JP2006237957A - Digital broadcasting receiving set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out multi-screen display of audiovisual channel image signals at the time of switching digital broadcasting channels with simple structure. <P>SOLUTION: The digital broadcasting receiving set is provided with a main tuning receiver 3M for receiving digital broadcasting channels selected by a channel selection sector 23; a subtuning receiver 3S for carrying out a predetermined time sequential tuning reception which receives two or more audiovisual digital broadcasting channels; a broadcast data storage 15 for storing compressed image signals of two or more channels received in the subtuning receiver 3S; a multi-screen animation formation section 16 for creating the multi-screen animation signals, by reading out the compressed image signals of two or more channels stored in the broadcast data storage section 15; and image processors 7-9 for displaying image information by image processing the multi-screen animation signals created in the multi-screen animation formation section 16, at the time of selecting an audiovisual channel by the channel selection section 23, usually displaying image information by the image processing of the received digital broadcasting data received by the main tuning receiver. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital broadcast receiving apparatus that receives a digital broadcast broadcast using a cable television transmitted using a digital broadcast radio wave or cable transmitted from a broadcast satellite or a ground station.

  In digital broadcasting signals, video signals for multiple channels are combined to generate a service video signal, and data content having a multi-view function is simultaneously transmitted, and each of the service video signals is generated using the multi-view function. Multi-view channel in digital broadcasting, which is displayed for each frame of the designated multi-screen, and when the video of the service video signal displayed on the multi-screen is designated, it is switched to the designated video channel. A selection method is known (see, for example, Patent Document 1).

In addition, a plurality of tuner units that receive one channel by one tuner unit are provided, each tuner unit receives each program, the controller unit processes data from each tuner unit in parallel, and each tuner unit The received data is decomposed into data for each channel and recorded in a recording unit corresponding to the tuner unit, and the data stored in the recording unit is extracted by the controller unit even though it is recorded. There is known a TV program viewing apparatus that can be viewed retroactively (see, for example, Patent Document 2).
JP-A-2002-282106 (first page, FIG. 1) JP 2002-165216 A

  However, in the conventional example described in Patent Document 1, data content having a multi-view function is created and transmitted on the transmission side of the digital broadcast, and the digital content is received by the digital broadcast receiving device. When the video of the service video signal displayed on the multi-screen is specified, it is possible to switch to the specified video channel. If the data content service is not available, the video of the corresponding channel will be displayed only when the user switches the desired channel, and the unresolved issue that the operation at the time of channel selection is inconvenient There is.

  Further, in the conventional example described in Patent Document 2, a number of tuners corresponding to the number of channels that can be viewed are prepared, and any recorded data can be recorded while recording data in a recording unit corresponding to each tuner. The part can be pulled out and viewed retroactively, and the recorded data stored in each recording unit can be collected and displayed on a multi-screen, but depending on the number of digital broadcasting channels that can be viewed Therefore, there is an unsolved problem that a tuner unit and a signal processing unit are required, and the manufacturing cost is high, which is not realistic.

  Therefore, the present invention has been made paying attention to the unsolved problems of the above-mentioned conventional example, and can display video signals of channels that can be viewed when switching digital broadcasting channels with a simple configuration on multiple screens. The object is to provide a digital broadcast receiver.

  The digital broadcast receiving apparatus according to the first technical means has a channel selection unit for selecting a channel of digital broadcast to be selected and viewed, and main channel reception for receiving the digital broadcast of the channel selected by the channel selection unit. A sub-selection receiving unit that sequentially selects and receives digital broadcasts of a plurality of channels that can be viewed at predetermined time intervals, and a broadcast data storage unit that stores compressed video signals of the plurality of channels received by the sub-selection reception unit A multi-screen moving image creating unit for reading a plurality of channels of compressed video signals stored in the broadcast data storage unit to create a multi-screen moving image video signal; and compression of the digital broadcast channel normally received by the main channel selection receiving unit The multi-screen video creation unit when the video signal is processed to display video information and the channel selection unit selects a channel to be selected for viewing. It is characterized by comprising a video processor for displaying the multi-screen video information multi-screen video image signal generated by image processing.

  In the first technical means, a digital broadcast of a digital broadcast channel selected by the channel selection unit is received by the main channel selection reception unit, and the received digital broadcast reception signal is processed by the video processing unit and displayed on the display device. In this state, the sub-channel selection receiving unit selects and receives digital broadcasts of channels that can be viewed sequentially, and stores the compressed video signals separated from the received digital broadcast reception signals of each channel in the broadcast data storage unit in sequence. The multi-screen video creation unit creates a multi-video video signal from the digital broadcast compressed video signal stored in the broadcast data storage unit, so that when the channel selection unit selects a channel, the multi-screen video creation unit The created multi-screen video signal can be processed by the video processor and displayed on the display device, and only one tuner is added. , It can be displayed easily multi-video screen.

  The digital broadcast receiving apparatus according to the second technical means is the first technical means, wherein the main channel selection receiving unit and the sub channel selection receiving unit are a main tuner and a sub tuner, and these main tuner and sub tuner. A main demodulator and a sub demodulator that individually demodulate received digital broadcast reception data, and a main data that separates the compressed video signal by demultiplexing the transport stream output from the main demodulator and sub demodulator. A multiplexer and a sub-demultiplexer are provided.

In the second technical means, since the compressed video signal is separated by the sub-demultiplexer included in the sub-channel selection receiving unit, the separated compressed video signal can be supplied to the broadcast data storage unit. The storage capacity of the storage unit can be reduced.
Furthermore, in the digital broadcast receiving apparatus according to the third technical means, in the first or second technical means, the multi-screen moving image creating unit receives compressed video signals of all channels viewable in the broadcast data storage unit. A decoder that sequentially reads and decodes the compressed video signal of each channel from the broadcast data storage unit each time it is stored, and a multi-video processing unit that converts the video signal of each channel decoded by the decoder into a multi-video signal; An encoder that compresses and encodes a multi-video signal output from the video processing unit, a multi-screen compressed video signal storage unit that sequentially stores a multi-screen compressed video signal compression-encoded by the encoder, and a channel selection A multi-image compressed video signal that sequentially reads out the multi-screen compressed video signal stored in the multi-screen compressed video signal storage unit It is characterized by comprising a detecting section.

  In this third technical means, every time compressed video signals of all viewable channels are stored in the broadcast data storage unit, each compressed video signal is read from the broadcast data storage unit and decoded by the decoder, and then the The multi-screen video signal is converted into a multi-screen video signal by the video processing unit, the multi-screen video is compression-encoded by an encoder, stored in the multi-screen compressed video signal storage unit a predetermined number of times, and stored in the multi-screen compressed video signal storage unit. When the channel is selected, the compressed image signal can be sequentially read to display a multi-moving picture screen. At this time, in the broadcast data storage unit, it is only necessary to sequentially overwrite the broadcast data corresponding to the number of channels that can be viewed, so that the storage capacity is small. Further, the multi-screen compressed video signal storage unit also stores the multi-screen compressed video signal, so that the storage capacity can be reduced.

Still further, in the digital broadcast receiving apparatus according to the fourth technical means, in the third technical means, the decoder and the multi-video processing unit are configured using functions of the video processing unit. It is said.
In the fourth technical means, the configuration of the multi-screen video creation unit can be simplified by configuring the decoder and the multi-video processing unit that constitute the multi-screen video creation unit by using the function of the video processing unit. it can.

Still further, the digital broadcast receiving apparatus according to the fifth technical means is characterized in that, in any one of the first to third technical means, the channel selection unit is constituted by a remote control device.
In the fifth technical means, when a channel is selected by a remote control device, multi-screen video data of each viewable digital broadcast channel is displayed on a display device, so that a user's favorite channel can be easily selected. can do.

In the digital broadcast receiving apparatus according to the sixth technical means, in any one of the first to fifth technical means, the broadcast data storage unit is configured to sequentially store BML data of the data broadcast. It is a feature.
In the sixth technical means, by storing the data broadcast in the broadcast data storage unit, the display screen based on the BML data of the data broadcast can be displayed as multi-screen moving image data. By storing broadcast data every time a BML document is changed, the same broadcast data as actual broadcast data can be displayed as multi-screen moving image data.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a first embodiment of the present invention. In the figure, reference numeral 1 denotes a digital broadcast receiver, which is a digital broadcast radio wave transmitted from a digital broadcast station. The digital broadcasting radio wave received by the receiving antenna 2 is supplied to the main channel selection receiving unit 3M and the sub channel selection receiving unit 3S.

Each of the main channel selection receiving unit 3M and the sub channel selection receiving unit 3S includes a main tuner 4M and a sub tuner 4S, a main demodulator 5M and a sub demodulator 5S, and a main demultiplexer 6M and a sub demultiplexer 6S.
The main tuner 4M is a tuner used for channel selection of a normal broadcast channel, and is set with a digital broadcast channel number and corresponding frequency data, and a selected channel number CH is input from the control circuit 21 described later. Then, digital broadcast data having a frequency corresponding to the selected channel number CH is extracted, and the extracted digital broadcast data is output to the main demodulator 5M.

  The sub-tuner 4S is a tuner having a sequential channel selection function for sequentially switching received digital broadcast data at a predetermined time interval, and the digital broadcast channel number and corresponding frequency data are set in the same manner as the main tuner 4M. Each time a selected channel number is input from the control circuit 21 described later, digital broadcast data having a frequency corresponding to the selected channel number is extracted, and the extracted digital broadcast data is output to the sub-demodulator 5S.

  Each of the demultiplexer circuits 6M and 6S performs TS synchronization processing on the TS output from the main demodulator 5M and the sub demodulator 5S, demultiplexes the TS video signal, the TS audio signal, and the selection as MPEG data. Separated into additional information composed of station data, program data, and the like, and outputs a TS video signal as a compressed video signal, which is the separated MPEG data, to the MPEG video decoder 8 via the selection switch 7 and the channel selection information And additional information including program information and the like is output to the control circuit 21 described later.

  The selection switch 7 selects the TS video signal of the selected digital broadcast output from the main channel selection receiving unit 3M when the selection signal SL output from the control circuit 21 described later has a logical value “0”. When supplied to the MPEG video decoder 8 and the selection signal SL is a logical value “1”, the multi-screen TS video signal as the multi-screen compressed video signal created by the multi-screen moving image creation unit 16 is selected and the MPEG video decoder 8 is selected. To supply.

The MPEG video decoder 8 decodes the TS video signal or multi-screen TS video signal input from the selection switch 7 and converts it into a video signal, and outputs the converted video signal to the video processor 9.
The video processor 9 adjusts the luminance, contrast, etc. of the input video signal and supplies it as video data to a display device 10 comprising a liquid crystal display, plasma display, CRT display, etc. Data is displayed.

Here, the selection switch 7, the MPEG video decoder 8, and the video processor 9 constitute a video processing unit.
On the other hand, the audio data output from the main demultiplexer 6M is supplied to the MPEG audio decoder 11, decoded by the MPEG audio decoder 11 and converted into an audio signal, and the audio processor 12 adjusts the volume etc. It is performed, supplied to the speaker 13, and uttered from the speaker 13.

On the other hand, the TS video signal of each digital broadcast channel output from the demultiplexer 6S of the sub-channel selection receiving unit 3S is supplied to the broadcast data storage unit 15 composed of a flash memory, a hard disk, etc., and is sequentially stored.
Each time compressed video data of all digital broadcast channels that can be viewed is stored in the broadcast data storage unit 15, each TS video signal is read from the broadcast data storage unit 15 and supplied to the multi-screen moving image creation unit 16. Is done.

  The multi-screen moving image creating unit 16 decodes the TS video signal sequentially read from the broadcast data storage unit 15 and converts it into a video signal, and views the video signal decoded by the MPEG video decoder 17. A video processor 18 that forms a multi-screen video signal in which a small number of small screens corresponding to the number m of possible digital broadcasting channels (m is an arbitrary natural number) are arranged in parallel, and a multi-screen video output from the video processor 18 An encoder 19 that compresses and encodes a signal to convert it into a multi-screen TS video signal as a multi-screen compressed video signal, and a predetermined number n (n is an arbitrary natural number) of multi-screen TS video signals output from the encoder 19 And a multi-screen compressed video signal storage unit 20 for storage.

Then, the multi-screen TS video signal stored in the multi-screen compressed video signal storage unit 20 is sequentially read out by the control circuit 21 and supplied to the selection switch 7 when selecting a channel to be described later.
On the other hand, the control circuit 21 controls the main tuner 4M of the main selection receiving unit 3M based on a remote control signal such as a channel number selection signal and a volume adjustment signal received from the remote control 23 as an external remote control device by the remote control receiving circuit 22. The selected channel number to be selected is output, and the channel number of the digital broadcast that can be viewed every predetermined time is output to the sub-tuner 4S of the sub-selection receiving unit 3S, for example, and the selected channel number CH is output and further selected. A selection signal SL having a logical value “1” is output to the switch 7 when a channel is selected, and a selection signal SL having a logical value “0” is output during other normal processing.

Here, the control circuit 21 includes, for example, a central processing unit 21a that executes at least the digital broadcast receiving process shown in FIG. 2, a ROM 21b that stores a program for processing executed by the central processing unit 21a, and a process executed by the central processing unit 21a. The microcomputer 21M includes a RAM 21c that stores data of the calculation process and calculation result data.
As shown in FIG. 2, the digital broadcast reception process executed by the central processing unit 21a is started when the power of the digital broadcast reception device 1 is turned on. The selection signal SL having the value “0” is output, and then the process proceeds to step S2, where it is determined whether or not the remote control receiving circuit 22 has received the channel number selection signal from the remote control 23, and the channel number selection signal has been received. Sometimes the process proceeds to step S3, and the channel number designated by the channel number selection signal is output to the main tuner 4M, and then the process proceeds to step S5.

If the channel number selection signal is not received from the remote controller 23 as a result of the determination in step S2, the process proceeds to step S4, and the channel number stored at the end of the previous reception is output to the main tuner 4M and then to step S5. Transition.
In step S5, it is determined whether or not additional information composed of channel selection information and program information demultiplexed from the demultiplexer circuit 6M has been input. If additional information has not been input, it waits until it is input. When additional information is input, the process proceeds to step S6.

In this step S6, the digital broadcast channels that can be received are determined based on the channel selection information included in the additional information, the determined digital broadcast channels are sorted in ascending order of channel numbers, for example, and then the process proceeds to step S7. For example, the youngest channel number is output to the sub-tuner 4S as the selected channel number, and the process proceeds to step S8.
In this step S8, it is determined whether or not the TS video signal is output from the sub-demultiplexer circuit 6S. When the TS video signal is output, the process proceeds to step S9, and the TS video signal is channeled to the broadcast data storage unit 15. After storing in correspondence with the number, the process proceeds to step S10.

  In this step S10, it is determined whether or not a channel selection mode signal has been input from the remote control. If no channel selection mode signal has been input, the process proceeds to step S11, where the next channel number after the current channel number exists. If there is a next younger channel number, the process proceeds to step S12 to output the corresponding channel number as a selected channel number to the sub-tuner 4S, and then returns to step S8. If the channel number does not exist, it is determined that the storage of all TS video signals in the digital broadcast channel that can be viewed in the broadcast data storage unit 15 is completed, and the process proceeds to step S13.

  In this step S13, a data read process is performed in which TS video signals in m channels stored in the broadcast data storage unit 15 are sequentially read and supplied to the MPEG video decoder 17, and then the process proceeds to step S14 to read the data. It is determined whether or not the process is completed. When the data read process is not completed, the process returns to step S13. When the data read process is completed, the process returns to step S7.

  If the TS video signal is not output from the sub-demultiplexer circuit 6S as a result of the determination in step S8, the process proceeds to step S15, and whether the channel selection mode signal is input from the remote controller 23 as in step S10. If no channel selection mode signal is input, the process returns to step S8. If a channel selection mode signal is input, the process proceeds to step S16.

  In this step S16, the selection signal SL of the logical value “1” is output to the selection switch 7, and then the process proceeds to step S17, and a predetermined number n times stored in the multi-screen compressed video signal storage unit 20 is performed. The multi-screen TS video signal is sequentially read out, and this multi-screen TS video signal is output to the MPEG video decoder 8 via the selection switch 7, and then the process proceeds to step S18 where the channel number selection signal is input from the remote controller 23. Thus, it is determined whether or not a desired channel has been selected. If the desired channel has not been selected, the process proceeds to step S19, and the read address of the multi-screen compressed data storage unit 20 is incremented before the step S17. Returning to step S20, when the desired channel is selected, the process proceeds to step S20.

In step S20, the channel number of the selected desired channel is output to the main tuner 4M, and then the process proceeds to step S21. After the selection signal SL having the logical value “0” is output to the selection switch 7, the step is performed. Return to S11.
In the process of FIG. 2, the process of step S17 corresponds to the multi-image compressed video signal reading unit.

Next, the operation of the first embodiment will be described.
Assuming that the power of the digital broadcast receiving apparatus 1 is not turned on now, the power is not supplied to all the circuits including the control circuit 21, and the digital broadcast cannot be received except for the emergency broadcast. .
In this state, when the power of the digital broadcast receiving apparatus 1 is turned on, the power is supplied to all the circuits including the control circuit 21 of FIG. 1 to be in an operating state, and the central processing unit 21a in the microcomputer 21M of the control circuit 21 Then, execution of the digital broadcast receiving process shown in FIG. 2 is started.

  In this digital broadcast reception process, first, a selection signal SL having a logical value “0” is output to the selection switch 7 (step S1), whereby the main channel selection receiving unit 3M is selected by the selection switch 7, and the demultiplexer is selected. The TS video signal output from the circuit 6M is supplied to the MPEG video decoder 8 via the selection switch 7, and the video signal output from the MPEG video decoder 8 is set to be processed by the video processor 9.

  Next, it is determined whether or not a channel number selection signal for designating a channel number is input from the remote controller 23. When the channel number selection signal is not input, the channel number at the end of the previous viewing is output to the main tuner 4M (step). S4) When the channel number selection signal is received by the remote control receiving circuit 22 by the user operating the remote controller 23 and specifying the channel number, the channel number signal CH for selecting the channel number specified by the received channel number selection signal Is output to the main tuner 4M (step S3).

  Therefore, as shown in FIG. 3A, the main tuner 4M extracts the digital broadcast data of the designated channel number CH1 and frequency-processes it, and demodulates it with the demodulator 5M to demultiplex the TS. Output to circuit 6M. In the demultiplexer circuit 6M, after the TS synchronization processing is performed on the input TS, it is demultiplexed and added information composed of a TS video signal, TS audio signal, channel selection information, program information, etc., which are MPEG data. The additional information is output to the central processing unit 21a of the microcomputer 21M, the TS video signal is supplied to the MPEG video decoder 8 via the selection switch 7, and the TS audio signal is supplied to the MPEG audio decoder 11.

The MPEG video decoder 8 decodes the input TS video signal and converts it into a normal video signal, outputs the converted video signal to the video processor 9, and the MPEG audio decoder 11 decodes the TS audio signal and outputs the normal video signal. And the converted audio signal is output to the audio processor 12.
For this reason, the video processor 9 adjusts the luminance, contrast, and the like of the input video signal, and then outputs the video signal to the display device 10. The display device 10 displays the video information of the corresponding channel.

  On the other hand, when additional information is output from the demultiplexer circuit 6M, a receivable digital broadcast channel is determined based on the channel selection information included therein, the determined digital broadcast channel numbers are sorted, and the channel numbers are sorted in ascending order. Rearrangement (step S6), the channel of the youngest digital broadcast channel is output to the sub-tuner 4S as the selected channel number (step S7).

For this reason, the sub tuner 4S also starts receiving the digital broadcast channel corresponding to the selected channel number, frequency-processes the received digital broadcast data, and demodulates the output by the demodulator 5S, thereby sub-demultiplexer as TS. Output to the circuit 6S.
In the sub-demultiplexer circuit 6S, the TS synchronization process is performed on the TS, and then the demultiplexing is performed to separate the TS video signal into a compressed video signal, a compressed audio signal, and additional information which are MPEG data, and the TS video signal is broadcast data storage unit As shown in FIG. 3B, the TS video signal of the youngest digital broadcast channel CH1 is stored in the storage area MD1 corresponding to the channel number.

  If the channel selection mode signal for channel selection is not input from the remote controller 23 after the TS video signal is stored in the broadcast data storage unit 15, the process proceeds from step S10 to step S11. It is determined whether or not there is a young channel number. If there is a next young channel number, the process proceeds to step S12, and the corresponding channel number CH2 is output to the sub-tuner 4S as the selected channel number to switch the channel. I do.

Then, the same processing as described above is performed for the new channel number CH2, and the TS video signal output from the sub-demultiplexer circuit 6S corresponds to the channel number of the broadcast data storage unit 15 as shown in FIG. Store in the storage area MD2.
In this way, the TS video signal is stored in the broadcast data storage unit 15 while sequentially increasing the channel numbers of digital broadcast stations that can be sequentially received, and when the storage of the TS video signal in the uppermost channel number CHm is completed, When the process proceeds to step S11, there is no next young channel number, so the process proceeds to step S13.

In step S13, TS video signals in all viewable digital broadcast channels stored in the broadcast data storage unit 15 are sequentially read from the storage areas MD1 to MDm, and the TS video signals are supplied to the MPEG video decoder 17. The MPEG video decoder 17 decodes and converts it into a normal video signal, which is sequentially supplied to the video processor 18.
Therefore, the video processor 18 forms a multi-screen video signal for displaying the video signals for m channels that can be viewed as a multi-screen shown in FIG. 4, and supplies the multi-screen video signal to the encoder 19. It is compression-encoded and converted into a multi-screen TS video signal of MPEG data, and this multi-screen TS video signal is stored in the first storage area MDI1 of the multi-screen compressed video signal storage unit 20 as shown in FIG. To do.

The multi-screen creation process is repeated every time TS video signals in all digital broadcast channels that can be viewed are stored in the broadcast data storage unit 15, and the multi-screen compressed video signal storage unit 20 is shown in FIG. In this way, a predetermined number n of multi-screen TS video signals are sequentially stored in the storage areas MDI1 to MDIn.
Therefore, the multi-screen TS video signal in which TS video signals in all the digital broadcast channels that can be viewed are arranged in the multi-screen compressed video signal storage unit 20 until the channel selection mode signal CSLM is input from the remote controller 23. Are always updated and updated.

In this state, when the user selects the channel selection mode by operating the remote controller 23 in order to view a digital broadcast channel different from the digital broadcast channel currently being viewed by the user, the channel selection mode signal CSLM is shown in FIG. As shown in (e), for example, it is transmitted by infrared communication and received by the remote control receiving circuit 22.
When the remote control receiving circuit 22 receives the channel selection mode signal CSLM in this way, the process proceeds from step S8 or S10 in the process of FIG. 2 to step S16, and the selection signal SL having the logical value “1” is output to the selection switch 7. To do. For this reason, the state in which the selection switch 7 selects the video signal of the main channel selection receiving unit 3M is switched to the state of selecting the multi-screen TS video signal from the multi-screen compressed video signal storage unit 20, and then step S17. Then, the multi-screen TS video signal stored in the multi-screen compressed video signal storage unit 20 is read out from the oldest and output to the selection switch 7.

  Therefore, since the multi-screen TS video signal stored in the multi-screen compressed video signal storage unit 20 is supplied to the MPEG video decoder 8, it is decoded by the MPEG video decoder 8 and converted into a normal multi-screen video signal. Since this is processed by the video processor 9 and supplied to the display device 10, the video signals of the m digital broadcast channels that can be viewed shown in FIG. 4 are displayed on the display device 10 as shown in FIG. An array of multiple screens can be displayed.

  For this reason, the user can easily select a desired channel by visually recognizing the multi-screen displayed on the display device 10, and when the channel desired to be viewed is determined, the channel number is selected with the key, and FIG. Channel selection is performed by transmitting a channel number selection signal CSL as shown in (e), and the selected channel number is output to the main tuner 4M (step S19). A selection signal SL of “0” is output, and the selection switch 7 is switched to select the TS video signal from the main channel selection receiver 3M, and the video signal of channel number CH4 is switched as shown in FIG. After displaying on the display device 10, the process proceeds to step S <b> 11, and the TS data of the digital broadcast channel that can be viewed on the broadcast data storage unit 15. Storage of signals is resumed to restart the updating of the multi-screen video signal.

  When the user directly inputs a channel number without setting the channel selection mode with the remote controller 23 when selecting a channel, a channel number selection signal corresponding to the input channel number is transmitted to the remote control receiving circuit 22, thereby The channel number designated by the channel number selection signal is output to the tuner 4M, and the digital broadcast wave of the selected digital broadcast channel is received and processed.

  As described above, according to the first embodiment, the TS video signal in the viewable digital broadcast channel output from the sub-channel selection receiving unit 3S is stored in the broadcast data storage unit 15, and the TS video in all channels is stored. Each time the signal storage is completed, the multi-screen moving image creating unit 16 forms a multi-screen TS video signal, which is stored in the multi-screen compressed video signal storage unit 20, and stored in the multi-screen compressed video signal when the user selects a channel. The multi-screen TS video signal stored in the unit 20 is supplied to the MPEG video decoder 8 via the selection switch 7 to be converted into a multi-screen video signal, which is then processed by the video processor 9 and displayed. 10 can be displayed on a multi-screen with a simple configuration, and the user can easily select a desired channel. Ukoto can.

  In the first embodiment, the case where the storage of the TS video signal in the broadcast data storage unit 15 is stopped while the multi-screen is displayed has been described. However, the present invention is not limited to this. If the TS video signal storage timing to the broadcast data storage unit 15 and the TS video signal read timing from the broadcast data storage unit 15 are controlled so as not to coincide with each other, the broadcast data storage is performed when the multi-screen is displayed. The TS video signal may be stored in the unit 15.

Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the MPEG video decoder 17 and the video processor 18 constituting the multi-screen moving image creating unit 16 in the first embodiment are omitted, and these are replaced by the MPEG video decoder 8 and the video processor 9. It is a substitute.
That is, in the second embodiment, as shown in FIG. 5, in the configuration of FIG. 1 in the first embodiment described above, a plurality of TS video signals are simultaneously sent to the MPEG video decoder 8 and the video processor 9 in parallel. A video signal separator 32 for separating the video signal is provided on the output side of the video processor 9 and the display video signal separated by the video signal separator 32 is displayed on the display device. 10 except that the multi-screen video signal is input to the encoder 19, and corresponding parts to those in FIG. This is not described in detail here.

  In the second embodiment, the selection switch 7 selects either the TS video signal output from the main channel selection receiver 3M or the multi-screen compressed TS video signal read from the multi-screen compressed video signal storage unit 20. The display TS video signal and the multi-screen TS video signal composed of the TS video signals of the viewable channels stored in the broadcast data storage unit 15 are supplied to the MPEG video decoder 8, and the decoder 8 The TS video signal and the multi-screen TS video signal are individually decoded and converted into a display video signal and a multi-screen video signal, and both video signals are supplied to the video processor 9.

The video processor 9 individually processes the video signal for display and the video signal for multi-screen, and outputs them to the video signal separator 32. The video signal separator 32 uses the video signal for display and the multi-screen video signal. The video signal is separated and the display video signal is output to the display device 10 and the multi-screen video signal is output to the encoder 19.
For this reason, in the display device 10 in the program viewing state in which the digital broadcast channel to be viewed is selected, the TS video signal output from the main channel selection receiver 3M is selected by the selection switch 7 and is used as the display TS video signal. The video signal is decoded by the MPEG video decoder 8 and converted into a video signal for display. The video signal for display is processed by the video processor 9 and input via the video signal separator 32. A program is displayed.

  During this time, the TS video signals of each viewable digital broadcast channel selected and received by the sub-channel selection receiving unit 3S are sequentially stored in the broadcast data storage unit 15, and the storage of the TS video signals in all the digital broadcast channels is completed. The TS video signals in the respective channels stored in the broadcast data storage unit 15 are sequentially read out by the central processing unit 21a of the microcomputer 21M and decoded by the MPEG video decoder 8 as a multi-screen forming TS video signal. This is converted into a forming video signal, which is converted into a multi-screen video signal by the video processor 9, further separated from the display video signal by the image signal separator 32, and input to the encoder 19 for compression encoding. Therefore, as in the first embodiment described above, a predetermined number of multi-screen compressed video signals are stored in the multi-screen compressed video signal storage unit 20 and are sequentially updated.

  Therefore, when the user transmits a channel selection mode signal from the remote control 23 to the remote control receiving circuit 22 when selecting a channel, the multi-screen TS video signal stored in the multi-screen compressed video signal storage unit 20 is selected as a display TS video signal. 7 is decoded by the MPEG video decoder 8 and converted into a multi-screen video signal. The multi-screen video signal is separated by the video signal separator 32 and supplied to the display device 10. A multi-screen of digital broadcasting channels that can be viewed can be displayed, and a user can easily select a desired channel by visually recognizing the displayed multi-screen.

In addition, in the second embodiment, the decoder process and the multi-screen configuration process in the multi-screen video creation unit 16 are performed using the functions of the MPEG video processing unit 8 and the video processor 9, so that the multi-screen video creation unit The configuration of 16 can be further simplified.
In the second embodiment, the case where one multi-screen compressed video signal storage unit 20 is provided has been described. However, the present invention is not limited to this, and a plurality of multi-screen compressed video signal storage units 20 and their A selection circuit, and when reading a multi-screen TS video signal from one of the multi-screen compressed video signal storage unit 20, the multi-screen TS video signal is sequentially transferred to the remaining multi-screen compressed video signal storage unit 20. The latest multi-screen TS video signal is constantly updated by selecting the multi-screen compressed video signal storage unit 20 that has been stored and has been stored by the selection circuit when a predetermined number of multi-screen TS video signals have been stored. The latest multi-screen display can be performed.

  In the first and second embodiments, the TS video signal of the digital broadcast channel is stored in the broadcast data storage unit 15 and the multi-screen TS video signal is sequentially stored in the multi-screen compressed video signal storage unit 20. As described above, the present invention is not limited to this. When a data broadcast channel is selected, the BML data output from the sub-channel selection receiving unit 3S is stored in the broadcast data storage unit 15 in order, so that the BML screen It can be displayed on the display device 10 by being incorporated in a screen. In this case, since the broadcast data storage unit 15 can store a plurality of BML data, the remote control 23 transmits a BML data multi-display signal separately from the channel selection while viewing one data broadcast. The central processing unit 21a monitors the BML data and stores the BML data in the broadcast data storage unit 15 sequentially each time the BML data is changed, so that the stored BML data can be displayed as a multi-screen. .

  In the first and second embodiments, the case where a receivable digital broadcast channel is set based on the additional information output from the main demultiplexer circuit 6M has been described. However, the present invention is not limited to this. Instead, the receivable digital broadcast channel corresponding to the area where the digital broadcast receiving apparatus is installed is stored in the storage table in advance, and the receivable digital broadcast channel is read from the storage table and set according to the installation area. May be.

Furthermore, in the first and second embodiments described above, the case where the receivable digital broadcast channels are sorted in order from the smallest number is described, but the present invention is not limited to this, and the channel number is large. You may make it sort in order, and you may make it arrange | position a channel number at random.
Furthermore, in the first and second embodiments, the case where the number of tuners is one for each of the main channel receiving unit 3M and the sub channel receiving unit 3S has been described. However, the present invention is not limited to this. Rather, the main channel selection receiving unit 3M is configured with a plurality of tuners, and each tuner receives different digital broadcasts to speed up the reception switching process, or the sub channel selection receiving unit 3S is configured with a plurality of tuners. Thus, it is possible to speed up the multi-screen creation processing by speeding up the viewable digital broadcast channel reception switching processing.

In the first and second embodiments, the case where the remote controller 23 is applied as the channel selection unit has been described. However, the present invention is not limited to this, and a numeric keypad, a keyboard, or the like is applied as the channel selection unit. May be.
Furthermore, in the first and second embodiments, when the user selects a desired channel while the multi-video screen display is being performed, the remote controller 23 is used to perform key input of the desired channel number. However, the present invention is not limited to this, and a small display screen of each viewable channel constituting the multi-video screen is set as a selection button, and this selection button is selected by the remote controller 23. Channel selection may be performed.

It is a block diagram which shows the 1st Embodiment of this invention. It is a flowchart which shows an example of the digital broadcast reception process procedure performed with a central processing unit. It is a time chart with which it uses for description of operation | movement in 1st Embodiment. It is explanatory drawing which shows the multiscreen display state in a display apparatus. It is a block diagram which shows 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Digital broadcast receiver, 2 ... Reception antenna, 3M ... Main channel selection receiving part, 3S ... Sub channel selection receiving part, 4M ... Main tuner, 4S ... Sub tuner, 5M ... Main demodulator, 5S ... Sub demodulator, 6M ... main demultiplexer circuit, 6S ... sub demultiplexer circuit, 7 ... selection switch, 8 ... MPEG video decoder, 9 ... video processor, 10 ... display device, 15 ... broadcast data storage unit, 16 ... multi-screen video creation unit , 17 ... MPEG video decoder, 18 ... video processing unit, 19 ... encoder, 20 ... multi-screen compressed image signal storage unit, 21 ... control circuit, 23 ... remote control, 32 ... video signal separator

Claims (6)

  A channel selection unit that selects a channel of the digital broadcast to be tuned and viewed; a main channel selection reception unit that receives the digital broadcast of the channel selected by the channel selection unit; A sub-channel selection receiving unit that performs channel selection and reception sequentially, a broadcast data storage unit that stores a plurality of channels of compressed video signals received by the sub-channel selection reception unit, and a plurality of channel channels stored in the broadcast data storage unit. A multi-screen video creation unit that reads out the compressed video signal to create a multi-screen video signal, and usually displays the video information by processing the compressed video signal of the digital broadcast channel received by the main channel selection receiver, The multi-screen video signal generated by the multi-screen video creation unit is processed when the channel selection unit selects a channel to be tuned and viewed. Digital broadcast receiving apparatus characterized by comprising a video processor for displaying the multi-screen video information.   The main channel selection reception unit and the sub channel selection reception unit are a main tuner and a sub tuner, a main demodulation unit and a sub demodulation unit that individually demodulate digital broadcast reception data received by the main tuner and the sub tuner, The digital demultiplexer according to claim 1, further comprising a main demultiplexer and a sub demultiplexer for demultiplexing the transport streams output from the demodulator and the sub demodulator to separate the compressed video signals individually. Broadcast receiving device.   The multi-screen video creation unit is a decoder that sequentially reads and decodes compressed video signals of each channel from the broadcast data storage unit every time compressed video signals of all channels that can be viewed are stored in the broadcast data storage unit A multi-video processing unit for converting the video signal of each channel decoded by the decoder into a multi-video signal, an encoder for compressing and encoding the multi-video signal output from the video processing unit, and a compression code by the encoder Multi-screen compressed video signal storage unit that sequentially stores the converted multi-screen compressed video signal a predetermined number of times, and multi-image compression that sequentially reads out the multi-screen compressed video signal stored in the multi-screen compressed video signal storage unit when a channel is selected The digital broadcast receiving apparatus according to claim 1, further comprising a video signal reading unit.   4. The digital broadcast receiving apparatus according to claim 3, wherein the decoder and the multi video processing unit are configured by using functions of the video processing unit.   The digital broadcast receiving apparatus according to any one of claims 1 to 3, wherein the channel selection unit includes a remote control device.   The digital broadcast receiving apparatus according to any one of claims 1 to 5, wherein the broadcast data storage unit is configured to sequentially store BML data of a data broadcast.

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