JPH0983896A - Digital video receiving device for simultaneous multi-channel display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital multi-channel simultaneous display system coping with a digital CATV and a digital TV broadcast system. SOLUTION: Proper data (in-frame coded video data or the like) to be selected and extracted by a multiplex data selection means 1 receiving multiplex data 101 in which coded data for plural programs are multiplexed are stored tentatively in an intermediate buffer means 2 to match the speed. A video decoding means 3 decodes the data 102 sequentially and a video reduction means reduces the data to a proper size. According to a write address 106 generated by an address generating means 6 by an address generation command 105 from the video decoding means 3, video image reduction data 104 of plural programs from the video image reduction means 4 are written to different addresses of a display frame memory means 5. Display data 107 from the display frame memory means 5 are subjected to D/A conversion, amplified and plural screens are displayed simultaneously on a video display means 7.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a digital CATV.
The present invention relates to a multi-channel simultaneous display digital video receiving device adapted to a digital video delivery service for simultaneously delivering a plurality of programs in a digital TV broadcasting system.

[0002]

2. Description of the Related Art In a conventional multi-channel simultaneous display television receiver disclosed in, for example, Japanese Unexamined Patent Publication No. 56-120276, an antenna input circuit 11 receives a television broadcast wave as shown in FIG. The video signal demodulation means 12
Channel control signal 202 from channel detection means 13
In accordance therewith, the received signal 201 of the antenna input circuit 11 is subjected to detection / demodulation and A / D conversion for each channel, and a digital video signal 204 is output. The channel detection means 13 controls the video signal demodulation means 12 so as to automatically detect all the channels within the reception area, and detects the tuning point. The write address generation circuit 14 generates a write address signal 205 from the video signal demodulation means 12 according to the video signal 204 of each channel. Read address generation circuit 1
5 is the first video signal 2 from the video signal demodulating means 12
According to 04, the read address signal 206 is generated. The display memory 16 writes from the video signal demodulation means 12 to the digital video signal 204 according to the write address signal 205 from the write address generation circuit 14, the read address signal 206 from the read address generation circuit 15 and the channel detection from the channel detection means 13. Read according to signal 203. The video display unit 7a performs D / A conversion and video amplification on the display data 207 from the display memory 16 and simultaneously displays the video of all received channels.

The conventional multi-channel simultaneous display television receiver described above adopts an analog system (analog multi-channel simultaneous display system) intended for current television broadcasting.

[0004]

In the conventional multi-channel simultaneous display television receiving apparatus as described above, since the analog system intended for the current television broadcasting is adopted, the processing is complicated and simultaneous delivery of a plurality of programs is required. There was a difficult problem in adapting to the digital video delivery service.

The problem to be solved by the present invention is to provide a system (digital multi-channel simultaneous display system) adapted to a digital video delivery service with a minimum hardware in a multi-channel simultaneous display digital video receiving device. .

[0006]

The multi-channel simultaneous display digital video receiving apparatus of the present invention is characterized in that the following means are provided to solve the above-mentioned problems and a digital multi-channel simultaneous display system is adopted.

The multiplexed data selecting means analyzes the type of data contained in each channel for the multiplexed data delivered by multiplexing the encoded data of a plurality of channels, and selects an appropriate encoded data, for example, the intraframe encoding. Video data of a plurality of consecutive frames is selectively extracted from the video data or the intra-frame encoded video data. Alternatively, for the multiplexed data having the packet header part indicating the channel category, the selected intraframe-coded data of the category designated by the receiving side or the data of a plurality of consecutive frames from the intraframe-coded data is extracted. .
Alternatively, for the multiplexed data, the intraframe coded data of the specified channel from the channel comparison means or the data of a plurality of consecutive frames from the intraframe coded data is selectively extracted. Alternatively, the combined screen data is selectively extracted from the multiplexed data from the combined screen multiplexing means.

The intermediate buffer means temporarily stores the selected data transferred from the multiplexed data selecting means to match the speed with the next processing.

The video decoding means and the video reduction means sequentially decode the selected data from the intermediate buffer means and give an instruction to generate a display frame memory address, and reduce the video decoded data to an appropriate size.

The display frame memory means writes the reduced image data of a plurality of channels from the image reducing means to different portions according to the write address from the address generating means.

The address generating means generates a display frame memory address for making a decision for each channel of the video decoded data according to an address generation instruction from the video decoding means.

The channel schedule management means is separately provided and monitors the stream of multiplexed data to decode the channel schedule.

The channel comparison means is separately provided and compares the channel decoded by the channel schedule management means with the channel of the category designated by the receiving side to specify the channel of the desired category.

The switching means is separately provided, and the intra-frame coded video data or the video data of a plurality of frames continuous from the intra-frame coded video data is added to the multiplexed data delivered by multiplexing the coded data of a plurality of channels. Of the selected intra-frame coded data or the intra-frame coded data of the category specified by the receiving side for the multiplexed data having the packet header section indicating the category of the channel. The multiplexed data selecting means for selectively extracting the data of the plurality of frames is switched at appropriate time.

The composite screen multiplexing means is separately provided and composites the reduced screens of the respective channels into one channel for multiplexing the multiplexed data.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a multi-channel simultaneous display digital video receiving apparatus according to an embodiment of the present invention has a multiplexed data selection means 1 for intra-frame / inter-coded video / video of a plurality of programs. For the multiplexed data 101 that is multiplexed with the audio data and distributed, the type of data included in each packet of a plurality of programs is analyzed, and the image data and the intra-frame encoded data that are meaningful data are decoded by themselves and selected. Extract. The intermediate buffer means 2 temporarily stores the selected data 102 transferred from the multiplexed data selecting means 1 to match the next processing. The video decoding means 3 and the video reduction means 4 sequentially decode the selected data 102 from the intermediate buffer 2 and give an instruction to generate a display frame memory address, and reduce the video decoded data 103 to an appropriate size. The display frame memory means 5 writes the reduced video data 104 of a plurality of programs from different locations in the different locations in accordance with the write address signal 106 from the address generation means 6. The address generation means 6 is the video decoding means 3
A write address signal 106 of the display frame memory means 6, which is determined for each program, is generated for the video decoded data 103 according to the address generation instruction signal 105 from. The video display means 7 performs D / A conversion and video amplification on the display data 107 from the display frame memory means 6 and simultaneously displays videos of a plurality of programs. For example, W / (Y / 2) pixels × R / (Y / 2) at the timing of operation of each processing unit shown in FIG.
A plurality of screens having a reduced size of pixels (when the display screen size is W pixels × R pixels and the number of programs Y included in the multiplexed data 101) can be displayed simultaneously.

The multi-channel simultaneous display digital video receiving apparatus of the above embodiment adopts a system (digital multi-channel simultaneous display system) adapted to a digital video delivery service with minimum hardware.

In the embodiment of the invention described above, the multiplexed data selecting means 1 has been described as selectively extracting the intra-frame coded video data included in each packet of a plurality of programs, but first, for example, as shown in FIG. Packet P _{n of} program 1
/ In-frame / inter-frame encoded video data included in P _{n + 4,} and then in-frame included in packet P _{n + 6} / P _{n + 8} of program 2 /
It is also possible to selectively extract the inter-coded video data. Similarly, as shown in FIG. 4, for example, first, the intra-frame / inter-frame encoded video data included in the packet P _m / P _{m + 1} of the program 1 and then the intra-frame / interval containing the packet P _{m + 1} / P _{m + 5} of the program 3 It is also possible to selectively extract the inter-coded video data. Video data of multiple programs can be taken out by sequentially selecting and extracting the decodable video data of consecutive multiple frames from the intra-frame coded video data of each program. You can quickly find the program you want.

Further, in the embodiment of the invention described above, the multiplexed data selection means 1 packetizes the header portion holding the category (news program, historical drama, drama, etc.) data of the program belonging to the packet as shown in FIG. For the multiplexed data 101 contained therein, the intra-frame encoded data of the category specified by the receiving side is selectively extracted, or the data of a plurality of consecutive frames is sequentially selected and extracted from the intra-frame encoded data. You may The processing on the transmitting side and the receiving side allows the receiving side to quickly find a program that the receiving side wants to watch.

Further, in the embodiment of the invention described above, the multiplexed data selecting means 1 monitors the stream of the multiplexed data 101 and decodes the data 108 indicating the program schedule, as shown in FIG. An identification number 1 for specifying a program to be watched by issuing a category command 109 of the program to be watched from the side and comparing it with the decrypted data 108
10 is additionally provided, and the intraframe coded data of the program of the notified identification number 110 is selectively extracted or data of a plurality of consecutive frames from the intraframe coded data is notified. You may make it select and extract sequentially. By selecting and extracting the decodable video data of a type-specific program (for example, a comedy program), the video data of multiple programs can be taken out. You can find it quickly.

In the embodiment of the invention described above, the multiplexed data selecting means 1 synthesizes the reduced screens of the respective programs into one program as shown in FIG. 7A, and multiplexes the multiplexed data 101. It is also possible to separately provide the composite screen multiplexing means 10 for selecting and extracting the composite program. The processing on the transmitting side allows the receiving side to quickly find a program that the receiving side wants to watch. As shown in FIG. 7B, the composite screen multiplexing means 10 first sets the video coded data or video data 101-1 of each program.
The screens that have been decoded by the decoder or reduced by the reducer are combined by the screen combiner. Next, the combined screen data is encoded by an encoder and multiplexed by the multiplexer 101.
Are multiplexed and output as multiplexed data 101a including the combined screen data shown in FIG. 7C to the multiplexed data selecting means 1. Needless to say, the time division processing may be performed by the single decoder and the reducer.

[0022]

The multi-channel simultaneous display digital video receiving apparatus of the present invention as described above adopts the digital multi-channel simultaneous display system adapted to the digital video delivery service with the minimum hardware. Compared to the analog system for digital
In addition to being applicable to simultaneous delivery of a plurality of programs in a digital TV broadcasting system, each invention has the following effects. (1) By the processing on the receiving side, suitable data can be extracted from the multiplexed data of a plurality of programs, and the receiving side can quickly find a desired program from a plurality of screens on the same screen. (2) A category (news / comedy / comedy) specified from the multiplexed data of the simultaneous broadcast program by the processing of the transmitting side and the receiving side.
It is possible to quickly find the desired program from multiple screens on the same screen on the receiving side by performing extraction processing of movie programs, etc.). (3) By the processing on the transmitting side, extraction processing of the combined screen data is performed from the multiplexed data of the combined program, and the receiving side can quickly find a desired program from a plurality of screens on the same screen.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a multi-channel simultaneous display digital video receiving apparatus showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating an operation timing of simultaneous display of a plurality of screens.

FIG. 3 is a diagram for explaining another embodiment of the multiplexed data selection means shown in FIG.

FIG. 4 is a diagram for explaining another embodiment of the multiplexed data selection means shown in FIG.

5 is a diagram for explaining another embodiment of the multiplexed data selection means shown in FIG.

FIG. 6 is a diagram for explaining another embodiment of the multiplexed data selection means shown in FIG.

FIG. 7 is a diagram for explaining another embodiment of the multiplexed data selection means shown in FIG.

FIG. 8 is a functional block diagram of a multi-channel simultaneous display television receiving device showing a conventional technique.

[Explanation of symbols]

1 multiplexed data selection means, 2 intermediate buffer means, 3
Video decoding means, 4 video reduction means, 5 address generation means, 6 display frame memory means, 7 video display means,
8 program schedule management means, 9 program comparison means, 1
0 composite screen multiplexing means, 101 multiplexed data, 10
1a multiplexed data including composite screen data, 101-1
To n video encoded data or video data, 102 selection data, 103 video decoded data, 104 video reduced data, 105 address generation instruction signal, 106 write address signal, 107 display data, 108 program data, 109 program type instruction, 110 program Identification number. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (6)

[Claims] 1. Multiplexed data selection means for analyzing the type of data contained in each channel for multiplexed data delivered by multiplexing encoded data of a plurality of channels and selecting and extracting appropriate encoded data, Intermediate buffer means for temporarily accumulating the selected data transferred from the multiplexed data selecting means and matching the speed with the next process, and sequentially decoding the selected data from the intermediate buffer means and generating a display frame memory address. Video decoding means for reducing the video decoded data from the video decoding means to an appropriate size, and different video reduced data of a plurality of channels from the video reducing means according to the write address from the address generating means. The display frame memory means to be written in the location and the video image according to the address generation instruction from the video decoding means. A multi-channel simultaneous display digital video receiving apparatus, comprising: the address generating means for generating a display frame memory address for determining a channel of image decoded data. 2. The intra-frame coded video data or the video data of a plurality of consecutive frames from the intra-frame coded video data is selectively extracted from the multiplexed data by the multiplexed data selection means. The multi-channel simultaneous display digital video receiving apparatus according to claim 1. 3. From the intra-frame coded data of the category specified by the receiving side, or the intra-frame coded data of the category specified on the receiving side, for the multiplexed data having the packet header section indicating the category of the channel by the multiplexed data selection means. 2. The multi-channel simultaneous display digital video receiving apparatus according to claim 1, wherein continuous plural frames of data are selectively extracted. 4. A channel schedule management means for monitoring a stream of multiplexed data by a multiplexed data selection means and decoding a channel schedule, a channel decoded by the channel schedule management means, and a channel of a category designated from a receiving side. And a channel comparison unit for specifying a channel of a category to be viewed separately are provided, and the intra-frame encoded data of the channel specified by the channel comparison unit or the intra-frame encoding for the multiplexed data is provided. 2. The multi-channel simultaneous display digital video receiving apparatus according to claim 1, wherein continuous plural frames of data are selectively extracted from the data. 5. The multiplexed data selecting means according to claim 2 or 3, further comprising both the multiplexed data selecting means according to claim 2, and a switching means for switching the means at a proper time is separately provided. Channel simultaneous display digital video receiver. 6. A composite screen multiplexing means for separately combining the reduced screens of the respective channels by the multiplexed data selecting means to form one channel and multiplexing the multiplexed data is provided, and the multiplexing from the composite screen multiplexing means is performed. 2. The multi-channel simultaneous display digital video receiving apparatus according to claim 1, wherein the composite screen data is selectively extracted from the converted data.