JP2008136069A - Automatic channel switching system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means capable of automatically switching a channel to an affiliated broadcasting with a comparatively simple configuration when a broadcasting area changes. <P>SOLUTION: Data broadcast such as news, weather forecast, traffic information and program-related information, in one-segment broadcasting to be transmitted by being mixed with a part of a terrestrial digital broadcasting signal is transmitted by adding broadcasting channel information required for automatic channel switching, on the other hand, a terminal corresponding to terrestrial digital broadcast checks a receiving state of radio wave of a broadcasting station received at present, when radio wave of a broadcasting station of the same station seriation of different areas by a second receiving part 22 which receives the one-segment broadcasting is received, checks the receiving state of the radio wave of the broadcasting station of the same station seriation and thus, the receiving states of the two radio waves are compared with each other to select a broadcasting station with better receiving state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an automatic channel switching method when moving to a different broadcast area while receiving a broadcast by a mobile terminal device capable of receiving terrestrial digital broadcasting or one-segment broadcasting, such as a mobile phone, a car navigation system, a personal computer, and a dedicated portable TV. .

  In mobile digital broadcast receivers such as mobile terminal devices that can receive terrestrial digital broadcasts, if the area of the broadcast station changes due to movement of the mobile digital broadcast receiver accompanying the movement of the user, the receiving broadcast station As a result, the reception condition from the TV deteriorates and the radio waves of the original broadcasting station cannot be received. This is because terrestrial digital broadcasting is serviced by a plurality of broadcasting stations, so that the reception channel changes when entering a different broadcasting station area.

  For this reason, conventional terrestrial digital broadcast compatible terminal devices allow users to view digital terrestrial broadcasts by registering broadcast stations in the channel list using automatic channel settings. In order to achieve this, there is a problem in that it is necessary to register a broadcasting station satisfying a certain threshold value in the channel list by automatic channel setting, and the user has to reset the receiving channel.

  For example, in Patent Document 1, in a digital broadcast transmission / reception system to which a transport stream (TS) defined in MPEG-2 Systems is applied as a broadcast signal, a broadcast station arranged in each service area is connected to the service area of the broadcast station. A group of services (programs), transport streams and / or networks associated as an alternative relationship of services when moving from one service area to another service area are grouped as a bouquet and included in the transport stream for transmission and reception The apparatus receives a plurality of services (programs) grouped as a bouquet, a transport stream and / or a transport stream including control information indicating a network, and the received service based on the control information. By managing a plurality of services (programs), transport streams and / or networks associated with services (programs) as an alternative relationship, services (programs) that were viewed before the service area was switched It is possible to automatically switch to a service (program) to be replaced after the area is switched, or to display a list of services (programs) grouped by bouquet on the monitor, so that reconfiguration work can be performed Techniques for facilitating are described.

  In Patent Document 2, first and second receiving units that receive a broadcast, a digital demodulation unit that demodulates the received broadcast into a transport stream, and a separation unit that separates a separated output signal from the transport stream, A storage unit for storing a switching condition designated in advance for switching the separated output signal, and a broadcast for receiving the separated output signal by a first receiving unit separated by the separating unit based on the switching condition Is switched from the first output signal that is the output signal of the broadcast to the second output signal that is the broadcast output signal specified in advance by the user that is received by the first or second receiving unit that is separated by the separation unit By providing the switching unit, the search time for the search target broadcast can be shortened, and the broadcast can be automatically switched quickly.

JP 2002-141877 A JP 2006-080758 A

  In the invention described in Patent Document 1, when a service having an alternative relationship between adjacent service areas is received because the service area has been exceeded, the bouquet ID with reference to the bouquet type is referred to, and the service ID and TS- In order to extract the id, and then search the access list for a transport stream having the same destination area code, extract the frequency, mode, and guard interval from there, and start reception. The area code of the area is input by some means (for example, GPS), and information on the affiliated station set as default (frequency channel, guard interval, TS-id, etc.) is acquired from the access list, and the affiliated station In order to perform reception, it is necessary to register such information in advance. Setting work for the also required.

  Also in the invention described in Patent Document 2, it is necessary to store in the storage unit a switching condition specified in advance for switching the separated output signal, or a regional reception channel table of broadcast channels that can be received for each region. Since it is necessary to measure and register the current position information of the receiving device, the configuration becomes complicated and setting work for that is also required.

  In view of the above problems, an object of the present invention is to provide means capable of realizing automatic switching to series broadcasting with a relatively simple configuration when a broadcasting area changes.

  The auto channel switching method of the present invention is a broadcasting station that transmits a transform stream including a program broadcast and a data broadcast in the area of its own station as a broadcast radio wave, and receives the broadcast radio wave transmitted from the broadcast station, The mobile station comprises a mobile radio terminal capable of reproducing programs and data, and the broadcast station has means for adding the channel information of the local station and other stations that are broadcasting in the area and transmitting the data broadcast. The mobile radio terminal selects a desired broadcast station channel and receives a broadcast radio wave from the broadcast station, and the area while receiving the broadcast radio wave from the desired broadcast station. A second receiving unit that sequentially selects and receives channels other than the broadcast channel, and the second receiving unit receives a broadcast radio wave from a broadcasting station in an adjacent area. Channel information extraction means for extracting the channel information in the adjacent area included in the wave, and broadcast of the same series as the desired broadcast station being received from the channel information extracted by the channel information extraction means Sequence channel detecting means for detecting and outputting station channel information, and receiving the broadcast signal from the desired broadcast station while the second receiving unit sequentially selects and receives channels other than the broadcast channel in the area. Channel search means for controlling the second receiving section to receive the same series of broadcast station channels when the same series of broadcast station channel information is input from the series channel detection means. The radio wave reception status of the broadcasting station of the same series received by the second receiving unit and the location being received by the first receiving unit. The reception status comparison means for comparing the radio wave reception status of the broadcast station of the desired broadcast station, and the radio wave reception status of the broadcast station received by the second reception unit by the reception status comparison means of the desired broadcast station currently being received Channel switching means for switching the reception channel of the first reception unit to the channel of the broadcast station received by the second reception unit when it is determined that the radio wave reception condition is better. It is characterized by that.

  The broadcast radio wave transmitted from the broadcast station is terrestrial digital broadcast, and the broadcast station channel information is added to the data broadcast for one-segment broadcast included in a part of the terrestrial digital broadcast signal and transmitted. be able to.

  The first receiving unit in the mobile radio terminal is configured by a receiving unit capable of receiving a terrestrial digital broadcast transmitted from the broadcast station or a one-segment broadcast included in a part of the terrestrial digital broadcast signal. In addition, the second receiving unit can be realized by a receiving unit capable of receiving one-segment broadcasting regardless of the configuration of the terminal device.

  The broadcast station channel information includes the frequency, station name, and channel number of the broadcast station that is broadcasting in the area.

  That is, in the present invention, broadcast station channel information necessary for auto channel switching is added to data broadcasting such as news, weather forecasts, traffic information, and program related information in one-segment broadcasting that is transmitted mixed with a part of the terrestrial digital broadcasting signal. On the other hand, the terrestrial digital broadcast compatible terminal device checks the reception status of the radio wave of the currently receiving broadcast station, and uses the second reception unit that receives the one-segment broadcast, When the radio waves of the broadcasting station are received, the reception status of the radio waves of the broadcasting stations of the same station series is checked to compare the reception status of these two radio waves and select a broadcasting station with a good reception status.

  At this time, when selecting a broadcasting station in a different area, since the automatic channel switching is performed based on the channel information of the moving destination broadcasting station received in the one-segment data broadcasting, the regional reception of the broadcasting channel that can be received for each region It is not necessary to store the channel table in the storage unit, and the broadcasting station can be automatically switched without interrupting the video being received so far.

  In addition, since 1Seg broadcasting is transmitted at a relatively low bit rate, it can be received with high sensitivity, and the 1Seg broadcasting radio waves of broadcasting stations in adjacent areas can also be received relatively easily. While receiving the digital wave broadcasting, it is possible to easily detect the broadcasting station channel information of the same series as the receiving broadcasting station in the adjacent area. Therefore, even when the terminal for digital terrestrial broadcasting enters a different broadcasting station area and the receiving channel changes, it is possible to automatically set the channel and continuously watch the broadcast.

  In the present invention, when moving from an existing broadcasting station area to a broadcasting station area with a different channel, the channel information in the different broadcasting station area obtained from broadcasting radio waves received in the vicinity of the different broadcasting station area is used for the different broadcasting. By sequentially searching for broadcast channels in the station area, it is possible to determine the broadcast station of the same series as the currently receiving broadcast station and perform auto channel switching, so the user does not have to reset the receive channel It is possible to view the same broadcast without interruption.

  The channel information in the broadcasting station area is added to the one-seg broadcasting data broadcast included in a part of the terrestrial digital broadcast signal and transmitted to receive the terrestrial digital broadcast in the current area. In the adjacent area, the broadcasting station channel information of the same series as the receiving broadcasting station can be easily detected, and the receiving channel has changed in a different broadcasting station area in the terrestrial digital broadcasting compatible terminal device. Even in this case, it is possible to easily set the channel automatically and continuously watch the broadcast.

  FIG. 1 is a schematic diagram showing an example of a broadcasting station area of terrestrial digital broadcasting to which the present invention is applied. The terrestrial digital broadcast compatible terminal device 10 has a function of receiving terrestrial digital broadcasts, and receives radio waves of terrestrial digital broadcasts from broadcast station antennas arranged in each area while moving in the broadcast station area. By doing so, it is possible to view digital terrestrial broadcasting. The broadcast station antenna 1 and the broadcast station antenna 2 are broadcast station antennas for terrestrial digital broadcasting in the respective areas. Program broadcasts (video and audio) and data broadcasts are transmitted from the respective broadcast station antennas.

  FIG. 2 shows a transmission format of a one-segment broadcasting transform stream (hereinafter referred to as TS) included in a part of the terrestrial digital broadcasting showing the embodiment of the present invention.

  In the transmission format of one-segment broadcasting included in a part of the conventional digital terrestrial broadcasting signal, the broadcasting station antenna 1 or 2 has a program broadcasting including video and audio signals, news, weather, and traffic in each area. In this embodiment, as shown in FIG. 2, a data broadcast of information, program related information, etc. is transmitted to the data broadcast area of this conventional transform stream. It is characterized by the addition of broadcast station channel information such as frequency, station name, and channel number.

  The terrestrial digital broadcast compatible terminal device 10 searches for reception status of one-seg radio waves in different broadcast station areas in addition to radio waves in the current broadcast station area while moving while receiving a desired broadcast station channel in the area. At this time, if radio waves in a different broadcast station area can be received in addition to radio waves in the current broadcast station area, it is predicted that the radio station will move into this different broadcast station area in the future. The channel information included in the data broadcasting area of the one-segment broadcasting is extracted, and the channels assigned to the different broadcasting station areas are received based on the extracted channel information.

  When a broadcast station channel of the same series as the desired broadcast station channel currently being received is received among the received channels, the reception status of radio waves in the broadcast station area currently being received is different from the broadcast station channel. Compares the reception status of radio waves from affiliated broadcast stations in the area, and if the reception status of the radio station area is different from that of the current broadcast station area, auto channel switching is performed based on this reception channel information To do.

  In the terrestrial digital broadcast compatible terminal device 10, for example, domestic terrestrial digital broadcast station names, broadcast frequencies and channel numbers of the respective broadcast stations are stored together as a table for each broadcast station of the same series. Thus, it is possible to easily identify whether or not the received one-segment radio wave is a radio wave from the same series of broadcasting stations. Therefore, when channel information of a broadcasting station of the same series as the currently receiving broadcasting station is detected from channel information included in the data broadcasting area of the one-segment broadcasting in a different broadcasting station area, the detected The reception status can be compared by selecting a broadcasting station.

  FIG. 3 is a schematic block diagram of a portion related to the present invention of the terrestrial digital broadcast compatible terminal device showing the embodiment of the present invention.

  In FIG. 3, the digital broadcast receiving unit 12 receives a channel switching signal set by the user via the channel switching processing unit 15 and is broadcast from a desired broadcasting station in the area where the terminal device is currently located. The digital wave broadcast is received via the antenna 11, the demodulator 13 demodulates the TS signal from the received signal, and the video / audio / data reproduction unit 14 reproduces video, audio, and data from the demodulated TS signal. This makes it possible to view a desired program.

  On the other hand, the one-seg broadcast receiving unit 22 is controlled by the channel search unit 26 while the digital broadcast receiving unit 12 is receiving a terrestrial digital broadcast broadcast from a desired broadcast station in the area where the terminal device is currently located. Then, a search is made as to whether or not a one-segment broadcasting radio wave of a broadcasting station area different from the current broadcasting station area can be received, and when the one-seg broadcasting radio wave of a different broadcasting station area can be received via the antenna 21, the demodulator 23 performs the one-seg broadcasting. The channel information added to the data broadcasting area of the one-segment broadcasting is extracted by the channel information extracting unit 24 and output to the sequence channel detecting unit 25.

  The sequence channel detection unit 25 detects a channel of the same sequence as the channel being received by the digital broadcast reception unit 12 in the current area in the channel information in the different broadcast station areas extracted by the channel information extraction unit 24. The detected channel information is sent to the channel search unit 26. When the channel search unit 26 receives from the sequence channel detection unit 25 channel information of the same series as the channel being received by the digital broadcast reception unit 12 in the current area, the channel search unit 26 sends a digital broadcast reception unit to the one-segment broadcast reception unit 22. The digital broadcast receiving unit 12 received from the current channel and the channel detecting unit 25 receives the same channel as the channel being received, and the radio wave reception status of each channel is sent to the received radio wave comparing unit 16. Control to send.

  The reception radio wave comparison unit 16 receives the radio wave reception status of the channel currently received by the digital broadcast reception unit 12 and the digital broadcast reception unit 12 received from the sequence channel detection unit 25 received by the one-segment broadcast reception unit 22. The radio wave reception statuses of channels of the same series as the channel are compared, and the comparison result is sent to the received radio wave selection unit 17. Based on the information of the received radio wave comparison unit 16, the received radio wave selection unit 17 sends a signal to the channel switching processing unit 15 for selecting a broadcast station with good radio wave reception status in the broadcast station area different from the radio wave in the current broadcast station area Output.

  Therefore, when the radio wave reception status of the current broadcasting station area is better, the channel switching processing unit 15 controls the digital broadcast receiving unit 12 so as to maintain and receive the channel currently being received, which is different. When the radio wave reception status in the broadcasting station area is better, the channel switching processing unit 15 controls the digital broadcast receiving unit 12 to receive the same series of channels detected by the series channel detecting unit 25. To switch the auto channel.

  FIG. 4 is a schematic diagram showing a state when the terrestrial digital broadcast compatible terminal device of the present embodiment searches for radio waves in different broadcast station areas.

  In FIG. 4, the terrestrial digital broadcast compatible terminal device 10 searches the reception status of the radio wave with the one-segment broadcast receiving unit 22 to determine whether or not radio waves in different broadcast station areas other than the radio wave in the current broadcast station area can be received. At this time, when radio waves in different broadcast station areas can be received in addition to radio waves in the current broadcast station area, the reception channel information included in the one-segment data broadcast in the different broadcast station areas is extracted and the channel information If there is a channel of the same series as the channel currently being received, the radio wave reception status of both are compared. Then, when the reception status of radio waves in a different broadcast station area is better than the radio waves in the current broadcast station area, auto channel switching is performed based on this reception channel information.

  FIG. 5 is a flowchart showing the state of the automatic channel switching process of the terrestrial digital broadcast compatible terminal device of the present embodiment. Hereinafter, the operation of this embodiment will be described.

  The terrestrial digital broadcast compatible terminal device of the present embodiment checks the reception status of radio waves of the terrestrial digital broadcast station (S1). At this time, if only the radio waves of the broadcasting station in the area currently being viewed can be received, the channel of the currently receiving broadcasting station is maintained (S2: only existing broadcasting stations). On the other hand, when the radio waves of broadcast stations in different broadcast areas can be received in addition to the currently watched broadcast station (S2: other area broadcast station radio wave reception) Channel information of the broadcast station of the current broadcast station, and information such as the reception status of the broadcast wave of the same series as the broadcast station currently being viewed and the reception status of the broadcast wave of the broadcast station currently being viewed is acquired (S3). .

  Based on this information, the reception statuses of the radio waves of the two broadcasting stations are compared, and the one with the better radio wave reception status is selected (S4). At this time, if the radio wave reception status of the broadcast station in the current area is better, the channel of the existing broadcast station is maintained (S5: existing radio wave reception status is good). On the other hand, when the radio wave reception status of broadcasting stations in different areas is better, auto channel switching is performed based on the destination broadcast station channel information necessary for auto channel switching obtained from data broadcasting as shown in FIG. The broadcast station is switched (S6: Other area broadcast station radio wave reception good).

  In this embodiment, the broadcast station channel information of each area is added to the data broadcast area of the transform stream of the one-segment broadcast. Therefore, the broadcast station channel information in each area is realized by a simple one-segment broadcast receiver. Therefore, the auto channel switching mechanism can be realized with a relatively simple configuration.

  In addition, since one-segment broadcasting can increase the reception sensitivity, it is possible to relatively easily receive radio waves from a broadcasting station in an area different from the area where the current position is located. Therefore, it is possible to obtain broadcast station channel information in another area at a relatively early stage before moving to another area, and it is possible to smoothly execute automatic channel switching.

  In the above embodiment, the mobile wireless terminal including the digital broadcast receiving unit 12 capable of receiving terrestrial digital is targeted, but the digital broadcast receiving unit 12 capable of receiving terrestrial digital is used as the one-segment broadcast receiving unit. The present invention can also be applied to a mobile terminal that can receive only one-segment broadcasting.

  In the above embodiment, the broadcasting station channel information of the area is added to the data broadcasting area of the transform stream of the one-segment broadcasting. However, the broadcasting station of the area is added to the data broadcasting area of the transform stream of the terrestrial digital broadcasting. Channel information is added, and the one-segment broadcast receiving unit 22 can also be configured as a receiving unit capable of receiving terrestrial digital broadcasts, and can be equipped with the automatic channel switching means of the present invention to automatically switch broadcasts.

  In that case, it is necessary to provide a digital broadcast receiving unit capable of receiving terrestrial digital instead of the one-segment broadcast receiving unit 22, and in terms of configuration, although it is disadvantageous compared to the above embodiment, the channel Automatic switching can be realized.

It is the schematic which shows the example of the broadcast station area of the terrestrial digital broadcasting to which this invention is applied. It is a transmission format which shows the transform stream of the 1 seg broadcasting used by embodiment of this invention. It is a schematic block diagram of the part relevant to this invention of the terrestrial digital broadcast corresponding | compatible terminal device which shows embodiment of this invention. It is the schematic which shows a mode when the terminal device corresponding to terrestrial digital broadcasting of this embodiment searches the radio wave of a different broadcasting station area. It is a flowchart which shows the mode of the process of the automatic channel switching of the terminal device corresponding to terrestrial digital broadcasting of this embodiment.

Explanation of symbols

1-3 Broadcasting Station Antenna 10 Terrestrial Digital Broadcasting Compatible Terminal Device 11, 21 Antenna 12 Digital Broadcasting Reception Unit 13, 23 Demodulation Unit 14 Video / Audio / Data Playback Unit 15 Channel Switching Unit 16 Received Radio Wave Comparison Unit 17 Received Radio Wave Selection Unit 22 One-Seg Broadcast Reception Unit 24 Channel Information Extraction Unit 25 Sequence Channel Detection Unit 26 Channel Search Unit

Claims (8)

A broadcasting station that transmits a transform stream including a program broadcast and a data broadcast in its own area as a broadcast radio wave, and a mobile radio that can receive the broadcast radio wave transmitted from the broadcast station and reproduce the program and data. A device,
The broadcasting station has means for transmitting by adding the broadcasting station channel information of its own station and other stations that are broadcasting in the area to the data broadcasting,
The mobile radio terminal selects a desired broadcast station channel, receives a broadcast radio wave from the broadcast station, and broadcasts in the area while receiving the broadcast radio wave from the desired broadcast station. A second receiving unit that sequentially selects and receives channels other than the channel, and in the adjacent area included in the broadcast radio wave when the second receiving unit receives a broadcast radio wave from a broadcasting station in the adjacent area. Channel information extracting means for extracting the channel information, and channel information of the same series as the desired broadcast station being received is detected and output from the channel information extracted by the channel information extracting means. While receiving the broadcast radio wave from the desired broadcast station with the affiliated channel detection means, the second receiving unit sequentially selects and receives a channel other than the broadcast channel in the area. And channel search means for switching the second receiving unit to receive the same series of broadcast station channels when the same series of broadcast station channel information is input from the series channel detection means, Reception status comparison means for comparing the radio wave reception status of the same series of broadcast stations received by the second reception unit with the radio wave reception status of the desired broadcast station being received by the first reception unit; When the reception status comparing means determines that the radio wave reception status of the broadcast station received by the second reception means is better than the radio wave reception status of the desired broadcast station currently being received, Channel switching means for switching the receiving channel of the receiving section to the channel of the broadcasting station received by the second receiving means;
Auto channel switching system characterized by having.   The broadcast radio wave transmitted from the broadcast station is terrestrial digital broadcast, and the broadcast station channel information is transmitted by being added to the data broadcast for one-segment broadcast included in a part of the terrestrial digital broadcast signal. The auto channel switching system according to claim 1, wherein:   The mobile radio terminal is a terminal device capable of receiving a terrestrial digital broadcast or a one-segment broadcast included in a part of the terrestrial digital broadcast signal transmitted from the broadcast station, and the second receiving unit is 3. The auto channel switching system according to claim 2, comprising a receiving unit for receiving one-segment broadcasting.   3. The automatic channel switching method according to claim 1, wherein the broadcast station channel information includes a frequency, a station name, and a channel number of a broadcast station that is broadcasting in the area.   5. The auto channel switching system according to claim 1, wherein the mobile radio terminal has means for temporarily holding channel information extracted by the channel information extraction means. 6. A mobile radio terminal adapted to the auto channel switching system according to any one of claims 1 to 4,
A first receiving unit that selects a desired broadcast station channel and receives broadcast radio waves from the broadcast station, and sequentially receives channels other than the broadcast channel in the area while receiving broadcast radio waves from the desired broadcast station A second receiving unit that receives the selected radio wave, and when the second receiving unit receives a broadcast radio wave from a broadcast station in the adjacent area, the channel information in the adjacent area included in the broadcast radio wave is extracted. Channel information extracting means, and sequence channel detecting means for detecting and outputting broadcast station channel information of the same series as the desired broadcast station being received from the channel information extracted by the channel information extracting means, While receiving a broadcast radio wave from the desired broadcast station, the second receiving unit is controlled to sequentially select and receive a channel other than the broadcast channel in the area. Channel search means for switching and controlling the second receiving unit to receive the same series of broadcast station channels when the same series of broadcast station channel information is input from the affiliated channel detection means; and A reception status comparing means for comparing the radio wave reception status of the same series of broadcast stations received by the reception unit with the radio wave reception status of the desired broadcast station being received by the first reception unit; and the reception status comparison When it is determined by the means that the radio wave reception status of the broadcast station received by the second reception unit is better than the radio wave reception status of the desired broadcast station currently being received, the first reception unit A mobile radio terminal comprising: channel switching means for switching a reception channel to a channel of a broadcast station received by the second reception unit. A mobile radio terminal adapted to the auto channel switching system according to claim 2,
A terrestrial digital broadcast receiving unit that selects a desired terrestrial digital broadcast station channel and receives broadcast radio waves from the broadcast station, and other than the broadcast channels in the area while receiving broadcast radio waves from the desired broadcast station One-seg broadcast receiving unit that sequentially selects one terrestrial digital broadcast channel and receives one-seg broadcast included in a part of the terrestrial digital broadcast signal, and broadcast from a broadcasting station in an adjacent area by the one-seg broadcast receiving unit Channel information extraction means for extracting the channel information in the adjacent area included in the one-segment broadcasting radio wave when a radio wave is received, and the channel information being extracted from the channel information extracted by the channel information extraction means Sequence channel detection means for detecting and outputting broadcast station channel information of the same sequence as the desired terrestrial digital broadcast station; While receiving broadcast radio waves from the terrestrial digital broadcasting station, the one-seg broadcast receiving unit is controlled so as to sequentially select and receive channels other than the broadcast channels in the area, and the same channel detection means can detect the same. Channel search means for switching and controlling the one-segment broadcasting reception unit to receive the same-series broadcasting station channel when the broadcasting station channel information of the group is input, and the same-series broadcasting received by the one-seg broadcasting receiving unit The reception status comparing means for comparing the radio wave reception status of the station and the radio wave reception status of the desired broadcast station being received by the terrestrial digital broadcast reception unit, and received by the one-segment broadcast reception unit by the reception status comparison unit When it is determined that the radio wave reception status of the broadcast station is better than the radio wave reception status of the desired broadcast station currently being received Mobile radio terminals, characterized in that a, a channel switching means switches the channel of the received broadcast stations in the terrestrial digital broadcasting receiving unit and the one-segment broadcast receiving unit receiving channels. A mobile radio terminal adapted to the auto channel switching system according to claim 2,
A first one-seg broadcast receiving unit that selects a desired terrestrial digital broadcast station channel and receives a one-seg broadcast included in a part of the terrestrial digital broadcast signal from the broadcast station; and from the desired broadcast station Receiving a one-segment broadcast included in a part of the digital terrestrial broadcast signal by sequentially selecting a digital terrestrial broadcast channel other than the broadcast channel in the area while receiving the broadcast radio wave Channel information extraction means for extracting the channel information in the adjacent area included in the broadcast radio wave when the second one-seg broadcast receiving unit receives a broadcast radio wave from the broadcast station in the adjacent area; Broadcast station channel information of the same series as the desired terrestrial digital broadcast station being received from the channel information extracted by the channel information extraction means A sequence channel detecting means for detecting and outputting and a second one-seg broadcast receiving section sequentially selecting and receiving a channel other than the broadcast channel in the area while receiving a broadcast radio wave from the desired broadcast station. Channel search means for switching the second one-segment broadcasting reception unit to receive the same series broadcast station channel when the same series broadcast station channel information is input from the affiliate channel detection means. And the radio wave reception status of the broadcasting station of the same series received by the second one-seg broadcast reception unit and the radio wave reception status of the desired broadcast station being received by the first one-seg broadcast reception unit A reception status comparison means, and a radio wave reception status of the broadcasting station received by the second one-seg broadcast reception unit by the reception status comparison means A channel that switches the reception channel of the first one-seg broadcast reception unit to the channel of the broadcast station received by the second one-seg broadcast reception unit when it is determined that the radio wave reception status of the desired broadcast station is better. And a switching means.

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