DIGITAL BROADCAST RECEIVER

• US 20130136212A1
• Filed: 10/17/2011
• Published: 05/30/2013
• Est. Priority Date: 10/26/2010
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Shirasuka, Keiichi, Matsumoto, Soichiro
• Granted Patent: US 8,837,641 B2
• Time in Patent Office: Days
• US Class Current: 375/340
• CPC Class Codes: H04L 27/00 Modulated-carrier systems
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4263 involving specific tuning arrangements, e.g. two tuners
• CPC Class Codes: H04N 21/4383 Accessing a communication channel
• CPC Class Codes: H04N 5/46 for receiving on more than one standard at will deflecting circuits of multi-standard receivers H04N3/27

Abstract

The present invention provides a digital broadcast receiver which reduces the time needed for channel scans by performing efficient channel scanning when broadcasts in a plurality of broadcast protocols are received. As a first phase channel scan, a first controller and a second controller divide a plurality of channels included in an overlapping frequency band of a first broadcast protocol and a second broadcast protocol, and execute parallel channel scans. After the first phase channel scan, the first controller scans channels in which electrical signals generated from electromagnetic waves received by a second tuner in the first phase channel scan could not be demodulated by a second demodulator, and the second controller scans channels in which electrical signals generated from electromagnetic waves received by a first tuner could not be demodulated by a first demodulator.

Claims

1. A digital broadcast receiver for receiving broadcasts in a first broadcast protocol and a second broadcast protocol that use at least partly overlapping frequency bands, the digital broadcast receiver comprising:

a first tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a first demodulator for demodulating the electrical signal obtained from the first tuner and generating a first digital signal conforming to the first broadcast protocol;

a first demultiplexer for separating first data including tuning information from the first digital signal;

a first controller for controlling the first tuner, the first demodulator, and the first demultiplexer and executing a channel scan in the first broadcast protocol;

a second tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a second demodulator for demodulating the electrical signal obtained from the second tuner and generating a second digital signal conforming to the second broadcast protocol;

a second demultiplexer for separating second data including tuning information from the second digital signal; and

a second controller for controlling the second tuner, the second demodulator, and the second demultiplexer and executing a channel scan in the second broadcast protocol;

wherein

the first controller and the second controller divide between them a plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol and execute channel scans in parallel as a first phase channel scan;

in the first phase channel scan, the first controller executes a channel scan in the first broadcast protocol and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present;

in the first phase channel scan, the second controller executes a channel scan in the second broadcast protocol and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present; and

after the first phase channel scan, the first controller executes a channel scan in the first broadcast protocol on the channels indicated in the second scan use channel list, and the second controller executes a channel scan in the second broadcast protocol on the channels indicated in the first scan use channel list.

2. The digital broadcast receiver of claim 1, wherein:

in the first phase channel scan, the first controller adds, to the first scan use channel list, channels in which digital signals in the first broadcast protocol could not be demodulated despite the presence, in the electrical signal generated from the electromagnetic wave received by the first tuner, of a received level equal to or greater than a predetermined threshold value; and

in the first phase channel scan, the second controller adds, to the second scan use channel list, channels in which digital signals in the second broadcast protocol could not be demodulated despite the presence, in the electrical signal generated from the electromagnetic wave received by the first tuner, of a received level equal to or greater than a predetermined threshold value.

3. The digital broadcast receiver of claim 1, wherein:

in the first phase channel scan, the first controller scans the plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol in ascending order of channel number;

in the first phase channel scan, the second controller scans the plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol in descending order of channel number; and

the first controller and the second controller each terminate the first phase channel scan when the channel to be scanned has already been scanned by the other controller among the first controller and the second controller.

4. The digital broadcast receiver of claim 1, further comprising:

an input unit for receiving input of commands; and

a user interface processor for executing processing corresponding to the commands;

wherein

by executing channel scans, the first and second controllers create service lists from the tuning information; and

the user interface processor generates, and outputs to a display unit, screen signals for a service list screen for receiving input of a service selected from the service list created from either the channel scan of channels included in the frequency band used by the first broadcast protocol or the channel scan of channels included in the frequency band used by the second broadcast protocol, whichever finished first, enabling the service to be selected by the input unit through the service list screen.

5. A digital broadcast receiver for receiving broadcasts in a first broadcast protocol and a second broadcast protocol that use at least partly overlapping frequency bands, the digital broadcast receiver comprising:

a first tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a first demodulator for demodulating the electrical signal obtained from the first tuner and generating a first digital signal conforming to the first broadcast protocol;

a first demultiplexer for separating first data including tuning information from the first digital signal generated by the first demodulator;

a first controller for controlling the first tuner, the first demodulator, and the first demultiplexer and executing a channel scan in the first broadcast protocol;

a second tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a second demodulator for demodulating the electrical signal obtained from the second tuner and generating a second digital signal conforming to the second broadcast protocol;

a second demultiplexer for separating second data including tuning information from the second digital signal generated by the second demodulator; and

a second controller for controlling the second tuner, the second demodulator, and the second demultiplexer and executing a channel scan in the second broadcast protocol;

a third tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a third demodulator for demodulating the electrical signal obtained from the third tuner and generating a first digital signal conforming to the first broadcast protocol;

a third demultiplexer for separating first data including tuning information from the first digital signal generated by the third demodulator; and

a third controller for controlling the third tuner, the third demodulator, and the third demultiplexer and executing a channel scan in the first broadcast protocol;

a fourth tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a fourth demodulator for demodulating the electrical signal obtained from the fourth tuner and generating a second digital signal conforming to the second broadcast protocol;

a fourth demultiplexer for separating second data including tuning information from the second digital signal generated by the fourth demodulator; and

a fourth controller for controlling the fourth tuner, the fourth demodulator, and the fourth demultiplexer and executing a channel scan in the second broadcast protocol;

wherein

the first controller, the second controller, the third controller, and the fourth controller divide among them a plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol and execute channel scans in parallel as a first phase channel scan;

in the first phase channel scan, the first controller executes a channel scan in the first broadcast protocol and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present;

in the first phase channel scan, the second controller executes a channel scan in the second broadcast protocol and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present;

in the first phase channel scan, the third controller executes a channel scan in the first broadcast protocol and generates a third scan use channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present, from information indicating reception status from the third tuner and the third demodulator;

in the first phase channel scan, the fourth controller executes a channel scan in the second broadcast protocol and generates a fourth scan use channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present, from information indicating reception status from the fourth tuner and the fourth demodulator; and

after the first phase channel scan, the first controller and the third controller divide between them the channels indicated in the second scan use channel list and the fourth scan use channel list and execute a channel scan in the first broadcast protocol, and the second controller and the fourth controller divide between them the channels indicated in the first scan use channel list and the third scan use channel list and execute a channel scan in the second broadcast protocol.

6. A digital broadcast receiver for receiving broadcasts in a first broadcast protocol and a second broadcast protocol that use at least partly overlapping frequency bands, the digital broadcast receiver comprising:

a first tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a first demodulator for demodulating the electrical signal obtained from the first tuner and generating a first digital signal conforming to the first broadcast protocol;

a first demultiplexer for separating first data including tuning information from the first digital signal generated by the first demodulator;

a first controller for controlling the first tuner, the first demodulator, and the first demultiplexer and executing a channel scan in the first broadcast protocol;

a second tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a second demodulator for demodulating the electrical signal obtained from the second tuner and generating a second digital signal conforming to the second broadcast protocol;

a second demultiplexer for separating second data including tuning information from the second digital signal generated by the second demodulator; and

a second controller for controlling the second tuner, the second demodulator, and the second demultiplexer and executing a channel scan in the second broadcast protocol;

a third tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a third demodulator for demodulating the electrical signal obtained from the third tuner and generating a first digital signal conforming to the first broadcast protocol;

a third demultiplexer for separating first data including tuning information from the first digital signal generated by the third demodulator; and

a third controller for controlling the third tuner, the third demodulator, and the third demultiplexer and executing a channel scan in the first broadcast protocol;

a fourth tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a fourth demodulator for demodulating the electrical signal obtained from the fourth tuner and generating a second digital signal conforming to the second broadcast protocol;

a fourth demultiplexer for separating second data including tuning information from the second digital signal generated by the fourth demodulator; and

a fourth controller for controlling the fourth tuner, the fourth demodulator, and the fourth demultiplexer and executing a channel scan in the second broadcast protocol;

wherein

when the second tuner, the second demodulator, and the second demultiplexer are being used to receive a service broadcast in the second broadcast protocol,

the first controller, the third controller, and the fourth controller divide among them a plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol and execute parallel channel scans as a first phase channel scan,

in the first phase channel scan, the first controller executes a channel scan in the first broadcast protocol and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present,

in the first phase channel scan, the third controller executes a channel scan in the first broadcast protocol and generates a third scan use channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present, from information indicating reception status from the third tuner and the third demodulator,

in the first phase channel scan, the fourth controller executes a channel scan in the second broadcast protocol and generates a fourth scan use channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present, from information indicating reception status from the fourth tuner and the fourth demodulator, and

after the first phase channel scan, the first controller and the third controller divide between them the channels indicated in the fourth scan use channel list and execute a channel scan in the first broadcast protocol, and the fourth controller executes a channel scan in the second broadcast protocol the channels indicated in the first scan use channel list and the third scan use channel list; and

when the first tuner, the first demodulator, and the first demultiplexer are being used to receive a service broadcast in the first broadcast protocol,

the second controller, the third controller, and the fourth controller divide among them a plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol and execute parallel channel scans as a fourth phase channel scan,

in the fourth phase channel scan, the second controller executes a channel scan in the second broadcast protocol and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present;

in the fourth phase channel scan, the third controller executes a channel scan in the first broadcast protocol and generates a third scan use channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present, from information indicating reception status from the third tuner and the third demodulator,

in the fourth phase channel scan, the fourth controller executes a channel scan in the second broadcast protocol and generates a fourth scan use channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present, from information indicating reception status from the fourth tuner and the fourth demodulator, and

after the fourth phase channel scan, the third controller executes a channel scan in the first broadcast protocol on the channels indicated in the second scan use channel list and the fourth scan use channel list, and the second controller and the fourth controller divide between them the channels indicated in the third scan use channel list and execute a channel scan in the second broadcast protocol.

7. A digital broadcast receiver for receiving broadcasts in a first broadcast protocol and a second broadcast protocol that use at least partly overlapping frequency bands, the digital broadcast receiver comprising:

a first tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a first demodulator for demodulating the electrical signal obtained from the first tuner and generating a first digital signal conforming to the first broadcast protocol;

a first demultiplexer for separating first data including tuning information from the first digital signal;

a first controller for controlling the first tuner, the first demodulator, and the first demultiplexer and executing a channel scan in the first broadcast protocol;

a second tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a second demodulator for demodulating the electrical signal obtained from the second tuner and generating a second digital signal conforming to the second broadcast protocol;

a second demultiplexer for separating second data including tuning information from the second digital signal; and

a second controller for controlling the second tuner, the second demodulator, and the second demultiplexer and executing a channel scan in the second broadcast protocol;

wherein

the first controller and the second controller divide between them a plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol and execute channel scans in parallel as a first phase channel scan;

in the first phase channel scan, the first controller executes a channel scan in the first broadcast protocol and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present;

in the first phase channel scan, the second controller executes a channel scan in the second broadcast protocol and generates a second scan use channel list indicating channels in which the electrical signal generated from the electromagnetic wave received by the second tuner could be demodulated and, from information indicating reception status from the second tuner and the second demodulator, channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present; and

after the first phase channel scan, the first controller executes a channel scan in the first broadcast protocol on the channels indicated in the second scan use channel list, and the second controller executes a channel scan in the second broadcast protocol on the channels indicated in the first scan use channel list.

8. The digital broadcast receiver of claim 7, wherein the second controller restricts the channels stored in the second scan use channel list to channels in which the electromagnetic wave received by the second tuner has a received level exceeding a first threshold value.

9. A digital broadcast receiver for receiving broadcasts in a first broadcast protocol, a second broadcast protocol, and a third broadcast protocol that use at least partly overlapping frequency bands, the digital broadcast receiver comprising:

a first tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a first demodulator for demodulating the electrical signal obtained from the first tuner and generating a first digital signal;

a first demultiplexer for separating first data including tuning information from the first digital signal;

a first controller for controlling the first tuner, the first demodulator, and the first demultiplexer and executing channel scans in the first broadcast protocol and the third broadcast protocol;

a second tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a second demodulator for demodulating the electrical signal obtained from the second tuner and generating a second digital signal;

a second demultiplexer for separating second data including tuning information from the second digital signal; and

a second controller for controlling the second tuner, the second demodulator, and the second demultiplexer and executing channel scans in the second broadcast protocol and the third broadcast protocol;

wherein

the first controller and the second controller divide between them a plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol and execute the channel scan in the first broadcast protocol and the channel scan in the second broadcast protocol in parallel as a first phase channel scan;

in the first phase channel scan, the first controller executes a channel scan in the first broadcast protocol and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present;

in the first phase channel scan, the second controller executes a channel scan in the second broadcast protocol and generates, from information indicating reception status from the second tuner and the second demodulator a second scan use channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present; and

as channel scans after the first phase channel scan,

the first controller executes a channel scan in the first broadcast protocol on the channels indicated in the second scan use channel list, and generates, from information indicating reception status from the first tuner and the first demodulator, a third scan use first channel list indicating channels identified as channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present,

the second controller executes a channel scan in the second broadcast protocol on the channels indicated in the first scan use channel list, and generates, from information indicating reception status from the second tuner and the second demodulator, a third scan use second channel list indicating channels identified as channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present, and

at least one of the first controller and the second controller executes a channel scan in the third broadcast protocol on the channels indicated in the third scan use first channel list and the third scan use second channel list.

10. The digital broadcast receiver of claim 9, wherein:

in the first phase channel scan, the first controller scans the plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol in ascending order of channel number;

in the first phase channel scan, the second controller scans the plurality of channels included in the overlapping frequency band of the first broadcast protocol and the second broadcast protocol in descending order of channel number; and

the first controller and the second controller each terminate the first phase channel scan when the channel to be scanned has already been scanned by the other controller among the first controller and the second controller.

11. A digital broadcast receiver for receiving broadcasts in a first broadcast protocol, a second broadcast protocol, and a third broadcast protocol that use at least partly overlapping frequency bands, the digital broadcast receiver comprising:

a first tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a first demodulator for demodulating the electrical signal obtained from the first tuner and generating a first digital signal;

a first demultiplexer for separating first data including tuning information from the first digital signal;

a first controller for controlling the first tuner, the first demodulator, and the first demultiplexer and executing channel scans in the first broadcast protocol and the third broadcast protocol;

a second tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a second demodulator for demodulating the electrical signal obtained from the second tuner and generating a second digital signal;

a second demultiplexer for separating second data including tuning information from the second digital signal; and

a second controller for controlling the second tuner, the second demodulator, and the second demultiplexer and executing channel scans in the second broadcast protocol and the third broadcast protocol;

wherein

the first controller and the second controller divide between them a plurality of channels included in one of the frequency bands of the first broadcast protocol, the second broadcast protocol, and the third broadcast protocol and execute channel scans in parallel in the third broadcast protocol as a first phase channel scan;

in the first phase channel scan, the first controller executes a channel scan in the third broadcast protocol and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use first channel list indicating channels in which a broadcast wave not belonging to the third broadcast protocol is likely to be present, and

in the first phase channel scan, the second controller executes a channel scan in the third broadcast protocol and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use first channel list indicating channels in which a broadcast wave not belonging to the third broadcast protocol is likely to be present; and

as a second phase channel scan,

the first controller executes a channel scan in the first broadcast protocol on the channels indicated in the first scan use first channel list, and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use second channel list indicating channels identified as channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present, and

the second controller executes a channel scan in the second broadcast protocol on the channels indicated in the second scan use first channel list, and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use second channel list indicating channels identified as channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present; and

as a third-phase channel scan,

the first controller executes the channel scan in the first broadcast protocol on the channels indicated in the second scan use second channel list, and

the second controller executes the channel scan in the second broadcast protocol on the channels indicated in the first scan use second channel list.

12. The digital broadcast receiver of claim 11, wherein:

in the first phase channel scan, the first controller scans the plurality of channels included in one of the frequency bands of the first broadcast protocol, the second broadcast protocol, and the third broadcast protocol in ascending order of channel number;

in the first phase channel scan, the second controller scans the plurality of channels included in one of the frequency bands of the first broadcast protocol, the second broadcast protocol, and the third broadcast protocol in descending order of channel number; and

the first controller and the second controller each terminate the first phase channel scan when the channel to be scanned has already been scanned by the other controller among the first controller and the second controller.

13. A digital broadcast receiver for receiving broadcasts in a first broadcast protocol, a second broadcast protocol, a third broadcast protocol, and a fourth broadcast protocol that use at least partly overlapping frequency bands, the digital broadcast receiver comprising:

a first tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a first demodulator for demodulating the electrical signal obtained from the first tuner and generating a first digital signal;

a first demultiplexer for separating third data and first data including tuning information from the first digital signal;

a first controller for controlling the first tuner, the first demodulator, and the first demultiplexer and executing channel scans in the first broadcast protocol and the third broadcast protocol;

a second tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a second demodulator for demodulating the electrical signal obtained from the second tuner and generating a second digital signal;

a second demultiplexer for separating third data and second data including tuning information from the second digital signal; and

a second controller for controlling the second tuner, the second demodulator, and the second demultiplexer and executing channel scans in the second broadcast protocol and the fourth broadcast protocol;

wherein

the first controller and the second controller divide between them a plurality of channels included in the overlapping frequency bands of the first broadcast protocol, the second broadcast protocol, the third broadcast protocol, and the fourth broadcast protocol and execute a channel scan in the first broadcast protocol and a channel scan in the second broadcast protocol in parallel as a first phase channel scan;

in the first phase channel scan, the first controller executes the channel scan in the first broadcast protocol and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use first channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present, and

in the first phase channel scan, the second controller executes the channel scan in the second broadcast protocol and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use first channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present;

as a second phase channel scan,

the first controller executes a channel scan in the first broadcast protocol on the channels indicated in the second scan use first channel list, and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use second channel list indicating channels identified as channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present, and

the second controller executes a channel scan in the second broadcast protocol on the channels indicated in the first scan use first channel list, and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use second channel list indicating channels identified as channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present;

as a third-phase channel scan,

the first controller executes a channel scan in the third broadcast protocol on the channels indicated in the second scan use second channel list, and generates, from information indicating reception status from the first tuner and the first demodulator, a third scan use channel list indicating channels identified as channels in which a broadcast wave not belonging to the third broadcast protocol is likely to be present, and

the second controller executes a channel scan in the fourth broadcast protocol on the channels indicated in the first scan use second channel list, and generates, from information indicating reception status from the second tuner and the second demodulator, a fourth scan use channel list indicating channels identified as channels in which a broadcast wave not belonging to the fourth broadcast protocol is likely to be present; and

as a fourth-phase channel scan,

the first controller executes a channel scan in the third broadcast protocol on the channels indicated in the fourth scan use channel list, and

the second controller executes a channel scan in the fourth broadcast protocol on the channels indicated in the third scan use channel list.

14. A digital broadcast receiver for receiving broadcasts in a first broadcast protocol, a second broadcast protocol, a third broadcast protocol, and a fourth broadcast protocol that use at least partly overlapping frequency bands, the digital broadcast receiver comprising:

a first tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a first demodulator for demodulating the electrical signal obtained from the first tuner and generating a first digital signal;

a first demultiplexer for separating third data and first data including tuning information from the first digital signal;

a first controller for controlling the first tuner, the first demodulator, and the first demultiplexer and executing channel scans in the first broadcast protocol and the third broadcast protocol;

a second tuner for receiving an electromagnetic wave and generating an electrical signal from the electromagnetic wave;

a second demodulator for demodulating the electrical signal obtained from the second tuner and generating a second digital signal;

a second demultiplexer for separating third data and second data including tuning information from the second digital signal; and

a second controller for controlling the second tuner, the second demodulator, and the second demultiplexer and executing channel scans in the second broadcast protocol and the fourth broadcast protocol;

wherein

the first controller and the second controller divide between them a plurality of channels included in the overlapping frequency bands of the first broadcast protocol, the second broadcast protocol, the third broadcast protocol, and the fourth broadcast protocol and execute a channel scan in the first broadcast protocol and a channel scan in the second broadcast protocol in parallel as a first phase channel scan;

in the first phase channel scan, the first controller executes a channel scan in the first broadcast protocol and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use first channel list indicating channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present, and

in the first phase channel scan, the second controller executes a channel scan in the second broadcast protocol and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use first channel list indicating channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present;

as a second phase channel scan,

the first controller executes a channel scan in the first broadcast protocol on the channels indicated in the second scan use first channel list, and generates, from information indicating reception status from the first tuner and the first demodulator, a first scan use second channel list indicating channels identified as channels in which a broadcast wave not belonging to the first broadcast protocol is likely to be present, and

the second controller executes a channel scan in the second broadcast protocol on the channels indicated in the first scan use first channel list, and generates, from information indicating reception status from the second tuner and the second demodulator, a second scan use second channel list indicating channels identified as channels in which a broadcast wave not belonging to the second broadcast protocol is likely to be present;

as a third-phase channel scan,

the first controller executes a channel scan in the third broadcast protocol on the channels indicated in the second scan use second channel list, and generates, from information indicating reception status from the first tuner and the first demodulator, a third scan use channel list indicating channels identified as channels in which a broadcast wave not belonging to the third broadcast protocol is likely to be present, and

the second controller executes a channel scan in the third broadcast protocol on the channels indicated in the first scan use second channel list, and generates, from information indicating reception status from the second tuner and the second demodulator, a fourth scan use channel list indicating channels identified as channels in which a broadcast wave not belonging to the third broadcast protocol is likely to be present; and

as a fourth-phase channel scan,

the first controller executes a channel scan in the fourth broadcast protocol on the channels indicated in the fourth scan use channel list, and

the second controller executes a channel scan in the fourth broadcast protocol on the channels indicated in the third scan use channel list.