JP2016012892A - Digital broadcast reception device, communication method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast reception device etc., capable of suitably receiving a television broadcast by suitably controlling a filter even when a transmission frequency of radio communication is switched in television broadcast reception without suppression of receiver sensitivity of the television broadcast.SOLUTION: A selected digital broadcast is received from an antenna for broadcast, a transmission signal and a reception signal are communicated through an antenna for communication at a communication frequency corresponding to a communication base station, and a comparison threshold corresponding to the communication frequency at which communication with the communication base station is performed is read out. A filter is switched to be inserted between the antenna for broadcast and a tuner part when an output level of the transmission signal is larger than the comparison threshold and to be bypassed when the output level of the transmission signal is equal to or less than the comparison threshold.

Description

  The present invention relates to a broadcast station that broadcasts a digital broadcast and a digital broadcast receiver that can be connected to a communication base station.

  Conventionally, digital broadcast receiving apparatuses that receive digital broadcasts are known. Known digital receivers include, for example, stationary devices such as liquid crystal televisions and STBs, and mobile devices such as mobile phones and smartphones.

  Here, in the case of a communication terminal device equipped with a terrestrial digital television broadcast reception function, terrestrial digital television broadcast and transmission / reception using a mobile phone network are performed. In this case, digital terrestrial television broadcasting using a broadcast band from 470 MHz to 710 MHz is close to the transmission frequency of the mobile phone.

  Therefore, if the mobile phone function transmits wirelessly to communicate with the base station while the program is being received by the digital TV broadcast function installed in the mobile phone, the reception output of the TV broadcast is suppressed by the transmission output. The reception sensitivity is lowered and the viewing quality is deteriorated.

  On the other hand, if the output level of the transmission signal for wireless communication exceeds a threshold value (comparison level), the transmission frequency band for wireless communication is cut off to suppress the influence on the digital terrestrial television broadcast band, An invention that switches a switch so as to receive a broadcast wave via a filter that transmits only the signal is known (for example, see Patent Document 1). This switch control is interrupted at predetermined intervals.

JP 2007-60077 A

  In the above-described technique, transmission power (output level) is detected at a predetermined cycle and filter control is performed when the power of the television receiver (mobile phone) is ON. Therefore, the filter control is not always performed at the timing when the frequency of the wireless communication is switched during reception of the television broadcast, and in that case, the reception sensitivity of the television broadcast is suppressed.

  In view of the above-described problems, the present invention can appropriately control the reception sensitivity of a television broadcast without suppressing the reception sensitivity of the television broadcast by appropriately controlling the filter even when the transmission frequency band of the wireless communication is switched during the reception of the television broadcast. It is to provide a digital broadcast receiving apparatus or the like that can receive a television broadcast.

In view of the above-described problems, the digital broadcast receiving apparatus of the present invention is
In a broadcast station that broadcasts digital broadcast and a digital broadcast receiver that can be connected to a communication base station,
A tuner unit that receives a digital broadcast selected from a broadcasting antenna;
A transmission / reception unit that communicates a transmission signal and a reception signal at a communication frequency corresponding to a communication base station via a communication antenna;
A plurality of duplexers for different communication frequency bands through which a transmission signal and a reception signal pass;
A comparison threshold value reading unit for reading a comparison threshold value corresponding to a communication frequency communicating with the communication base station;
When the output level of the transmission signal is larger than the comparison threshold, a filter is inserted between the broadcasting antenna and the tuner unit, and when the output level of the transmission signal is less than the comparison threshold, the filter A filter switching determination unit that switches so as to bypass
It is characterized by providing.

The communication method of the present invention includes:
In a communication method in a digital broadcast receiving apparatus that can be connected to a broadcasting station that broadcasts digital broadcasting and a communication base station, and that has a tuner unit that receives a digital broadcasting selected from a broadcasting antenna,
The digital broadcast receiving apparatus has a plurality of duplexers for different communication frequency bands through which a transmission signal and a reception signal pass,
Receive a digital broadcast selected from the broadcasting antenna,
Communicate the transmission signal and the reception signal at the communication frequency corresponding to the communication base station via the communication antenna,
Read a comparison threshold value corresponding to a communication frequency communicating with the communication base station,
When the output level of the transmission signal is larger than the comparison threshold, a filter is inserted between the broadcasting antenna and the tuner unit, and when the output level of the transmission signal is less than the comparison threshold, the filter Switch to bypass,
It is characterized by that.

  According to the present invention, a digital broadcast selected from a broadcasting antenna is received, a transmission signal and a reception signal are communicated via a communication antenna at a communication frequency corresponding to the communication base station, and the communication base station A comparison threshold value corresponding to a communication frequency being communicated is read, and when the output level of the transmission signal is larger than the comparison threshold value, a filter is inserted between the broadcasting antenna and the tuner unit, When the output level is less than or equal to the comparison threshold, the filter can be switched to bypass.

  As a result, when the transmission frequency band is switched, the output level of the transmission signal is detected and it is determined whether the filter is passed through the television broadcast reception system. Therefore, even if the transmission frequency band is switched, It is possible to prevent deterioration of reception sensitivity.

It is a figure for demonstrating the whole system in 1st Embodiment. It is a block diagram which shows the function structure of the portable terminal in 1st Embodiment. It is a block diagram which shows an example of the comparison level table in 1st Embodiment. It is an operation | movement flow for demonstrating the flow of the process in 1st Embodiment. It is a block diagram which shows an example of the comparison level table in 2nd Embodiment. It is an operation | movement flow for demonstrating the flow of the process in 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In this embodiment, as an example, a case will be described in which the digital broadcast receiving apparatus according to the present invention is applied to a mobile terminal 10 such as a mobile phone / smartphone or a portable digital broadcast receiver.

[1. First Embodiment]
[1.1 Overall configuration]
FIG. 1 is an overall configuration diagram of a system 1 to which a mobile terminal 10 equipped with a TV reception function belongs. The mobile terminal 10 equipped with the TV reception function can be connected to the communication base station 20 of a plurality of communication systems. In that case, the connection with the communication base station 20 of each communication system switches the frequency band to be used for communication. ing. For example, the communication base station 22 in the 700 MHz band, the communication base station 24 in the 800 MHz band, and the communication base station 26 in the 900 MHz band can be connected. The TV can be viewed by receiving broadcast waves from the broadcast station 30.

[1.2 Functional configuration]
Next, the functional configuration of the mobile terminal 10 will be described with reference to FIG. It has an antenna 102 for receiving broadcast waves, a filter 105 for blocking interference waves and allowing only television broadcast waves to pass through, bypass wiring for bypassing, and front and rear switches 104, 106 for switching them.

  The tuner unit 108 receives and demodulates a television broadcast wave, outputs a TS (transport stream), and measures the reception intensity of the channel being received.

  The signal processing unit 402 performs an analysis process on the TS data output from the tuner unit 108, decomposes the data into video data and audio data, and outputs the data to the display unit 404 and the audio output unit (speaker) 406. The function of receiving a signal from the operation unit 408, analyzing the contents and transmitting the control information to the function control unit 302, converting the analog signal input from the microphone 410 into a digital signal, and sending it by wireless communication A function for processing and outputting to the communication transmission unit 216, a function for analyzing and decomposing data from the communication reception unit 218, converting it to analog data, and outputting it to the receiver 412, and a function for communication When there is an instruction to connect to a communication system using a different frequency by analyzing the synchronization signal with the communication system notified from the reception unit 218 A function of notifying a frequency switching instruction to the control unit 302.

  The operation unit 408 has a function of notifying a signal processing unit of a request input from a user as a man-machine interface. For example, it is configured by operation buttons, a touch panel, and the like.

  Upon receiving an instruction from the signal processing unit 402, the function control unit 302 receives the tuner unit 108, the communication transmission unit 216, the communication reception unit 218, the communication switch 204, 212, 214, the filter switching determination unit 304, and the comparison level setting unit. Control of 306 is performed.

  The communication transmission unit 216 transmits the sound from the microphone 410 to the communication system side in accordance with the transmission sequence of the communication system to be connected in accordance with the instruction from the function control unit 302. In addition, the communication transmission unit 216 notifies the function control unit 302 of the output level of the transmission signal in wireless communication with the communication system.

  The communication receiving unit 218 receives data in accordance with the reception sequence of the communication system to be connected in accordance with an instruction from the function control unit 302 and passes the data to the signal processing unit 402.

  Further, the communication receiving unit 218 periodically receives a synchronization signal for maintaining connection with the communication system, and notifies the signal processing unit 402 of the synchronization signal.

  The duplexer is for sharing the same communication antenna 202 for transmission and reception, and separates the reception signal from the antenna 202 and the transmission signal from the communication transmitter. In addition, since the frequency used by each communication system differs, the duplexer corresponding to each frequency is required. The present embodiment includes a 700 MHz band duplexer 207, an 800 MHz band duplexer 208, and a 900 MHz band duplexer 209.

  Further, before and after the duplexer, there is a switch for switching the duplexer, which is controlled by the function control unit 302. The switch includes a switch 204 on the antenna 202 side, a switch 212 on the communication transmission unit 216 side, and a switch 214 on the communication reception unit 218 side.

  The comparison level setting unit 306 receives a notification of the frequency used in the communication system, the reception intensity of the received broadcast wave, and the reception channel from the function control unit 302, and receives an appropriate comparison level from the comparison level storage unit 308. Is notified to the filter switching determination unit 304.

  The filter switching determination unit 304 compares the comparison level (threshold value) notified from the comparison level setting unit 306 with the output level of the transmission signal notified from the function control unit 302, and based on the comparison level (threshold value), When the output level is high, a filter is inserted, and when the output level is low, control is performed to switch the switches 104 and 106 to the bypass wiring side.

  The comparison level storage unit 308 stores a comparison level corresponding to the reception intensity of the broadcast wave for each frequency used in the communication system and for each frequency of the selected television broadcast wave as a comparison level table. Here, the comparison level storage unit 308 is configured by a semiconductor storage memory, a fixed disk, or the like.

  An example of the comparison level table is shown in FIG. For example, comparison level data is stored for each frequency (for example, “700 MHz band”) used in communication. The comparison level data stores a comparison level (for example, “comparison level data A1”) in association with the broadcast wave reception intensity (for example, “small”) as the broadcast wave reception intensity.

[1.3 Process flow]
Next, specific filter switching control in the present embodiment will be described with reference to FIG. As a premise of processing, it is assumed that the mobile terminal 10 is currently connected to a communication system that uses a frequency in the 800 MHz band.

  First, it is determined whether or not the TV tuner is being activated (step S102). When the TV tuner requests the user to view a television broadcast via the operation unit 408, the signal processing unit 402 transmits a tuner activation instruction and channel selection information to the function control unit 302. In response to this instruction, the function control unit 302 activates the tuner. Channel selection information is notified to the tuner unit 108 to select a specified channel, and the TV tuner is activated. The tuner unit 108 starts reception of the selected channel, measures the received electric field strength, and notifies the function control unit 302 of it.

  When the TV tuner is activated (step S102; Yes), it is next determined whether or not communication with the communication system is in progress (step S104). If not communicating with the communication system (step S104; No), the filter is bypassed (step S114). On the other hand, when communicating with the communication system (step S104; Yes), the transmission signal output level in the communication system is detected (step S106).

  Specifically, when connecting to a communication system using a frequency in the 800 MHz band, the function control unit 302 receives an instruction from the signal processing unit 402, controls the communication transmission unit 216 and the communication reception unit 218, and uses them. It is known that the duplexer 208 corresponding to the frequency to be used is switched and the duplexer 208 corresponding to the 800 MHz band is currently used. At this time, the output level of the transmission signal is notified from the communication transmitter 216 at regular intervals, and the output level of the transmission signal is detected.

  Subsequently, a comparison level suitable for the communication frequency is set (step S108). In this case, the comparison level is read from the comparison level table and set corresponding to the frequency of the communication base station that is currently communicating and the reception intensity of the broadcast wave.

  Specifically, the function control unit 302 currently uses what frequency in communication and what level of transmission signal output level is received, how many channels are received in television reception, and how much received electric field strength. Is detected. The information is notified to the filter switching determination unit 304 and the comparison level setting unit 306.

  The comparison level setting unit 306 selects an appropriate comparison level from the comparison level table stored in the comparison level storage unit 308 from the notified frequency used for communication, the channel receiving television, and the reception intensity. Then, the filter switching determination unit 304 is notified.

  The filter switching determination unit 304 compares the notified comparison level with the transmission signal output level notified from the function control unit 302 (step S110). When the transmission output level is higher than the comparison level (step S110; Yes), the switches 104 and 106 on the television reception side are switched, and the filter 105 for blocking the transmission signal is inserted (step S112). When the transmission signal output level is equal to or lower than the comparison level, the filter is bypassed by switching the switches 104 and 106 to the bypass wiring (Step S110; No → Step S114).

  If the frequencies used in communication are the same, the process is returned to the beginning and repeatedly executed (step S116; Yes → step S102). On the other hand, when the frequency used in communication becomes a different frequency (step S116; No), the duplexer on the communication side is switched (step S118), and the processing is repeatedly executed from step S106.

  Specifically, when there is an instruction from the communication system side to connect to a communication system using 700 MHz, the signal processing unit 402 notifies the function control unit 302 of a frequency switching instruction, and the function control unit 302 follows the notification. Then, the communication transmission unit 216 and the communication reception unit 218 are controlled to switch to the duplexer 207 corresponding to the switched frequency.

  Thereafter, the function control unit 302 notifies the comparison level setting unit 306 again of the frequency being used, the channel being received by the television, and the reception intensity.

  The comparison level setting unit 306 again selects an appropriate comparison level from the comparison level storage unit 308 from the notified frequency being used, that is, 700 MHz, the channel being received by the television, and the reception intensity. The switching determination unit 304 is notified again.

  The filter switching determination unit 304 compares the notified comparison level with the transmission signal output level, that is, the 700 MHz band transmission signal output level, and switches the filter / bypass.

  In this way, even when the frequency of the communication base station changes during reception of digital broadcast, it is possible to set an appropriate comparison level. Therefore, even when the transmission frequency band is switched, filter insertion and bypass are appropriately selected, and it is possible to prevent deterioration in reception sensitivity of digital broadcasting.

[2. Second Embodiment]
Next, the second embodiment will be described. In the second embodiment, the change in the setting of the comparison level (threshold value) will be described by taking as an example the operation when the channel is changed during viewing of a television broadcast. The functional configuration of the mobile terminal 10 is the same as that shown in FIG.

  A comparison level table in the present embodiment is shown in FIG. The comparison level table has not only a table for each frequency used in communication but also a table for each frequency of the currently selected television channel. By doing this, it is possible to set a comparison level that takes into account not only the frequency used in communication but also the frequency of the currently selected television broadcast, and the reception sensitivity of the television reception by suppressing the sensitivity of the transmission signal. A filter is inserted when deterioration is significant.

  The flow of processing in this embodiment is shown in FIG. In addition, about the process same as the operation | movement flow shown in FIG. 4 of 1st Embodiment, detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  When viewing the television, if the viewing television channel is changed by the user via the operation unit 408 (step S202; No), the signal processing unit 402 notifies the function control unit 302 of channel selection information. The function control unit 302 notifies the tuner unit 108 of channel selection information. The tuner unit 108 receives the channel selection information and switches the channel.

  In addition, the tuner unit 108 measures the reception intensity of the switched channel and notifies the function control unit 302 of it.

  The function control unit 302 notifies the comparison level setting unit 306 of the frequency used for communication, the channel receiving television, and the received electric field strength.

  The comparison level setting unit 306 again selects an appropriate comparison level from the comparison level storage unit 308 and notifies the filter switching determination unit 304 of it.

  Thereby, 2nd Embodiment can set the comparison level for every channel further in a comparison level table. This makes it possible to set a more appropriate comparison level.

[3. Third Embodiment]
Next, a third embodiment will be described. In the first embodiment and the second embodiment, the comparison level (threshold value) is stored in the comparison level storage unit 308, but the third embodiment is a process of calculating the comparison level.

  Specifically, without comparing the comparison level storage unit 308 stored in the first embodiment and the second embodiment, the comparison level setting unit 306 calculates the comparison level by a calculation formula (proportional expression). .

  That is, the comparison level may be calculated based on the calculation formula from the frequency used in communication and the reception sensitivity of the broadcast wave. For example, the function formula in each case is stored. Here, a function value may be provided for each frequency used in communication, and the comparison level may be calculated based on the reception intensity of the broadcast wave. In this case, it is not necessary to store values in advance as a comparison level table.

[4. Modified example]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope of the present invention are also within the scope of the claims. include.

  Note that the digital broadcast receiving apparatus of the above-described embodiment is applicable as long as it can receive digital broadcasts such as a mobile phone including a smartphone, a tablet, a car navigation system, a TV, and a computer.

  Further, although the communication method in the present embodiment has been described with a hardware configuration, it may be configured and realized with software as necessary. For example, the CPU implements each functional unit (for example, each functional unit such as the filter switching determination unit 304, the communication transmission unit 216, and the communication reception unit 218) by reading and executing the program. Also good.

  In addition, the program that operates in each device in the embodiment is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments. Information handled by these devices is temporarily stored in a temporary storage device (for example, RAM) at the time of processing, then stored in various ROM or HDD storage devices, and read and corrected by the CPU as necessary. • Writing is performed.

  In addition, when distributing to the market, the program can be stored and distributed in a portable recording medium, or transferred to a server computer connected via a network such as the Internet. In this case, of course, the storage device of the server computer is also included in the present invention.

  Further, although the above-described comparison level table is described as being stored in advance in the terminal, it may be configured to be downloaded as necessary. Further, the comparison level data may be determined based on the frequency and channel used in communication instead of the broadcast wave reception intensity.

1 system; 10 mobile terminal; 20, 22, 24, 26 communication base station; 30 broadcast station 102, 202 antenna; 104, 106 switch; 105 filter 108 tuner unit; 207, 208, 209 duplexer 204, 212, 214 switch; 216 Communication transmission unit; 218 Communication reception unit 302 Function control unit; 304 Filter switching determination unit; 306 Comparison level setting unit 308 Comparison level storage unit; 402 Signal processing unit; 404 Display unit 406 Audio output unit; 410 microphone; 412 receiver

Claims (5)

In a broadcast station that broadcasts digital broadcast and a digital broadcast receiver that can be connected to a communication base station,
A tuner unit that receives a digital broadcast selected from a broadcasting antenna;
A transmission / reception unit that communicates a transmission signal and a reception signal at a communication frequency corresponding to a communication base station via a communication antenna;
A plurality of duplexers for different communication frequency bands through which a transmission signal and a reception signal pass;
A comparison threshold value reading unit for reading a comparison threshold value corresponding to a communication frequency communicating with the communication base station;
When the output level of the transmission signal is larger than the comparison threshold, a filter is inserted between the broadcasting antenna and the tuner unit, and when the output level of the transmission signal is less than the comparison threshold, the filter A filter switching determination unit that switches so as to bypass
A digital broadcast receiving apparatus comprising:   The digital broadcast receiving apparatus according to claim 1, wherein the comparison threshold value reading unit reads the comparison threshold value based on the communication frequency and a reception intensity received by the tuner unit.   The digital broadcast receiving apparatus according to claim 1, wherein the comparison threshold value reading unit further reads the comparison threshold value based on a selected channel. In a communication method in a digital broadcast receiving apparatus that can be connected to a broadcasting station that broadcasts digital broadcasting and a communication base station, and that has a tuner unit that receives a digital broadcasting selected from a broadcasting antenna,
The digital broadcast receiving apparatus has a plurality of duplexers for different communication frequency bands through which a transmission signal and a reception signal pass,
Receive a digital broadcast selected from the broadcasting antenna,
Communicate the transmission signal and the reception signal at the communication frequency corresponding to the communication base station via the communication antenna,
Read a comparison threshold value corresponding to a communication frequency communicating with the communication base station,
When the output level of the transmission signal is larger than the comparison threshold, a filter is inserted between the broadcasting antenna and the tuner unit, and when the output level of the transmission signal is less than the comparison threshold, the filter Switch to bypass,
A communication method characterized by the above.   A program for causing a computer to realize the communication method according to claim 4.

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