JPH10200437A - Headend for joint reception - Google Patents

Abstract

(57) [Summary] [Problem] Vertical / horizontal polarization signals of CS broadcasting, BS, UH
Even when receiving signals of F and VHF, there is no need to wire a plurality of coaxial cables to each TV terminal.
To build an inexpensive joint reception system by transmitting data over a single coaxial cable. A frequency converter 27 converts a vertical polarization reception signal (CSV) input from a vertical polarization input terminal 18 and a horizontal polarization reception signal (CSH) input from a horizontal polarization input terminal 19 into frequency converters 27 and. The frequency is converted to an IF signal higher than the frequency band of the BS broadcast by 28, and C signals corresponding to the number of the jointly received televisions are passed through the distributors 29 and 30.
The signals are supplied to the SV / H switches 31a to 31d, and the frequency-converted (CSV) and (CSH) are switched and output according to a vertical / horizontal reception switching control signal interlocked with the channel selection operation in the CS tuner. , And BS / U / V mixed signals, and transmitted from the mixed output terminals 23a to 23d to the corresponding television terminals via one coaxial cable Ca1 to Ca4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint receiving headend used for, for example, arbitrarily selecting and viewing CS, BS, UHF, and VHF broadcasts on a plurality of televisions, for example.

[0002]

2. Description of the Related Art Generally, in a joint receiving system in which a broadcast signal received by one broadcast antenna is distributed to a plurality of televisions and independently viewed, for example, when a BS broadcast, a UHF broadcast, and a VHF broadcast are viewed. , A BS signal, a UHF antenna, and a VHF antenna, the broadcast signals having different frequency bands are mixed by a mixer, and then supplied to a plurality of television sets via a distributor. signal,
The configuration is such that the VHF broadcast signal is split and viewed.

[0003] In this case, the BS broadcast signal, UHF broadcast signal, and VHF broadcast signal can be mixedly transmitted by one coaxial cable and supplied to each of a plurality of televisions.

On the other hand, the BS broadcast, UHF broadcast, VHF
When receiving a CS broadcast in addition to the broadcast, the C
S-broadcast vertical and horizontal polarization signals, as well as BS
Since it is in the same frequency band as the broadcast signal, it cannot be mixed and transmitted using a single coaxial cable, and the vertically polarized signal and the horizontally polarized signal of the CS broadcast are transmitted to each of a plurality of televisions. And a single coaxial cable transmitting a mixed signal of BS, UHF, and VHF, and a total of three coaxial cables are wired.

[0005] Further, when receiving a limited CS broadcast channel, the CS broadcast signal of the limited channel is transmitted in B
By performing frequency conversion to a frequency band above the S-IF band and mixing it with a BS broadcast signal, joint reception is performed using one coaxial cable.

[0006]

However, in the conventional joint receiving system, when receiving both a vertical / horizontal polarization signal of a CS broadcast signal and a BS broadcast, each of a plurality of televisions is required. Since it is necessary to wire three coaxial cables, there is a problem that the wiring work of the cable becomes complicated, the cost of the members involved increases, and the system becomes an expensive joint receiving system.

In the case of receiving a limited number of CS broadcast channels, an inexpensive joint receiving system for mixed transmission using a single coaxial cable can be constructed, but any CS channel according to the viewer's desire can be used. There is a problem that cannot be received.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a plurality of coaxial cables are required even when receiving a vertical / horizontal polarization signal of a CS broadcast, a BS broadcast signal, a UHF signal, and a VHF signal. It is an object of the present invention to provide a joint receiving headend that can construct an inexpensive joint receiving system by transmitting with one coaxial cable without having to wire and transmit.

[0009]

In other words, a joint receiving headend according to claim 1 of the present invention mixes a CS reception signal, a BS reception signal, a UHF reception signal, and a VHF reception signal and distributes the mixed signals to a plurality of terminals. A frequency converter for receiving the CS vertical polarization reception signal and the CS horizontal polarization reception signal, and respectively converting the frequency into an IF signal higher than the frequency band of the BS broadcast; A distributor for distributing the vertically-polarized reception signal and the horizontally-polarized reception signal, each of which has been frequency-converted by the converter, to the plurality of terminals, respectively, is provided for the plurality of terminals, each of which is provided by the distributor. A pair of the distributed vertical polarization reception signal and horizontal polarization reception signal is input, and the vertical / water signals given according to the channel selection operation in the CS tuner of the corresponding terminal. A switch for switching and outputting the input vertical polarization reception signal and horizontal polarization reception signal in accordance with a reception switching control signal; and a vertical polarization reception signal or a horizontal polarization reception signal which is respectively switched and output from the plurality of switches. And a plurality of mixers for mixing a mixed signal of a BS reception signal, a UHF reception signal, and a VHF reception signal, and a reception mixed signal mixed in each of the plurality of mixers between a corresponding terminal. And a plurality of mixed output terminals provided to connect and transmit one coaxial cable.

That is, in the joint receiving headend according to the first aspect of the present invention, the vertically polarized wave receiving signal and the horizontally polarized wave receiving signal received and input by the CS antenna are IF (higher than the BS broadcast frequency band). The frequency-converted signal is converted into an intermediate frequency signal, and the frequency-converted vertical polarization reception signal and horizontal polarization reception signal are distributed to a plurality of terminals one by one and input to each switch. And in each switch,
The input vertical polarization reception signal and horizontal polarization reception signal are switched and output according to a vertical / horizontal reception switching control signal given in response to a channel selection operation in the CS tuner of the corresponding terminal, and the switching output is performed. The vertically or horizontally polarized reception signal,
The received signal, the UHF received signal, and the mixed signal of the VHF received signal are mixed, and the received mixed signal is transmitted to the corresponding terminal via one coaxial cable. The CS vertical polarization or horizontal polarization reception signal frequency-converted to an IF signal higher than the band and the BS reception signal, UHF reception signal, and VHF reception signal are simply demultiplexed, and all are connected by one coaxial cable wiring. Will be able to view the CS channel.

The joint receiving headend according to a second aspect of the present invention is the joint receiving headend according to the first aspect, wherein the joint receiving headend is provided to a switch in accordance with a channel selection operation in a CS tuner of the terminal. Vertical given
The horizontal reception switching control signal is superimposed on a downstream reception mixed signal of a coaxial cable connected between the CS tuner and the mixing output terminal and transmitted.

In other words, in the joint receiving headend according to the second aspect of the present invention, the vertical / horizontal reception switching control signal according to the channel selection operation in the CS tuner is transmitted from the CS tuner to the switching unit by the mixed output terminal. Is transmitted by being superimposed on the downstream reception mixed signal of the coaxial cable connected between the transmission line and the vertical polarization reception signal / horizontal polarization reception signal without complicating the wiring. become.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a CS / BS / UHF / VHF according to an embodiment of the joint receiving headend of the present invention.
It is a figure showing the composition of a joint receiving system.

This joint receiving system includes a vertical / horizontal polarization output CS antenna 11, a BS antenna 12, a UHF antenna 13, a VHF antenna 14, a joint receiving headend 15, and, for example, four BS built-in televisions 16a.
To 16d and their attached CS tuners 17a to 17d.

The CS vertical polarization reception signal (CSV) and the CS horizontal polarization reception signal (C
SH) is supplied to the vertical polarization input terminal 18 and the horizontal polarization input terminal 19 of the joint reception head end 15, respectively.

The BS reception signal received by the BS antenna 12 is supplied to a BS / UV mixer 20.
The UHF reception signal received by the UHF antenna 13 and the VHF reception signal received by the VHF antenna 14 are supplied to a U / V mixer 21 and the U / V mixer 21
Is mixed with the BS / U · V
It is supplied to the mixer 20.

The BS / U / V mixed signal mixed by the BS / UV mixer 20 is supplied to a BS / UHF / VHF mixed input terminal 22 of the joint receiving head end 15.

The joint receiving head end 15 is, for example, 4
And four mixed output terminals 23a to 23d. Each of the mixed output terminals 23a to 23d has
TV terminals 24a to 24 corresponding to a to 16d, respectively
d are connected via one coaxial cable Ca1 to Ca4.

The television terminals 24a to 24d have CS / BS, U, and V demultiplexers 25 for each of the televisions 16a to 16d.
a to 25d are connected, and the CS reception signals demultiplexed in each of the CS / BS U / V demultiplexers 25a to 25d are supplied to the corresponding CS tuners 17a to 17d. The mixed signal has the corresponding BS / U
It is supplied to V splitters 26a to 26d.

Then, each BS / U / V demultiplexer 26a-2
The BS reception signal and the UHF / VHF reception signal demultiplexed by 6d are respectively transmitted to the corresponding BS built-in televisions 16a-1
6d.

The BS built-in televisions 16a to 16d respectively provide a CS reception signal, a BS reception signal, and a UH corresponding to the CS channel selected by the CS tuners 17a to 17d.
It has a function of selecting and reproducing an F reception signal and a VHF reception signal, and the CS tuners 17a to 17d have a function of selecting a CS channel and cooperate with the selection operation of the CS channel in response to the selection operation of the CS channel. A vertical / horizontal polarization reception switching control signal for switching and inputting a vertical polarization reception signal (CSV) or a horizontal polarization reception signal (CSH) is output to a corresponding CS / BS / U / V demultiplexer 25.
It has a function of superimposing on the coaxial cables Ca1 to Ca4 from a to 25d and sending out to the joint receiving head end 15.

Each of the mixed output terminals 23a to 23d of the joint receiving head end 15 has a vertical polarization / horizontal polarization reception switching control signal transmitted from the corresponding CS tuner 17a to 17d. Polarization reception signal (CSV) or horizontal polarization reception signal (CSH) and B
A mixed signal (CSV / H · BS · U · V) of the S received signal / UHF received signal / VHF received signal is output and mixed with this mixed signal (CSV / H · BS · U · V). Both the vertically polarized wave reception signal (CSV) and the horizontally polarized wave reception signal (CSH) are converted into B signals by frequency converters 27 and 28 (see FIG. 2) incorporated in the joint reception head end 15.
The frequency is converted to an IF (intermediate frequency) signal higher than the frequency band of the S broadcast.

FIG. 2 is a diagram showing the internal configuration of the joint receiving headend 15 disposed between the joint antenna group and each television receiving terminal in the joint receiving system. CS vertical polarization reception signal (CSV) input from the vertical polarization input terminal 18, C input from the horizontal polarization input terminal 19
The S horizontal polarized wave reception signal (CSH) is supplied to the corresponding frequency converters 27 and 28, respectively.

The frequency converters 27 and 28 convert the supplied CS vertical polarization reception signal (CSV) or horizontal polarization reception signal (CSH) into I higher than the BS broadcast frequency band.
The frequency-converted signal is converted into an F (intermediate frequency) signal. The CS vertical polarization reception signal (CSV) frequency-converted by the frequency converter 27 is distributed to four CSV / H switches 31a to 31d via a distributor 29. The CS horizontal polarization reception signal (CSH) supplied and similarly frequency-converted by the frequency converter 28 is transmitted via the divider 30 to the four CSV / H signals.
It is distributed and supplied to the switches 31a to 31d.

The CSV / H switches 31a to 31d are respectively connected to the corresponding TV-side CS tuners 17a to 17d.
And a vertical-polarized / horizontal-polarized-wave reception switching control signal superimposed on the downstream transmission signal and transmitted via the corresponding coaxial cables Ca1 to Ca4 from the corresponding CS vertical-polarized reception signal (CSV) after frequency conversion. Or horizontal polarization reception signal (CSH)
And each of the CSV / H switches 3
1a to 31d, the CS vertical polarization reception signal (CSV) or the horizontal polarization reception signal (CSH) individually output.
) Is supplied to each corresponding mixer 33a-33d,
The signal is input from the BS / UHF / VHF mixing input terminal 22 and mixed with the BS / U / V mixing signal distributed by the distributor 32, and output from the respective mixing output terminals 23a to 23d.

Next, the CS / BS / UHF with the above configuration
-The receiving operation in the VHF joint receiving system will be described. CS vertical polarization reception signal (CSV) received by the vertical / horizontal polarization output CS antenna 11 and input from the vertical polarization input terminal 18 of the joint receiving head end 15.
Is supplied to the frequency converter 27, frequency-converted to an IF (intermediate frequency) signal higher than the frequency band of the BS broadcast, and transmitted via the distributor 29 to the four CSV / H switches 31a to 31d.
To be distributed.

The CS horizontal polarization reception signal (CSH) received by the vertical / horizontal polarization output CS antenna 11 and input from the horizontal polarization input terminal 19 of the joint receiving head end 15 is converted into a frequency converter 28. , And is frequency-converted into an IF (intermediate frequency) signal higher than the frequency band of the BS broadcast, and the four CSV / H switches 31 via the distributor 30
a to 31d.

BS antenna 12, UHF antenna 13,
The BS / U / V mixed signals respectively received by the VHF antenna 14 and mixed by the U / V mixer 21 and the BS / U / V mixer 20 are sent to four mixers 33a to 33d via the splitter 32. Distributed and supplied.

Then, for example, C of the TV 16a with a built-in BS
When an arbitrary CS channel is selected by the S tuner 17a, a vertical polarization / horizontal polarization reception switching control signal for receiving a horizontal polarization or a vertical polarization corresponding to the selected channel in conjunction with the channel selection operation. Is superimposed on the downstream received transmission signal on the coaxial cable Ca1 and sent to the CSV / H switch 31a of the joint receiving headend 15, when B is supplied to the CSV / H switch 31a.
CS vertically polarized reception signal (CSV) or C converted to an IF (intermediate frequency) signal higher than the frequency band of S broadcast
One of the S horizontal polarization reception signals (CSH) is switched and selected and output, and the BS / U ·
It is mixed with the V mixing signal.

Then, the mixed output terminal 23a of the joint receiving headend 15 is supplied to the vertical polarization reception signal (CSV) switched according to the vertical polarization / horizontal polarization reception switching control signal from the CS tuner 17a. Alternatively, a mixed signal (CSV / H.BS.UV) of the horizontally polarized reception signal (CSH) and the BS / .UV mixed signal is output and supplied to the television terminal 24a via the coaxial cable Ca1. .

As a result, the CS / BS / U / V splitter 25a splits the vertically polarized reception signal (CSV) or the horizontally polarized reception signal (CSH) corresponding to the selected channel into the CS tuner 17a. , And any CS channel can be received and viewed.

Therefore, the CS / BS / UH of the above configuration
According to the F / VHF joint reception system, a CS vertical polarization reception signal (CSV) received by the vertical / horizontal polarization output CS antenna 11 and input from the vertical polarization input terminal 18.
And the CS horizontal polarization reception signal (CSH) input from the horizontal polarization input terminal 19,
28, converts the frequency into an IF (intermediate frequency) signal higher than the frequency band of the BS broadcast, and via the distributors 29 and 30, the CSV / H switches 31a to 31d for the number of the joint reception televisions.
And the CSV / H switches 31a to 31d
The frequency-converted vertically polarized reception signal (C
SV) and the horizontal polarization reception signal (CSH) are switched and output according to a vertical polarization / horizontal polarization reception switching control signal transmitted in conjunction with the channel selection operation in the CS tuners 17a to 17d. 33a-33d further mixes with the BS / UV mixed signal,
・ BS / UV mixed signal mixed output terminals 23a-23d
Is supplied to each of the corresponding television terminals 24a to 24d via one coaxial cable Ca1 to Ca4, so that a plurality of televisions can be supplied by signal transmission via one coaxial cable Ca, respectively. All CS broadcast channels, BS broadcasts, UHF broadcasts, VHF broadcasts can be selected and viewed arbitrarily, and there is no complication of wiring work and no increase in material costs associated therewith, and inexpensive joint reception The system can be realized.

[0033]

As described above, according to the joint receiving headend according to the first aspect of the present invention, the vertical polarization reception signal and the horizontal polarization reception signal received and input by the CS antenna are transmitted by BS broadcasting. , And the frequency-converted vertical polarization reception signal and horizontal polarization reception signal are distributed one by one to a plurality of terminals, and each switch is switched. Is input to In each switch, the input vertical polarization reception signal and horizontal polarization reception signal are switched according to a vertical / horizontal reception switching control signal given according to a channel selection operation in a CS tuner of a corresponding terminal. The vertically-polarized reception signal or the horizontally-polarized reception signal output and switched and mixed with the BS reception signal, the UHF reception signal, and the VHF reception signal are mixed, and the reception mixed signal is transmitted to a corresponding terminal. The terminal transmits on the terminal side the CS vertical polarization or horizontal polarization reception signal, the BS reception signal, and the UHF reception signal, which are frequency-converted into IF signals higher than the BS broadcast frequency band. , VHF reception signals, it is possible to view all CS channels with one coaxial cable wiring.

According to the joint receiving headend according to the second aspect of the present invention, the vertical / horizontal reception switching control signal corresponding to the channel selection operation in the CS tuner is transmitted from the CS tuner to the switching unit. Since the signal is superimposed on the downstream reception mixed signal of the coaxial cable connected to the output terminal and transmitted, the switching control of the vertical polarization reception signal / horizontal polarization reception signal can be performed without complicating the wiring. Become so.

Therefore, the vertical / horizontal polarization signal of the CS broadcast,
Even when receiving a BS broadcast signal, a UHF signal, or a VHF signal, it is possible to construct an inexpensive joint reception system by transmitting with one coaxial cable without having to wire and transmit a plurality of coaxial cables. Become.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a CS / BS / UHF / VHF joint reception system according to an embodiment of a joint reception head end of the present invention.

FIG. 2 is a diagram showing an internal configuration of a joint receiving head end provided between a common antenna group and each television receiving terminal in the joint receiving system.

[Explanation of symbols]

 Reference numeral 11: a vertical / horizontal polarization output CS antenna; 12, a BS antenna; 13, a UHF antenna; 14, a VHF antenna; 18 vertical polarization input terminal, 19 horizontal polarization input terminal, 20 BS / U / V mixer, 21 U / V mixer, 22 BS / UHF / VHF mixed input terminal, 23a to 23d mixed Output terminals, 24a to 24d: TV terminals, 25a to 25d: CS / BS / UV splitters, 26a to 26d: BS / UV splitters, 27, 28: Frequency converters, 29, 30, 32 ... 4 distributor, 31a-31d ... CSV / H switcher, 33a-33d ... mixer.

Claims (2)

[Claims] 1. A joint receiving head end for mixing a CS reception signal, a BS reception signal, a UHF reception signal, and a VHF reception signal and distributing the mixed signals to a plurality of terminals, comprising a CS vertically polarized reception signal and a CS horizontal reception signal. A frequency converter that receives the polarization reception signal and converts the frequency into an IF signal that is higher than the frequency band of the BS broadcast, and the vertical polarization reception signal and the horizontal polarization reception signal that are frequency-converted by the frequency converter, respectively. A distributor for distributing the plurality of terminals, a plurality of terminals, each of which is provided with a plurality of terminals, each of which receives a pair of a vertically polarized wave receiving signal and a horizontally polarized wave receiving signal distributed by the distributing unit; , The vertical /
A switch for switching and outputting between the input vertical polarization reception signal and horizontal polarization reception signal according to a horizontal reception switching control signal; and a vertical polarization reception signal or horizontal polarization reception switched and output from each of the plurality of switches. Signal, BS reception signal,
A plurality of mixers for mixing a UHF reception signal and a mixed signal of a VHF reception signal, and one coaxial cable between each of the plurality of mixers and the corresponding mixed reception signal to a corresponding terminal. A joint receiving headend comprising: a plurality of mixed output terminals provided for connection and transmission. 2. A vertical / horizontal reception switching control signal applied to a switch in response to a channel selection operation in a CS tuner of the terminal is transmitted to a downstream of a coaxial cable connected between the CS tuner and the mixed output terminal. The joint reception headend according to claim 1, wherein the combined reception signal is transmitted by being superimposed on the received mixed signal.