JP2007124579A - Tuner unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tuner unit capable of selecting stations of a plurality of broadcast systems without increasing the number of antenna terminals with respect to an antenna unit for selecting a signal of a desired broadcast wave from an antenna signal. <P>SOLUTION: The tuner unit including a tuner section (112) for simultaneously receiving a terrestrial broadcast digital broadcast program and a satellite digital broadcast program includes: an antenna input terminal (Tain); an antenna output terminal (Taout); and a distribution section (111) for distributing a signal received by the antenna input terminal (Tain) to the antenna output terminal (Taout) and the tuner section (112). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tuner unit, and more particularly to an antenna unit that selects a desired broadcast wave signal from an antenna signal.

  In recent years, digital broadcasting has been developed. Digital broadcasting mainly includes terrestrial digital broadcasting and BS / 100 degree CS broadcasting. The tuner unit is desired to be able to select terrestrial digital broadcasting and BS / 100 degree CS broadcasting. At this time, the terrestrial digital broadcasting and the BS / 100 degree CS broadcasting have different frequency bands and require separate receiving circuits.

In order to reduce the size of the tuner unit, a tuner unit in which the tuner unit is integrated by terrestrial digital broadcasting and BS / 100 degree CS broadcasting has been developed (for example, see Patent Document 1).
JP-A-11-341373

  When the tuner unit is mounted on a television or a video recorder, an antenna input terminal and an antenna output terminal are generally provided to connect the antenna to the video recorder or the television. Therefore, in an integrated tuner unit capable of receiving terrestrial digital broadcast and BS / 100 degree CS broadcast, the antenna terminals are the terrestrial digital broadcast antenna input terminal, the terrestrial digital broadcast antenna output terminal, and the BS / 100. A CS broadcasting antenna input terminal and a BS / 100 degrees CS broadcasting antenna output terminal are required. For this reason, the tuner unit increases in size, and accordingly, problems such as an increase in the size of equipment on which the tuner unit is mounted are generated.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a tuner unit that can select a plurality of broadcasting schemes without increasing the number of antenna terminals.

  The present invention is a tuner unit having a tuner unit (112) for simultaneously receiving terrestrial digital broadcasting and satellite digital broadcasting, and includes an antenna input terminal (Tain), an antenna output terminal (Taout), and an antenna input terminal (Tain). It has a distribution part (111) which distributes the inputted signal to an antenna output terminal (Taout) and a tuner part (112).

  The antenna input terminal (Tain) is supplied with a mixed antenna signal in which a terrestrial digital broadcast wave signal and a satellite digital broadcast wave signal are mixed, and the distribution unit (111) distributes the mixed antenna signal. A distribution circuit (122) for supplying one to the antenna output terminal (Taout), and the other of the mixed antenna signals distributed by the distribution circuit (122) are supplied, and a digital terrestrial broadcast signal and a satellite digital broadcast signal And a demultiplexing circuit (123) for demultiplexing and supplying to the tuner unit (112).

  The tuner unit (112) includes a digital terrestrial broadcast tuner unit (141) that selects a desired broadcast wave from the terrestrial digital broadcast wave signal demultiplexed by the demultiplexing circuit (123), and a demultiplexing circuit. And a satellite digital broadcast tuner unit (142) for selecting a desired broadcast wave from the satellite digital broadcast wave signal.

  In addition, the said reference code is a reference to the last, and description of a claim is not limited by this.

  According to the present invention, the distribution unit that distributes the signal input to the antenna input terminal to the antenna output terminal and the tuner unit is integrated with the tuner unit, so that a plurality of broadcasting systems can be selected without increasing the antenna terminals. The size of the tuner unit can be suppressed.

[Tuner unit]
FIG. 1 is a block diagram showing an embodiment of a tuner unit according to the present invention.

  The tuner unit 100 of this embodiment is a unit for selecting a desired channel from terrestrial digital broadcasting and satellite digital broadcasting. The circuit board 113 on which the distribution unit 111 and the tuner unit 112 are mounted is stored in a shield case 114. And it is set as the integrated structure.

  The antenna input terminal Tain and the antenna output terminal Taout are configured by F-type connectors to which a coaxial cable can be connected, and are provided so as to protrude from the outer surface of the shield case 114. A coaxial cable is connected to the antenna input terminal Tain, and a signal obtained by mixing a terrestrial digital broadcast wave signal and a satellite digital broadcast wave signal is supplied from the coaxial cable. The mixed signal supplied to the antenna input terminal Tain is supplied to the distribution unit 111.

[Distributor 111]
FIG. 2 shows a block configuration diagram of the distribution unit 111.

  The distribution unit 111 includes a band pass filter 121, a distribution circuit 122, and a demultiplexing circuit 123. The mixed signal supplied to the antenna input terminal Tain is first supplied to the bandpass filter 121. The band-pass filter 121 passes frequency components including both frequency bands of the terrestrial digital broadcast wave and the satellite digital broadcast wave from the mixed signal.

  The mixed signal that has passed through the bandpass filter 121 is supplied to the distribution circuit 122. The distribution circuit 122 distributes the mixed signal supplied to the antenna input terminal Tain and supplies the mixed signal to the antenna output terminal Taout and the duplexer 123.

  The duplexer 123 includes a distribution circuit 131, a low pass filter 132, a high pass filter 133, and high frequency amplifiers 134 and 135. The mixed signal distributed by the distribution circuit 131 is supplied to both the low-pass filter 132 and the high-pass filter 133. The low-pass filter 132 allows a signal component of terrestrial digital broadcasting that is a low frequency band component of the supplied mixed signal to pass therethrough. The signal that has passed through the low-pass filter 132 is supplied to the high-frequency amplifier 134. The high frequency amplifier 134 amplifies the signal that has passed through the low pass filter 132 and supplies the amplified signal to the tuner unit 112.

  The high-pass filter 133 passes a satellite broadcast signal component that is a high-frequency band component of the supplied mixed signal. The signal that has passed through the high-pass filter 133 is supplied to the high-frequency amplifier 135. The high frequency amplifier 135 amplifies the signal that has passed through the high pass filter 133 and supplies the amplified signal to the tuner unit 112.

[Tuner 112]
FIG. 3 is a block diagram of the tuner unit 112.

  The tuner unit 112 includes a terrestrial digital broadcast tuner unit 141, a satellite digital broadcast tuner unit 142, and a demodulation circuit unit 143.

[Tuner 141 for digital terrestrial broadcasting]
The terrestrial digital broadcast tuner unit 141 is a circuit for selecting a desired channel from terrestrial digital broadcast signals in the VL band, the VH band, and the UHF band, and includes an antenna tuning circuit 151, a high frequency tuning circuit 152, and a frequency conversion circuit. 153, an IF signal processing circuit 154.

  The antenna tuning circuit 151 is composed of bandpass filters 161-163.

  The band pass filter 161 passes the signal component in the VL band from the signal supplied from the high frequency amplifier 134. The band pass filter 162 passes the signal component in the VH band from the signal supplied from the high frequency amplifier 134. The band pass filter 163 passes the signal component in the UHF band from the signal supplied from the high frequency amplifier 134. The signals that have passed through the band pass filters 161 to 163 are supplied to the high frequency tuning circuit 152.

  The high frequency tuning circuit 152 includes AGC amplifiers 171 to 173 and band pass filters 174 to 176. The AGC amplifier 171 amplifies the signal that has passed through the band pass filter 161. The AGC amplifier 172 amplifies the signal that has passed through the bandpass filter 162. The AGC amplifier 173 amplifies the signal that has passed through the band pass filter 163.

  The signal amplified by the AGC amplifier 171 is supplied to the band pass filter 174. The band pass filter 174 passes the signal component in the VL band and supplies it to the frequency conversion circuit 153. The signal amplified by the AGC amplifier 172 is supplied to the band pass filter 175. The band pass filter 175 passes the signal component in the VH band and supplies it to the frequency conversion circuit 153. The signal amplified by the AGC amplifier 173 is supplied to the band pass filter 176. The band pass filter 176 passes the UHF band signal component and supplies the signal component to the frequency conversion circuit 153.

  The frequency conversion circuit 153 includes a PLL circuit, a VCO circuit, a mixer circuit, and the like. The frequency conversion circuit 153 oscillates at a frequency corresponding to the channel selection signal from the demodulation circuit unit 143 and is supplied from the bandpass filters 174 to 176. By mixing the signal, a desired channel component of the high-frequency signal is converted into a predetermined intermediate frequency. The signal converted to the intermediate frequency by the frequency conversion circuit 153 is supplied to the IF signal processing circuit 154.

  The IF signal processing circuit 154 includes SAW filters 181 and 182 and amplifiers 183 and 184. The signal converted to the intermediate frequency by the frequency conversion circuit 153 is supplied to the SAW filter 181, and unnecessary components are removed, and then supplied to the amplifier 183. The amplifier 183 amplifies the signal from which unnecessary components have been removed by the SAW filter 181. The signal amplified by the amplifier 183 is supplied to the SAW filter 182. The SAW filter 182 removes unnecessary components from the signal amplified by the amplifier 183.

  The signal from which unnecessary components are removed by the SAW filter 182 is supplied to the amplifier 184. The gain of the amplifier 184 is controlled by the AGC signal supplied from the demodulation circuit unit 143 so that the amplitude of the output signal is constant. An output signal of the amplifier 184 is supplied to the demodulation circuit unit 143.

[Satellite Digital Broadcast Tuner 142]
The satellite digital broadcast tuner unit 142 is a circuit for selecting a desired channel from a satellite digital broadcast signal, and includes a high-frequency signal processing circuit 191 and a frequency conversion circuit 192.

  The high-frequency signal processing circuit 191 includes bandpass filters 201 and 202, amplifiers 203 and 204, and attenuators 205 and 206. The signal output from the high frequency amplifier 135 of the distribution unit 111 is first supplied to the band pass filter 201. The band pass filter 201 removes unnecessary components from the signal from the high frequency amplifier 135 and supplies the signal to the amplifier 203. The amplifier 203 amplifies the signal from the band pass filter 201 and supplies the amplified signal to the attenuator 205.

  The attenuator 205 attenuates the signal from the amplifier 203 in accordance with the AGC signal from the demodulation circuit unit 143 and supplies the attenuated signal to the bandpass filter 202. The band pass filter 202 removes unnecessary components from the signal from the attenuator 205 and supplies the signal to the amplifier 204. The amplifier 204 amplifies the signal from the band pass filter 202 and supplies it to the attenuator 206.

  The attenuator 206 attenuates the signal from the amplifier 204 according to the AGC signal from the demodulation circuit unit 143 and supplies the attenuated signal to the frequency conversion circuit 192. The frequency conversion circuit 192 includes a PLL circuit, a VCO circuit, a mixer circuit, and the like, oscillates at a frequency corresponding to the channel selection signal from the demodulation circuit unit 143, and mixes the high-frequency signal supplied from the attenuator 206. As a result, the component of the desired channel in the high frequency signal is converted into the baseband. The signal converted to baseband by the frequency conversion circuit 192 is supplied to the demodulation circuit unit 143.

  The demodulating circuit unit 143 controls the frequency conversion circuits 153 and 192 based on the channel selection signal supplied from the control terminal Tin, and outputs the IF signal of the desired channel to the terrestrial broadcasting tuner unit 141 and the satellite broadcasting tuner unit 142. And the digital video signal is demodulated from the IF signal supplied from the terrestrial digital broadcast tuner unit 141 and the satellite digital broadcast tuner unit 142 and output from the output terminal Tout.

  The shield case 114 is formed by punching and bending a metal plate, and stores the distribution unit 111 and the tuner unit 112 mounted on the circuit board 113. Distribution unit 111 and tuner unit 112 are separated from each other by a shield plate disposed therebetween. The tuner unit 112 includes a demodulating circuit unit 143 including an antenna tuning circuit 151, a high frequency tuning circuit 152, a frequency conversion circuit 153, a high frequency signal processing circuit 191, a frequency conversion circuit 192, and an IF signal processing circuit 154. Separated by shield plate.

  The terrestrial digital broadcast tuner unit 141 and the satellite digital broadcast tuner unit 142 provided in the tuner unit 112 can be simultaneously received, and can receive both the terrestrial digital broadcast and the satellite digital broadcast at a time.

  The antenna input terminal Tain and the antenna output terminal Taout protrude outward from a shield plate that separates the distribution unit 111 from the outside.

〔effect〕
According to the present embodiment, the distribution unit 111 that distributes the signal input to the antenna input terminal Tain to the antenna output terminal Taout and the tuner unit 112 is integrated with the tuner unit 100, so that it is newly added to the device when it is mounted on a device. It is not necessary to provide a distributor, and mounting on the equipment becomes easy.

  In addition, the tuner unit 100 of the present embodiment has only the antenna input terminal Tain and the antenna output terminal Taout that are connected to the antenna, and has the same configuration as that of the conventional terminal. Can be unitized. Therefore, it is possible to select a plurality of broadcasting schemes without increasing the number of antenna terminals, and to suppress an increase in the size of the tuner unit.

[Application example]
FIG. 4 shows a perspective view of an application example of one embodiment of the present invention.

  The tuner unit 100 is mounted on the end of the circuit board 211 of the device. The circuit board 211 on which the tuner unit 100 is mounted is housed inside a device case 212. At this time, the antenna input terminals Tain and Taout of the tuner unit 100 are provided to project outward from the case 212 of the device.

  At this time, the tuner unit 100 according to the present embodiment can be mounted on the device without increasing the antenna terminals of the device because the antenna terminals are only the antenna input terminal Tain and the antenna output terminal Taout. There is no need to do.

It is a block block diagram of one Example of the tuner unit of this invention. 3 is a block configuration diagram of a distribution unit 111. FIG. 3 is a block configuration diagram of a tuner unit 112. FIG. It is a perspective view of the example of application of one Example of this invention.

Explanation of symbols

100 Tuner Unit 111 Distribution Unit, 112 Tuner Unit, 113 Circuit Board, 114 Shield Case 121 Band Pass Filter, 122 Distribution Circuit, 123 Demultiplexing Circuit 131 Distribution Circuit, 132 Low Pass Filter, 133 High Pass Filter 134, 135 High Frequency Amplifier 141 Terrestrial Digital Tuner for broadcasting, 142 Tuner for satellite digital broadcasting

Claims (3)

A tuner unit having a tuner unit for simultaneously receiving terrestrial digital broadcasting and satellite digital broadcasting,
An antenna input terminal;
An antenna output terminal;
A tuner unit comprising: a distribution unit that distributes a signal input to the antenna input terminal to the antenna output terminal and the tuner unit. The antenna input terminal is supplied with a mixed antenna signal obtained by mixing the terrestrial digital broadcast wave signal and the satellite digital broadcast wave signal,
The distribution unit distributes the mixed antenna signal and supplies one to the antenna output terminal;
A demultiplexing circuit to which the other of the mixed antenna signals distributed by the distribution circuit is supplied, demultiplexed into the terrestrial digital broadcast wave signal and the satellite digital broadcast wave signal, and supplied to the tuner unit; The tuner unit according to claim 1. The tuner unit includes: a terrestrial digital broadcast tuner unit that selects a desired broadcast wave from the terrestrial digital broadcast wave signal demultiplexed by the demultiplexing circuit; and the satellite digital demultiplexer that is demultiplexed by the demultiplexer circuit. 3. The tuner unit according to claim 2, further comprising a satellite digital broadcast tuner unit that selects a desired broadcast wave from a broadcast wave signal.

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