JP3221524B2 - Digital television broadcast receiver and broadcast system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital television broadcasting in which a plurality of sets of video information and audio information are compressed, multiplexed and digitally modulated and transmitted. The present invention relates to a digital television broadcast receiver and a broadcast system suitable for multi-screen display simultaneously displayed on the screen.

[0002]

2. Description of the Related Art In order to make effective use of a limited number of channels such as terrestrial broadcasting, satellite broadcasting and communication satellites, one channel of analog television broadcasting is one program service. Multi-channel digital television broadcasting that provides a plurality of program services in one channel of an analog transmission band by using the technology and the digital modulation technology is planned.

[0003] Such a multi-channel digital television broadcasting system is described in the Ministry of Posts and Telecommunications, "(Interim report on a long-term vision for satellite broadcasting technology)"
"Month" has a disclosure example. In addition, there is a disclosure example of digital image compression in the document as “Representative digital compression coding scheme configuration and elemental technology”.

FIG. 9 is a schematic diagram of the disclosed example (multi-channel digital television broadcasting system). FIG.
1, 1 is a transmitter, 2 (2A to 2n) is a video coding unit, 3 (3A to 3n) is a voice coding unit, 4 is a data coding unit, 5 is a time division multiplexing unit (TDM), 6 Denotes error correction coding means, 7 denotes digital modulation means, and 8 denotes frequency conversion / amplification means.

[0005] In addition, 9 is a receiver, 10 is amplification / tuning means, 11 is digital demodulation means, 12 is error correction decoding means, 13 is program selection means, 14 is video decoding means,
15 is a data decoding means, 16 is a voice decoding means, 10
0 (100A to 100n) is a video signal input terminal, 101
(101A to 101n) are audio input terminals, 102 is a data input terminal, 103 is a transmission output terminal, and 104 is a reception input terminal.

In FIG. 9, in a transmitter 1, a plurality of sets of video information are input from video signal input terminals 100A to 100n, and digital image compression is performed by video coding means 2A to 2n, respectively. Information, and audio information accompanying the video, audio input terminals 101A to 101A
1n, and each of the voice encoding means 3A to 3n
Then, a plurality of sets of compression-encoded audio information are digitally compressed, and related and other information are input from the data input terminal 102 and encoded by the data encoding means 4 to become additional data.

[0007] The information is subjected to, for example, interleave multiplexing by the time division multiplexing means 5, subjected to error correction coding processing by the error correction coding means 6, further digitally modulated by the digital modulation means 7, and subjected to frequency conversion. The signal is frequency-converted and amplified by the amplifying means 8 and transmitted as a digital modulation signal from the transmission output terminal 103 via a radio wave, a coaxial cable, an optical cable or the like.

In the receiver 9, a digitally modulated signal is input from a reception input terminal 104, selected by an amplifying / tuning means 10, and then digitally demodulated by a digital demodulating means 11.
The error correction is decoded by the error correction decoding means 12, and the interleave multiplex is decompressed by the program selection means 13, and one (that is, one set) of compressed coded video information, compressed coded audio information, Is selected, the video decoding means 14 decodes the compression-encoded video information, the data decoding means 15 decodes the additional data, and the audio decoding means 16 decodes the compression-coded audio information. An image display and audio output are obtained by a digital signal processing means (not shown).

A conventional analog television broadcasting receiver has a multi-screen display function of simultaneously displaying two screens on a common display screen as an additional function. For example, a child screen in which a program of another channel is reduced with respect to the main screen. A disclosure example of a technique for displaying a screen at the same time as a parent screen (Japanese Patent Laid-Open No. 62-10267)
No. 1) and a technique for simultaneously displaying programs on different channels as a plurality of small screens (see Japanese Patent Application Laid-Open No.
No. 2-13176).

[0010]

In a conventional analog television broadcast receiver, a simple analog demodulator may be used as a demodulating means for obtaining a video signal from a modulated signal. Even if a plurality of analog demodulators are required for multi-screen display of a moving image, the circuit scale is smaller than that of the whole analog television broadcast receiver, and the problem is to simultaneously display images as described in the above-mentioned prior art. It was on the screen display.

However, in order to obtain a video signal from a modulated signal in a multi-channel digital television broadcast receiver, as described in the above-mentioned prior art, after digital demodulation, error correction decoding is performed, and program selection means 13 is used. (FIG. 9), one piece of compression-encoded video information is selected, and further, it is obtained by decoding the compression-encoded video information by the video decoding means 14, and its circuit scale is multichannel digital television broadcasting receiver. It is large and expensive compared to the whole, and it is difficult to arrange a plurality of all of these sets in order to realize a multi-screen display function.

In the screen display, the information amount of the child screen is smaller than the information amount of the parent screen. For this reason, if the decoding of the compressed coded video information as the child screen is performed by the video efficient decoding means similar to that of the parent screen, an information compression means for further converting to a child screen after decoding is required, which is increasingly complicated. , Will be expensive.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and in a multi-channel digital television broadcast receiver, images of a plurality of sets of video information can be simultaneously displayed on a display screen without increasing the scale of demodulation means. It is an object of the present invention to provide a digital television broadcast receiver and a broadcasting system that enable multi-screen display.

[0014]

The above object is achieved as follows. That is, a means for selecting a desired plurality of pieces of compressed coded video information from among a large number of pieces of compressed coded video information constituting one channel after error correction decoding in a program selection means on the digital television broadcast receiver side. And decodes one of the selected plurality of pieces of compression-encoded video information as main screen information and the other as sub-screen information, and displays the multi-screen.

Further, for example, screen-related information, which is a type of additional data, is displayed in accordance with the parent screen and the child screen. In addition, a plurality of compression-encoded video information is sequentially selected, sequentially decoded as small-screen information, and displayed on a multi-screen. Further, the decoding of the child screen information is performed by decoding the simplified means with respect to the video decoding means of the main screen or the related information indicating the simplified decoding method such as information amount reduction in the additional data on the transmission side in advance. The additional data is transmitted, and decoding of the small screen information is performed based on the small screen decoding information included in the additional data.

Further, since the child screen information is a small amount of information in which information is reduced in advance from the parent screen information, the child screen information is converted on the transmitting side into information obtained by converting the parent screen into hierarchical information. Alternatively, the above object can be achieved by a configuration in which the data is transmitted as a part of the additional data.

[0017]

In a program selecting means for selecting compression-encoded video information, a plurality of pieces of desired compression-encoded video information obtained by deinterleaving multiplexing are taken out, and one of them is used as main screen information as in conventional ones. Decoding is performed by the video decoding means (main screen video decoding means), and decoding is performed by the simplified video decoding means (small screen video decoding means). The decoding means is simplified.

At this time, more information can be obtained by displaying the additional data, for example, the related information of the screen on the screen in accordance with the parent screen or the child screen. Further, the simplified decoding of the compressed and coded video information serving as the child screen, which is performed based on the data included in the additional data, is performed by the data reduction method (that is, the simplified decoding method) of the data included in the additional data. , The small-screen video decoding means is simplified.

The program selecting means is simplified by sequentially decoding the compressed and coded video information of each program by the small picture video decoding means using the deinterleaved multiplexed sequential information. In addition, the video information on the transmitting side is hierarchized information including the information for the parent screen and the information for the child screen, and the information for the child screen is associated with the child screen. Simplified.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram showing a digital television broadcast receiver as one embodiment of the present invention.
In FIG. 1, the same reference numerals are given to the same functional blocks as those in FIG.

In FIG. 1, 14A is a main screen video decoding means, 14B is a small screen video decoding means, 17 is a demultiplexer means, 18A is a main screen video temporary storage means, 18
B is a child screen video temporary storage means, 19 is a data temporary storage means, 20 is an audio data temporary storage means, 21 is a screen synthesizing /
A video processing means, 22 is an image display means, 23 is a data processing means, 24 is an audio processing means, 25 is an audio output means, and a control system for controlling the whole which is generally considered necessary is omitted. .

Referring to FIG. The digital modulation signal input from the reception input terminal 104 is amplified by the amplifying / tuning means 10.
, The digital demodulation means 11 digitally demodulates the data, and the error correction decoding means 12 performs error correction decoding to obtain multiplexed compressed and encoded information.
3 is input.

The program selecting means 13 includes at least a demultiplexer means 17, a main screen video temporary storage means 18A, a small screen video temporary storage means 18B, and a data temporary storage means 19
And the multiplexed compression-coded information is deinterleaved by the demultiplexer 17 to obtain the parent screen video data selected as the parent screen and the child screen information selected as the child screen. And the additional data and audio data related to the main screen video temporary storage means 18A, the sub-screen video temporary storage means 18B, the data temporary storage means 19, and the audio data temporary storage means 20 respectively.
Is temporarily stored.

The compressed coded video information of the main screen video temporary storage means 18A is decoded by the main screen video decoding means 14A, and the compressed coded video information of the small screen video temporary storage means 18B is decoded by the small screen video decoding means. The image is decrypted at 14B, and the screen combining / video processing means 21 performs screen composition and video processing of the parent screen and the child screen to be displayed by the image display means 22. The compression-encoded audio information in the audio data temporary storage unit 20 is decoded by the audio decoding unit 16, processed by the audio processing unit 24, and the audio output unit 25 outputs analog audio.

Conventionally, video information has been
Although only one piece of compression-encoded video information has been deinterleaved by the demultiplexer means 17, in the present invention, compression-encoded video information of a parent screen corresponding to one piece of conventional compression-encoded video information and new Both of the compressed and coded video information of the child screen are deinterleaved and multiplexed by the demultiplexer means 17, and the parent screen is decoded by the parent screen video decoding means 14A, and the child screen is decoded by the child screen video decoding means 14B. Decoding is performed.

The small-screen decoding means 14B can be simplified compared to the main-screen video decoding means 14A because the amount of information handled is small. The additional data in the data temporary storage unit 19 is decoded by the data decoding unit 15, the relevant information of the parent screen and the child screen is extracted by the data processing unit 23, and the extracted information is input to the screen composition / video processing unit 21. The image is combined with the child screen and displayed on the image display means 22. This allows the viewer to know more program information. In the present invention, only one set of the small-screen video temporary storage means 18B and the small-screen video decoding means 14B are provided. However, it is apparent that more sub-screens can be displayed on the screen if a plurality of sets are provided.

FIG. 2 is an explanatory diagram for explaining the operation of program selection by the program selection means 13 of FIG. Examples of transmission formats for digital television video information are:
“Study of ISDB Transmission Method in 12 GHz Digital Satellite Broadcasting” Television Society Technical Report Vol. 16,
No. 7, pp. 13 to 18 (Jan. 1992). FIG. 2 is a diagram illustrating selection of parent screen video data and child screen video data performed according to the present invention, taking the transmission format of the disclosure example as an example.

Referring to FIG. FIG. 2 is a diagram illustrating only video data, and omits audio data and additional data. The video information is transmitted by a bit stream including a frame in which m sectors are interleaved and multiplexed. On the receiver side, the interleaved multiplexing of this sector is released, and only the target sector is read.

For example, sector No. 1 and 2 are programs to be received as parent screens, and sector Nos. Assuming that programs 5 and 6 are to be received as child screens, sector Nos. Only the data of the sector No. 1 and 2 are read into the main screen video temporary storage 18A, Similarly, only the data of Nos. 5 and 6 are read into the small-screen video temporary storage 18B, and are decoded by the decoding means 14A and 14B, respectively.

FIG. 3 is a block diagram showing a digital television broadcast receiver as another embodiment of the present invention. FIG. 3 shows an embodiment in which more small screens are displayed as compared with the embodiment shown in FIG. 1, and is an embodiment in which a circuit for this is simplified. The same reference numerals are given to functional blocks similar to those in FIG.

In FIG. 3, reference numerals 18B1 to 18Bn denote temporary storage units for small-screen images, and 26 denotes a sequential reading unit. In response to the increase in the number of child screens, instead of providing a plurality of combinations of the child screen video temporary storage means 18B and the child screen video decoding means 14B, a plurality of child screen video temporary memories corresponding to the number of child screens are provided. Storage means 18B1 to 18Bn
And one sequential reading means 26 and one small-screen video decoding means 14B.
The required number of B is reduced.

Referring to FIG. Demultiplexer means 1
7, the compressed and coded video information of a plurality of sub-screens, which have been deinterleaved by
8B1 to 18Bn, and sequentially read them out.
Thus, by sequentially inputting and decoding the small-screen video decoding means 14B, a program list display including a plurality of small-screens and program information from additional data can be easily performed. By looking at the program list display, it is possible to determine which program is to be viewed as the parent program.

FIG. 4 is an explanatory diagram of the program selecting operation in FIG. Please refer to FIG. Frame n and Frame n +
1, sectors 1 and 2, sector 3 and 4, sector 5 and 6, frame n + 1, sector 1 and 2, and sector 3 and 4 of frame n are video information of different programs. Let 2 be the current parent screen. In this example, in order to display a plurality of small screens, only the video data of the corresponding sector from the interleaved multiplex as in FIG.
18B5, the small-screen image temporary storage means 18B1
18B5 are sequentially read out by the reading means 26.
The small-screen video decoding means 14B is transmitted to the converter.

FIG. 5 is an explanatory diagram showing a screen display in the case of this example. Child screen 2 with the same content as the main screen on the main screen
Are displayed, and in the sub-screens,
Channels are displayed as related information, all programs can be viewed as a list, and programs can be easily selected.

FIG. 6 is a block diagram showing an embodiment of a digital television broadcasting system according to the present invention.
In FIG. 6, the same reference numerals are given to the same functional blocks as those in FIGS. 1 and 9, but the audio coding related elements are omitted.

In FIG. 6, reference numerals 2A1 to 2An denote main screen video encoding means, and 2B1 to 2Bn denote sub screen information extracting means. The data processing means 23 on the receiver side is connected to the small-screen video decoding means 14B and the screen synthesizing / video processing means 21.

In the transmitter 1, the sub-screen information extracting means 2
According to B1 to 2Bn, when each parent screen is changed to a child screen, relevant information for performing a simplified decoding method such as how to reduce the amount of information from the parent screen to change to a child screen is extracted. , And the data is encoded by the data encoding means 4 and transmitted.

On the receiver side, decoding of the small-screen compression-encoded video information is decoded based on small-screen simplified decoding method information (related information) included in the additional data. Data decoding means 15, data processing means 23, small-screen video decoding means 1
4B is a means for performing such processing. By decoding the child screen based on the additional data (specifically, related information included in the additional data) in this manner,
Since the data reduction decoding method and other information are obtained in advance from the additional data, the small-screen video decoding means 14B can be simplified.

FIG. 7 is a block diagram showing another embodiment of the digital television broadcasting system according to the present invention. 7, the same reference numerals are given to the same functional blocks as those in FIG. In FIG. 7, reference numerals 2C1 to 2Cn denote small-screen video encoding means.

Referring to FIG. In the transmitter 1, each of the main screens is coded into the sub-screen compression coded video information by the sub-screen video coding means 2C1 to 2Cn, and the video information (parent screen information and child screen information) is stored in a plurality of layers. It is transmitted as hierarchical information having a structure. Here, the small-screen compression-encoded video information is made to correspond to one of the hierarchical video information.
On the receiver side, the demultiplexer 17 temporarily stores the small-screen compressed encoded video information in the hierarchical video information in the small-screen video temporary storage means 18B, and
The sub-screen is decoded by 4B.

By making the video information hierarchical information on the transmitting side and making a part of the hierarchical information correspond to the sub-screen, the video decoding means 14B for the sub-screen on the receiver side is simplified, and the digital TV can be constructed with a simpler configuration. A John broadcasting receiver and a broadcasting system can be configured. Further, there is an effect that a receiver for displaying a small screen can be easily realized by using the hierarchical information of the child screen. Even if the layered information of the child screen is transmitted as a part of the additional data, the gist of the present invention is not spoiled. Further, the present embodiment describes an example in which the hierarchical information is transmitted by time division multiplexing. However, it is obvious that the present invention can also be realized by a method of transmitting the hierarchical information by a plurality of carrier signals.

FIG. 8 is an explanatory diagram showing an example of hierarchization of video information. As can be seen in the figure, the original video information
And at least necessary to compose the sub-screen with the original video information
Information (for example, simplified to correspond to the sub-screen pixels)
The transmission of the divided video information as one piece of video information is hierarchical transmission of video information.

On the receiving side, the small screen stores only the small screen information of the transmitted video information in the small screen image temporary storage means 18B.
(FIG. 7) and read the small-screen video information decoding means 14B.
Then, the sub-screen is decrypted. In the case of the main screen, all of the video information is read into the main screen video information temporary storage means 18A,
The main screen video information decoding means 14A decodes the main screen.

[0044]

According to the present invention, a plurality of pieces of compressed coded video information obtained by deinterleaving multiplexing are taken out by a means for selecting compressed coded video information by a program selecting means on the receiver side, and one of them is taken out. As the main screen information, decoding is performed by the same video decoding means (main screen video decoding means) as before,
By performing decoding by a video decoding unit (small screen video decoding unit) that simplifies the other aspects, there is an advantage that the program selection unit and the small screen video decoding unit can be simplified.

Further, there is an advantage that more program information can be known by displaying additional information, for example, screen-related information on the screen in accordance with the parent screen and the child screen. Further, the decoding means for simplifying the compression-encoded video signal serving as a child screen based on the additional data uses a method of reducing data (a method of reducing data from a parent screen to obtain a child screen). Since it is obtained from the additional data, there is an advantage that the small-screen video decoding means can be simplified.

In the program selection means, the small picture video decoding means is simplified by sequentially decoding it with the small picture video decoding means using the sequential information obtained by deinterleaving the compressed and coded video information of each program. For example, there is an advantage that a program list display including a plurality of child screens and program information from additional data can be easily displayed.

The transmitting side uses the video information (parent screen information and child screen information) as hierarchical information, and associates a part of the hierarchical information with the child screen so that the child side on the receiver side can be used. There is an advantage that the screen image decoding means is simplified and a digital television broadcast receiver and a broadcasting system can be configured with a simpler configuration. Further, there is an advantage that a receiver for displaying a small screen can be easily realized by using the hierarchical information of the child screen.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a digital television broadcast receiver as one embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a program selecting operation in a program selecting means 13 of FIG. 1;

FIG. 3 is a block diagram showing a digital television broadcast receiver as another embodiment of the present invention.

FIG. 4 is an explanatory diagram of a program selecting operation in FIG. 3;

FIG. 5 is an explanatory diagram showing a screen display example in the embodiment of FIG. 3;

FIG. 6 is a block diagram showing a digital television broadcasting system according to an embodiment of the present invention.

FIG. 7 is a block diagram showing another embodiment of the digital television broadcasting system according to the present invention.

FIG. 8 is an explanatory diagram showing an example of hierarchization of video information.

FIG. 9 is a schematic diagram showing a conventional example of a multi-channel digital television broadcasting system.

[Explanation of symbols]

2A1 to 2An: main screen video encoding means, 2B1 to 2B
n: small screen information extracting means, 2C1-2Cn: small screen video coding means, 13: program selection means, 14A: main screen video decoding means, 14B: small screen video decoding means, 18A ...
Main screen image temporary storage means, 18B: child screen image temporary storage means, 21: screen synthesis / image processing means.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Adachi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi, Ltd.Video Media Research Laboratories (72) Kazuo Nakagawa, Inventor Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Reference numeral 292, Hitachi, Ltd. Image Media Research Laboratories (56) References JP-A-5-328321 (JP, A) JP-A-6-276508 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) H04N 5/45

Claims (11)

(57) [Claims] A broadcast signal of one channel is obtained by multiplexing a plurality of pieces of program information composed of compression-encoded video information, compression-encoding audio information, and additional data, then performing error correction coding, and further digitally modulating the multiplexed information. Receiving means for receiving multiple channels of such a broadcast signal, selecting a channel from the multiple channels, and performing digital demodulation for the selected channel. In a digital television broadcast receiver comprising: a digital demodulation means; and an error correction decoding means for performing error correction decoding on one channel after the digital demodulation, wherein one channel after the error correction decoding by the error correction decoding means is provided. Program selection means for selecting any desired plurality of program information from a plurality of sets of program information constituting One or more videos to be decoded, respectively, with the compressed coded video information belonging to one program as the main screen information and the compressed coded video information belonging to the remaining program information as the sub-screen information among the plurality of pieces of program information thus obtained. Decoding means, and image display means for displaying the obtained parent screen information as a parent screen and child screen information as child screens on the same screen after video decoding , and the video decoding means. Is the parent screen information
For the main screen to decode the compressed and encoded video information as
Means and a plurality of means each selected as sub-screen information
For compression-encoded video information, this is sequentially selected and
Decoding device for small screens common to multiple small screen information to be decoded one by one
And a digital television.
Broadcast receiver. 2. The digital television broadcast receiver according to claim 1, wherein said program selection means selects said program.
One or more specific programs from among multiple
Select information, extract additional data belonging to it, and decrypt
Data decrypting means for decrypting the additional data
The image displayed on the same screen together with the parent screen and the child screen
Display means, further comprising:
TV receiver. 3. The digital television broadcast receiver according to claim 1 , wherein the child screen information is a parent picture.
Original compression marks Goka video information to be used for the decoding side information
Information obtained by decrypting the information
Digital television comprising screen information
John Broadcast Receiver. 4. The compression-encoded video information and the compression-encoding audio information.
Program information consisting of information and additional data,
After multiplexing by the multiplexing means, the error correction coding means
More error correction coding and digital modulation means
Digitally modulated by the
A transmitter that transmits as
Side uses the compression-encoded video information as the main screen information
The child screen information is used for the compression coding which is for the main screen information.
Processing and creating video information
Processing related information that represents the data used for
A television transmitter for transmitting in the additional data, and a multi-channel of the broadcast signal transmitted and transmitted.
Minutes, and from among the multiple channels, one channel
Channel selection means for selecting a channel and one channel selected
Demodulation means for performing digital demodulation
And error correction for one channel after digital demodulation
Error correction decoding means for performing decoding, and one channel after error correction decoding by the error correction decoding means.
Any desired information from a plurality of sets of program information constituting a channel
Program selection means for selecting a plurality of pieces of program information;
Additional data belonging to the program information selected by the selecting means
Data decoding means for decoding and the program selection means.
One specific program from the selected plurality of program information
The compression-encoded video information belonging to the
Video decoding means for the main screen to be
To the compressed encoded video information by the data decoding means.
The processing-related information contained in the additional data
Generates and decodes child screen information by processing using
Video decoding means for a child screen, and the parent obtained after video decoding.
The screen information is used as the parent screen, and the child screen information is used as the child screen.
The image display means for displaying each on the same screen.
Digital television receiver, comprising: a digital television receiver provided in a digital television receiver;
system. 5. Program information comprising compression-encoded video information, compression-encoding audio information, and additional data is multiplexed by multiplexing means, and error-correction coding is performed by error correction coding means. A transmitter for digitally modulating by a digital modulating means and transmitting it as a broadcast signal for one channel. At the time of the transmission, the receiving side uses the compression-encoded video information for main screen information, as be created by processing the compressed coded video information is for a parent screen information, and characterized in that the process-related information that represents the data used in the method and processing of the processing, and transmits included in the additional data TV
John transmitter. 6. A channel selecting means for receiving multiple channels of the broadcast signal transmitted and transmitted , and selecting one channel from the multiple channels, and digitally selecting one channel from the selected channels. In addition to digital demodulation means for performing demodulation and error correction decoding means for performing error correction decoding on one channel after digital demodulation, one channel after error correction decoding by the error correction decoding means is configured. Program selecting means for selecting any desired plural pieces of program information from a plurality of sets of program information to be executed; data decoding means for decoding additional data belonging to the program information selected by the program selecting means; And decodes the compression-encoded video information belonging to one specific piece of program information from the plurality of pieces of program information selected as the main screen information. A sub-screen by processing the main screen video decoding means and the compression-encoded video information belonging to the remaining program information using the processing related information included in the additional data decoded by the data decoding means. Image decoding means for generating and decoding information, and image decoding means for decoding the obtained main screen information as a main screen after decoding the image, and displaying the sub-screen information as a sub-screen on the same screen, Digital television reception, further comprising:
Machine. 7. The broadcast signal transmitted and transmitted.
Of the multi-channel of the
Channel selection means for selecting one channel, and
Data for digital demodulation for one channel
Digital demodulation means and one channel after digital demodulation
Error correction decoding means for performing error correction decoding on
And one channel after error correction decoding by the error correction decoding means.
Any desired information from a plurality of sets of program information constituting a channel
And program selection means for selecting a plurality of program information, before Symbol program selection
Additional data belonging to the program information selected by the selecting means
Data decoding means for decoding and the program selection means.
One specific program from the selected plurality of program information
The compression-encoded video information belonging to the
Video decoding means for the main screen to be
To the compressed encoded video information by the data decoding means.
The processing-related information contained in the additional data
Generates and decodes child screen information by processing using
Video decoding means for small screens.
Digital television receiver. 8. Compression-encoded video information and its simplified information
Are in a hierarchical relationship, and the two
When called, the hierarchical information, the compression-encoded audio information, and the
For program information consisting of data, multiple
After multiplexing by stages, error correction coding means
After performing correction coding, the data is decoded by digital modulation means.
Digitally modulated and sent as a broadcast signal for one channel.
A television transmitter that signals, transmitted thereto is transmitted, receives the multi-channels of the broadcast signals from among the multi-channel, a channel selection means for selecting a first channel, and tunes 1 In addition to digital demodulation means for performing digital demodulation on a channel, and error correction decoding means for performing error correction decoding on one channel after digital demodulation, one bit after error correction decoding by the error correction decoding means is provided. A program selecting means for selecting a desired plurality of program information from a plurality of sets of program information constituting a channel; and a specific one of the plurality of program information selected by the program selecting means. A main screen video decoding means for decoding the compressed and coded video information in the hierarchical information to which it belongs as main screen information; A child screen video decoding means for decoding simplified information in the hierarchical information as child screen information, and after decoding the video, the obtained parent screen information is used as a parent screen, and the child screen information is used as a child screen, Image display means for displaying each on the same screen.
A digital television receiver, comprising: a digital television receiver.
system. 9. Compression-encoded video information and its simplification information
And hierarchical information but also to both me relationship near the hierarchical
When called, the hierarchical information, the compression-encoded audio information, and the
For program information consisting of data, multiple
After multiplexing by stages, error correction coding means
After performing correction coding, the data is decoded by digital modulation means.
Digitally modulated and sent as a broadcast signal for one channel.
A television transmitter. 10. A broadcast signal transmitted and transmitted.
Receives multiple channels and from among the multiple channels,
Channel selection means for selecting one channel, and
Digit for digital demodulation of channel
Digital demodulation means and one channel after digital demodulation.
Error correction decoding means for performing error correction decoding
In addition to preparing One channel after error correction decoding by the error correction decoding means
Any desired information from a plurality of sets of program information constituting a channel
Program selection means for selecting a plurality of pieces of program information;
From among the plurality of program information selected by the selection means.
Compressed code in hierarchical information belonging to one specific program information
Video decoding for parent screen that decodes the encoded video information as parent screen information
Signal means and the hierarchical information belonging to the remaining program information.
Video for sub-screen that decodes simplified information as sub-screen information
Decoding means for decoding the obtained parent screen information
The same screen as the screen
And image display means for displaying each of the images.
A digital television receiver characterized by the above-mentioned. 11. A broadcast signal transmitted and transmitted.
Receives multiple channels and from among the multiple channels,
Channel selection means for selecting one channel, and
Digit for digital demodulation of channel
Digital demodulation means and one channel after digital demodulation.
Error correction decoding means for performing error correction decoding
In addition to preparing One channel after error correction decoding by the error correction decoding means
Any desired information from a plurality of sets of program information constituting a channel
Program selection means for selecting a plurality of pieces of program information;
From among the plurality of program information selected by the selection means.
Compressed code in hierarchical information belonging to one specific program information
Video decoding for parent screen that decodes the encoded video information as parent screen information
Signal means and the hierarchical information belonging to the remaining program information.
Simplification Video for sub-screen that decodes information as sub-screen information
Digital means further comprising decoding means.
Television receiver.