JP4006707B2 - Digital broadcast receiving system - Google Patents

Description

  The present invention relates to a digital broadcast receiving system, and more particularly to a system for speeding up information acquisition from a plurality of necessary channels and improving operability.

In a conventional broadcast receiver, as a method for shortening the time for registering a selectable channel in the receiver, for example, a terrestrial tuner unit sequentially selects (scans) a terrestrial channel, and a satellite broadcast tuner unit. There is an example in which satellite channel scanning is performed in parallel (see, for example, Patent Document 1).
JP 2002-353780 A

  In the conventional broadcast receiver described above, as a method for shortening the time for registering a selectable channel to the receiver, for example, a terrestrial tuner unit sequentially selects (scans) a terrestrial channel, and a satellite broadcast tuner. The satellite broadcast channels are scanned in parallel in the unit, but the registration of such selectable channels to the receiver assumes analog broadcasting. There was a problem that it did not correspond to the change of the number of channels that should be.

  In digital broadcasting, in addition to registering selectable channels in the receiver, it is necessary to acquire program information used for displaying the program guide, data for broadcasting station logo marks, etc. Scans with different time periods and the number of channels to be scanned are necessary. However, since conventional broadcast receivers do not support the conditions specific to these digital broadcasts, one tuner unit is basically used in digital broadcasts. Scanning channels that can be tuned in the time required to register tunable channels in the receiver.

In addition, program information such as a program guide is not displayed for channels where information cannot be obtained by viewing, or because old information is displayed, viewing must be interrupted to obtain new information. There was a problem.
Another problem is that the logo mark of a broadcasting station is not displayed until data is acquired by viewing the program of the broadcasting station for a certain period of time.

  The present invention has been made to solve the above-described problems, and performs high-speed acquisition of broadcast information such as channel information, program information, broadcast station logo mark information, and the like of digital broadcast receivable channels. With the goal.

A digital broadcast receiving system according to the present invention includes a plurality of tuner units that perform reception operation by receiving reception signals of a plurality of channels of broadcast waves to which broadcast information supplied from an antenna is added, and channel selection by each tuner unit A plurality of demultiplexing units that separate broadcast information and video / audio data from the received signal, a storage unit that stores the acquired information, channel information that is an acquisition target among broadcast information included in the broadcast wave , A system control unit that issues a scan instruction to perform a scan operation according to broadcast information such as program information or logo mark data of a broadcasting station, and a plurality of tuner units that are viewing based on a scan instruction from the system control unit I went to see if there are no available state, assigned a plurality of channels to be tuning for each tuner unit that can be used, liked to each tuner section And a channel selection control unit that controls to receive a reception signal of the channel selected by the channel operation, and the system control unit acquires each demultiplexing unit separated from the reception signal of the channel selected by each tuner unit. The broadcast information corresponding to the scanning operation is stored in a corresponding part of the storage unit.

According to the digital broadcast receiving system of the present invention, the system control unit broadcasts the channel information, program information, or logo mark data of the broadcast station, which is the acquisition target , among the broadcast information included in the broadcast wave in the channel selection control unit. Based on the scan instruction from the system control unit, the tuning control unit goes to see if it is in a usable state that is not being viewed with respect to a plurality of tuner units. assigns a plurality of channels to be channel selection for each tuner available to control so as to receive a received signal of the selected channel by the scanning operation in the tuner, the system controller by each tuner selection Broadcast information corresponding to the scanning operation acquired by each demultiplexing unit from the received signal of the channel that has been stationed is stored in a corresponding part of the storage unit. Because it was Unishi, by storing the broadcast information corresponding to the parallel and retrieving the necessary broadcast information, acquired scan operation by a plurality of tuner units available that do not view the corresponding parts of the storage unit, Broadcast information necessary for digital broadcasting can be acquired at high speed to the digital broadcasting receiving system.

Embodiment 1 FIG.
1 is a block diagram showing a configuration of a digital broadcast receiving system according to Embodiment 1 of the present invention, FIG. 2 is a block diagram showing a configuration of a storage unit of the digital broadcast receiving system, and FIG. 3 is a channel in the digital broadcast receiving system. FIG. 4 is a flowchart showing an operation of acquiring program information in the digital broadcast receiving system. FIG. 5 is a flowchart showing an operation of acquiring a logo logo data in the digital broadcast receiving system. It is.

  The digital broadcast receiving system shown in FIG. 1 receives the antenna 1 and the reception signals of a plurality of channels of broadcast waves to which the program information supplied from the antenna 1 is added, and performs a channel selection operation. The tuner units 2 to 4, the channel selection control unit 5 that controls the channel selection of the three tuner units 2 to 4, and the program information and the video / audio data are separated from the received signals selected by each tuner unit. The first to third demultiplexing units 6 to 8, the demultiplexing control unit 9 for controlling the three demultiplexing units 6 to 8, and the video / audio data separated by each demultiplexing unit are decoded. The first to third decoding units 10 to 12 and the decoding control unit 13 that controls the three decoding units 10 to 12 are provided.

Furthermore, the digital broadcast receiving system includes first to third graphics superimposing units 14 to 14 that superimpose a data broadcasting screen, a receiver menu screen, a program guide screen, and the like on the video decoded by each decoding unit. 16, a graphics control unit 17 that controls the three graphics superimposing units 14 to 16, and first to third three display units 18 to display a signal of each graphics superimposing unit as video (sound). 20, a system control unit 21 that controls the channel selection control unit 5, the demultiplexing control unit 9, the decoding control unit 13, and the graphics control unit 17, and broadcast information necessary for the operation of the digital broadcast receiving system device. And a storage unit 22 for storage.
The storage unit 22 includes a reception table 23 in which channel information of receivable channels is registered, a program information table 24 that stores program information of receivable channels, and logos of broadcast stations of receivable channels. And a logo mark memory 25 for storing data.

In the digital broadcast receiving system according to the first embodiment, the digital broadcast signal received by the antenna 1 is divided into three systems of tuner units 2 to 4, demultiplexing units 6 to 8, decoding units 10 to 12, and graphics superimposing. The units 14 to 16 and the display units 18 to 20 can be processed in parallel.
These three systems of display units 18 to 20 may be installed in different rooms in the same house, for example. For example, a viewer who views the first display unit 18 instructs the system control unit 21 to select a favorite program, and the first tuner 2 selects a channel based on the instruction.
Similarly, a viewer who views the second display unit 19 performs a channel selection operation of the second tuner unit 3. If no one is viewing the third display unit 20, the third tuner unit 4, the third demultiplexing unit 8, the third decoding unit 12, and the third graphics superimposing unit 17 operate. Can be paused.

Next, operations that characterize the digital broadcast receiving system according to the first embodiment of the present invention will be described.
In terrestrial digital broadcasting, the channels that can be received by the digital broadcasting receiving system differ depending on the area where the receiving system is installed. Therefore, if channels that can be received are found by sequentially selecting (scanning) the channels, the channel information is obtained. Is registered in the reception table 23 of the storage unit 22 of the receiver.
After all channel information of receivable channels is registered in the reception table 23, the digital broadcast receiving system apparatus can select only receivable channels based on the information in the reception table 23.
In this receiving system having a plurality of tuner units for digital terrestrial broadcasting, when registering receivable channels, the tuners 2 to 4 and the three demultiplexing units 6 to 8 share the channels to be scanned, The time required for channel scanning can be reduced to about 1/3.

The above operation will be described in detail based on the flowchart of FIG.
Note that the example of FIG. 3 shows a case where there are three tuner units as in the configuration of FIG. In addition, the number of channels to be scanned is UHF band and CATV band even in the case of terrestrial digital receivers, and each tuner unit is configured to support both, depending on the environment used The user can perform a screen setting to switch whether the UHF band can be received or the CATV band can be received.
Therefore, the number of channels assigned to one system varies depending on whether the user can receive the UHF band or the CATV band.

First, when the user selects channel scan on the screen, the system control unit 21 instructs the channel selection control unit 5 to perform channel scan, and when the channel selection control unit 5 starts the channel scan operation (step S1), It is checked whether the tuner statuses are usable for the three tuner units 2 to 4, and the usable tuner statuses are acquired (step S2). In this case, the usable number T is three because there are three tuner units 2 to 4.
Next, the scan range is determined (step S3). That is, the tuning control unit 5 confirms whether the tuner units 2 to 4 can receive the UHF band or the CATV band.

If the user setting is that the UHF band can be received and the number of channels in the UHF band is 50 ch, channel scanning is performed for 1 to 50 ch (step S4), but there are three usable tuner units. Therefore, the channel selection control unit 5 calculates the number of channels shared by each tuner unit (step S5). In this case, the number of channels shared by each tuner unit is 16+.
Therefore, the channel selection control unit 5 assigns 1 to 17 ch to the first tuner unit 2, 18 to 34 ch to the second tuner unit 3, and 35 to 50 ch to the third tuner unit 2. A tuning instruction is given to each tuner section (step S6).

If the CATV band can be received by the user setting, assuming that the number of channels in the CATV band is 113 ch, channel scanning is performed for 1 to 113 ch (step S 7), but there are three usable tuner units. Therefore, the channel selection control unit 5 calculates the number of channels shared by each tuner unit (step S8). In this case, the number of channels shared by each tuner unit is over 37.
Therefore, the channel selection control unit 5 assigns 1 to 38 ch to the first tuner unit 2, 39 to 76 ch to the second tuner unit 3, and 77 to 113 ch to the third tuner unit 2, A tuning instruction is given to each tuner section (step S9).

Here, the case where the UHF band can be received will be described. The first tuner unit 2 starts a channel scan operation in response to a channel selection command from the channel selection control unit 5, and first sets an initial channel value (step). S10). In this case, the ch initial value is 1 ch.
Next, the first tuner unit 2 performs channel selection of the 1ch channel (step S11), and the 1ch channel includes broadcast information including channel information (hereinafter referred to as “ch information”) that is one piece of broadcast information. If there is a received signal, the first demultiplexer 6 separates the channel information from the received signal, and the receivable channel and channel information are controlled by the system. The data is stored in the reception table 23 of the storage unit 22 by the unit 21 (step S13). The channel information here refers to correspondence between physical channels (frequency) necessary for channel selection operation, transport stream identification numbers, and the like.

Next, the first tuner unit 2 performs channel up (step S14), and performs channel selection of 2ch channels. Note that if there is no broadcast wave reception signal including ch information in step S12, the process proceeds to step S14.
In this way, the first tuner unit 2 sequentially performs the channel selection operation up to the 17ch channel, and the channel information which is the channel selection data of a certain channel is sequentially stored in the reception table 23, and the channel for the last 17ch channel is stored. When the channel scan ends (step S15), the channel scan in the first tuner unit 2 ends.

Similarly to the first tuner unit 2, the second tuner unit 3 performs channel scanning according to the procedure from step S20 to step S25. In the case of the second tuner unit 3, the ch initial value is 18 ch and the last channel is 34 ch.
Similarly to the first tuner unit 2, the third tuner unit 3 performs channel scanning according to the procedure from step S30 to step S35. In the case of the third tuner unit 3, the ch initial value is 35 ch and the last channel is 50 ch.

The above is a description of the case where the UHF band can be received, but even when the CATV band can be received, the channel scanning operation is exactly the same, except that the number of channels shared by each tuner unit is changed.
When all the channel scans of the three systems, that is, the three tuner units 2 to 4 are completed, the entire channel scan operation is completed (step S36).

  As described above, according to the embodiment of the present invention, the first to third tuner units 2 to 4 can be used by sharing a plurality of different channels in the first to third tuner units 2 to 4 respectively. Since the channels are scanned in parallel and the receivable channels and necessary channel information are acquired, the channel information necessary for digital broadcasting can be acquired at a high speed to the digital broadcast receiving system.

Next, an example of acquiring program information used for a digital terrestrial broadcast program guide will be described with reference to the flowchart of FIG.
Since the program information used for the program guide or the like, which is one of the broadcast information of this terrestrial digital broadcast, is multiplexed and transmitted in the broadcast in units of broadcast stations, the program information of stations that are not viewed cannot be displayed. .
For this reason, reservations fail due to missing display of program information in the program table for stations that have not been viewed, or changes in programs when only old information has been obtained because of late updates even at stations that have been viewed, etc. Problem arises.
Therefore, when there is a system that is not used for viewing or the like among a plurality of tuner units, the program information required for that system is to be acquired.

The example of FIG. 4 shows a case where program information is acquired using the remaining two systems because one of the three systems is being viewed.
As a starting condition for acquiring program information, for example, there is a method of starting every day at a predetermined time in addition to starting by a user operation.
First, when program information acquisition is activated, the system control unit 21 instructs the channel selection control unit 5 to scan program information acquisition, and when the channel selection control unit 5 starts acquiring program information (step S101), It is checked whether the tuner statuses are usable for the three tuner units 2 to 4, and the usable tuner statuses are acquired (step S102). In this case, since the first tuner section 2 is being viewed and the second and third tuner sections 3 and 4 are usable, the usable number T is 2.

Channels from which program information is acquired are basically all receivable channels, and channels for which channel information is stored in the reception table 23 by channel scanning are targeted (step S103). However, it is also possible to make a determination that updating is not required for each channel by managing the acquisition date and time for the acquired program information.
In this case, it is assumed that channels for which program information needs to be acquired are 15ch, 21ch, 28ch, and 35ch.
Channels for which program information needs to be acquired are 15ch, 21ch, 28ch, and 35ch, which are two usable second and third tuner units (step S104), so that the channel selection control unit 5 is the second channel. The tuner unit 3 is assigned 15ch and 21ch, and the third tuner unit 4 is assigned so as to share 28ch and 35ch, and a tuning instruction is given to each tuner unit (step S105).

Then, the second tuner unit 3 starts a scanning operation in response to a channel selection command from the channel selection control unit 5, and first sets a channel initial value (step S106). In this case, the ch initial value is 15 ch.
Next, the second tuner unit 3 performs channel selection of the 15ch channel (step S107), and receives a broadcast wave including program information which is one of the broadcast information of the 15ch channel.
The second demultiplexing unit 6 acquires program information from the received signal (step S108), and the program information is stored in the program information table 24 of the storage unit 22 by the system control unit 21 (step S109). In the unlikely event that the broadcast wave of the channel cannot be received due to a stoppage or the like, it is desirable to end the processing of the channel due to a timeout.

Next, the second tuner unit 3 performs channel up (step S110), performs channel selection of the 21ch channel, and receives a broadcast wave including program information of the 21ch channel.
The second demultiplexing unit 6 acquires program information from the received signal (step S108), and the program information is stored in the program information table 24 of the storage unit 22 by the system control unit 21 (step S109).
When the program information acquisition scan for the last channel of 21ch is thus completed (step S111), the program information acquisition scan in the second tuner unit 3 ends.

  Similarly to the second tuner unit 3, the third tuner unit 4 is scanned for program information acquisition in the procedure from step S 112 to step S 117. In the case of the third tuner section 4, the ch initial value is 28 ch and the last channel is 35 ch.

  When the program information acquisition scan of the two systems, that is, the second and third tuner units 3 and 4 is completed, the entire program information acquisition scan operation ends (step S118).

  As described above, the program information can be acquired if there is a paused system among the three tuner sections. If a plurality of tuner units can be used, the program information acquisition operation can be completed in a short time by sharing the channels to be acquired.

Next, an example of acquisition of a terrestrial digital broadcasting station logo mark will be described based on the flowchart of FIG.
The data of the logo mark of the broadcasting station is multiplexed with the broadcasting program data of the broadcasting station, and cannot be acquired unless the channel is selected.
The data of the logo of the broadcasting station is not frequently changed unlike the program information. Therefore, if the data is acquired once and stored in the logo mark memory 25 of the storage unit 22, the mark is changed and the data is changed. There is no need to reacquire until a version change is detected.
Since the transmission period of the logo mark data is as long as about 10 minutes, for example, the logo mark cannot always be acquired during the scan for registering a receivable channel and the acquisition of program information described above.
Therefore, when there is a system that is not used for viewing or the like among a plurality of tuner units, an attempt is made to acquire a logo mark necessary for the system.

The example of FIG. 5 shows a case where the logo mark is acquired using the remaining two systems because one of the three systems is being viewed.
As a starting condition for acquiring the logo mark, the logo mark data is stored in the logo mark memory 25 even though it is registered in the reception table 23 of the storage unit 22 as a channel that can be received by channel scanning. The case where there is no is mentioned.
Even if the logo mark data is stored, if it is recognized that the version of the logo mark data is old, it is determined that the data needs to be updated. The system control unit 21 compares the acquired logo mark version information with the latest logo mark version information obtained from the current broadcast wave broadcast information, and recognizes that the acquired logo mark version is old. In such a case, there is a method of setting a flag for updating the logo mark for each channel.
First, when the system control unit 21 instructs the channel selection control unit 5 to scan for broadcast station logo mark acquisition and the channel selection control unit 5 starts acquiring the broadcast station logo mark (step S201), first, the three tuner units 2 are scanned. -4 are checked to see if the tuner status is usable, and the usable tuner status is acquired (step S202). In this case, since the first tuner section 2 is being viewed and the second and third tuner sections 3 and 4 are usable, the usable number T is 2.

Next, the channel selection control unit 5 looks at the logo mark memory 25 of the storage unit 22 and searches for the number of channels that need to acquire the broadcast station logo mark (step S203). In this case, it is assumed that the channels for which the logo mark needs to be acquired are 15 ch, 16 ch, 21 ch, 28 ch, and 35 ch.
The channels that need to acquire the logo mark are 15ch, 16ch, 21ch, 28ch, and 35ch, which are two usable second and third tuner units (step S204). 15ch, 16ch, 21ch are allocated to the second tuner unit 3 and 28ch, 35ch are allocated to the third tuner unit 4, and a tuning instruction is given to each tuner unit (step S205).

Then, the second tuner unit 3 starts a scanning operation for logo mark acquisition in response to the channel selection command from the channel selection control unit 5, and first sets the channel initial value (step S206). In this case, the ch initial value is 15 ch.
Next, the second tuner unit 3 performs channel selection of the 15ch channel (step S207), and receives a broadcast wave including logo mark information of the broadcast station, which is one of the broadcast information of the 15ch channel.
The second demultiplexing unit 7 acquires logo mark information from the received signal (step S208), and the logo mark information is stored in the logo mark memory 25 of the storage unit 22 by the system control unit 21 (step S209). In the unlikely event that the broadcast wave of the channel cannot be received due to a stoppage or the like, it is desirable to end the processing of the channel due to a timeout.

Next, the second tuner unit 3 performs channel up (step S210), executes channel selection of the 16ch channel, and transmits a broadcast wave including the logo mark information of the broadcast station, which is one of the broadcast information of the 16ch channel. Receive.
The second demultiplexing unit 7 acquires logo mark information from the received signal (step S208), and the logo mark information is stored in the logo mark memory 25 of the storage unit 22 by the system control unit 21 (step S209).
Thus, when the program information acquisition scan for the last channel of 21ch is completed (step S211), the logo mark information acquisition scan in the second tuner unit 3 ends.

  Similarly to the second tuner unit 3, the third tuner unit 4 is scanned for logo mark information acquisition according to the procedure from step S 212 to step S 217. In the case of the third tuner section 4, the ch initial value is 28 ch and the last channel is 35 ch.

  Thus, when the scanning of the two systems, that is, the second and third tuner units 3 and 4 is completed, the entire logo mark information acquisition scanning operation is completed (step S218).

  As described above, when it is recognized that the logo mark data has not been acquired, the logo mark information is acquired if there is a paused system among the three tuner units. If a plurality of tuner units can be used, the logo mark information acquisition operation can be completed in a short time by sharing the channels to be acquired.

Embodiment 2. FIG.
FIG. 6 is a block diagram showing the configuration of the digital broadcast receiving system according to the second embodiment of the present invention.
In FIG. 6, in the second embodiment of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and the description of the overlapping configurations is omitted.
In this second embodiment, the tuner unit has two systems, and a plurality of viewers do not view different channels at the same time, but while viewing a program of one channel on one display unit, It is configured for the purpose of recording a program (for example, a back program).

In the second embodiment, a recording / playback switching unit 26 is provided between the first and second demultiplexing units 6 and 7 and the first decoding unit 10. The recording / playback switching unit 26 switches the flow of the recording / playback signal, sends the broadcast wave signal from the first tuner unit 2 to the decoding unit 10, and transmits the broadcast wave signal from the second tuner unit 2. Has the function of blocking. Therefore, only the first decoding unit 10 is provided, and the second decoding unit 11 as in Embodiment 1 is not provided. There is also one display unit 18.
The recording / reproducing switching unit 26 is connected to a recording unit 27 for recording / reproducing broadcast signals. The recording / reproducing switching unit 26 and the recording unit 27 are controlled by a recording / reproducing control unit 28.

  In the second embodiment, when the recording / playback switching unit 26 sets recording (recording) by the recording / playback control unit 28, for example, a broadcast wave to which program information of a certain channel received by the first tuner unit 2 is added. When viewing the broadcast content on the display unit 16, the broadcast content of the broadcast wave to which the program information of the channel different from the first tuner unit 2 received by the second tuner unit 3 is added is recorded in the recording unit 27 ( Recorded).

  Further, when the recording / playback switching unit 26 sets the reproduction by the recording / playback control unit 28, the broadcast wave signal received by the first tuner unit 2 is blocked from flowing to the decoding unit 10. Then, the recording / reproducing control unit 28 operates the recording unit 27, and the broadcast content of the broadcast wave received by the second tuner unit 3 recorded (recorded) in the recording unit 27 is reproduced and displayed on the display device 16. The Rukoto.

Also in this second embodiment, when the recording / playback control unit 28 sets the recording / playback switching unit 26 to block the broadcast wave signal from the second tuner unit 2, the first tuner unit 2 receives it. Since the system of the second tuner unit 3 and the second demultiplexing unit 7 is not used for recording when the broadcast content of the broadcast wave is viewed on the display unit 16, the channel selection is performed as in the first embodiment. Can be performed to obtain necessary channel information, program information, and logo mark.
Further, when the program is not viewed on the display unit 18, the first and second tuner units 2 and 3 and the first and second demultiplexing units 6 and 7 respectively perform the same as in the first embodiment. It is possible to perform the operation of acquiring the necessary channel information, program information and logo mark by scanning the channel selection.

As described above, there are two tuner units, the broadcast content of the broadcast wave received by one tuner unit is displayed and viewed on the display unit 18, and the broadcast content of the broadcast wave received by the other tuner unit is recorded. If the broadcast contents of the broadcast wave received by the other tuner unit are not recorded when the other tuner unit is enabled, the channel selection scan is performed based on the broadcast wave received by the other tuner unit, and necessary channel information and program information are obtained. In addition, the operation of acquiring the logo mark can be performed.
Further, when the display unit 18 does not view a program, the channel selection scan is performed by the two tuner units and the demultiplexing unit in the same manner as in the first embodiment to obtain necessary channel information and program information. Acquisition and logo mark acquisition operations can be performed.
Although FIG. 6 shows an example in which two tuner units are mounted, it goes without saying that a higher speed effect can be expected in a receiving system apparatus having three or more systems.

  As an application example of the present invention, it is effective to apply to a digital broadcast receiver, particularly a high-function receiver capable of recording a back program, and a home server digital broadcast receiver in the home.

It is a block diagram which shows the structure of the digital broadcast receiving system of Embodiment 1 of this invention. It is a block diagram which shows the structure of the memory | storage part of the digital broadcast receiving system. It is the flowchart which showed the operation | movement of the channel scan in the digital broadcast receiving system. It is the flowchart which showed the operation | movement of the program information acquisition in the digital broadcast receiving system. It is the flowchart which showed the operation | movement of the broadcast station logo mark data acquisition in the digital broadcast receiving system. It is a block diagram which shows the structure of the digital broadcast receiving system of Embodiment 2 of this invention.

Explanation of symbols

2 1st tuner part 3 2nd tuner part 4 3rd tuner part 5 channel selection control part 6 1st demultiplexing part 7 2nd demultiplexing part 8 3rd demultiplexing part , 9 Demultiplexing control unit, 21 System control unit, 22 Storage unit.

Claims (1)

A plurality of tuner units that perform reception operation by receiving reception signals of a plurality of channels of broadcast waves to which broadcast information supplied from an antenna is added;
A plurality of demultiplexing units for separating broadcast information and video / audio data from received signals selected by each tuner unit;
A storage unit for storing the acquired information;
Among the broadcast information included in the broadcast wave, a system control unit for instructing scanning so as to perform a scanning operation according to broadcast information such as channel information, program information, or data of a logo mark of a broadcasting station ,
Based on the scan instruction from the system control unit, to go and see whether multiple available states not viewing the tuner unit assigns a plurality of channels to be channel selection for each tuner available A tuning control unit for controlling each tuner unit to receive a reception signal of a channel selected by a scanning operation,
The system control unit stores broadcast information corresponding to a scanning operation acquired by each demultiplexing unit from a received signal of a channel selected by each tuner unit in a corresponding part of the storage unit. Digital broadcast receiving system.

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