JP2003087668A - Method and device for digital broadcast reception - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a digital broadcast receiver which makes it possible to speedily confirm the contents of a currently broadcasted program through zapping or multi-screen display. SOLUTION: While a viewer receives and views a desired digital broadcast, a 2nd tuner 11 receives a specified program sequence, a 2nd MPEG demultiplexer 12 extracts the video data of the specified program sequence of each transmission channel, and a 2nd MPEG video decoder 13 decodes the video data into a digital video signal, and the decoded digital video signal is stored as a program display screen signal in a 1st memory 14 by at least one screen, program by program, and the program display screen signal of a single program or of a plurality of programs stored in the 1st memory 14 is shown through multi-screen display.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention broadcasts a signal compressed by a digital compression method such as an MPEG method using a broadcasting satellite, a terrestrial wave, or a cable television (hereinafter referred to as CATV) using a cable. The present invention relates to a digital receiving method and a digital broadcast receiving device when receiving a digital broadcast.

[0002]

2. Description of the Related Art In recent years, digital broadcasting has been put into practical use, and for its digital compression, the MPEG2 system which has adopted interframe predictive coding has been adopted. A differential encoding technique is used for the inter-frame predictive encoding in the MPEG2 system. This differential encoding technique will be briefly described by taking a moving image as an example.

A moving image can be viewed as a set of temporally continuous still images. In fact, in a moving image in which there is a moving person in a certain landscape, the background does not change much between temporally adjacent still images (scenery as the background), and the person moves slightly. Often (that is, the temporal correlation is high).

Therefore, by utilizing this characteristic, it is possible to compress the image information as a whole by sending the information of the basic image and the difference information from it, which is a basic feature of the differential encoding technique. It is a way of thinking.

FIG. 12 is a diagram for explaining a bidirectional prediction method based on the MPEG2 frame structure.
3 is a diagram for explaining the structure of image data of the MPEG2 system.

The MPEG2 method is described in detail in, for example, the document "Latest MPEG Textbook" (edited by Hiroshi Fujiwara, edited by Multimedia Communication Research Group, ASCII Publishing Bureau). The ones shown in FIGS. 12 and 13 are a summary of the ones shown in P140 and P154 of the above-mentioned document.

In FIG. 12, the video signal is once converted from the field structure to the frame structure to obtain a screen from the first screen (first frame) to the third screen (third frame), and then the bidirectional The case of making a prediction is shown.

In this case, the first screen is used as a basic image, and the discrete cosine transform (DCT) is performed.
I frame (Intra Frame: intra-frame coded image) is generated by compression by. This I frame is an inverse DC
The first screen can be restored by performing the process of T.

Further, the difference between the first screen and the third screen is P
A frame (Predictive Frame: forward predictive coded image between frames), and an average value of a difference between the first screen and the second screen and a difference between the second screen and the third screen is a B frame (Bidirectionally predictive Frame). : Bidirectional predictive coded image).

That is, since the P frame and the B frame are difference information (difference information by interframe coding), the data amount is greatly reduced as compared with the case of performing intraframe coding.

When the video signal is restored from these I frame, P frame and B frame, the third screen is restored from the first screen and P frame, and the second screen is restored from the first screen, third screen and B frame. .

As described above, a method of compressing a moving image by forming compressed image data with the basic image data (I frame) and the differential data (P frame and B frame) between the basic image is differential encoding. (Referred to as moving image compression).

As shown in FIG. 13, a series of data compressed using moving picture compression includes a frame number, an image number,
A sequence header (SH: Sequence Header) consisting of data necessary for reproducing image data such as the number of pixels,
One I frame and a series of P and B frames generated on the basis of the I frame (GOP: Group
Of Picture).

Although not described in detail here, data compression processing is similarly performed on the audio signal by the MPEG2 audio system.

As described above, from the series of data consisting of the video signal and the audio signal processed by the MPEG2 system, 1
Transport stream (TS: Transp)
ortStream) is configured.

Then, an error correction code is added to this TS, and one transmission channel is composed of one to several channels of TS. This transmission channel is
It is digitally modulated and transmitted or broadcast. Hereinafter, a digital broadcast receiving apparatus for decoding a signal compressed by the MPEG2 method will be described.

FIG. 14 is a diagram showing an example of channel allocation for digital broadcasting. For example, currently used transmission channels in BS digital broadcasting include channels 1, 3, 13, and 15.

In FIG. 14, for example, a 1-channel A broadcasting station (consigned broadcasting company name is A company. Broadcasting channel is A channel (A-CH)) performs HDTV broadcasting (broadcasting with high definition image quality). In this case, one program can be broadcast. When the A broadcasting station performs SDTV broadcasting (broadcasting with normal image quality), it shows that it can broadcast three programs.

Similarly, a 3-channel G broadcasting station (the name of the consigned broadcasting company is G. The broadcasting channel is the G channel (G
-CH)), it is possible to broadcast one program for HDTV broadcasting and three programs for SDTV broadcasting.

FIG. 15 is a block diagram showing a conventional digital broadcast receiving apparatus. In the figure, 1 is a received signal input terminal for receiving a received signal, 2 is a first tuner module for receiving a received signal from the received signal input terminal 1,
Reference numeral 3 is a first MPEG demultiplexer which receives the output from the first tuner module 2 as an input.

Reference numeral 4 denotes a first MPEG video decoder which receives an output from the first MPEG demultiplexer 3 as an input.
Reference numeral 5 denotes an MPEG audio decoder which receives the output from the first MPEG demultiplexer 3 as an input.

Reference numeral 6 is a first D / A converter which receives the output from the first MPEG video decoder 4, 7 is a video signal output terminal which outputs an analog video signal, and 8 is MPE.
A second D whose input is the output from the G audio decoder
A / A converter, 9 is an audio signal output terminal for outputting an analog audio signal, and 10 is a receiver control means.

The signal processing operation in the conventional digital broadcast receiving apparatus will be described below. First, the received signal received by the antenna (not shown)
Is input to the tuner module 2.

The first tuner module 2 performs selection, demodulation, error correction, decoding, etc. of a transmission channel to be received, and a desired data stream from a TS in which a data stream for broadcast channels included in this transmission channel is multiplexed. Of the broadcast channel (for example, A channel, which is referred to as a reception channel here) is extracted and output to the first MPEG demultiplexer 3.

The first MPEG demultiplexer 3 is extracted from the program selection control signal generated by the receiving device control means 10 based on the program selection operation by the viewer and the TS of the receiving channel (here, A channel). Video data and audio data of a desired reception program (for example, program a1 included in A channel) is extracted from the TS of the reception channel (here, A channel) based on program specification information (PSI: Program Specific Information). And sends it to the first MPEG video decoder 4 and the MPEG audio decoder 5.

The first MPEG video decoder 4 decodes the digitally compressed video data to obtain a digital video signal. The digital video signal is converted into an analog video signal by the first D / A converter 6 and output from a video signal output terminal 7 to a display device (not shown) such as a CRT.

The MPEG audio decoder 5 decodes the digitally compressed audio data to obtain a digital audio signal. The digital audio signal is converted into an analog audio signal by the second D / A converter 8 and output from the audio signal output terminal 9 to an audio amplifier that drives a speaker or the like.

That is, the decoding of the video signal by the video signal decoding means composed of the first MPEG demultiplexer 3 and the first MPEG video decoder 4 is performed by the first MP.
The audio signal is decoded by the audio signal decoding means composed of the EG demultiplexer 3 and the MPEG audio decoder 5.

The receiving device control means 10 is, for example, a CPU
(Central Processing Unit) etc.,
It controls a series of processes related to the decoding of these video signals and audio signals. Also in the CATV, the digital signal received via the cable is subjected to the same processing as described above and output to the display device and the audio amplifier.

By the way, in the digital broadcast receiving apparatus using the MPEG2 system, the video signal cannot be decoded only from the difference information (P frame and B frame data). That is, for example, channel A1 (program a
When switching from 1) to B2 channel (program b2),
Decoding cannot be performed until the data of the I frame of the B2 channel can be received.

In order to solve this problem, the I-frame is usually updated and transmitted at every "appropriate time" (usually about every 0.5 seconds although there is no clear rule) on the broadcast station side. I'm doing that. However, it is still possible that the longest "appropriate time" minutes cannot be successfully decoded.

Therefore, in the conventional digital broadcasting receiver using the MPEG2 system, the contents of the program cannot be displayed unless the I frame is input every time the program is switched and displayed.

Japanese Patent Laid-Open No. 2000-101467 shows an example of a digital broadcast receiving terminal device having three tuners in order to quickly switch the channel (program) to be viewed (see FIG. 16). ).

In this example, one system tuner (capable of receiving one channel) is used for viewing at the present time, and the other two system tuners (capable of receiving two channels) are used for other channels. It is used for reception. That is, it is configured to be able to receive a plurality of channels.

However, if the channel (program) selected next to the channel selected at that time is not the channel predicted and received by the remaining two systems of tuners, the program is eventually switched and displayed. The program content cannot be displayed unless the I frame is input for each time, and the above-mentioned problem cannot be solved.

[0036]

As described above, in the conventional digital broadcast receiving apparatus, even if the viewer tries to check the contents of the program by switching the channels (programs) one after another (hereinafter referred to as zapping). However, there is a problem in that it is necessary to wait until an I frame is input each time each program is switched and displayed, and quick zapping cannot be performed.

The present invention has been made in order to solve the above-mentioned problems, and its main object is to provide a digital broadcast receiving apparatus capable of performing a quick zapping process when a viewer selects a program, Furthermore, a plurality of display screens of a series of program trains (hereinafter, referred to as a designated program train) made up of a program designated from among currently broadcast digital broadcast programs are displayed in one screen (hereinafter, It is an object of the present invention to provide a digital broadcast receiving method and device by which a program being simultaneously broadcast can be confirmed quickly by performing multi-screen display.

[0038]

According to a digital broadcast receiving method of the present invention, channels including a predetermined program are sequentially received from digital broadcast transmission channels, and a transport stream included in the received channel is used to receive the digital broadcast transmission channels. Digitally compressed video data corresponding to a predetermined program is extracted, the extracted video data is decoded to obtain a digital video signal, and the digital video signal is used as a program display screen signal of the designated program for each program. Storing at least one screen in the memory, selecting a desired program display screen signal from the program display screen signals stored in the memory, and outputting the selected program display screen signal to the image display means. It is characterized by including.

Further, it is characterized in that a plurality of program display screen signals stored in the memory are subjected to reduction processing and multi-screen display.

Further, it is characterized in that a transmission channel including a plurality of designated program trains is received at regular intervals.

Further, after receiving one program out of a plurality of designated program trains and storing the display screen signal of the program in the memory, reception of the program to be received next and a series of program display screen signals are received. It is characterized by storing.

The digital broadcast receiving method according to the present invention sequentially receives channels including a predetermined program from digital broadcast transmission channels, and performs digital compression corresponding to the predetermined program from a transport stream included in the channel. The extracted video data is extracted, and the data of the sequence header part in which the decoding control information included in the extracted video data is stored is replaced with the data indicating that the decoding can be performed only with the intra-frame coded image data of one screen. Program display screen data including the replaced data of the sequence header part and the intra-frame encoded image data is stored in a memory for each screen one by one, and a desired program display screen data is selected from the memory. It is characterized by including decoding a digital video signal.

Further, the program display screen signal obtained by sequentially decoding the program display screen data stored in the memory is reduced, and the reduced program display screen signal is stored in the memory as a multi-screen signal for screen division display. It is characterized by displaying multiple screens while memorizing.

Further, it is characterized in that a transmission channel including a plurality of designated program trains is received at regular intervals.

Further, after receiving one program of a plurality of designated program trains and storing the display screen signal of the program in the memory, reception of the program to be received next and a series of program display screen data are received. It is characterized by storing.

A digital broadcast receiving apparatus according to the present invention includes a tuner module for sequentially receiving channels including a predetermined program from digital broadcast transmission channels and obtaining a transport stream including digitally compressed video data, A demultiplexer for extracting digitally compressed video data corresponding to the predetermined program from the transport stream, a video decoder for decoding the video data to obtain a digital video signal, and the digital video signal for the predetermined video signal. First at least one screen is stored for each program as a program display screen signal corresponding to the program
Memory control of the program display screen signal to the first memory, and output control of a desired program display screen signal from the program display screen signals stored in the first memory. Memory control means and the tuner
A module, the demultiplexer, the video decoder, and a receiver control means for controlling the memory control means.

Further, the memory control means is characterized in that the plurality of program display screen signals stored in the first memory are subjected to reduction processing so as to be capable of multi-screen display.

Further, the receiving device control means successively receives the transmission channels including a plurality of designated program trains at regular intervals by the tuner module, and the display screen signal of the designated program is stored in the first memory. It is characterized in that it is controlled so as to store one screen at a time.

In addition, the receiving device control means receives a program from the plurality of designated program trains by the tuner module, and stores the display screen signal of the program in the first memory one screen at a time. After the storage operation is completed, control is performed such that reception of a program to be received next and storage operation of a series of program display screen signals are performed.

A digital broadcast receiving apparatus according to the present invention includes a tuner module for sequentially receiving channels including a predetermined program from digital broadcast transmission channels to obtain a transport stream including digitally compressed video data, A demultiplexer for extracting digitally compressed video data corresponding to the predetermined program from the transport stream, and data of a sequence header part storing decoding control information included in the video data in one frame A sequence header replacement circuit that replaces data that can be decoded only with the intra-coded image data, and program display screen data including the data of the replaced sequence header part and the intra-frame coded image data is set to 1 for each program. A second memory for storing each screen, and the second memory Memory control means for selecting a desired program display screen data from the memory, a video decoder for decoding a digital video signal from the desired program display screen data, the tuner module, the demultiplexer, a sequence header replacement circuit, And a receiver control means for controlling the memory control means and the video decoder.

Also, memory control means for controlling the sequential reading of the program display screen data stored in the second memory, and a digital video signal from the read program display screen data to decode the program display screen signal. A video decoder for outputting, a third memory for storing a plurality of the program display screen signals as a multi-screen signal for screen division display, and a control for reducing the plurality of program display screen signals and storing them in the third memory And a memory control means for performing.

Further, the receiver control means causes the tuner module to sequentially receive the transmission channels including the plurality of designated program sequences at regular intervals, and the display screen data of the designated program is stored in the second memory. It is characterized in that it is controlled so as to store one screen at a time.

Further, the receiving device control means receives a program from the plurality of designated program trains by the tuner module, and stores the display screen data of the program in the second memory one screen at a time. After the storage operation is completed, control is performed such that reception of a program to be received next and storage operation of a series of program display screen data are performed.

[0054]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. The present invention will be specifically described based on the drawings showing the embodiments thereof. Figure 1
FIG. 1 is a block diagram of a digital broadcast receiving apparatus that is Embodiment 1 of the present invention. In FIG. 1, 1 is a received signal input terminal, 2 is a first tuner module, 3 is a first MPEG demultiplexer, 4 is a first MPEG video decoder, and 5 is an MPEG audio decoder.

Reference numeral 16 denotes a first switch circuit which receives an output from the first MPEG video decoder 4 and an output from a first memory 14 which will be described later, and 6 inputs an output from the first switch circuit 16. The first D / A converter,
Reference numeral 7 is a video signal output terminal, and 8 is a second D / A converter which receives an output from the MPEG audio decoder.

Reference numeral 9 is an audio signal output terminal, 10 is a receiver control means, 11 is a second tuner module which receives the reception signal from the reception signal input terminal 1, and 12 is an output of the second tuner module 11. Second MP with input
An EG demultiplexer 13 is a second MPEG video decoder which receives the output of the second MPEG demultiplexer 12 as an input.

Reference numeral 14 is a second MPEG video decoder 13
Reference numeral 15 is a first memory that receives an output from the first memory, and 15 is a first memory controller that controls the first memory 14.
In the following, duplicated description of the same components as those in FIG. 15 will be omitted.

The operation will be described below. A reception signal received by an antenna (not shown) is input from the reception signal input terminal 1 to the first tuner module 2 and the second tuner module 11.

The first tuner module 2 performs reception channel selection, demodulation, error correction, decoding, etc., extracts the TS in which the TS for each program is multiplexed, and extracts the first MPE.
Output to the G demultiplexer 3.

The first MPEG demultiplexer 3 digitally compresses video data and audio of a desired program from the multiplexed TS based on the program selection control signal by the viewer's tuning operation and the PSI of the receiving channel. Data and extracts the first MPEG video decoder 4 and MPEG
It is sent to the audio decoder 5.

The first MPEG video decoder 4 decodes the digitally compressed video data and outputs a digital video signal to the first switch circuit 16. First MP
The digital video signal output from the EG video decoder 4 is input to the first D / A converter 6 via the first switch circuit 16, converted into an analog video signal, and output from the video signal output terminal 7. .

The MPEG audio decoder 5 decodes the digitally compressed audio data and outputs a digital audio signal to the second D / A converter 8. The digital audio signal is converted into an analog audio signal by the second D / A converter 8 and output from the audio signal output terminal 9.

FIGS. 2 and 3 show a digital video signal for one screen of a designated program by switching between a transmission channel to be received and a channel to be received (an I picture for one screen in the MPEG system. FIG. 3 is a flowchart showing a procedure for storing a signal (referred to as a signal) in the first memory 14 shown in FIG. 1.

Next, the operation of receiving, decoding, and storing the program display screen signal in the memory will be described with reference to FIGS.

In FIG. 4, the viewer changes channels A1, A3, B1, B2, B3 (programs a1, a3, b1, b2, b3) from one of the transmission channels, and
7 shows an example of a transmission channel number table and a channel number table when H1 and H3 channels (programs h1 and h3) are designated from the three transmission channels.

In the receiver control means 10, the transmission channel number N is first reset (S102), and the second
In the tuner module 11 of No. 1, one channel (corresponding to the transmission channel number N = 0) is selected from the transmission channel number table shown in FIG.

A timer for circulating each transmission channel at fixed time intervals is started (S103), and the broadcast of one channel is received and digitally demodulated.
Further, error correction and decoding are performed, and a TS in which the TS for each channel (program) is multiplexed is extracted (S104), and PSI is set.
Is acquired (S105).

Then, the channel number NP is reset (when the channel number NP = 0, the A1 channel (program a
1) is associated. (S106).

That is, at this point, the A1 channel corresponding to the channel number NP = 0, that is, the program a1 is selected from the channel number table shown in FIG. 4B. As shown in FIG. 4B, five channels A1, A3, B1, B2 and B3 are designated from one channel of the transmission channels corresponding to the transmission channel number N = 0. Maximum number N
Pmax = 4.

In the second MPEG demultiplexer 12, a signal indicating selection of the A1 channel obtained from the channel number NP = 0 (A1 channel selection signal. Hereinafter, regarding signals indicating selection of A3, B1 ... Based on PSI and T
The video data of the digitally compressed program a1 is extracted from S.

The video data of the extracted program a1 is the second video data.
Is decoded by the MPEG video decoder 13 and the digital video signal of the program a1 is output (S107), and stored in the first memory 14 as the program display screen signal of the program a1 (S108).

Since NP = 0 and NPmax = 4 (hence NO in S109), 1 is added to the channel number NP at that time, and the result is newly set as the channel number NP (S110).

If no timeout has occurred (hence NO in S112), the second MPEG demultiplexer 12 digitally compresses the TS based on the A3 channel selection signal obtained by the channel number NP = 1 and the PSI. The video data of the running program a3 is extracted.

The video data is decoded by the second MPEG video decoder 13, the program display screen signal of the program a3 is output (S107), and stored in the first memory 14 (S108).

Similarly, the programs b1 and b2 are received, decoded, and stored in the memory, and then the program display screen signal of the program b3 is output (S107).
Is stored in the memory 14 (S108).

At this point, the channel number NP = 4 (therefore, YES in S109), the channel number NP is reset (NP = 0) (S11).
1).

Here, when the timeout has not occurred (hence NO in S112), the A1 channel (NP = 0) is selected again, and the program display screen signal of the program a1 is output from the second MPEG demultiplexer 12. It is output (S107) and stored in the first memory 14 (S10).
8).

As described above, as long as the timeout does not occur, the programs a1, a3, b for which the channel 1 is designated are
The program display screen signals of 1, b2 and b3 are sequentially set to the first
Stored in the memory 14.

When a timeout occurs (according to S
(YES in 112), the transmission channel number N = 0 is compared with the maximum value Nmax = 1 of the transmission channel number (hence NO in S113), 1 is added to the transmission channel number N up to that point, and a new transmission channel number is obtained. N = 1
(S114).

Then, the timer is restarted (S
At the same time, the broadcast of 3 channels is received as a transmission channel by the transmission channel number N = 1 and is digitally demodulated. Further, error correction and decoding are performed, and a TS in which the TS of each program is multiplexed is extracted (S104),
The PSI is acquired (S105).

Thereafter, the program display screen signals of the h1 program and the h2 program are sequentially stored in the first memory 14 by the same operation as the reception of one channel of the above-mentioned transmission channel.

Next, if a time-out occurs (thus, YES in S112), the transmission channel number N =
1 is compared with the maximum value Nmax = 1 of the transmission channel number (thus, YES in S113), the transmission channel number N is reset (N = 0) (S102), and the reception of one channel of the transmission channel is started again. It After that, the channel selection operation described above is repeated, and the program display screen signals stored in the first memory 14 are sequentially updated.

FIG. 5 is a diagram showing an example of storage of the program display screen signal in the first memory 14, and FIG.
As shown in (a), the program display screen signals of the programs a1 to h3 are stored corresponding to the frame numbers in the first memory 14.

FIG. 5B shows that the program display screen signal stored in the first memory 14 for displaying the list of programs is reduced by, for example, 1/3 thinning in the horizontal and vertical directions. , A case of obtaining a digital video signal (hereinafter referred to as a multi-screen signal) to be displayed in 9-screen division.

As described above, the receiving channel is switched at a constant time interval (eventually, it is equivalent to switching programs. Therefore, the sequence of programs (program sequence) received by the switching operation is changed. (It can be considered), it operates so as to go through a specified program sequence from the currently broadcast digital broadcasting, and the program display screen signals of the specified program are sequentially stored in the first memory 14. It

Further, as shown in FIG. 3, except for the time-out detection step (function) from FIG. 2, the switching of the reception channel of the second tuner module 11 is performed in the first memory 14 not at a fixed time interval. Immediately after the series of storage operations for storing the program display screen signal of the designated program sequence is completed, the receiving channel to be received next is immediately switched to, thereby shortening the operation time for going around the designated program. .

FIG. 6 is a flow chart showing a procedure for taking out the program display screen signal stored in the first memory 14 and performing zapping or multi-screen display. In FIG. 1, the first memory controller 15 has a second MP
Control is performed to store the digital video signal output from the EG video decoder 13 in the first memory 14 as a program display screen signal for each screen for each program.

When there is no request for program search display such as zapping or multi-screen display (hence NO in S202)
Is output from the first MPEG video decoder 4,
The video data of the program currently being viewed is selected by the switch circuit 16 (S203).

When the viewer desires zapping (thus, YES in S202 and NO in S204), the program display screen signal of the designated program is set to 1 from the first memory 14 every time the viewer designates a program. Read and output screen by screen.

When the viewer desires multi-screen display (hence, YES in S204), the first memory 1
The program display screen signal of the program sequence designated from 4 is controlled by the first memory controller 15 and sequentially read out into each area divided into reduced screens in one display screen as shown in FIG. 5B. Can be displayed on a multi-screen. An example of this multi-screen display screen is shown in FIG.

When the viewer desires zapping or multi-screen display, the output of the first memory 14 is selected by the first switch circuit 16. As a result, the first digital video signal of zapping or multi-screen display is output to the D / A converter 6, converted into an analog video signal, and output from the video signal output terminal 7 to a display device or the like. The receiving device control means 10 controls these series of processes.

As described above, while the viewer is receiving and watching the desired digital broadcast, the designated program sequence is received in parallel, and one screen is displayed for each received program. Memorize the signal.

Therefore, when the viewer performs the zapping, it is possible to select and display the program display screen signal of the desired program from the stored program display screen signals, and the quick zapping process can be performed.

Furthermore, when the viewer desires to display a list of programs (multi-screen display), the stored program display screen signal can be confirmed by the multi-screen display.

When the viewer selects a desired program while referring to zapping or multi-screen display,
At the time point when the video data compressed by the first MPEG demultiplexer 3 and the first MPEG video decoder 4 is decoded from the video data received by the tuner module 2 to obtain a digital video signal, The first switch circuit 16 is automatically switched from the output side of the first memory 14 to the output side of the first MPEG video decoder 4. As a result, a smooth program selection operation can be realized.

Embodiment 2. FIG. 8 shows a digital broadcast receiving apparatus which is Embodiment 2 of the present invention.
In the figure, 1 is a received signal input terminal, 2 is a first tuner module, 3 is a first MPEG demultiplexer, and 4 is a first MPEG video decoder which receives an output from a second switch circuit 20 as an input. is there.

Reference numeral 5 is an MPEG audio decoder, 6 is a first D / A converter, 7 is a video signal output terminal, 8 is a second D / A converter, 9 is an audio signal output terminal, 10 is a receiver control means, Reference numeral 11 is a second tuner module, and 12 is a second MPEG demultiplexer.

Reference numeral 16 is a first switch circuit which receives the output from the first MPEG video decoder 4 and the output from a third memory 21 which will be described later, and 17 receives the output from the second MPEG demultiplexer 12. Is a sequence header replacement circuit.

Reference numeral 18 is a second memory that receives the output from the sequence header replacement circuit 17, 19 is a second memory controller that controls the second memory 18, and 20 is an output from the first MPEG demultiplexer 3. And the second
The second switch circuit receives the output from the memory 18 of FIG.

Reference numeral 21 is a third memory that receives the output from the first MPEG video decoder 4, and reference numeral 22 is a third memory controller that controls the third memory 21. Note that duplicate description of the same components as in FIG. 1 is omitted.

FIGS. 9 and 10 show a set of data (hereinafter referred to as program display screen data) consisting of SH and I frame data of a designated program by switching the receiving transmission channel and the receiving channel. FIG. 11 is a flow chart showing a procedure of storing in the second memory, and FIG. 11 is a flow chart showing a procedure of performing zapping or multi-screen display by the program display screen data stored in the second memory.

In FIG. 8 and FIG. 9, the second tuner module 11 switches the transmission channel to be received and the channel to be received, performs demodulation, error correction, decoding and the like, and supports the program of the designated program sequence. From the TS corresponding to the program sequence multiplexed according to each program of the program sequence (S104), and the second MPEG
Output to the demultiplexer 12.

The second MPEG demultiplexer 12 is
PSI is acquired (S105), and T corresponding to the program sequence is acquired.
From S, only the video data obtained by selectively extracting the TS corresponding to the designated program is sequentially extracted (S120) and output to the sequence header replacement circuit 17.

The sequence header replacement circuit 17 can decode the data of the sequence header part with the data of only the I frame (specifically, P frame, B frame).
The information on the frame has been deleted) (S121), and the I-frame data is extracted (S12).
2) Secondly, the replaced sequence header data and I frame data are used as program display screen data.
It is stored in the memory 18 (S123).

As shown in FIG. 10, the time-out detection function is removed from FIG. 9, and the reception channel of the second tuner module 11 is switched at a fixed time interval instead of a fixed time interval.
By immediately switching to the receiving channel to be received next after the series of storage operations for storing the program display screen data of the designated program sequence in the second memory 18,
It is possible to shorten the operation time for going around the designated program.

In FIG. 8 and FIG. 11, the second memory 18 stores the program display screen data for each screen for each program, and at the same time when the viewer desires the zapping process (therefore, in S202, YES, N in S204
O), the second memory 18 by the second switch circuit 20.
Output is selected.

Subsequently, the program display screen data stored in the second memory 18 is read for the program designated by the viewer by zapping (S210), and the first MP is displayed.
The program display signal is decoded by the EG decoder 4 (S2
11), via the first switch circuit 16 (S21
2), converted into an analog video signal in the first D / A converter 6 and output from the video signal output terminal 7.

When a multi-screen display capable of listing programs is desired (hence, YES in S204), the program display screen data of each program is retrieved from the designated program sequence stored in the second memory 18. Sequentially read (S2
13), the program display screen signal is decoded by the first MPEG decoder 4 (S214).

Further, the multi-screen signal for screen division display is reduced in the third memory 21 and sequentially stored (S215). Next, the output of the third memory is selected by the first switch circuit 16 (S216), and the multi-screen signal is converted into an analog video signal by the first D / A converter 6 and output from the video signal output terminal 7. It

As described above, since the zapping process is performed using the program display screen data stored in the second memory 18, it is sufficient to have only one MPEG video decoder, and The program display screen data can be decoded by decoding only one frame of I frame for each program, so that zapping can be performed in an extremely short time.

Further, the program display screen data stored in the second memory 18 can be sequentially decoded, and stored in the third memory 21 as a multi-screen signal to perform multi-screen display.

The second memory controller 19 is
A series of controls regarding storage and reading of the second memory 18 are performed. In addition, the third memory controller 22 is
A series of control regarding storage and reading of the memory 21 is performed. Then, the receiver control means 10 controls the series of processes described above.

As described above, while the viewer is receiving and watching the desired digital broadcast, the designated program sequence is received in parallel, and one screen is displayed for each received program. The operation of storing as data is repeated (paid).

Therefore, when the viewer performs zapping, the stored program display screen data of the desired program is decoded and displayed one screen at a time, so that quick zapping processing can be performed.

Further, when the viewer desires to display a list of programs (multi-screen display), the stored program display screen data of the designated program is sequentially decoded, and the third memory 2
Since the program display screen signal is stored so as to be fitted into each area divided into 1, the programs can be listed by the multi-screen display, which enables quick confirmation.

Incidentally, the first and second embodiments.
In the second MPEG demultiplexer 12, the second
Although the video decoder 13 is described as a circuit block, it can be realized by software.

The second MPEG demultiplexer 1
2. The decoding process corresponding to the circuit block of the second video decoder 13 does not necessarily have to be performed in real time, and the same result can be obtained even with a delay.

[0118]

Since the present invention is constructed as described above, it has the following effects.

The digital broadcast receiving method according to the present invention sequentially receives channels including a predetermined program from the digital broadcast transmission channels, and corresponds to the predetermined program from the transport stream included in the received channel. Digitally compressed video data is extracted, the extracted video data is decoded to obtain a digital video signal, and the digital video signal is used as a program display screen signal of the designated program for at least one screen for each program. Storing the program in the memory, selecting a desired program display screen signal from the program display screen signals stored in the memory, and outputting the selected program display screen signal to the image display means. Therefore, there is an effect that a quick zapping process can be performed.

Further, since it is characterized in that a plurality of program display screen signals stored in the memory are subjected to reduction processing and multi-screen display, when the viewer desires, for example, the program display screens are grouped by 9 programs at a time. Since multiple screens can be displayed on the screen, it is possible to display a list of programs and quickly select programs.

Further, since the transmission channel including a plurality of designated program trains is received at regular intervals, the display screen of the designated program stored in the first memory is a newer screen. Therefore, as a result, there is an effect that a more recent received program can perform a quick zapping process or a multi-screen display.

Further, after receiving one program of a plurality of designated program trains and storing the display screen signal of the program in the memory, reception of the program to be received next and a series of program display screen signals are received. Since it is characterized by storing, it is possible to reduce the time required to go around a specified program, and as a result, the latest received program can be quickly processed by zapping,
Alternatively, there is an effect that multi-screen display can be performed.

The digital broadcast receiving method according to the present invention sequentially receives channels including a predetermined program from digital broadcast transmission channels, and performs digital compression corresponding to the predetermined program from a transport stream included in the channel. The extracted video data is extracted, and the data of the sequence header part in which the decoding control information included in the extracted video data is stored is replaced with the data indicating that the decoding can be performed only with the intra-frame coded image data of one screen. Program display screen data including the replaced data of the sequence header part and the intra-frame encoded image data is stored in a memory for each screen one by one, and a desired program display screen data is selected from the memory. Since it is characterized by including decoding a digital video signal,
There is an effect that a quick zapping process can be performed and the configuration is simple.

Further, the program display screen signal obtained by sequentially decoding the program display screen data stored in the memory is reduced, and the reduced program display screen signal is stored in the memory as a multi-screen signal for screen division display. Since the multi-screen display is performed while storing, there is an effect that the program list can be confirmed only by reading the multi-displayed screen stored in the memory.

Further, since the transmission channel including a plurality of designated program trains is received at regular intervals, the display screen of the designated program stored in the first memory is a newer screen. Therefore, as a result, there is an effect that a more recent received program can perform a quick zapping process or a multi-screen display.

Further, after receiving one program of a plurality of designated program trains and storing the display screen signal of the program in the memory, reception of the program to be received next and a series of program display screen data are received. Since it is characterized by storing, it is possible to shorten the time required to go around a specified program,
As a result, there is an effect that a more recent received program can perform a quick zapping process or a multi-screen display.

A digital broadcast receiving apparatus according to the present invention includes a tuner module for sequentially receiving channels including a predetermined program from digital broadcast transmission channels and obtaining a transport stream including digitally compressed video data, A demultiplexer for extracting digitally compressed video data corresponding to the predetermined program from the transport stream, a video decoder for decoding the video data to obtain a digital video signal, and the digital video signal for the predetermined video signal. First at least one screen is stored for each program as a program display screen signal corresponding to the program
Memory control of the program display screen signal to the first memory, and output control of a desired program display screen signal from the program display screen signals stored in the first memory. Memory control means and the tuner
Since the module, the demultiplexer, the video decoder, and the receiver control means for controlling the memory control means are provided, there is an effect that a quick zapping process can be performed.

Further, since the memory control means performs a reduction process for a plurality of program display screen signals stored in the first memory so that multi-screen display can be performed, when the viewer desires, for example, the above-mentioned Since the program display screens can be collectively displayed on a multi-screen basis for nine programs, there is an effect that a list of programs and a quick program selection can be performed.

Further, the receiver control means causes the tuner module to sequentially receive the transmission channels including a plurality of designated program sequences at regular intervals, and the display screen signal of the designated program is stored in the first memory. Since the display screen of the designated program stored in the first memory becomes a newer screen because it is controlled so that it is stored one screen at a time, as a result, the latest received program is quickly zapped. There is an effect that processing or multi-screen display can be performed.

Further, the receiving device control means receives a program of the plurality of designated program trains by the tuner module and stores the display screen signal of the program in the first memory one screen at a time. After the storage operation is completed, the control is performed so that the next program to be received and the series of program display screen signal storage operations are performed, so the time required to go around the specified program is shortened. As a result, there is an effect that a more recent received program can perform a quick zapping process or a multi-screen display.

A digital broadcast receiving apparatus according to the present invention includes a tuner module for sequentially receiving channels including a predetermined program from digital broadcast transmission channels and obtaining a transport stream including digitally compressed video data, A demultiplexer for extracting digitally compressed video data corresponding to the predetermined program from the transport stream, and data of a sequence header part storing decoding control information included in the video data in one frame A sequence header replacement circuit that replaces data that can be decoded only with the intra-encoded image data, and program display screen data including the data of the replaced sequence header part and the intra-frame encoded image data is set to 1 for each program. A second memory for storing each screen, and the second memory Memory control means for selecting desired program display screen data from the memory, a video decoder for decoding a digital video signal from the desired program display screen data, the tuner module, the demultiplexer, a sequence header replacement circuit, Since the memory control means and the receiving device control means for controlling the video decoder are provided, there is an effect that a quick zapping process can be performed and the configuration is simplified.

Also, memory control means for controlling the sequential reading of the program display screen data stored in the second memory, and a digital video signal from the read program display screen data to decode the program display screen signal. A video decoder for outputting, a third memory for storing a plurality of the program display screen signals as a multi-screen signal for screen division display, and a control for reducing the plurality of program display screen signals and storing them in the third memory Since it is provided with a memory control means for performing the above, there is an effect that the program list can be confirmed only by reading the multi-displayed screens stored in the memory.

Further, the receiving device control means causes the tuner module to sequentially receive the transmission channels including the plurality of designated program sequences at regular intervals, and the display screen data of the designated program is stored in the second memory. Since the control is performed so that each screen is stored one by one, as a result, there is an effect that a more recent received program can perform a quick zapping process or multi-screen display.

Further, the receiving device control means receives a program from the plurality of designated program trains by the tuner module and stores the display screen data of the program in the second memory one screen at a time. After the storage operation is completed, control is performed so as to perform reception of the program to be received next and storage operation of a series of program display screen data. Therefore, the program specified in the first memory is stored. Since the display screen becomes a newer screen, as a result, there is an effect that a more recent received program can perform a quick zapping process or a multi-screen display.

[Brief description of drawings]

FIG. 1 is a block diagram showing a digital broadcast receiving apparatus according to a first embodiment.

FIG. 2 is a flowchart illustrating an operation procedure of the first embodiment.

FIG. 3 is a flowchart illustrating another operation procedure of the first embodiment.

FIG. 4 is an explanatory diagram showing an example of a digital broadcast transmission channel number table and a channel number table.

FIG. 5 is an explanatory diagram showing an example of storing a program display screen signal in a memory according to the first embodiment.

FIG. 6 is a flow diagram illustrating an operation procedure of zapping and multi-screen display according to the first embodiment.

FIG. 7 is an explanatory diagram showing a multi-displayed screen according to the first embodiment.

FIG. 8 is a block diagram showing a digital broadcast receiving device according to a second embodiment.

FIG. 9 is a flowchart illustrating an operation procedure according to the second embodiment.

FIG. 10 is a flowchart illustrating another operation procedure of the second embodiment.

FIG. 11 is a flowchart showing an operation procedure of zapping and multi-screen display in the second embodiment.

FIG. 12 is an explanatory diagram for explaining bidirectional prediction according to the MPEG2 method.

FIG. 13 is an explanatory diagram for explaining the structure of image data of the MPEG2 system.

FIG. 14 is an explanatory diagram showing an example of channel allocation for digital broadcasting.

FIG. 15 is a diagram showing a conventional digital broadcast receiving apparatus.

FIG. 16 is a diagram showing another conventional digital broadcast receiving apparatus.

[Explanation of symbols]

1 input terminal, 2 first tuner module, 3
First MPEG demultiplexer, 4 first MPEG
Video decoder, 5 MPEG audio decoder, 6
1st D / A converter, 7 output terminals, 8 2nd D / A converter, 9 output terminals, 10 receiving device control means, 11 2nd tuner module, 12 2nd
MPEG demultiplexer, 13 2nd MPEG video decoder, 14 1st memory, 15 1st memory controller, 16 1st switch circuit, 17 sequence header replacement circuit, 18 2nd memory, 19
Second memory controller, 20 Second switch circuit, 21 Third memory, 22 Third memory controller.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Miyo Watanabe             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Kosuke Yagi             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Takayuki Kushida             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Tenryu Misawa             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5C025 AA23 CA01 CB05 DA01                 5C059 MA00 MA05 MA14 MA23 MC11                       MC38 ME01 PP05 PP06 PP07                       RB10 RC11 SS02 UA05                 5C063 AB03 EB38 EB42

Claims (16)

[Claims] 1. A digital broadcast transmission channel sequentially receives channels including a predetermined program, and digitally compressed video data corresponding to the predetermined program is extracted from a transport stream included in the received channel. Then, the extracted video data is decoded to obtain a digital video signal, and the digital video signal is stored as a program display screen signal of the specified program in a memory for at least one screen for each program. A digital broadcast receiving method comprising: selecting a desired program display screen signal from stored program display screen signals and outputting the selected program display screen signal to an image display means. 2. The digital broadcast receiving method according to claim 1, wherein a plurality of program display screen signals stored in the memory are reduced and multi-screen displayed. 3. The digital broadcast receiving method according to claim 1, wherein a transmission channel including a plurality of designated program trains is received at regular intervals. 4. A program of one of a plurality of designated program trains is received, a display screen signal of the program is stored in a memory, and a program to be received next and a series of program display screen signals are received. The digital broadcast receiving method according to claim 1 or 2, characterized by storing. 5. A channel including a predetermined program is sequentially received from digital broadcast transmission channels, and digitally compressed video data corresponding to the predetermined program is extracted from a transport stream included in the channel, Replace the data of the sequence header part in which the decoding control information included in the extracted video data is stored with the data that can be decoded only with the intra-frame coded image data of one screen, and the replaced sequence header part Program display screen data including the data of the above and the intra-frame coded image data is stored in a memory for each screen for each program, and desired program display screen data is selected from the memory to decode a digital video signal. Digital broadcasting receiving method including. 6. A program display screen signal obtained by sequentially decoding the program display screen data stored in the memory is reduced, and the reduced program display screen signal is stored in the memory as a multi-screen signal for split-screen display. The digital broadcast receiving method according to claim 5, wherein the multi-screen display is performed while storing. 7. The digital broadcast receiving method according to claim 5, wherein a transmission channel including a plurality of designated program trains is received at regular intervals. 8. A program of one of a plurality of designated program trains is received, a display screen signal of the program is stored in a memory, and a program to be received next and a series of program display screen data are received. The digital broadcast receiving method according to claim 5, wherein the method stores the digital broadcast. 9. A tuner module for sequentially receiving channels including a predetermined program from digital broadcast transmission channels to obtain a transport stream including digitally compressed video data, and the predetermined channel from the transport stream. Demultiplexer for extracting digitally compressed video data corresponding to the program, a video decoder for decoding the video data to obtain a digital video signal, and a program display screen signal for the digital video signal corresponding to the predetermined program A first memory for storing at least one screen for each program, storage control of the program display screen signal in the first memory, and the program display screen signal stored in the first memory Memory control means for controlling output of a desired program display screen signal from the tuner, Joule, said demultiplexer, said video decoder, and a digital broadcast receiving apparatus characterized by comprising a receiving device control means for controlling said memory control means. 10. The digital broadcast receiving apparatus according to claim 9, wherein the memory control means performs a reduction process on the plurality of program display screen signals stored in the first memory so that the program display screen signals can be displayed on multiple screens. 11. The receiving device control means sequentially receives a transmission channel including a plurality of designated program trains at regular intervals by a tuner module, and a display screen signal of the designated program is stored in a first memory. 11. The digital broadcast receiving apparatus according to claim 9, wherein the digital broadcast receiving apparatus is controlled so as to store one screen at a time. 12. A series of receiving device control means, wherein a tuner module receives one program of a plurality of designated program trains, and stores a display screen signal of the program in the first memory one screen at a time. 11. The digital broadcast receiving apparatus according to claim 9 or 10, wherein after the storage operation is completed, control is performed such that reception of a program to be received next and storage operation of a series of program display screen signals are performed. 13. A tuner module for sequentially receiving channels including a predetermined program from digital broadcast transmission channels to obtain a transport stream including digitally compressed video data, and the predetermined channel from the transport stream. Demultiplexer for extracting digitally compressed video data corresponding to the program, and decoding the data of the sequence header part in which the decoding control information included in the video data is stored, using only intra-frame encoded image data of one screen Sequence header replacement circuit for replacing the program display screen data including the replaced sequence header portion data and the intra-frame encoded image data with one screen for each program And a desired program display image from the second memory Memory control means for selecting data, a video decoder for decoding a digital video signal from the desired program display screen data, a tuner module, the demultiplexer, a sequence header replacement circuit, a memory control means and a video decoder And a receiver control means for controlling the digital broadcast receiver. 14. A memory control means for controlling the sequential reading of the program display screen data stored in the second memory, and a digital video signal from the read program display screen data to decode the program display screen signal. A video decoder for outputting, a third memory for storing a plurality of the program display screen signals as a multi-screen signal for screen division display, and a control for reducing the plurality of program display screen signals and storing them in the third memory 14. The digital broadcast receiving apparatus according to claim 13, further comprising a memory control unit for performing the above. 15. The receiving device control means successively receives a transmission channel including a plurality of designated program trains at regular intervals by a tuner module, and the display screen data of the designated program is stored in a second memory. The digital broadcast receiving device according to claim 13 or 14, wherein the digital broadcast receiving device is controlled so as to store one screen at a time. 16. A series of receiving device control means, wherein a tuner module receives one program of a plurality of designated program trains, and stores display screen data of the program one screen at a time in a second memory. 14. The control is performed so that after the storage operation is completed, reception of a program to be received next and storage operation of a series of program display screen data are performed.
4. The digital broadcast receiver according to item 4.