JP6522979B2 - TV receiver - Google Patents

Description

  The present invention relates to a television receiver capable of viewing terrestrial digital television broadcast according to a plurality of broadcast standards.

  In terrestrial television broadcasting, the transition from analog broadcasting to digital broadcasting is in progress worldwide, but the broadcasting standard in terrestrial digital television broadcasting is not unified all over the world, and Japanese system (ISDB-T), Brazil There are multiple standards, such as the system (ISDB-TB), the European system (DVB-T), the second generation European system (DVB-T2), the US system (ATSC) and the Chinese system (DTMB). For this reason, when it is going to view terrestrial digital television broadcasting, for example in the ship which navigates the world, the situation where a broadcast standard changes with the area and port area which are navigating will arise. In preparation for such a situation, there is a television receiver described in, for example, Patent Document 1 as one that enables one television receiver to view television broadcasts all over the world.

Unexamined-Japanese-Patent No. 2006-86730

  However, the television receiver of Patent Document 1 specifies a position by receiving a GPS radio wave, and specifies a broadcast standard (modulation method) based on the position information, so the following problems occur. there were. First, a receiver for receiving GPS radio waves is required, which may increase the cost of the television receiver. Second, since it is necessary to receive GPS radio waves in addition to radio waves of terrestrial digital television broadcasting, there is a risk that the range over which television broadcasting can be viewed may be narrowed.

  The television receiver according to the present invention has been made in view of the above problems, and its object is to make it possible to view terrestrial digital television broadcast with a plurality of broadcast standards without using GPS radio waves.

  The present invention is a television receiver capable of viewing digital terrestrial television broadcasts according to a plurality of broadcast standards, wherein a plurality of tuners for performing demodulation processing of received radio waves are provided according to the respective broadcast standards. And a control unit for causing the plurality of types of tuners to execute channel scanning, the control unit receiving radio waves received by the tuner that was able to detect a channel by channel scanning among the plurality of types of tuners. To perform the demodulation process of

  The tuner unit of the television receiver according to the present invention is provided with a plurality of types of tuners for performing demodulation processing of the received radio waves according to each broadcast standard. Then, since the control unit is configured to cause the tuner that can detect the channel by channel scanning among the plurality of types of tuners to perform demodulation processing of the received radio wave, even if there is no position information by GPS, Terrestrial digital television broadcasting can be viewed by a plurality of broadcasting standards.

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a television receiver. It is an example of the screen displayed on a monitor. It is a flowchart which shows the process of the control part in multi scan mode. It is a flow chart which shows processing of a control part in electric wave surveillance control.

(Configuration of television receiver)
Hereinafter, embodiments of a television receiver according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a television receiver. The television receiver 1 mainly includes an antenna input terminal 10, a tuner unit 20, a control unit 30, an input receiving unit 40, a storage unit 50, a video output terminal 60, and an audio output terminal 70. The radio wave of digital terrestrial television broadcasting received by the antenna 80 is appropriately processed by the television receiver 1 so that it can be viewed on the output unit 100 including a monitor, a speaker, and the like.

  The antenna input terminal 10 is a terminal to which the antenna 80 is connected. The radio wave received by the antenna 80 is sent to the tuner unit 20 via the antenna input terminal 10.

  The tuner unit 20 is provided with a plurality of types of tuners 21 to 24 in accordance with each broadcast standard. The ATSC tuner 21 is a tuner compatible with the US system (ATSC), and the DVB-T / T2 tuner 22 is a tuner compatible with the European system (DVB-T) and the second generation European system (DVB-T2), The DTMB tuner 23 is a tuner compatible with the Chinese system (DTMB), and the ISDB-T / TB tuner 24 is a tuner compatible with the Japanese system (ISDB-T) and the Brazilian system (ISDB-TB). In the present embodiment, two tuners 21 to 24 are provided in order to perform radio wave monitoring control described later.

  Each of the tuners 21 to 24 has a tuning function to convert the frequency of an RF (Radio Frequency) signal to an IF (Intermediate Frequency) signal, a demodulation function to demodulate the IF signal according to the modulation method specified in each broadcasting standard, an error It has an error correction function that detects and corrects The signals input from the antenna input terminal 10 to the tuners 21 to 24 are finally output to the control unit 30 as TS (Transport Stream) signals.

  In addition, each of the tuners 21 to 24 can execute a channel scan for searching for a frequency (channel) that can potentially view terrestrial digital television broadcasts. Each of the tuners 21 to 24 outputs, to the control unit 30, channel detection availability information as to whether or not a channel capable of demodulation processing has been detected as a result of channel scanning. When a channel scan can detect even one channel that can be demodulated, information relating to the channel frequency is output to the control unit 30 together with an enable signal indicating that a channel that can be viewed is found. Ru. On the other hand, when a channel that can be demodulated can not be detected, a denial signal indicating that a channel that can be viewed is not found is output to the control unit 30. In addition to the above, radio wave quality information and the like regarding the quality level (for example, CN ratio) of the received radio wave is also output from each of the tuners 21 to 24 to the control unit 30.

  The control unit 30 is a unit that performs various processes based on the signal sent from the tuner unit 20, and includes a DEMUX (demultiplexing) 31, a video / audio processing unit 32, and the like. The DEMUX 31 separates and extracts video data and audio data from the TS signal output from the tuner unit 20. The video / audio processing unit 32 decodes the encoded video data and the encoded audio data separated and extracted by the DEMUX 31. In addition, the control unit 30 executes various processes to be described later based on the information input from the tuner unit 20, the input receiving unit 40, and the storage unit 50.

  The input receiving unit 40 receives the information input by the input unit 90, and sends this information to the control unit 30. The input unit 90 is for the user to give various instructions to the television receiver 1, and is configured of, for example, a remote control or a touch panel.

  The storage unit 50 stores data and programs necessary for the control unit 30 to execute various processes. For example, a program or the like for demodulating a signal modulated by a modulation method defined in each broadcast standard is stored. Further, channel information and the like sent from the tuner unit 20 can also be stored in the storage unit 50.

  The video output terminal 60 is a terminal for outputting the video data sent from the video / audio processing unit 32 to the output means 100. The audio output terminal 70 is a terminal for outputting the audio data sent from the video / audio processing unit 32 to the output means 100.

  A series of flows in the case of viewing terrestrial digital television broadcast using the television receiver 1 configured as described above will be described.

  When the user views digital terrestrial television broadcasting, for example, a screen as shown in FIG. 2 can be displayed on the monitor of the output means 100 by a predetermined operation using the input means 90. Such a screen may be automatically displayed when the television broadcast can not be viewed based on the channel information stored in the storage unit 50. The display unit for displaying such a screen may be other than the output unit 100.

  When the user knows the broadcast standard at the current location, the input standard 90 is selected by the input unit 90. For example, if it is known that the current location can view American television (ATSC) television broadcasts, as shown in FIG. 2, "North America, South Korea, etc. (ATSC)" is selected. Then, the control unit 30 operates the ATSC tuner 21 and channel scanning by the ATSC tuner 21 is started. As a result, the information on the channel frequency that can be viewed at the current location is stored in the storage unit 50, and the television broadcast can be viewed by the ATSC tuner 21 thereafter.

  On the other hand, when the user does not know the broadcast standard at the current location, the multi scan mode is executed by the control unit 30 by selecting “scan all” on the screen shown in FIG. In this multi-scan mode, channel scans of radio waves received by the antenna 80 are sequentially performed by the respective tuners 21 to 24, and it is specified by which of the tuners 21 to 24 a channel that can be demodulated can be detected. It is a mode. Hereinafter, the multi scan mode will be described.

(Multi scan mode)
FIG. 3 is a flowchart showing processing of the control unit in the multi-scan mode. When the multi scan mode is selected, first, the control unit 30 causes the ATSC tuner 21 to execute channel scanning of the received radio wave, and receives channel detection availability information from the ATSC tuner 21 (step S101). As a result, when the channel detection availability information is an enable signal, the control unit 30 receives information on a channel frequency that can be viewed from the ATSC tuner 21 and stores the information in the storage unit 50 (step S102). Then, the multi scan mode is ended.

  On the other hand, in step S101, when the channel detection availability information is a no signal, the control unit 30 causes the DVB-T / T2 tuner 22 to execute channel scanning of the received radio wave, and the DVB-T / T2 tuner The channel detection availability information is received from S22 (step S103). As a result, when the channel detection availability information is an enable signal, the control unit 30 receives information on a channel frequency that may be viewable from the DVB-T / T2 tuner 22, and stores the information in the storage unit 50. It memorizes (Step S104). Then, the multi scan mode is ended.

  Similarly, in step S103, when the channel detection availability information is a no signal, the control unit 30 causes the DTMB tuner 23 to execute channel scan of the received radio wave, and the demodulation processing availability information from the DTMB tuner 23 Are received (step S105). As a result, when the channel detection availability information is an enable signal, the control unit 30 receives information on a channel frequency that may be viewable from the DTMB tuner 23 and stores the information in the storage unit 50 (step S106). Then, the multi scan mode is ended.

  Furthermore, in step S105, when the channel detection availability information is a no signal, the control unit 30 causes the ISDB-T / TB tuner 24 to execute channel scanning of the received radio wave, and the ISDB-T / TB tuner Demodulation process enable / disable information is received from step S24 (step S107). As a result, when the channel detection availability information is an enable signal, the control unit 30 receives information on a channel frequency that may be viewable from the ISDB-T / TB tuner 24, and stores the information in the storage unit 50. It memorizes (Step S108). Then, the multi scan mode is ended.

  Incidentally, if the channel detection availability information is a no signal at step S107, there is no channel that can be viewed, and information on the channel frequency is not stored in the storage unit 50. The control unit 30 ends the multi scan mode.

  According to the multi-scan mode, it is possible to receive channel detection availability information from each of the tuners 21 to 24, and based on this information, it is possible to specify which of the tuners 21 to 24 a channel that may be viewable can be detected. The control unit 30 determines to perform demodulation processing of the radio wave received by the tuner, and reproduces the television broadcast based on the channel information stored in the storage unit 50.

(Radio monitoring control)
In the television receiver 1 of the present embodiment, each of the tuners 21 to 24 is provided with two main tuners and two sub-tuners, whereby radio waves from a plurality of broadcast stations (including a master station and relay stations) are provided. Radio wave surveillance control to monitor the quality level can be performed. Here, the main tuner is a tuner that receives a radio wave transmitted from a broadcast station currently being viewed (hereinafter referred to as “first broadcast station” for convenience), and the sub-tuner is received by the television receiver 1 The tuner is a tuner that receives radio waves transmitted from a broadcast station (hereinafter referred to as “second broadcast station” for convenience) transmitting radio waves higher in quality level than the first broadcast station.

  FIG. 4 is a flowchart showing the operation of the control unit in radio wave monitoring control. In the radio wave monitoring control, the control unit 30 sets the CN ratio of the radio wave of the channel currently received by the main tuner at a predetermined time interval, the radio wave of the same channel as the main tuner received by the sub tuner, or The CN ratio of the radio waves of the channels of the broadcasting stations not belonging to the same channel but belonging to the same series is compared. Specifically, it is determined whether the difference obtained by subtracting the CN ratio of the received radio wave of the main tuner from the CN ratio of the received radio wave of the sub-tuner is, for example, 5 or more (step S201). As a result, if the difference is less than 5, step S201 is repeatedly executed at predetermined time intervals without performing special processing.

  On the other hand, if the difference is 5 or more in step S201, the timer built in the control unit 30 is set to 0, and counting is started (step S202). Then, it is appropriately determined whether the count by the timer has become, for example, 10 seconds or more (step S203). Here, if the count is less than 10 seconds, it is determined again whether the difference obtained by subtracting the CN ratio of the received radio wave of the main tuner from the CN ratio of the received radio wave of the subtuner is 5 or more (step S204). ).

  In the process of repeating steps S203 and S204, if the difference is less than 5 in step S204, the process is restarted from step S201. On the other hand, in the process of repeating steps S203 and S204, when the count is determined to be 10 seconds or more in step S203, that is, the difference obtained by subtracting the CN ratio of the received radio wave of the main tuner from the CN ratio of the received radio wave of the subtuner. When the state of 5 or more continues for 10 seconds or more, the control unit 30 switches to the viewing by the radio wave transmitted from the second broadcast station (step S205). Specifically, the main tuner switches so that the radio wave from the second broadcast station is received, and this can be viewed. Alternatively, the role of the main tuner (for viewing and listening to the broadcast) and the role of the sub-tuner (for searching for the radio wave) may be switched, and the radio wave from the second broadcast station may be viewed by what has been the sub tuner.

(effect)
The tuner unit 20 of the television receiver 1 of the present embodiment is provided with a plurality of types of tuners 21 to 24 for performing demodulation processing of the received radio wave according to each broadcast standard. Then, the control unit is configured to cause the tuner that can detect the channel by channel scanning among the plurality of types of tuners to execute demodulation processing of the received radio wave. Therefore, according to the television receiver 1, since terrestrial digital television broadcasting can be viewed according to a plurality of broadcast standards without positional information by GPS, cost reduction and expansion of the viewable range can be achieved.

  In addition, the control unit 30 according to the present embodiment causes a plurality of types of tuners 21 to 24 to sequentially execute channel scanning, and specifies a multi-channel tuner 21 to 24 which can detect a channel that may be viewed. The scan mode is configured to be executable. By executing such a multi-scan mode, it is possible to easily view digital terrestrial television broadcasting without the user knowing the broadcasting standard at the current location.

  In addition, the control unit 30 ends the multi scan mode when it is determined which of the tuners 21 to 24 can detect a channel that may be viewed. Therefore, even when the user does not know the broadcast standard at the current location, it is possible to quickly view the terrestrial digital television broadcast.

  Further, in the present embodiment, the main tuner for receiving radio waves transmitted from the first broadcast station being viewed and the radio waves transmitted from the second broadcast stations other than the first broadcast station for each of the tuners 21 to 24 A sub-tuner for receiving is provided, and the control unit 30 transmits the radio wave transmitted from the second broadcast station when the quality level of the radio wave received by the sub-tuner is higher than the quality level of the radio wave received by the main tuner It is configured to switch to viewing by. According to this configuration, even when the broadcasting station optimum for viewing television broadcasting changes, the control unit 30 can automatically receive radio waves transmitted from the optimum broadcasting station, and the television broadcasting can be continued It becomes possible to view and listen.

  Furthermore, in the present embodiment, the control unit 30 determines that the quality level of the radio wave received by the sub-tuner is higher by a predetermined value (for example, 5) than the quality level of the radio wave received by the main tuner for a predetermined time (for example, 10 seconds). 2.) When continuing, it is made to switch to the viewing and listening by the electric wave transmitted from the 2nd broadcasting station. Therefore, for example, in an area where there is not much difference between the quality level of the received radio wave by the main tuner and the quality level of the received radio wave by the sub-tuner, the viewing radio wave is frequently switched or the viewing radio wave is frequently switched There is nothing to do. That is, since it is possible to switch to viewing by the radio wave transmitted from the second broadcast station after the sub-tuner is in a state where radio waves of higher quality level are stably received than the main tuner.

[Other embodiments]
The present invention is not limited to the above embodiment, and the elements of the above embodiment can be appropriately combined or variously modified without departing from the scope of the invention.

  For example, although the ATSC tuner 21, the DVB-T / T2 tuner 22, the DTMB tuner 23, and the two ISDB-T / TB tuners 24 are mounted in the tuner unit 20 of the above embodiment, the tuner unit The type and number of tuners mounted on 20 can be changed as appropriate.

  Further, in the multi scan mode of the above embodiment, as shown in FIG. 3, channel scan is executed in the order of the ATSC tuner 21, the DVB-T / T2 tuner 22, the DTMB tuner 23, and the ISDB-T / TB tuner 24. However, this order can be changed as appropriate.

  In the above embodiment, the multi-scan mode is executed when “all scan” is selected on the screen of FIG. 3, but the multi-scan mode is not limited to this case. For example, even if the user selects a specific broadcast standard on the screen of FIG. 3, it is erroneous, and if a channel scan can not be detected due to a channel scan, multiscan is automatically performed. The mode may be executed. Alternatively, the multi-can mode may be automatically executed when viewing becomes impossible while viewing a television broadcast.

  Further, in the radio wave monitoring control of the above embodiment, two each of the tuners 21 to 24 are provided, one of which is used as a main tuner for viewing broadcast and the other is used as a sub-tuner for radio wave search. However, three or more tuners 21 to 24 may be provided, one of which may be a main tuner for viewing a broadcast, and the other may be a sub-tuner for radio wave search.

  Further, in the radio wave monitoring control of the above embodiment, the CN ratio is used as an index of the quality level of the received radio wave, but instead of the CN ratio, an electric field strength, an error rate, or a data loss rate may be used. .

  In the above embodiment, as shown in FIG. 2, the demodulation process (channel scan) by each of the tuners 21 to 24 is executed by an instruction via a screen displayed on the monitor of the output unit 100. However, such an instruction may be performed by an instruction unit such as a button provided on the television receiver 1.

  Although the antenna 80 is provided separately from the television receiver 1 in the above embodiment, the antenna 80 may be integrally provided in the television receiver 1.

1: Television receiver 20: Tuner unit 21 to 24: Tuner 30: Control unit

Claims (3)

A television receiver capable of viewing terrestrial digital television broadcast according to a plurality of broadcast standards, comprising:
A tuner section provided with a plurality of types of tuners for performing demodulation processing of the received radio wave according to each of the broadcast standards;
A control unit that causes the plurality of types of tuners to execute channel scanning;
Equipped with
The control unit can execute a multi scan mode for causing the plurality of types of tuners to sequentially execute channel scanning and specifying the type of the tuner capable of detecting a channel, and a channel scan among the plurality of types of tuners can be performed. Make the tuner that was able to detect the channel execute demodulation processing of the received radio wave ,
The control unit ends the multi-scan mode when specifying the type of the tuner capable of detecting a channel . A main tuner for receiving radio waves transmitted from a first broadcast station being viewed and a sub-tuner for receiving radio waves transmitted from a second broadcast station other than the first broadcast station are provided for each type of tuner. It has been
Wherein, when the quality level of the received radio wave is higher than the quality level of the radio wave received by the main tuner by the sub-tuner, to claim 1 for switching in view of radio waves transmitted from the second broadcasting station The television receiver as described. The control unit is transmitted from the second broadcast station when the quality level of the radio wave received by the sub-tuner continues to be higher than the quality level of the radio wave received by the main tuner by a predetermined value for a predetermined time. The television receiver according to claim 2 , wherein the television receiver switches to radio wave viewing.

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