JPH11252520A - Receiver, transmitter and broadcast system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a receiver to configure and display a channel introduction image pattern where a video image of each channel is displayed on a sub screen without distributing data separately. SOLUTION: A signal received by a demodulator 202 is demodulated and stored in a buffer 204 and outputted sequentially to a TSP extract section 206. In the case that a viewer selects a channel introduction menu, the TSP extract section 206 extracts only a stream of an I picture from a MPEG2-TS read from the buffer 204, an elementary stream generating section 206 restores it to an original elementary stream and an IVLC section 210, an inverse quantization section 212, an IDCT section 214 decodes the stream into original video data. Since the decoded data themselves are data realized as one picture, a multi-screen generating section 220 reduces the data and stores the reduced data to a prescribed address corresponding to a channel of a frame memory 218 to generate a multi-picture image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcasting system in which, for example, audio and video (AV) signals of a plurality of channels are multiplexed and transmitted. A multi-image screen in which images of a plurality of channels are arranged on a single screen, and a receiving apparatus and a multi-image screen on the receiving side that can appropriately select a channel using the multi-image screen The present invention relates to a transmitting apparatus that transmits signals of a plurality of channels so that the apparatus can be appropriately configured, and a broadcasting system that can efficiently broadcast AV signals of a plurality of channels by using the transmitting apparatus and the receiving apparatus.

[0002]

2. Description of the Related Art In recent years, digital multi-channel broadcasting by satellite broadcasting or terrestrial broadcasting has been started due to the progress of digital video processing technology and transmission technology, etc., and is becoming widespread. In digital multi-channel broadcasting, a channel for introducing a program is often provided so that a desired channel can be appropriately selected from a large number of channels. The channel for this program introduction has a screen of, for example, 9
It is composed of a multi-picture screen in which the image of each channel is reduced and displayed on each sub-screen by dividing the screen into 16 or 16 divisions. The user learns the contents and operates a receiving device or a remote controller to select a program to be viewed.

[0003] Conventionally, when providing such a multi-picture screen for program introduction, a broadcasting station creates this program introduction AV data, and as a signal of one channel, data of a normal program is used. And sent in the same way. FIG. 6 shows an example of a transmission device for transmitting a plurality of program data in such a form. In the transmitting apparatus 900 shown in FIG. 6 reproduces the program data (video data and audio data) of the material in the n-1 video tape recorder (VTR) apparatus 910 _-1 ~910 _-n-1, the encoder 930 _{- The} compression encoding is performed in _{1 to} 930- _n-1 . On the other hand, the program data of the material reproduced in the (n-1) VTR devices 910 _{-1 to} 910 _-n-1 is input to the video switcher 920 and reduced and combined to form one program data. The data is compressed and encoded by the encoder 930- _n in the same manner as the program data of the normal material. And
These n pieces of compression-encoded data are output to the multiplexer 94.
Multiplexed at 0, modulated for transmission by modulator 950, and distributed via satellite, for example, as radio waves.

[0004]

However, if the transmitting side generates and transmits multi-picture screen data for program introduction as described above, the transmission band for one channel is used for transmitting the multi-picture screen. Must be used, effectively reducing the number of programs that can be distributed by one channel. In other words, the data for one channel in the transmission data is data for this auxiliary program introduction channel, and is useless data in terms of actual program distribution.

In order to generate such a program introduction screen, it is necessary to perform processing such as switching, reduction, and synthesis of video data in a video switcher on the transmitting side. These processing procedures are set in advance. Must be kept. As a result, for example, an effective channel of a program, or a VTR for supplying a program to each channel
If the setting of the processing procedure for the video switcher is not properly changed, for example, when the device or the like changes dynamically, appropriate program introduction data may not be generated. That is, there is a possibility that, although actually distributed, it is not displayed on the multi-picture screen for program introduction, or a picture with invalid contents is displayed on the sub-screen of the multi-picture screen.

Accordingly, an object of the present invention is to provide a receiving apparatus capable of constructing a multi-picture screen in which data of a distributed program is appropriately displayed on a sub-screen, even if data for the multi-picture screen is not transmitted. Is to provide. It is another object of the present invention to provide a transmitting apparatus capable of transmitting program data so that such a multi-picture screen can be appropriately configured by the receiving apparatus. Still another object of the present invention is to display a multi-picture screen for channel introduction on a receiving device, in which data of a distributed program is appropriately displayed on a sub-screen without wasting a transmission band of data. It is an object of the present invention to provide such a broadcasting system.

[0007]

In order to solve the above-mentioned problems, a receiving apparatus according to the present invention comprises a receiving means for receiving transmitted signals of a plurality of channels, and a receiving means for receiving video signals of the plurality of channels. And a multi-picture signal generating means for generating a multi-picture screen signal in which a plurality of the extracted pictures are arranged. According to such a receiving device, each data of the plurality of channels distributed is received by the receiving unit, and a picture for forming a multi-picture screen for program introduction is extracted by the picture extracting unit from the received data, Using this, a desired multi-picture screen is formed in the multi-picture signal generation means.

The transmitting apparatus according to the present invention is a means for performing intra-frame coding or inter-frame predictive coding on each picture of each video signal of a plurality of channel signals. Encoding means for performing the encoding so that pictures at different times are encoded in the frame; multiplexing means for multiplexing the encoded signals of the plurality of channels; and Transmitting means for transmitting signals of a plurality of channels to a predetermined transmission path. According to such a transmission apparatus, in the encoding unit, in a picture that must be simultaneously processed in the same time zone during reproduction or the like between data of a plurality of channels, one of the Only pictures are intra-frame coded, and others are coded using inter-frame predictive coding. Therefore, an intra-coded picture that can be decoded only with the picture data is only one channel at each time, and using this as an index, pictures of each channel are sequentially and appropriately extracted. it can.

[0009] A broadcasting system according to the present invention is a broadcasting system having a transmitting device for transmitting signals of a plurality of channels and one or a plurality of receiving devices for receiving the transmitted signals. Is encoding means for encoding each picture of each video signal of the plurality of channels, wherein the encoding means performs the encoding so that pictures at different times are intra-coded in video signals of different channels. Multiplexing means for multiplexing the coded signals of the plurality of channels, and transmitting means for transmitting the multiplexed signals of the plurality of channels to a predetermined transmission path, A device configured to receive the signal transmitted via the transmission path, and the respective channels multiplexed on the signal by separating the received signal. Separating means for extracting a signal of the plurality of signals, picture extracting means for extracting the intra-coded picture from each of the separated video signals of the plurality of channels, and a plurality of pictures of the plurality of extracted signals are arranged. And a multi-picture signal generating means for generating a signal of the multi-picture screen.

In such a broadcasting system, each picture of each video signal of a plurality of channels is encoded by an encoding means such that pictures at different times are encoded in different frames on different channels. The signals of the respective channels are multiplexed by the multiplexing means, distributed via the transmitting means, the distributed signals are received by the receiving means in the receiving device, and the multiplexed signals are separated by the separating means and separated. A picture that has been intra-coded from each signal is extracted by a picture extraction unit, and a multi-picture screen is generated based on the pictures of a plurality of channels extracted by the multi-picture signal generation unit.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a broadcast system according to the present embodiment. As shown in FIG. 1, a broadcasting system 10 according to the present embodiment includes a transmitting apparatus 100 provided at a broadcasting station or the like for transmitting a signal of a program to be distributed, and a transmission path 300 for transmitting the transmitted signal. , Each of which has a receiving device 200 that receives a signal transmitted via the transmission path 300 and watches a desired program. In the present embodiment, the transmission path 300 is a transmission path via a satellite such as a broadcasting satellite or a communication satellite, that is, the broadcasting system 10 is a satellite broadcasting system.

First, the configuration of the transmitting apparatus 100 is shown in FIG.
This will be described with reference to FIG. FIG.
FIG. 3 is a block diagram showing a configuration of a 0. The transmitting device 100
n video tape recorder (VTR) devices 110 _-1 to
110 _-n , n encoders 120 _{-1 to} 120 _-n , an encoding control unit 130, a multiplexer 140 and a modulator 150.

The VTR devices 110 _{-1 to} 110 _-n are provided corresponding to the respective channels of the n-channel programs provided by the transmission device 100, and each reproduces the AV data of the broadcast material. The reproduced AV data is stored in the VTR device 110 _-i (i
= 1 to n)
It is output to 20 _{-1 to} 120 _-n .

Each of the encoders 120 _{-1 to} 120 _-n has a VT
The AV data reproduced and input by the R device 110 _-i (i = 1 to n) is MPEG2 encoded, and an MPEG2 transport stream (MPEG2-TS) is generated and output to the multiplexer 140. Then, at this time, in each of the encoders 120 _-i (i = 1 to n), the encoding control unit 13
Based on the control signal from 0, MPEG2 encoding is performed so that the picture position of an I (Intra coded) picture differs between different channels as described later.

In order to specifically explain the processing in the encoder 120- _i , first, the MPEG2
The encoding will be described. The encoder 120 _-i first performs analog / digital (A / D) conversion on the video data reproduced and input by the VTR device 110 _-i to convert the video data into a digital signal, and then performs MPEG2 encoding. To a predetermined spatial resolution. Then, for each picture, the picture type to be coded, ie, I
(Intra coded) picture, P (Predictive coded) picture, or B (Bidirectionally predictive coded) picture is determined, and the pictures are rearranged in the coding order based on the picture type.

Then, encoding is performed in the order of the rearranged pictures. That is, in the case of an I picture, the picture to be coded is DCT (Discrete Cosine T
In the case of a P picture or a B picture, motion compensated prediction and DCT (Discrete Cosine Transfo
rm), the obtained DCT coding coefficients are quantized, variable-length coded together with motion vectors and coding mode information, stored in a buffer, and stored in an MPEG2-TS
Generate

When performing such MPEG2 encoding,
In the encoders 120- _i , between different channels,
That is, the first to n-th encoders 120 _{-1 to} 120 _-n perform encoding such that I pictures are assigned to temporally different pictures.

A specific description will be given with reference to FIG. When performing the MPEG2 encoding as described above, a predetermined number of pictures are defined as GOPs (Group Of Pictures),
The encoding is performed so that one or more I pictures are included in the image. Specifically, as shown in FIG.
A picture is a GOP, and encoding is performed so that one I picture is included in the GOP. Encoder 120 _-1
Since -120- _n normally operate based on the same reference clock, the absolute time of the picture of each channel is the same, and the GOP delimiter may be the same. Figure 3 is a diagram illustrating a case such, as shown in the drawing, the Keep first channel, the first picture of GOP1 in the first encoder 120 _-1 is encoded as an I-picture The remaining 2nd to 15th pictures are encoded as P or B pictures.

[0019] In the second channel, the second encoder 120 _-2 fourth picture are encoded as an I-picture of GOP1, the first to third remaining
And the fifth to fifteenth pictures are encoded as P or B pictures. Similarly, in the third and fourth channels, the third encoder 120 ₃ and the fourth encoder 120 _-4, picture of the seventh and tenth GOP1 are encoded as I-pictures, the remaining Are encoded as P or B pictures. That is, for pictures at the same time, only one picture is
It is encoded as a picture.

In the fifth and subsequent channels, the position of the I picture is determined in this manner. In the encoders 120 _{-1 to} 120 _-n , the encoding control unit 1
Based on the control from 30, the coding type of each picture is determined in this way, and MPEG2 coding is performed.
Assuming that one GOP is composed of 15 pictures and one I-picture is included in one GOP, if the number of channels is up to 15, the I-pictures at exactly the same time
Although it can be configured so that the pictures do not overlap,
If the number of channels exceeds 15, I pictures will overlap between different channels. However, even in such a case, the order of the I pictures is managed so that the overlap of the I pictures with respect to the pictures at the same time is reduced as much as possible.

The encoding control unit 130 controls the encoding of the n encoders 120 _{-1 to} 120 _-n .
In particular, as described above, each encoder 120 _{-1 to} 120 _-n is instructed on the picture type to be encoded so that the number of I-pictures overlapping each time is reduced.

Multiplexer 140 includes encoders 120 _-1 to _120-1 .
MPEG-TS transport packets (TSPs) generated at 120- _n are multiplexed and distributed to MPEG-TS.
A TS is generated and output to modulator 150.

The modulator 150 modulates the MPEG2-TS for distribution, in which the AV data of a plurality of channels is multiplexed, which is input from the multiplexer 140, according to a predetermined method, and transmits the modulated MPEG2-TS to the transmission path. In the present embodiment, QPSK (Qua
(drature Phase Shift Keying)
Transmission is made to a broadcasting satellite via an antenna.

Next, the configuration of the receiving apparatus 200 will be described with reference to FIG.
This will be described with reference to FIG. The receiving device 200 includes a demodulator 202, a buffer 204, a TSP extraction unit 206, an elementary stream 208, an IVLC unit 210, an inverse quantization unit 212, an IDCT unit 214, an adder 216, a frame memory 218, a multi-screen generation unit 220, It has a changeover switch 222 and a channel selector 224.

The demodulator 202 receives and demodulates, for example, the signal transmitted from the transmitting apparatus 100 transmitted via the transmission path 300, and converts the signal to the original baseband MPEG2-TS.
Is reproduced and output to the buffer 204.

The buffer 204 sequentially stores the MPEG2-TS demodulated by the demodulator 202 and sequentially outputs the MPEG2-TS upon request.

The TSP extraction unit 206 reads out the MPEG2-TS packet from the buffer 204 as appropriate, selects only a desired packet based on a selection signal input from a channel selection unit 224 described later, and
Output to When a selection signal for selecting a program of a desired channel is input from the channel selection unit 224, the TSP extraction unit 206 refers to PID (Packet Identification) information of PEG2-TSP, and Only the channel stream is selected and output to elementary stream generation section 208. Also, TSP
When a selection signal for selecting an I picture is input from the channel selection unit 224, the extraction unit 206 extracts an I picture stream from the stream read from the buffer 204, and deletes the TS packet from the stream. Output to the mental stream generation unit 208. This I
The extraction of the picture stream is performed by referring to the picture type data of each TSP.

Elementary stream generator 208
Is T that is selected and input by the TSP extraction unit 206.
The SP is converted into an original elementary stream, that is, a video stream, an audio stream, and a private stream (user stream) added as necessary.

The IVLC unit 210 to the adder 216 are substantially MPEG2 decoders, and decode each elementary stream input from the elementary stream generation unit 208 to generate original video signals, audio signals, and the like. . Specifically, for example, the video signal is first subjected to variable length decoding in the IVLC section 210, and the coding mode, the motion vector, the quantization information, and the quantized DCT
Coefficients and the like are separated. Then, in the inverse quantization unit 212, the quantized DCT coefficient is converted into a DCT coefficient,
The CT unit 214 converts the DCT coefficients into pixel space data.

When a normal channel is selected and a series of video signals are decoded, the converted data is output to the adder 216, and the coding type is set to the motion compensation prediction. In the mode, the motion-compensated data is added to the reference picture data stored in the frame memory 218 by the adder 216 to generate an original picture, which is stored in the frame memory 218 and a switch. 222. If the data converted by the IDCT unit 214 is I-coded data, the adder 2
At 16, substantially no arithmetic processing is performed, and the generated data is stored in the frame memory 218 as it is and applied to the changeover switch 222.

In the channel selection section 224,
When the multi-picture screen, which is the channel introduction screen, is selected, as described above, the TSP extraction unit 20
In 6, the data of the I picture is selected, the picture is decoded in the elementary stream generation unit 208 IDCT unit 214, and the decoded data is output to the multi-screen generation unit 220.

The frame memory 218 is a memory capable of storing a plurality of pictures corresponding to the screen corresponding to a display device (not shown). When receiving a program of a normal channel, the frame memory 218 stores a reference picture or the like at the time of decoding. When a multi-picture screen for channel introduction is selected, the multi-picture screen configured by sequentially inputting the data of the sub-screen from the multi-screen generation unit 220 is stored.

The multi-screen generation unit 220 operates based on a control signal from the channel selection unit 224,
The picture of each channel output from the unit 214 is reduced to a predetermined size and stored in a predetermined area of the frame memory 218 according to the channel. This reduction rate is
It is determined by the number of sub-screens displayed simultaneously on one screen. In the present embodiment, the multi-screen generation unit 2
Reference numeral 20 denotes a multi-picture screen in which a reduced screen of 9 channels is displayed on one screen as shown in FIG. When the number of reception channels is larger than 9, a plurality of such multi-picture screens are created.

The multi-screen generation unit 220 will be described later with reference to an operation in which a viewer looks at a screen displayed on a display device (not shown) constituted by the multi-screen generation unit 220 and selects any one of the channels. When performed on the channel selection unit 224, the frame of the sub-screen of the channel selected by the viewer is emphasized based on the signal from the channel selection unit 224 as shown in FIG. An image is generated and recorded at that position in the frame memory 218.

The changeover switch 222 is connected to the receiving device 20
0, which is a switch for selecting a signal to be displayed on a display device (not shown).
It is switched by a selection switch input from the controller. When a program of a normal channel is selected, the channel selection unit 224 selects the terminal a and selects a signal decoded by the IVLC unit 210 to the adder 216. When a multi-picture screen for channel introduction is selected, the terminal b is selected, and the multi-picture screen configured in the frame memory 218 is selected.

The channel selection unit 224 receives an operation from a viewer using a remote controller (not shown) or the like, and based on the operation, the TSP extraction unit 206 and the multi-screen generation unit 22
0, each part of the receiving device 200 such as the changeover switch 222 is controlled. When the viewer selects any of the normal channels, the channel
The extraction unit 206 is instructed to select the TSP of the channel, the multi-screen generation unit 220 is instructed not to generate a multi-picture screen, and the switch 222 is set to the terminal a to select the terminal a. To switch to output the signal of the selected channel decoded by the adder 216.

When the viewer requests the provision of a screen for program introduction, it instructs the TSP extraction unit 206 to extract the I picture of each channel, and instructs the multi-screen generation unit 220 An instruction is issued to generate a multi-picture screen using the video signal output from the IDCT unit 214, and the switch 222 is set to the terminal b to generate the frame memory 218 generated by the multi-screen generation unit 220.
Is switched to select the program introduction screen stored in. At this time, if the viewer looks at this program introduction screen and performs an operation to specify that channel as a preparatory act to select any channel, the viewer selects The information of the channel to be output is output to the multi-screen generation unit 220, and the multi-screen generation unit 220 is instructed to perform a process of emphasizing the sub-screen of the channel.

Finally, the transmitting device 100 and the receiving device 2
00, that is, the operation of the broadcast system 10 will be described. First, in the transmitting device 100, the program data to be distributed is transmitted to the VTR device 110 corresponding to each channel.
_{-1 to} 110 _-n , and the MPEG
2 is coded and multiplexed by a multiplexer 140,
To the transmission path 300 via the. At this time, in each of the encoders 120 _-1 to encoder 120 _-n, pictures to be coded as an I picture not overlap at the same time, as much as possible uniformly distributed, the coding control unit 130 is the encoder 120 _{- 1 to} 120 _-n are managed and controlled.

Receiving apparatus 200 receiving such a signal
Demodulates the signal received by the demodulator 202 and
4 and sequentially output to the TSP extraction unit 206. When the viewer attempts to view a screen as shown in FIG. 5 in which the video of each channel is displayed on the sub-screen for channel selection, the viewer selects a channel via a remote controller or the like. Based on the signal to that effect input to section 224, TSP
A control signal for extracting an I picture from the received signal is output to the extracting unit 206.

The TSP extraction unit 206, based on this,
Only an I-picture stream is extracted from the MPEG2-TS sequentially read from the buffer 204 and output to the elementary stream generation unit 208. Then, the elementary stream generation unit 208 returns this to the original elementary stream, and outputs the IVLC units 210 to IDCT.
In the section 214, the original video data is restored. TS
Since all of the data selected by the P extraction unit 206 are I-picture data, the data of each picture output from the IDCT unit 214 is data that alone constitutes one picture. Therefore, the multi-screen generating unit 220 reads the data, reduces the data, and arranges the data at a predetermined position in the frame memory 218 corresponding to the channel of the picture.

Here, if the signal received by receiving apparatus 200 is transmitted from transmitting apparatus 100 described above, the I-pictures of each channel must be distributed at different times. For example, even if the processing system from the elementary stream generation unit 208 to the IDCT unit 214 has a processing performance capable of processing only one channel signal in real time, once per picture 1 GOP of each channel, that is, Normally, it is updated once a second. Further, even when there are a plurality of I pictures in pictures of different channels at the same time, the elementary stream generation unit 2
If the processing capability of the processing system of the 08 to IDCT unit 214 can perform processing on the plurality of pictures in real time, there is no problem. If these processing systems cannot perform such processing, the I-picture that could not be processed may be delayed or processed in some cases. Even if such processing is performed, if the purpose is to confirm the contents, the picture of each channel can be updated to the extent that the purpose can be sufficiently achieved, so there is no problem.

The multi-picture screen as shown in FIG. 5A stored in the frame memory 218 is selected by the changeover switch 222, output from the receiving device 200, and output to the display device. Is displayed. When the viewer performs an operation to specify any one of the channels via the remote controller or the like while the screen shown in FIG. 5A is displayed, the channel selection unit 224 displays The operation is accepted, and data indicating the designated channel number is input to the multi-screen generation unit 22.
Output to 0. The multi-screen generation unit 220 performs processing such as emphasizing the frame of the sub-screen of the channel based on the channel number, and reflects the result in the frame memory 218. As a result, a screen as shown in FIG. 5B is displayed on the display device.

When the viewer can confirm the channel to be selected by, for example, emphasizing the sub-screen of the multi-picture screen, the viewer performs an operation of selecting a program of the channel for execution. As a result, the channel selector 224 instructs the TSP extractor 206 to select the TSP of the channel, and the TSP extractor 20
No. 6 selects only the packet of the channel by referring to the PID of the TSP sequentially read out from the buffer 204.
The selected TSP is converted to an elementary stream in the elementary stream generation unit 208, decoded into the original signal in the IVLC unit 210 to the adder 216, output from the receiving device 200 via the changeover switch 222, Displayed on the display device.

As described above, the receiving apparatus 20 of the present embodiment
In 0, even if a screen for channel introduction is not distributed, a picture is appropriately extracted from a distributed program of each channel, and a screen for channel introduction of a multi-picture screen having a plurality of the pictures as sub-screens is automatically displayed. Can be generated dynamically. Therefore, the transmission band can be used for transmission of a substantial channel without using the transmission band for such a utility, in other words, the transmission band to be used can be used for transmission of a substantial channel. Multi-channel programs can be distributed.

According to transmitting apparatus 100 of the present embodiment, I-pictures to be extracted by receiving apparatus 200 are:
Since the program can be transmitted at the same time at each time, there is no need to provide a special decoding device in the receiving device 200, that is, without having a special buffer or the like,
In addition, even a decoding device having a performance capable of decoding one system of signals in real time can distribute a program so that a multi-picture screen as described above can be appropriately generated.

Note that the present invention is not limited to the present embodiment, and various suitable modifications are possible. For example, in the transmission device 100 described above, the means for providing the AV data of the material is all VTR devices, but when providing a live program such as a sports broadcast, for example,
Data transmitted from a stadium or the like may be used as is, or when a program recorded in a studio or the like is provided, output data from a control room related to the studio may be used as it is. That is, A of this material
The means for providing the V data is not limited to the VTR device, but may be any means used in a general broadcasting station or the like.

Also, in the transmitting apparatus 100 described above, the encoders 120 _{-1 to} 120 _-n operate with the same reference clock and perform coding with the same GOP configuration, and such a coding example is shown in FIG. It was shown to.
However, the operation of transmitting apparatus 100 is not limited to such a case. For example, the number of pictures constituting one GOP, the time zone of one GOP, and the like may be different for each channel. The transmitting device of the present invention aims to distribute pictures encoded as I-pictures at different times as much as possible in a plurality of video data of each channel. It is not limited to only a small number.

Further, the receiving apparatus of the present invention is intended to construct a multi-picture screen by extracting pictures coded as I-pictures from a plurality of video data of each channel, and to sequentially convert each sub-picture into an efficient picture. It is preferable to use the signal transmitted by the above-described transmission device according to the present invention in order to perform the update well, but this is not essential. Even for a signal in which an I-picture exists at the same timing in each channel, as many I-pictures as possible are decoded within the range permitted by the decoder performance, thereby updating the sub-picture of the multi-picture screen. Even in this case, there is no problem in the use of the multi-picture screen for selecting a channel, and there is no change in achieving and achieving the object of the present invention.

In this embodiment, only the processing of video data according to the present invention has been described. However, encoding, decoding, and reproduction of audio data and other additional data are performed by an arbitrary method. You may go. Specifically, MPEG2-Au of the same system as video
encoding may be performed by Dio, or Dolby AC3
Such a method may be used. Further, in the present embodiment, the present invention has been described by exemplifying broadcasting via a broadcasting satellite (BS). However, the present invention is applicable to CS broadcasting via a communication satellite (CS), terrestrial broadcasting, cable broadcasting, and the like. The present invention may be applied, and is not limited to the transmission path 300 at all.

[0050]

As described above, according to the present invention,
Even if data for a multi-picture screen is not transmitted, it is possible to provide a receiving apparatus capable of forming a multi-picture screen in which data of a distributed program is appropriately displayed on a sub-screen. In addition, it is possible to provide a transmission device that can transmit program data so that the reception device can appropriately configure such a multi-picture screen. Furthermore, a broadcasting system is provided in which a multi-picture screen for channel introduction, in which data of a distributed program is appropriately displayed on a sub-screen, is displayed on a receiving device without wasting data transmission bandwidth. can do.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a broadcast system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a transmission device illustrated in FIG.

FIG. 3 is a diagram illustrating an example of an encoded picture type of encoding of a video signal of each channel performed by an encoder of the transmission device illustrated in FIG. 2;

FIG. 4 is a block diagram illustrating a configuration of the receiving device illustrated in FIG. 1;

5 is a diagram for explaining a multi-picture screen configured by a multi-screen generation unit of the receiving device shown in FIG.

FIG. 6 is a block diagram showing a configuration of a conventional transmission device provided for digital multi-channel broadcasting.

[Explanation of symbols]

10 Broadcasting system, 100 Transmitting device, 110 VT
R device, 120: encoder, 130: encoding control unit,
140: multiplexer, 150: modulator, 200: receiving device, 202: demodulator, 204: buffer, 206: TSP
Extraction unit, 208 ... elementary stream, 210 ...
IVLC unit, 212: inverse quantization unit, 214: IDCT
Part, 216 ... adder, 218 ... frame memory, 220
... Multi-screen generation unit, 222 ... Changeover switch, 90
0: transmitting device, 910: VTR device, 920: video switcher, 930: encoder, 940: multiplexer, 9
50 ... Modulator

Claims (8)

[Claims] 1. A receiving means for receiving a signal including at least video signals of a plurality of channels to be transmitted, and extracting a predetermined picture from each of a plurality of arbitrary signals among the received video signals of the plurality of channels. And a multi-picture signal generating means for generating a multi-picture screen signal in which a plurality of the extracted pictures of the plurality of signals are arranged. 2. The video signal of the plurality of channels to be transmitted is a signal generated by performing intra-frame coding or inter-frame predictive coding on each picture of the video signal. 2. The receiving apparatus according to claim 1, wherein the intra-frame coded picture is extracted from each of the video signals of the channels. 3. The signal of the plurality of channels is a signal multiplexed and transmitted, and the receiving means includes a multiplexed signal for receiving the signal of the plurality of channels multiplexed and transmitted. 3. The receiving apparatus according to claim 2, comprising: receiving means; and separating means for separating the received multiplexed signal and extracting a signal for each channel. 4. The video signal of each of the plurality of channels to be transmitted is a signal encoded according to an MPEG2 system, and the receiving means performs MPEG2 decoding on the video signal separated by the separating means. 4. The receiving apparatus according to claim 3, further comprising an MPEG2 decoding unit, wherein the picture extraction unit extracts a picture encoded as an I (Intra coded) picture from each of the video signals of the plurality of channels. 5. A channel selecting means for selecting an arbitrary signal from the generated multi-picture screen signal or the received signals of the plurality of channels, and the generated multi-picture based on the selected signal. Display means for displaying a picture screen or the received video signals of the plurality of channels; and a selection channel for designating the channel to be displayed from the plurality of received channels based on the multi-picture screen displayed on the display means. The receiving device according to claim 3, further comprising a designation unit, wherein the channel selection unit selects a signal of the designated channel. 6. A means for intra-frame coding or inter-frame predictive coding of each picture of each of the input video signals of a plurality of channels each including at least a video signal by a predetermined coding method. Encoding means for performing the encoding so that pictures at different times are intra-coded in the video signals of the different channels; and multiplexing for multiplexing the encoded signals of the plurality of channels. A transmitting unit for transmitting the multiplexed signals of the plurality of channels to a predetermined transmission path. 7. The encoding means for encoding each picture of each video signal by an MPEG2 system, wherein pictures of different time are I (Intra coded) in video signals of different channels. 7. The transmitting apparatus according to claim 6, wherein encoding is performed so as to be encoded as a picture. 8. A broadcasting system comprising: a transmitting device for transmitting signals of a plurality of channels each including at least a video signal; and one or a plurality of receiving devices for receiving the signals transmitted by the transmitting device. The transmitting device is means for intra-frame encoding or inter-frame predictive encoding of each picture of each video signal of the plurality of channels by a predetermined encoding method. Encoding means for performing the encoding such that the picture is encoded in the frame; multiplexing means for multiplexing the encoded signals of the plurality of channels; and the multiplexed plurality of signals. Transmitting means for transmitting a signal of a channel to a predetermined transmission path, wherein the receiving apparatus receives the signal transmitted through the transmission path Receiving means for separating the received signal, and separating means for extracting a signal for each channel multiplexed with the signal, and the image of an arbitrary plurality of signals in the separated plurality of channels. A picture extraction unit for extracting the intra-coded picture from each of the signals; and a multi-picture signal generation unit for generating a multi-picture screen signal in which a plurality of the extracted pictures of the plurality of signals are arranged. Broadcast system to have.