 111c.
It is shown in FIG.

As a specific example of retransmission, an operation when the seventh field “−1−400 59” of the scheduled data table in FIG. 15 is read in step S1702 in FIG. FIG. 17 step 170
Since the resource ID is equal to −1 in step S9, step S1
The process moves to 708. Since the retransmission process is performed for the first time, the size of the currently multiplexed data is 0, and the process proceeds to step S171.
In the retransmission data acquisition process of No. 2, the retransmission data acquisition process of FIG. 21 is performed. Since the data ID currently being retransmitted is -1, the first data ID 10 in the scene description is acquired as the next data ID (S2102), and is set as the data ID currently being retransmitted (S2104).

The scene description registered in the current scene description management means 111c is as shown in FIG.
If there is a command having the same attribute name for the scene description command of data ID 10 according to step S2105, the command older than the current time is deleted. For example, regarding the X position attribute, since there are commands at times 1, 3, and 5, the commands at times 1 and 3 are deleted. Step S21
When all commands of data ID 10 are acquired again at 06, the scene description shown in FIG. 23 is obtained, and the data size of the scene description command can be reduced.

FIG. 24 shows, in the form of a scheduled data table, the first part of the transmission status of data broadcast data including retransmission data. Here, the portion shown in italics is retransmission data, and indicates that retransmission is being performed in accordance with the transmitted resource.

In the above description, X, Y, and Z positions, resource IDs, and data types are given as examples of attributes in the scene description. However, other attributes such as character size, character font, and character modification can be applied. It is. Also, in the multiplexing, an example has been shown in which multiplexing is performed 100 bytes at a time once per second, but the present invention is not particularly limited to this.

By the above processing, it is possible to provide a digital broadcast program transmission system which divides control data and transmits only necessary additional information and control data when necessary.

In the digital broadcast program transmission system 101, the multiplexing device 111 has the schedule
Although the description has been made assuming that the apparatus includes the 11a, the scene description management unit 111c, and the retransmission data management unit 111d, these may of course be provided outside the multiplexing device 111.

(Third Embodiment) This embodiment is similar to the third embodiment.
The present invention relates to a digital broadcast program receiver for receiving a program transmitted by the digital broadcast program transmission system according to the second embodiment.

FIG. 25 shows the configuration of the digital broadcast program receiving apparatus 201 of the present embodiment. The point that the program is received, decoded, and the image and the sound are synthesized based on the scene description is shown in FIG. The configuration is the same as Therefore, FIG.
In FIG. 5, the same parts as those in FIG. The difference from the apparatus of FIG. 2 is that scene description execution determining means 2 determines whether or not to process a scene description based on time information between a processed scene description and a newly received scene description.
04a has been added.

That is, scene description execution determining means 204
a stores the time of a command related to the same data ID and attribute executed in the past for each data ID and attribute, and newly determines whether to execute the newly received scene description command of the same data ID and attribute. The execution of the new command is permitted only when there is no command executed in the past or when the time is smaller than the time of the command executed. This makes it possible to properly process repeatedly retransmitted scene description data.

The operation of the scene description processing device 204 including the scene description execution determining means 204a will be described with reference to the flowchart of FIG. First, initialization processing such as a scene description table is performed (S2601), and a scene description is obtained from the decoder 203 (S2602), and step S260 is performed.
3, each scene description command included in the scene description is inserted into the scene description table in chronological order (S2604).
Step 2604 is skipped, and one command is obtained from the scene description table (S2605).

If it can be obtained in step S2606, the current relative time from the start of the program is obtained (S2607), and the time of the command is compared with the relative time (S2608). If the time of the command is less than or equal to the relative time in step S2608, a scene description execution determination process is performed as to whether this command can be executed (S2609). If the command can be executed in step S2610, the command is executed (2611). (S251)
3) If there is no switching request, the process returns to step S2602; otherwise, the process ends.

If no command can be obtained in step S2606, the flow shifts to step S2612. If NO in step S2608, the command is returned to the scene description table by one to postpone the execution of this command (S2613), and the flow shifts to step 2512.
If it is determined in step 2610 that the command cannot be executed, the corresponding command is discarded, and the process proceeds to step 2612.

The operation of the scene description execution determining means 204a will be described with reference to the flowchart of FIG. First, a command having a data ID and an attribute of a command whose execution is to be checked is acquired from the executed command table (S2701). If the command can be acquired in step S2702, the time of the acquired command and the time of this command are obtained. The time is compared (S2703). If the time of this command is not greater, it is assumed that this command is a retransmitted command and that a command newer than this command has been received and executed, and this command is executed. Is determined to be impossible (S2704).

If the command cannot be obtained in step 2702, it is considered that the command of the corresponding data ID and attribute has not been received yet, and this command is added to the executed data table (S2705), and this command can be executed. Is determined (S2707). If YES in step S2703, this command is regarded as newer than the obtained command, and the obtained command in the executed command table is replaced with this command (S270).
6), it is determined that this command can be executed (S270)
7).

As described above, the scene description acquired from the decoder 203 is executed based on the time information of the processed scene description command and the newly received scene description command to determine whether or not the scene description command can be processed. By adding the judging means 204a, it becomes possible to appropriately process the retransmitted scene description.

[0105]

As described above, according to the present invention, control data is divided and only necessary additional information and control data are transmitted when necessary, so that the transmission bandwidth of data broadcast data can be efficiently reduced. It is possible to provide a broadcast system that can be used in various ways, a broadcast program transmission system suitable for use in the broadcast system, and a receiving device therefor.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a digital broadcast program transmission system of a broadcast system according to a first embodiment of the present invention.

FIG. 2 is an exemplary block diagram showing the configuration of the digital broadcast program receiving apparatus according to the embodiment;

FIG. 3 is an exemplary view showing an example of a program configuration in the system according to the embodiment;

FIG. 4 is an exemplary view showing an example of program data in the program creation device of the embodiment.

FIG. 5 is a diagram showing an example of a scene description in the program creation device according to the embodiment.

FIG. 6 is a flowchart showing a multiplexing processing operation in the multiplexing apparatus of the embodiment.

FIG. 7 is a flowchart showing a retransmission data selection processing operation in the retransmission data management means of the embodiment.

FIG. 8 is a block diagram showing a configuration of a digital broadcast program transmission system of a broadcast system according to a second embodiment of the present invention.

FIG. 9 is an exemplary flowchart showing the operation of scene description division processing in the scene division means of the embodiment.

FIG. 10 is a view showing an example of a divided scene description table in the scene dividing means of the embodiment.

FIG. 11 is an exemplary flowchart showing an example of a schedule processing operation in the scheduling means of the embodiment.

FIG. 12 is an exemplary flowchart showing another example of the schedule processing operation in the scheduling means of the embodiment.

FIG. 13 is a view showing an example of an encoded data table in the scheduling means of the embodiment.

FIG. 14 is a view showing an example of a scheduled data table (all divided scene descriptions are already scheduled) in the scheduling means of the embodiment.

FIG. 15 is a diagram showing an example of a scheduled data table (all data has been scheduled) in the scheduling means of the embodiment.

FIG. 16 is a flowchart showing a multiplexing operation in the multiplexing means of the embodiment.

FIG. 17 is a flowchart showing a data multiplexing operation in the multiplexing means of the embodiment.

FIG. 18 is a flowchart showing retransmission data registration processing in the multiplexing means of the embodiment.

FIG. 19 is a flowchart showing a data registration operation in the scene description management means of the embodiment.

FIG. 20 is a flowchart showing a data registration operation in the retransmission data management means of the embodiment.

FIG. 21 is a flowchart showing the flow of retransmission data acquisition processing by the scene description management unit and the retransmission data management unit according to the embodiment;

FIG. 22 is an exemplary view showing an example of management information in a scene description management unit of the embodiment.

FIG. 23 is a view showing an example of a scene description of the data ID 10 in the scene description management means of the embodiment.

FIG. 24 is a diagram showing an example of data including retransmission in the scheduling means of the embodiment.

FIG. 25 is a block diagram showing a configuration of a digital broadcast program receiving device according to a third embodiment of the present invention.

FIG. 26 is a flowchart showing scene description processing in the scene description processing device of the embodiment.

FIG. 27 is a flowchart showing a judgment process in a scene description execution judgment means of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Digital broadcast program transmission system 102 ... Material input device 103 ... Program storage device 104 ... Program creation device 105 ... Program transmission device 106 ... Encoder 107 ... Multiplexer 107a ... Retransmission data management means 108 ... Transmission device 110 ... Scene description division Means 111: Multiplexing device 111a: Scheduling means 111b: Multiplexing means 111c: Scene description management means 111d: Retransmission data management means 201: Digital broadcast program receiving device 202: Receiving circuit 203: Decoder 204: Scene description processing device 204a: Scene Description execution reversing means 205 image processing device 206 CRT 207 audio processing device 208 speaker

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Miyagawa 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office (72) Inventor Shigeru Tashiro 1-1-1, Shibaura, Minato-ku, Tokyo Stock Company Toshiba head office F-term (reference) 5C022 CA03 5C023 AA11 AA21 AA27 AA28 AA34 AA37 AA40 CA01 CA04 CA05 DA08 5K061 AA00 BB06 BB17 DD00 FF01 FF11

Claims (6)

[Claims] A program material input device for capturing program material data used in a broadcast program, and program material data captured by the program material input device are combined to determine at least the use start time and end time of each program material data. A program creation device for creating program management data including the program management data and scene description data indicating the temporal and spatial arrangement of each program material data; a program material data taken in by the program material input device and created by the program creation device A program storage device for storing the obtained program management data and scene description data, and sequentially reads out the program management data, scene description data, and program material data from the program storage device in accordance with a predetermined broadcast time. A program transmitting device, and program management data, scene description data, and program material data transmitted from the program transmitting device. An encoder group for compression, a multiplexing device for multiplexing the program management data, scene description data, and program material data compressed by the encoder group into one program data, and an input to the multiplexing device. The program management data, the scene description data, and the program material data thus obtained are repeatedly multiplexed within the allowable time, and at the time of retransmission, the currently necessary program material data is selected and multiplexed based on the program management data and the scene description data. 1. A broadcast program transmission system, comprising: a retransmission data management device for causing the transmission device to broadcast program data output from the multiplexing device. 2. The apparatus according to claim 1, further comprising a scene description dividing device for dividing scene description data created by said program creating device into predetermined units and outputting the divided units to corresponding encoders of said encoder group. The broadcast program transmission system according to the above. 3. A history of multiplexed divided scene description data is accumulated in the multiplexing device, and a command having the same material and the same attribute in each divided scene description data is used to store the history from the current time. A scene description management device that compresses the size of the divided scene description data by deleting old ones. The unit scene description data compressed by the scene description management device is sequentially multiplexed with other data by the multiplexing device. The broadcast program transmission system according to claim 2, wherein the broadcast program is transmitted. 4. The multiplexing apparatus according to claim 1, wherein the multiplexing device performs multiplexing based on at least one of use start time information, encoded data size, and overall data bandwidth of the divided scene description data and each program material data. 3. The broadcast program transmission system according to claim 2, further comprising a scheduler for determining the order of the broadcast programs. 5. The scheduler causes the multiplexing device to multiplex part or all of the scene description data and each program material data using the transmission bandwidth of the entire program. 5. The broadcast program transmission system according to claim 4, wherein the main broadcast and the additional broadcast are multiplexed in the transmission bandwidth of: 6. Program material data used in a broadcast program, program management data including at least a use start time and an end time of each program material data, and scene description data indicating a temporal and spatial arrangement of each program material data. A broadcast program receiving apparatus for selectively receiving and demodulating a plurality of broadcast signals to be compressed and multiplexed according to a predetermined broadcast time and broadcast as one program data, and reproducing a broadcast program, Data separating means for separating program material data, program management data, and scene description data multiplexed in a program from the received and demodulated one program data; program material data separated by the data separating means; A decoder group for decompressing the management data and the scene description data; and a program material data for each program material data based on the scene description data output from the decoder group. A scene description processing device that determines the combination, and a reproduction processing device that reproduces the image material data expanded by the decoder group in accordance with an instruction from the scene description processing device. A broadcast program receiving apparatus comprising: a scene description execution determining unit that determines whether to process a scene description based on time information of a processed scene description and a newly received scene description.