JP3020813U - BS retransmission device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a BS re-transmission device that is compact and simple in structure, has the necessary functions, is low in cost, and is versatile. A channel selection unit 4 for selecting a desired channel from an input BS signal, and a demodulation unit 5 for demodulating the BS signal selected by the channel selection unit 4 into a predetermined signal,
The modulation means 6 for processing the signal demodulated by the demodulation means 5, directly modulating the single mixing section and transmitting it as a TV signal of a desired channel, the tuning means 4 and the modulation means 6 are controlled. A retransmitting unit with control means 7 and a TV from each retransmitting unit 10A, B
It is provided with a synthesizing means 9 for synthesizing the output signals into two channels, and the system of the BS signal and the TV from the retransmitting unit.
The discriminating means 12 for transmitting the signals on the same line is provided so as not to interfere with the signal system.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a common reception facility such as an apartment house, an office building, and a hotel, which operates as an all-channel TV modulator that receives satellite broadcast waves (BS signals) and outputs TV (television) broadcast waves in the UHF band. Retransmission device

[0002]

[Prior art]

 As a conventional BS retransmitting apparatus of this type, for example, an apparatus having a configuration shown in FIG. 4 is known. In the figure, reference numeral 91 is a BS input terminal, 92 is a BS monitor terminal, 93 is an AC outlet, and 94A and B are mixed distribution plates, which are shown separately for convenience of illustration, but are actually integrated. Reference numeral 95 is a power supply device, 96 is a power distribution plate, 97A and B are retransmitting devices for converting the input BS-IF signals into TV signals and retransmitting them, and 99 is a case where the retransmitting device is not used. A dummy, 100 is an RF output terminal for outputting a TV signal, and 101 is an RF output monitor terminal for monitoring a TV output signal.

Therefore, in this example, a case where two retransmission devices are mounted will be described. The BS signal input from the BS input terminal is input to each retransmitting device 97A, B via the mixing / distributing plate 94A. The BS signal is attenuated by about −10 dB and output from the BS monitor terminal 92. The AC power input from the AC outlet 93 is sent to the power supply device 95 via the mixing / distributing plate 94A, and then sent to the voltage distributing plate 96 as a DC power source of a predetermined voltage, and further to each retransmitting device 97A. , B as a power source. In addition, a DC power supply for superimposing a DC voltage at the BS input terminal 91 is supplied from the power supply device 95 to the mixing / distributing plate through a switch.

The BS signal input to each retransmitting device 97A, B is converted into a VHF band TV signal in each retransmitting device 97A, B and output to the mixing / distributing plate 94B. The mixing / distributing plate 94B mixes the TV signals sent from the respective retransmitting devices 97A and 97B and outputs them to the RF output terminal 100, and the signal attenuated by about -20 dB is used as a monitor output for the RF output monitor. Output to the terminal. A dummy 99 is attached to the unused slot for the retransmission device in order to prevent adverse effects such as reflection.

Next, the appearance of this conventional BS retransmission device will be described. FIG. 5 shows the front view. In the figure, 94A and B are mixed distribution plates, 95 is a power supply device, 96 is a power distribution plate, and 97 is each retransmission device. In the case of FIG. 4, one of them is a dummy 99.

As is clear from this figure, the mixing / distributing plates 94A, B, the power supply device 95, the power distributing plate 96, and each retransmitting device 97 are respectively configured for each block, and they are incorporated in a housing. It was one large BS retransmission device.

Next, the configuration of the TV modulator in the above-mentioned retransmission devices 97A and 97B will be described. FIG. 6 is a block diagram showing its main configuration. In the figure, the node N1 receives the demodulated audio signal and the video signal, which are respectively modulated at an intermediate frequency and is synthesized by the demodulators of all stages, and is input to the node N1. Entered in.

The first mixing unit 111 converts the signal modulated by the VCO 120 at the intermediate frequency into a predetermined high frequency. Part of the output of the VCO 120 is input to the phase detector 123 via the frequency divider 122, and the signal from the reference signal oscillator 125 to the amplifier 126 and frequency divider 124 is also input to the phase detector 123. Then, the two signals are compared, the difference between them is input to the control amplifier 121, and a PLL loop is formed so as to lock the signal of the VCO 120 so that a signal of a predetermined frequency is output.

The output from the first mixing unit 111 is input to the second mixing unit 114 via the bandpass filter 112 and the amplifier 113. The second mixing unit 114 inputs the output of the VCO 130 and converts it to a low frequency so that the frequency of the TV channel is output. In this VCO 130, when the data signal set by the channel selection switch 131 is input to the PLL 128, a part of the output of the VCO 130 is input to the PLL 128, the reference signal oscillator 125, the amplifier 126, and the frequency divider 127. The output of the difference between the two signals is compared with the reference signal and is input to the control amplifier 129 to form a PLL loop. The PLL 128 is controlled by the channel setting switch 131 so that the frequency of the VCO 130 can be varied so that the frequency corresponds to the channel set arbitrarily.

The output of the second mixer 114 is output to the node N 2 via the low-pass filter 115, the amplifier 116, the RF level adjusting volume 117, the amplifier 118, and the low-pass filter 119. Further, the data signal from the channel selection switch 131 is input to the low-pass filter 119, and the interfering wave having the frequency corresponding to the selected channel is cut.

[0011]

[Problems to be solved by the device]

 In such a conventional BS re-transmission device, the mixing / distributing plates 94A and B, the power supply device 95, the power distribution plate 96, each re-transmitting device 97, etc. are configured for each block, and the size is fixed. Since it is built into the housing of the device, it becomes large in size, and a re-transmitting device 97 corresponding to the TV channel to be transmitted is needed, or a dummy is attached to a channel that is not used, resulting in an increase in cost. .

Further, the TV signal modulating section also requires two mixing sections 111 and 114 due to the problem of interfering waves and the like, the number of parts is large, and adjustment is troublesome.

Further, in the conventional BS re-transmission device, since the frequency band of the TV signal to be transmitted is the VHF band, the usable channels change or are limited depending on the area, and there is a problem in versatility.

The present invention has been made in view of the above point, and an object thereof is to provide a BS re-transmission device having a small size, a simple structure, low cost, and general versatility. .

[0015]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a channel selecting means 4 for selecting a desired channel from an input BS signal and a BS signal demodulated by the channel selecting means 4 into a predetermined signal. Demodulation means 5, a modulation means 6 for processing the signal demodulated by the demodulation means 5, directly modulating a single mixing section and transmitting it as a TV signal of a desired channel, the tuning means 4, and the modulation means 4. It has been decided to have a retransmission unit with control means 7 for controlling the means 6.

Further, the channel selection means 4 has a frequency lock means by the BS tuner 41 and the AFC 42, and the demodulation means 5 further performs a voice demodulation with a V IDE QPSK demodulation means 51 for demodulating an output signal from the BS tuner 41. The PCM demodulating means 52 is provided, and the modulating means 6 is a TV multiplex encoder 61 for modulating TV sound, a signal processing circuit 62 for adjusting the level of a video signal and modulating the FM of a sound signal, and this video signal and sound. It has a synthesizing means 64 for synthesizing the signals and a single mixing section 65 for converting the output of the synthesizing means 64 into a predetermined frequency by the outputs from the oscillators 66, 67, and the control means 7 is connected to the BS by the switch. The channel and the input means 8 for giving the setting data of the channel of the TV signal to be retransmitted are provided.

Further, there is provided the synthesizing means 9 which has two retransmitting units and synthesizes the TV output signals from the respective retransmitting units 10A and 10B into two channels.

Further, the discriminating means 12 is provided to send out on the same line so that the system of the BS signal and the system of the TV signal from the retransmitting unit do not interfere with each other.

[0019]

[Action]

 The tuning means 4 selects a desired BS channel from the BS-IF signal input from the BS antenna and the BS converter, and outputs it as an FM signal of a predetermined frequency in which a video signal and an audio signal are mixed. The demodulation means 5 demodulates the FM signal in which the BS channel video signal and the audio signal selected by the channel selection means 4 are mixed into a predetermined video signal and audio signal. The modulation means 6 directly modulates the single mixing section using the signal demodulated by the demodulation means 5 and sends it out as a TV signal of a desired channel. Then, the control means 7 controls the channel selection means 4 and the modulation means 6 by the channel input from the input means 8 or the like to set the channel or the like.

By including the retransmitting units 10A and 10B having such a configuration, the BS retransmitting device having a simple configuration, low cost, and general versatility can be obtained.

Further, by providing the two retransmitting units and combining the TV output signals from the respective retransmitting units 10A and 10B into two channels, a combining means 9 is provided, so that a small-scale shared reception facility can be provided. It becomes a so-called two-wave type, that is, two-channel re-transmission device having a necessary function and a simple structure and compact.

Further, the BS-IF signal is transmitted by providing the discriminating means 12 for transmitting on the same line so that the system of the BS signal for monitoring and the system of the TV signal from the retransmission unit do not interfere with each other. It can be connected to other BS tuners.

[0023]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention. In the figure, 1A and B are BS input terminals to which the BS-IF signal from the BS antenna is input, 2A and B are BS output terminals that output the BS signal input to another retransmission unit, and 3 is an RF output terminal. BS input terminal for sending BS output.

Further, 4 is a channel selecting means for selecting a BS signal of a desired channel from the input BS signal and outputting it as an FM signal in which a video signal and an audio signal are mixed, and 5 is a video demodulation from the FM signal. Demodulation means for extracting the signal and the audio demodulation signal respectively, 6 is a modulation means for directly modulating the video demodulation signal and the audio demodulation signal demodulated by the demodulation means, and outputting as a predetermined TV signal, Reference numeral 7 is control means for setting channels of the tuning means 4 and modulation means 6, and 8 is input means for inputting setting channels to the control means 7, and 10A and B are these tuning means 4 or modulation means. It is a retransmission unit comprising means 6, control means 7 and input means 8.

Reference numeral 9 is a synthesizing means for synthesizing the outputs of the retransmitting units 10A and 10B and sending out a TV signal of 2 channels, and 12 is a BS signal inputted from the BS input terminal and each retransmitting unit 10A. , A TV signal sent from B, and a distributing means for sending the TV signal or the BS signal to be outputted, which are sent to the same transmission line without giving any adverse effect to the respective circuits. Reference numeral 14 is an RF output terminal for transmitting the TV signal or BS signal to be retransmitted, and 15 is an RF monitor terminal for monitoring the RF output signal. As is apparent from the figure, there are two retransmitting units 10A and 10B, and there are input terminals and the like associated therewith, but details of the other retransmitting unit are omitted. The two-wave type is used in this way because in a relatively small-scale shared reception facility, if 2ch can be used for re-transmission, the functions required as a re-transmission device can be fully exhibited.

Then, the BS-IF signal inputted from the BS input terminal 1B is tuned to a desired BS channel by the channel selection means 4, converted into an FM signal having a predetermined frequency and outputted. The channel selection means 4 is given an instruction of the channel selected by the control means 7. The FM signal is a signal in which a video signal and an audio signal are mixed.

The FM signal output from the channel selection means 4 is demodulated by the demodulation means 5 into a video demodulation signal and an audio demodulation signal. Further, the video demodulated signal and the audio demodulated signal are converted into a TV signal of a predetermined channel by the modulation means 6. The modulation means 6 also receives the instruction from the control means 7 and sets the channel. Further, since this modulating means 6 directly modulates a single mixing section, the circuit configuration is simple.

The TV signal output in this way is mixed with the TV signal from the other retransmitting unit 10A by the mixing means 9 so that it can be converted into an arbitrary 2ch TV signal. Further, the output of the mixing means 9 is outputted from the RF output terminal 14 to the same transmission line by the discrimination means 12 separately from the BS signal inputted from the BS input terminal 3. This discriminating means 12 operates as a filter for separating the TV signal and the BS signal so as not to interfere with each other.

As described above, the BS re-transmission device having a simple structure and capable of supporting any channel of a two-wave type is provided.

Next, a more specific embodiment of the present invention will be described. FIG. 2 is a block diagram showing a specific configuration of the present invention. The same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

The BS signal inputted from the BS input terminal 1B via the BS input terminal 1A → BS output terminal 2A of the other retransmission unit 10A, or directly inputted to the BS input terminal 1B is selected by the channel selection means 4 Is input to the BS tuner 41. In the BS tuner 41, the BS input terminal is connected to the BS output terminal 2A in a through state. The FM signal output from the BS tuner 41 is demodulated into a video signal and a PCM audio signal by the VIDEO / QPSK demodulation 51, and the audio signal is PCM demodulated 52 into an analog L signal component and an R signal component, and each is a low pass filter. Via the levels 53 and 54, the levels are adjusted to appropriate levels by the level adjusting volume 55 and 56, respectively, and output together with the video signal to the modulation means 6.

In the modulation means 6, the video signal is clamped by the signal processing circuit 62 and adjusted to an appropriate level by the video modulation adjustment volume 63. The L and R audio signals are subjected to audio multiplex processing by the TV multiplex encoder 61, and the signal processing circuit 62 performs FM modulation. Then, it is input to the mixing unit 65 via the synthesizing resistors R1, R2 and R3. The output of the oscillator (VCO) 67 is input to the other input of the mixing unit 65, and the two signals are combined and converted into a TV signal of a predetermined frequency.

As described above, the modulation mixing section 65 has only one stage, that is, only a single mixing section. In this way, the mixing section 65 may have a single stage, so that in the configuration of the present invention, the low-pass filter 69 and the diplex filter 12 after the mixing section 65 cut off high-frequency components, and no interference wave components or the like occur. This is because it is attenuated to some extent.

Further, the VCO 67 is phase-locked by a loop formed by the PLL 66, and the frequency of the PLL 66 locked by an instruction from the control means 7 is controlled. That is, the control means 7 is composed of a CPU and its peripheral parts, a predetermined control program, etc., and in accordance with the TV channel input from the input means 8 such as a DIP switch, data, clock, A signal such as enable is given to the PLL 66.

Similarly, signals such as data, clock and enable are given to the BS tuner 41 as BS channel information. Further, frequency data is given to the control means 7 from the BS tuner 41 via the D / A converter 42, and constitutes an AFC (automatic frequency control circuit) to prevent the frequency lock from being released.

The output of the mixing section 65 is given to the synthesizing means 9 via the amplifier 68 and the low-pass filter 69 as the output of the retransmission unit 10A. A signal from another retransmitting unit 10B is also input to the synthesizing means 9, and a TV signal of two different frequencies, that is, a channel is a two-wave type capable of being sent to the same carrier line. The synthesizing means 9 is similar to a synthesizing device used for synthesizing a so-called general TV signal and so its detailed description is omitted.

The output of the synthesizing means 9, together with the BS-IF signal input from the BS input terminal 3 by the discriminating means 12, is sent out on the same carrier line so as not to adversely affect the circuit operation of each other. This discriminating means is a so-called diplex filter, which separates the BS signal band and the TV signal band from each other to prevent other signal components from mixing into the circuit. As a result, BS signals can be sent to the same carrier line as TV signals, and BS broadcasting can be received by a terminal receiver having a BS tuner.

The signal sent from the discriminating means 12 is output to the RF output terminal 14 and the RF monitor output terminal 15 by the distributing means 13, respectively. The distributing means 13 is a so-called distributor, and can be obtained by well-known technical means, and the detailed description thereof will be omitted. To the RF output terminal 14, a cable for connecting to a terminal receiving device or the like of the joint reception system is connected. The RF monitor output terminal is used to monitor the signal.

In addition, in this embodiment, all channels can be used by using signals in the UHF band as TV signals. That is, by using the UHF band, the degree of freedom in the usable channels is increased, the versatility is increased, and the expensive SAW filter is not used, as compared with the VHF band in which the usable channels are different depending on the region. It is possible to reduce the cost of waste.

Next, the external appearance of the BS retransmission device according to the present invention will be described. 3 (a) is a top view, FIG. 3 (b) is a front view, and FIG. 3 (c) is a bottom view. In the figure, the same components as those of FIG. 2 are designated by the same reference numerals, and the description thereof is omitted. In the figure, 81 and 82 are volumes for adjusting the RF output level which is a TV output signal, 83 is a fuse holder, 84 is a ground terminal, 85 is a power cord, and 8 is a rotary type DIP switch which is an input means. The UHF band channel which is a TV signal and the channel setting of the BS channel are set by. Further, reference numeral 80 is a main body.

As described above, in the BS retransmitting device according to the present invention, the retransmitting units 10A and 10B, the power source and the like are integrally housed in one case, which is different from the conventional type shown in FIG. You can see that it is compact.

[0042]

[Effect of device]

 As described above, according to the present invention, a channel selection means for selecting a desired channel from the input BS signal and a demodulation means for demodulating the BS signal selected by the channel selection means into a predetermined signal. A modulation means for modulating the signal demodulated by the demodulation means by a single mixing section and transmitting it as a TV signal of a desired channel; and a control means 7 for controlling the tuning means and the modulation means. By having a re-transmission unit equipped with and, it becomes a BS re-transmission device with a simple structure, small size, low cost, and versatility.

Further, by providing the two retransmitting units and having a synthesizing means for synthesizing the TV output signals from the respective retransmitting units into two channels, it is necessary for a relatively small-scale joint reception facility. It is a simple, compact, so-called two-wave type, that is, two-channel retransmission device with various functions.

Further, by providing a discriminating means for transmitting the BS signal and the TV signal from the retransmission unit on the same line so as not to interfere with each other, the BS-IF signal can also be transmitted on the same line as the TV signal output. A BS receiver can directly receive BS broadcasts with a tuner receiver.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a BS retransmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a more specific configuration of a BS re-transmission device according to an embodiment of the present invention.

FIG. 3 is a diagram showing an external view of a BS re-transmission device according to the present invention.

FIG. 4 is a block diagram showing a basic configuration of a conventional BS retransmission device.

FIG. 5 is a diagram showing an external configuration of a conventional BS retransmission device.

FIG. 6 is a block diagram showing a configuration example of a modulator of a conventional BS retransmission device.

[Explanation of symbols]

1A, 1B BS input terminal (1A is an antenna input terminal) 2A, 2B BS output terminal 3 BS input terminal 4 channel selection means 5 demodulation means 6 modulation means 7 control means 8 input means 9 combining means 10A, 10B retransmission unit 12 discrimination Means 13 Distribution means 14 RF output terminal 15 RF monitor output terminal 16, 17 Jumper

Continued Front Page (72) Inventor Terumasa Tokumoto 2-2-1 Jinnan, Shibuya-ku, Tokyo Broadcasting Center Japan Broadcasting Center (72) Hiroki Niwa 2-2-1 Jinnan, Shibuya-ku, Tokyo Japan Broadcasting Association Inside the broadcasting center

Claims (4)

[Scope of utility model registration request] 1. A channel selection means for selecting a desired channel from an input BS signal, a demodulation means for demodulating the BS signal selected by the channel selection means into a predetermined signal, and this demodulation means. Retransmission unit including a modulation means for processing the demodulated signal, directly modulating the single mixing section and transmitting as a TV signal of a desired channel, and a control means for controlling the tuning means and the modulation means. A BS re-transmission device comprising: 2. The tuning means is a BS tuner and an AFC.
And a demodulation means for demodulating the output signal from the BS tuner.
It has demodulation means and PCM demodulation means for performing audio demodulation, and the modulation means is a TV multiplex encoder for modulation of TV audio, level adjustment of video signals and F of audio signals.
A signal processing circuit for modulating M, a synthesizing unit for synthesizing the video signal and the audio signal, and a single mixing unit for converting the output of the synthesizing unit into a predetermined frequency by the output from the oscillator, 2. The BS re-transmission device according to claim 1, further comprising: an input unit for giving the setting data of the BS channel and the channel of the TV signal to be re-transmitted to the control unit by the switch. 3. The synthesizing means having two retransmitting units and synthesizing TV output signals from the respective retransmitting units into two channels, according to claim 1 or 2. BS retransmission device. 4. A discriminating means for transmitting the BS signal and the TV signal from the retransmitting unit on the same line so as not to interfere with each other, respectively. BS retransmission device.