JP5191860B2 - Retransmitter for TV broadcasting - Google Patents

Description

  The present invention relates to a television broadcast retransmission apparatus that adjusts a television broadcast signal received by an antenna to an appropriate level for each broadcast channel.

  The terrestrial broadcast signal received by the antenna has a level difference between the broadcast channels. Therefore, in a TV joint reception system such as an apartment house, if the system is constructed so that distortion does not occur in the broadcast channel with the highest reception level, there may be a dwelling unit that cannot view the broadcast channel with the low reception level. .

  For this reason, it is desirable to provide a television broadcast retransmission apparatus that adjusts the television broadcast signal received by the terrestrial broadcast reception antenna to an appropriate level for each broadcast channel on the head side of the television joint reception system.

  Usually, a television broadcast retransmission apparatus is provided with a plurality of input ports. This is a terrestrial broadcast receiving antenna that receives prefectural broadcasts outside of the area separately from terrestrial broadcast receiving antennas that receive wide area broadcasts and prefectural broadcasts within the area to enable reception of prefectural broadcasts outside the area. This is because it is considered that there is a case of installing.

“Channel Level Controller Catalog for Digital Terrestrial Broadcasting”, [online], June 2007, Hochiki Co., Ltd. [searched on September 22, 2008], Internet <URL: http://www.hochiki.co. jp / business / comm / webcatalog / pdf / hc_clc_0708.pdf>

  However, as described in the [Specification Example] column of Non-Patent Document 1, since the number of reception channels of each input port varies depending on the installation area of the television broadcast retransmission device, the specification of the television broadcast retransmission device is unique. In general, it has been dealt with a build-to-order manufacturing in which the configuration of the distribution unit provided in the subsequent stage of each input port is determined according to the installation area.

  Further, in order to avoid a build-to-order, an input port of a television broadcast retransmitting device is provided for each channel instead of for each terrestrial broadcast receiving antenna, that is, the input ports for the maximum number of channels assumed (for example, for 11 channels). In some cases, the correspondence of making the specification of the television broadcast retransmitting device unique may be adopted. However, when the input port of the television broadcast retransmitting device is provided for each channel, there is an advantage that mass production of the television broadcast retransmitting device is possible, but in addition to installing the television broadcast retransmitting device itself. Therefore, it is necessary to install a distributor for realizing a channel arrangement according to the installation area in front of the television broadcast re-transmission device, which causes a problem of increasing the burden on the installer.

  In view of the above situation, an object of the present invention is to provide a television broadcast retransmitting apparatus that can cope with a wide variety of channel arrangements without requiring an external distributor.

  In order to achieve the above object, a television broadcast retransmission apparatus according to the present invention distributes a plurality of terrestrial broadcast signal input units and a terrestrial broadcast signal input to the plurality of terrestrial broadcast signal input units. A television broadcast retransmission apparatus including a distribution unit that outputs a terrestrial broadcast signal of a predetermined number of channels, wherein the distribution unit receives the terrestrial broadcast signal input to the terrestrial broadcast signal input unit. A sub-distribution unit that distributes at a distribution number equal to or less than the number of channels for each terrestrial broadcast signal input unit, and the total number of terrestrial broadcast signals output from each of the sub-distribution units is greater than the predetermined number of channels, The distribution unit includes a selection unit for selecting the terrestrial broadcast signal of the predetermined number of channels, which is the output signal of the distribution unit, from the terrestrial broadcast signals output from each of the sub-distribution units. To.

  According to such a configuration, a plurality of channel arrangements are possible by selection of the selection unit. Therefore, it is possible to deal with a wide variety of channel arrangements without installing a distributor for realizing a channel arrangement corresponding to the installation area in the preceding stage of the television broadcast retransmission apparatus according to the present invention. Since it is not necessary to install a distributor for realizing a channel arrangement according to the installation area in the previous stage of the television broadcast retransmission apparatus according to the present invention, the burden on the installer can be reduced.

  Each of the sub-distribution units distributes the terrestrial broadcast signal input to the terrestrial broadcast signal input unit with a distribution number less than the predetermined number of channels, and is one of the plurality of terrestrial broadcast signal input units. One of the terrestrial broadcast signals output from one of the sub-distribution units and one of the sub-distribution units corresponding to another of the plurality of terrestrial broadcast signal input units. A plurality of switches that alternatively select one of the terrestrial broadcast signals may be provided.

  According to such a configuration, the configuration of the sub-distribution unit and the selection unit can be simplified.

  A distribution compensation amplifier may be provided between the terrestrial broadcast signal input unit and the sub-distribution unit for each sub-distribution unit.

  According to such a configuration, it is not necessary to install the distribution compensation amplifier in the previous stage of the television broadcast retransmitting apparatus according to the present invention, so that the burden on the installer can be further reduced.

  Further, on the output side of the distribution unit, a level adjustment unit that adjusts the level of the terrestrial broadcast signal of the predetermined number of channels for each channel, and the level of the predetermined number of channels that are output from the level adjustment unit You may provide the mixing part which mixes a terrestrial broadcast signal.

  According to the configuration of the television broadcast retransmission apparatus according to the present invention, a plurality of channel arrangements are possible by selection of the selection unit. Therefore, a distributor for realizing the channel arrangement according to the installation area is provided according to the present invention. It is possible to cope with a wide variety of channel arrangements without being installed in the front stage of the television broadcast retransmitting apparatus.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration example when the television broadcast retransmitting apparatus according to the first embodiment of the present invention is installed and used on the head side of the television joint reception system. The television broadcast retransmitting apparatus 100 according to the first embodiment of the present invention includes three input ports PT1 to PT3, an output port PT4, and an AC plug P1. The input port PT1 receives terrestrial broadcasts. The UHF antenna 101 which is an antenna is connected, the UHF antenna 102 which is a terrestrial broadcast receiving antenna is connected to the input port PT2, and the output port PT4 is connected to the UHF input port of the UHF / BS / CS mixer 103. The AC plug P1 is connected to a commercial power outlet not shown. The input port PT3 is normally an empty port.

  The television broadcast retransmission apparatus 100 according to the first embodiment of the present invention is driven by the AC power input from the AC plug P1, and receives the terrestrial broadcast signals received by the UHF antennas 101 and 102 at an appropriate level for each broadcast channel. The terrestrial broadcast signal after the level adjustment is sent to the UHF / BS / CS mixer 103.

  In the UHF / BS / CS mixer 103, a BS / CS antenna 104, which is a satellite broadcast receiving antenna, is connected to a BS / CS input port, and a terrestrial broadcast signal and BS / CS input to the UHF input port are connected. The satellite broadcast signal input to the input port is mixed, and the mixed UHF / BS / CS signal is sent to the booster 105.

  The UHF / BS / CS mixer 103 has a DC15V energization function between the output port and the BS / CS input port, and DC15V power superimposed from the input side of the booster 105 is applied to the BS / CS antenna 104. Supply. The LNB (Low Noise Block Converter) (not shown) of the BS / CS antenna 104 is driven by the DC 15V power supplied from the UHF / BS / CS mixer 103.

  The TV joint reception system is a reception facility such as a housing complex, UHF antennas 101 and 102 installed on the head side, a BS / CS antenna 104, and a television broadcast retransmission apparatus according to the first embodiment of the present invention. In addition to 100, UHF / BS / that mixes the terrestrial broadcast signal output from the television broadcast retransmitting apparatus 100 according to the first embodiment of the present invention and the satellite broadcast signal output from the BS / CS antenna 104. To distribute the CS mixer 103, the booster 105 that amplifies the broadcast signal (UHF / BS / CS mixed signal) output from the UHF / BS / CS mixer 103, and the output of the booster 105 to each dwelling unit, etc. Distributors 106-108. The booster 105 has a DC15V energization function for superimposing DC15V power from the input side.

  Next, FIG. 2 shows an internal configuration of the television broadcast retransmission apparatus 100 according to the first embodiment of the present invention. The television broadcast retransmitting apparatus 100 according to the first embodiment of the present invention includes a 3-input 11-output distribution unit 200 and 11 channel level adjustment units 201 that adjust different channels of terrestrial broadcasting to appropriate levels. To 211, a mixer 212 for mixing the terrestrial broadcast signals of each channel adjusted to an appropriate level, a capacitor provided between the mixer 212 and the output port PT4, and an AC power input from the AC plug P1 Is converted to DC power of a predetermined voltage value and supplied to each necessary part in the television broadcast retransmitting apparatus, and corresponds to 11 channels.

  Distribution unit 200 inputs the terrestrial broadcast signal input to input port PT1 through a capacitor, amplifies the input terrestrial broadcast signal to compensate for eight distributions, and converts the amplified terrestrial broadcast signal to a capacitor. A distribution compensation amplifier AMP1 that outputs the output signal, a sub-distribution unit including two distributors 1 to 7 that distributes the output signal of the distribution compensation amplifier AMP1, and each distribution signal obtained by dividing the output signal of the distribution compensation amplifier AMP1 into eight. Attenuators A1 to A8 that respectively attenuate are provided.

  Distribution section 200 receives the terrestrial broadcast signal sent to input port PT2 via a capacitor, amplifies the input terrestrial broadcast signal to compensate for six distributions, and the amplified terrestrial broadcast signal. Distribution compensation amplifier AMP2 that outputs the output signal of the distribution compensation amplifier AMP2, a sub-distribution unit comprising two distributors 8 to 12 that distribute the output signal of the distribution compensation amplifier AMP2, and each distribution that distributes the output signal of the distribution compensation amplifier AMP2 to six Attenuators A9 to A14 for attenuating signals are provided.

  Further, distribution section 200 inputs the terrestrial broadcast signal sent to input port PT3 through a capacitor, amplifies the input terrestrial broadcast signal so as to compensate for two distributions, and the amplified terrestrial broadcast signal The distribution compensation amplifier AMP3 that outputs the output signal of the distribution compensation amplifier AMP3, the sub-distributor unit that distributes the output signal of the distribution compensation amplifier AMP3 into two, and the distribution signals that are divided into two output signals of the distribution compensation amplifier AMP3 Attenuators A15 and A16 for attenuation are provided.

  The distribution unit 200 also includes a two-pole signal switching relay R1 that selectively selects a terrestrial broadcast signal output from the attenuator A5 and a terrestrial broadcast signal output from the attenuator A9, and an attenuator A6. A terrestrial broadcast signal output from the attenuator A10 and a terrestrial broadcast signal output from the attenuator A10. Two-pole signal switching relay R3 that selectively selects the terrestrial broadcast signal output from the attenuator A11, the terrestrial broadcast signal output from the attenuator A8, and the terrestrial broadcast signal output from the attenuator A12. A two-pole signal switching relay R4 that selectively selects the terrestrial broadcast signal that is output from the attenuator A14 and a terrestrial broadcast signal that is output from the attenuator A15. Signal switching relay R5 and cha A channel sequence setting switch S1 to S3, and a CPU (Central Processing Unit) C1 for controlling the bipolar signal switching relay R1~R5 in accordance with the output of the switch S1 to S3. The channel arrangement setting switches S1 to S3 can be set in 10 ways as a whole.

  Further, the distribution unit 200 sends the terrestrial broadcast signal output from the attenuator A1 to the channel level adjustment unit 201 and the terrestrial broadcast signal output from the attenuator A2 to the channel level adjustment unit 202. The output terminal OUT2 for transmission, the terrestrial broadcast signal output from the attenuator A3 to the channel level adjustment unit 203, and the terrestrial broadcast signal output from the attenuator A4 to the channel level adjustment unit 204. The output terminal OUT4 for sending out, the terrestrial broadcast signal outputted from the two-pole signal switching relay R1 to the channel level adjusting unit 205, and the terrestrial broadcasting outputted from the two-pole signal switching relay R2. An output terminal OUT6 for sending a signal to the channel level adjustment unit 206 and a relay R3 for switching between two-pole signals An output terminal OUT7 for sending the output terrestrial broadcast signal to the channel level adjustment unit 207; an output terminal OUT8 for sending the terrestrial broadcast signal output from the bipolar signal switching relay R4 to the channel level adjustment unit 208; An output terminal OUT9 for sending the terrestrial broadcast signal output from the attenuator A13 to the channel level adjustment unit 209 and an output for sending the terrestrial broadcast signal output from the bipolar signal switching relay R5 to the channel level adjustment unit 210. And a terminal OUT10 and an output terminal OUT11 for sending the terrestrial broadcast signal output from the attenuator A16 to the channel level adjustment unit 211.

  According to the distribution unit 200 having the above-described configuration, ten channel arrangements are possible as shown in FIG. Accordingly, the distributor for realizing the channel arrangement according to the installation area is not installed in the front stage of the television broadcast retransmission apparatus 100 according to the first embodiment of the present invention, and can cope with various channel arrangements. Can do. In addition, since the television broadcast retransmitting apparatus 100 according to the first embodiment of the present invention incorporates the distribution compensation amplifiers AMP1 to AMP3, the distribution compensation amplifier is used as the television broadcast retransmission according to the first embodiment of the present invention. There is no need to install the transmitter 100 in the previous stage.

  Next, a configuration example of the channel adjustment units 201 to 211 provided in the subsequent stage of the distribution unit 200 will be described with reference to FIG.

  Each of the channel level adjustment units 201 to 211 is, in order from the distribution unit 200 side, a capacitor 14, a bandpass filter 15 that allows UHF band signals to pass through, a gain control unit 16, an amplifier 17, and a low-pass that cuts high-frequency noise. A filter 18, an up-conversion mixer 19 that converts a terrestrial broadcast signal (UHF band signal) output from the low-pass filter 18 into a first intermediate frequency signal, and a SAW (Surface) that passes the first intermediate frequency band signal Acoustic Wave) filter 20, amplifier 21, downconverting mixer 22 that converts the first intermediate frequency signal output from amplifier 21 into a second intermediate frequency signal, and a signal in the second intermediate frequency band (57 MHz band). Pass the SAW filter 23, the branching device 24, the amplifier 25, and the signal of the second intermediate frequency band. A SAW filter 26 that converts the second intermediate frequency signal output from the SAW filter 26 into a first intermediate frequency signal, a SAW filter 28 that passes a signal in the first intermediate frequency band, and an amplifier 29, a down-converting mixer 30 that converts the first intermediate frequency signal output from the amplifier 29 into a terrestrial broadcast signal (UHF band signal), a gain controller 31, an amplifier 32, and a UHF band signal. A band pass filter 33 and a capacitor 34 are provided.

  Each of the channel level adjustment units 201 to 211 includes a detector 35 that detects a signal from the branching device 24, and the gain control unit 16 adjusts the gain according to the detection result of the detector 35. That is, the detector 35 and the gain control unit 16 function as an AGC (Automatic Gain Control) circuit. The gain of the gain controller 31 is the same in all the channel level adjustment units 201 to 211, and the level of each channel of the terrestrial broadcast signal is adjusted by the gain controller 31 after being aligned by the AGC circuit. Is done.

  Further, each of the channel level adjustment units 201 to 211 includes a channel selection switch 36, a CPU 37, PLL (Phase Locked Loop) circuits 38 and 40, and a reference voltage source 39. A channel is selected by switching the channel selection switch 36, and the CPU 37 sends a control signal corresponding to the channel selection result of the channel selection switch 36 to the PLL circuits 38 and 40. Each of the PLL circuits 38 and 40 includes a voltage controlled oscillator, a first frequency divider that sets a frequency division ratio according to a control signal from the CPU 37 and divides the output (local oscillation signal) of the voltage controlled oscillator, and the CPU 37. The second frequency divider that divides the output of the reference voltage source 39 with the frequency division ratio set according to the control signal from the first and second frequency dividers is compared with the output of the first frequency divider and the output of the second frequency divider A comparator that outputs an error signal, and a loop filter that converts the error signal output from the comparator into a DC voltage signal and controls the voltage controlled oscillator by the DC voltage signal. The local oscillation signal of the PLL circuit 38 is sent to the up-conversion mixer 19 and the down-conversion mixer 30 to up-convert the UHF band signal to the first intermediate frequency signal and from the first intermediate frequency signal to the UHF band. The local oscillation signal of the PLL circuit 40 is sent to the down-conversion mixer 22 and the up-conversion mixer 27, and down-converted from the first intermediate frequency signal to the second intermediate frequency signal. Used for up-conversion from the second intermediate frequency signal to the first intermediate frequency signal.

Second Embodiment
Next, FIG. 5 shows a configuration example in the case where the television broadcast retransmission apparatus according to the second embodiment of the present invention is installed and used on the head side of the television joint reception system. 5 that are the same as those in FIG. 1 are assigned the same reference numerals, and detailed descriptions thereof are omitted. Unlike the television broadcast retransmission apparatus 100 ′ according to the first embodiment of the present invention, the television broadcast retransmission apparatus 100 ′ according to the second embodiment of the present invention is configured to have two input ports.

  Next, FIG. 6 shows an internal configuration of a television broadcast retransmission apparatus 100 ′ according to the second embodiment of the present invention. In FIG. 6, the same parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The television broadcast retransmitting apparatus 100 ′ according to the second embodiment of the present invention includes a 2-input 8-output distribution unit 200 ′ and eight channel level adjustments that adjust different channels of terrestrial broadcasting to appropriate levels. Units 201 to 208, mixer 212 for mixing terrestrial broadcast signals of each channel adjusted to an appropriate level, a capacitor provided between mixer 212 and output port PT4, and AC plug P1. A power supply unit 213 that converts AC power into DC power having a predetermined voltage value and supplies the DC power to necessary units in the television broadcast retransmitting apparatus is provided, and is compatible with 8 channels.

  The distribution unit 200 ′ includes the two distributors 10 and 12, the attenuators A13 and A14, the distribution compensation amplifier AMP3, and the like from the distribution unit 200 included in the television broadcast retransmission apparatus 100 according to the first embodiment of the present invention. The capacitor before the distribution compensation amplifier AMP3, the capacitor after the distribution compensation amplifier AMP3, the two dividers 13, and the attenuators A15 and A16 are removed, and one output of the two dividers 8 is connected to the two dividers 11 The configuration is directly connected to the input. The channel arrangement setting switches S1 to S3 can be set in five ways as a whole.

  According to the distribution unit 200 'configured as described above, five channel arrangements are possible as shown in FIG. Accordingly, a distributor for realizing a channel arrangement corresponding to the installation area is not installed in the front stage of the television broadcast retransmitting apparatus 100 ′ according to the second embodiment of the present invention, and can correspond to various channel arrangements. be able to. Also, since the television broadcast retransmitting apparatus 100 ′ according to the second embodiment of the present invention incorporates the distribution compensation amplifiers AMP1 and AMP2, the distribution compensation amplifier is used for the television broadcast according to the second embodiment of the present invention. There is no need to install it before the retransmitting apparatus 100 ′.

<Modification>
In the television broadcast retransmitting apparatus according to the first and second embodiments of the present invention described above, the CPU in the distribution unit performs energization control of the distribution compensation amplifier in the distribution unit, and the terrestrial broadcast receiving antenna is connected. The distribution compensation amplifier provided at the subsequent stage of the input port that is not connected may not be energized.

  In addition, since there is a case where a preamplifier is provided between the television broadcast retransmission apparatus according to the first and second embodiments of the present invention and the terrestrial broadcast reception antenna, the first and second of the present invention described above. An energization terminal and an inductor that connects the energization terminal and the signal transmission line are provided for each input port between the input port and the distribution unit of the television broadcast retransmission apparatus according to the second embodiment, and the power supply unit 213. Alternatively, a predetermined DC voltage may be supplied to the energization terminal to supply DC power to the preamplifier.

  Further, in the above-described television broadcast retransmission apparatus according to the first and second embodiments of the present invention, the distribution number of the terrestrial broadcast signal input to each input port is less than the output number of the distribution unit. The distribution number of the terrestrial broadcast signal input to the input port is matched with the output number of the distribution unit, and the matrix of the input port and the signal distributed from the terrestrial broadcast signal input to the input port (for example, the number of input ports is The output of the distribution unit may be arbitrarily selected from a matrix of 3 × 11 when the number is 3 and the number of outputs of the distribution unit is 11.

These are figures which show the structural example at the time of installing the retransmission apparatus for television broadcasting which concerns on 1st Embodiment of this invention in the head side of a television joint reception system. These are figures which show the internal structure of the retransmission apparatus for television broadcasting which concerns on 1st Embodiment of this invention. These are figures which show the channel arrangement | sequence of the retransmission apparatus for television broadcasting which concerns on 1st Embodiment of this invention. These are figures which show the structural example of a channel level adjustment part. These are figures which show the structural example at the time of installing the television broadcast re-transmission apparatus which concerns on 2nd Embodiment of this invention in the head side of a television joint reception system. These are figures which show the internal structure of the retransmission apparatus for television broadcasting which concerns on 2nd Embodiment of this invention. These are figures which show the channel arrangement | sequence of the retransmission apparatus for television broadcasting which concerns on 2nd Embodiment of this invention.

Explanation of symbols

1-13 Dual distributor 14, 34 Capacitor 15, 33 Band pass filter 16, 31 Gain control unit 17, 21, 25, 29, 32 Amplifier 18 Low pass filter 19, 27 Up-conversion mixer 20, 23, 26, 28 SAW Filters 22 and 30 Down-conversion mixer 24 Branch unit 35 Detector 36 Channel selection switch 37 CPU
38, 40 PLL circuit 39 Reference voltage source 100 Retransmission device for television broadcast according to the first embodiment of the present invention 100 'Retransmission device for television broadcast according to the second embodiment of the present invention 101, 102 UHF antenna 103 UHF BS / CS mixer 104 BS / CS antenna 105 Booster 106 to 108 Distributor 200 Distributor 201 to 211 Channel level adjuster 212 Mixer 213 Power supply A1 to A16 Attenuator AMP1 to AMP3 Distributive compensation amplifier C1 CPU
OUT1 to OUT11 Output terminals R1 to R4 Bipolar signal switching relays S1 to S3 Channel arrangement setting switch P1 AC plug PT1 to PT3 Input port PT4 Output port

Claims (4)

Television broadcast comprising: a plurality of terrestrial broadcast signal input units; and a distribution unit that distributes the terrestrial broadcast signals input to the plurality of terrestrial broadcast signal input units and outputs a terrestrial broadcast signal having a predetermined number of channels Re-transmission device,
The distribution unit includes a sub-distribution unit that distributes the terrestrial broadcast signal input to the terrestrial broadcast signal input unit with a distribution number less than the predetermined number of channels for each terrestrial broadcast signal input unit,
The total number of terrestrial broadcast signals output from each of the sub-distribution units is greater than the predetermined number of channels,
The distribution unit includes a selection unit for selecting the terrestrial broadcast signal of the predetermined number of channels, which is an output signal of the distribution unit, from terrestrial broadcast signals output from the sub-distribution units. A retransmitting apparatus for television broadcasting characterized by the above. And one terrestrial broadcast signal output from one of the sub-distribution unit corresponding to one of the previous SL plurality of terrestrial broadcast signal input unit, corresponding to one another of said plurality of terrestrial broadcast signal input unit The television broadcast retransmission apparatus according to claim 1, further comprising: a plurality of switches that selectively select one of the terrestrial broadcast signals output from the other one of the sub-distributors.   The television broadcast retransmission apparatus according to claim 1 or 2, wherein a distribution compensation amplifier is provided for each of the sub-distribution units between the terrestrial broadcast signal input unit and the sub-distribution unit.   On the output side of the distribution unit, a level adjustment unit for adjusting the level of the terrestrial broadcast signal of the predetermined number of channels for each channel, and the level of the terrestrial wave of the predetermined number of channels output from the level adjustment unit The re-transmission apparatus for television broadcasting according to claim 1, further comprising a mixing unit that mixes broadcast signals.

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