JPH07106997A - Handy head end device - Google Patents

Abstract

PURPOSE:To transmit a satellite broadcast intermediate frequency signal and a satellite communication intermediate frequency signal that have the overlapping frequency bands by means of a single coaxial cable. CONSTITUTION:A satellite broadcast intermediate frequency signal BS-IF and the satellite communication intermediate frequency signals CS-IF1 and CS-IF2 which have the overlapping frequency bands are supplied to the input terminals 45, 46 and 47 respectively. The signal BS-IF is amplified by an amplifier 62, mixed with the VHF and UHF band TV broadcast signals by a mixer 52 and distributed to the mixers 78 and 80 by a distributor 76. The signals CS-IF1 and CS-IF2 are converted into the signals CS-IF1 and CS-IF2 of different output frequency from the BS-IF by the block converters 68 and 74 and then supplied to the mixers 78 and 80. The outputs of both mixers 78 and 80 are distributed by the 4-distributors 82 and 83 and supplied to the fixed contacts 84a, 86a, 88a, 90a, 84b, 86b, 88b, and 90b of the changeover switches 84, 86, 88 and 90 respectively. Then the mobile contacts 84c, 86c, 88c and 90c of the switches 84-90 are connected to the output terminals 92, 94, 96 and 98 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simplified head-end device for use in, for example, an apartment house consisting of a plurality of rooms or a small number of rooms in one household, and particularly to satellite signals such as satellite broadcast signals and satellite communication signals. Regarding what can be received.

[0002]

2. Description of the Related Art Conventionally, as a simplified headend device, there is one shown in FIG. 4, for example. This is VH
The F and UHF television broadcast signals and the satellite broadcast signals are respectively distributed to the four rooms, and satellite communication signals from a plurality of satellites which are different only in a specific room are supplied.

That is, the VHF band television broadcast signal is
The signal is received by the VHF band receiving antenna 2 and the amplifier 4 is received.
And then supplied to the mixer 6. Similarly, the UHF band television broadcast signal is also received by the UHF band receiving antenna 8, amplified by the amplifier 10, and then supplied to the mixer 6. Further, the satellite broadcast signal received by the satellite dish receiving parabolic antenna 12 is frequency-converted into a satellite broadcast intermediate frequency signal by a converter 14 attached to the antenna 12, and an amplifier 16 is provided.
And then supplied to the mixer 6. The mixed output signal of the mixer 6 is divided into 4 by the 4 divider 18, and the divided outputs are supplied to the terminal terminals 19, 20, 21, 22 provided in different rooms.

The mixed output signal supplied to each terminal terminal is, for example, as shown in connection with the terminal terminal 22, a satellite broadcasting intermediate frequency signal and a UHF band and VHF band television signal by a demultiplexer 24. The satellite broadcast intermediate frequency signal is demultiplexed into
Is supplied to the television receiver 28 and is demodulated into a baseband video signal and an audio signal. Also, U
The HF band and VHF band television broadcast signals are demultiplexed by the demultiplexer 25 into UHF band and VHF band television broadcast signals, respectively, and supplied to the television receiver 28 where they are demodulated.

Further, satellite communication signals transmitted from different geostationary satellites, which are received by the parabolic antennas 30 and 32 for satellite communication reception, are received by these antennas 30 and 3, respectively.
2 are converted into satellite communication intermediate frequency signals by converters 34 and 36 attached to the terminal 2, and are supplied to, for example, terminal terminals 38 and 40 provided in the same room as the terminal terminal 22, and satellites are supplied from these terminal terminals 38 and 40. It is supplied to the tuner 26 for receiving broadcast and satellite communication.

[0006]

However, in such a simplified head-end device, when an attempt is made to receive satellite broadcast and satellite communication, a tuner for receiving satellite broadcast and satellite communication is coaxially connected to the terminal terminals 38 and 40 by a coaxial cable. 26 is connected to the terminal terminal 22 with another coaxial cable 24
Therefore, there is a problem that the work of connecting the plurality of coaxial cables is troublesome.

Further, in this simplified headend device,
Satellite communication can be received only in the room provided with the terminal terminals 22, 38, and 40. This can be solved by distributing the satellite communication intermediate frequency signals from the converters 34 and 36 to each room by using a distributor. In each room, each terminal terminal is connected to a satellite broadcasting and satellite communication receiving tuner or a duplexer. The fact that they have to be connected to each other via coaxial cables is still unsolved.

The satellite broadcast intermediate frequency signal and the satellite communication intermediate frequency signal are respectively supplied to the terminal terminals 22, 38 and 40.
From the satellite broadcasting intermediate frequency signal, for example, 15 channels are 1304.50 to 133.
1.50 MHz, which is one of the satellite communication intermediate frequency signals
For example, the J1 to J7 channels from the communication satellite JCSAT are 1309.75 to 1426.75 MHz,
For example, the S1 to S7 channels from the communication satellite Super Bird are 1312 to 1468 MHz, and the frequency bands of these intermediate frequency signals overlap, so that they are mixed and satellite broadcasting and satellite communication reception are performed by one coaxial cable. This is because when it is supplied to a tuner or the like, interference occurs.

[0009]

In order to solve the above problems, in the first aspect of the present invention, a plurality of satellite signals are supplied to a plurality of input terminals. These satellite signals have overlapping frequency bands. A plurality of switching means are provided in which movable contacts are respectively connected to the plurality of output terminals. Each of these switching means has the same number of fixed contacts as the input terminals. Distribution means is provided for distributing the satellite signals respectively supplied to the input terminals to corresponding fixed contacts of the switching means. It is also possible to mix at least one of the satellite signals with a broadcast signal having a frequency different from that of the satellite signal.

In the second aspect of the present invention, among three or more satellite signals having frequency bands overlapping with each other, each satellite signal other than the reference satellite signal serving as a reference has an output frequency different from that of the reference satellite signal. A plurality of frequency converting means for respectively converting, mixing means for mixing each output signal of these frequency converting means and the reference satellite signal, distributing means for distributing the output of each mixing means to a plurality, and each distributing means. A plurality of switching means for respectively switching the output signals of the means. It is also possible to mix at least one of the satellite signals with a broadcast signal having a frequency different from that of the satellite signal.

According to a third aspect of the present invention, among the three or more satellite signals that overlap in the frequency band, each satellite signal other than the reference satellite signal serving as a reference is output to an output frequency that is a frequency different from the reference satellite signal. A plurality of frequency converting means for converting respectively, a plurality of distributing means for distributing the output signals of the frequency converting means, a plurality of switching means for switching respective distribution output signals of different distributing means, and an output signal of each switching means. And mixing means for mixing the above-mentioned reference satellite signal. It is also possible to mix at least one wave of each satellite signal with a broadcast signal having a frequency different from that of each satellite signal.

[0012]

According to the first aspect of the present invention, the plurality of satellite signals supplied to the plurality of input terminals are distributed by the distributing means and supplied to the fixed contacts of the switching means. By connecting the movable contact of each switching means to one of the fixed contacts, one wave out of a plurality of satellite signals that overlap each other in the frequency band is output to the output terminal.

According to the second aspect of the present invention, three or more satellite signals having frequency bands overlapping each other, for example, satellite signals B and C other than the reference satellite signal A among A, B and C are processed by the respective frequency conversion means. , And output signals B1 and C1 having the output frequency are frequency-converted. The output signal of the frequency conversion means, for example B1, is
It is mixed with the reference satellite signal A by the mixing means and further distributed by the distribution means. Similarly, the output signal C1 of the frequency converting means is mixed with the reference satellite signal A by the mixing means and further distributed by the distributing means. The output signal of each distributing means is respectively supplied to the switching means, and the output signal of any one of the distributing means is output by the switching operation of the switching means. Therefore, the reference satellite signal A and the output signal B1
And a mixed signal of the reference satellite signal A and the output signal C1 are output from the switching means.

According to the third aspect of the present invention, among three or more satellite signals, for example, satellite signals other than the reference satellite signal A out of A, B and C, C is an output signal having an output frequency different from that of the reference satellite signal A. The frequency is converted into B1 and C1 by the frequency conversion means. Output signals B1 and C1 of these frequency conversion means
Are distributed by each distribution means. The distribution outputs B1 and C1 of each distribution means are supplied to each switching means, and the distribution output B1 or C1 of either distribution means is output by the operation of the switching means, and this and the reference satellite signal are mixed by the mixing means. Is output. Therefore, the reference satellite signal A and the output signal B1 of the frequency conversion means are output from each mixing means.
Or a mixed signal of the reference satellite signal A and the output signal C1 of the frequency conversion means is output.

[0015]

EXAMPLE A first example is shown in FIG. The simplified headend device 42 of this embodiment has all the components housed in one housing and has input terminals 43 to 47. The VHF band television broadcast signal received by the VHF band television broadcast receiving antenna 48 is supplied to the input terminal 43, which is supplied via the amplifier 50 to the mixer 52.
Is supplied to. Similarly, the UHF band television broadcast signal received by the UHF band television broadcast receiving antenna 54 is supplied to the mixer 52 via the input terminal 44 and the amplifier 56. Furthermore, satellite dish 5 for satellite broadcasting reception
The satellite broadcast signal received by 8 is transmitted by the converter 60 attached to the antenna 58 from 1035.98 to 133.
The frequency is converted into a satellite broadcasting intermediate frequency signal BS-IF of 15 channels in total at 1.50 MHz, and the input terminal 4
5, supplied to the mixer 52 via the amplifier 62.

Further, a satellite dish 6 for satellite communication reception
The satellite communication signals of channels J1, J3, J5, and J7 received from the communication satellite JCSAT, for example, by the converter 66 attached to the antenna 64 are, for example, 13
The frequency is converted into the satellite communication intermediate frequency signal CS-IF1 of 09.75 MHz to 1426.275 MHz and supplied to the block converter 68 via the input terminal 46. 1741.75M
The frequency is converted into the satellite communication intermediate frequency signal CS-IF1a of Hz. JC22, JC24, JC26, JC
Channel 28 is an expansion channel, which is a special channel that is not normally transmitted by these satellites from communication satellites, but is set up for use in community hearing facilities.

Further, a satellite dish 7 for satellite communication reception.
0 receives satellite communication signals of channels S1, S3, S5 from, for example, a communication satellite Super Bird by a converter 72 attached to the antenna 70, for example, 131
Satellite communication intermediate frequency signal C of 2 MHz to 1428 MHz
The frequency is converted to S-IF2, supplied to the block converter 74 via the input terminal 47, and 1632M corresponding to expansion channels, for example, S17, S19, and S21.
Hz to 1748 MHz satellite communication intermediate frequency signal CS-
The frequency is converted to IF2a.

The satellite communication intermediate frequency signal CS-IF1 partially overlaps with the reference satellite broadcast intermediate frequency signal BS-IF in the frequency band. The frequency is converted into the CS-IF 1a having a frequency band different from the frequency band.
Similarly, the satellite communication intermediate frequency signal CS-IF2 partially overlaps with the satellite broadcast intermediate frequency signal BS-IF in frequency band, but the block converter 74 causes the satellite communication intermediate frequency signal BS-IF to overlap with the frequency band of the satellite broadcast intermediate frequency signal BS-IF. C in different frequency bands
The frequency is converted to S-IF2a.

Mixing output from the mixer 52 (VHF, UH
The mixed output of the F-band television broadcast signal and the satellite broadcast intermediate frequency signal is divided into two by the two-way divider 76, and the mixer 7
8 and 80 are supplied.

The mixer 78 includes a block converter 68.
The output signal CS-IF1a of the mixer 7 is also supplied to the mixer 7
8 mixes both. Similarly, the output signal CS-IF2a of the block converter 74 is also supplied to the mixer 80, and the mixer 80 mixes both.

The mixed output of the mixer 78 is divided into four by the four divider 82. These distribution outputs have the same number of changeover switches 84, 86, 8 as the distribution numbers.
8, 90 fixed contacts 84a, 86a, 88a, 90a. Further, the mixed output of the mixer 80 is divided into four by the four divider 83. These distributed outputs are the fixed contacts 84b, 86 of the changeover switches 84, 86, 88, 90.
b, 88b, 90b. These changeover switches 84, 86, 88 and 90 are block converters 68,
It has the same number of fixed contacts as the number of 74.

These changeover switches 84, 86, 88, 9
The movable contacts 84c, 86c, 88c, 90c of 0 are connected to the output terminals 92, 94, 96, 98, respectively.

Therefore, for example, when the movable contact 86c is switched to the fixed contact 86a, the mixer 5 is attached to the movable contact 86c.
VHF band and UHF band television broadcast signals from 2
A signal obtained by mixing the satellite broadcast intermediate frequency signal and the satellite communication intermediate frequency signal CS-IF1a from the block converter 68 is output.

When the movable contact 86c is switched to the fixed contact 86b, the movable contact 86c receives the VHF band and UHF band television broadcast signals and the satellite broadcast intermediate frequency signal from the mixer 52 and the satellite from the block converter 70. A signal mixed with the communication intermediate frequency signal CS-IF2a is output. The satellite communication intermediate frequency signals CS-IF1a and CS-IF2a have frequency bands overlapping with each other, but since these are supplied to different fixed contacts of one changeover switch, for example, fixed contacts 84a and 84b, Both are not output at the same time, and there is no particular problem.

The output terminals 92, 94, 96 and 98 are terminal terminals provided in different rooms via one coaxial cable 100 (in FIG. 1, the terminal terminal 1 associated with the output terminal 94 is shown).
Only 02 is shown. ) Is supplied to the satellite broadcasting / satellite communication intermediate frequency signal and the UHF band and VHF band television broadcasting signal by the demultiplexer 104. Baseband video and audio signals are demodulated by the communication tuner 106, and these are supplied to the television receiver 108. Further, the UHF band and VHF band television broadcast signals demultiplexed by the demultiplexer 104 are combined with the UHF band television broadcast signal by the demultiplexer 110, and V
The signals are demultiplexed into HF band television broadcast signals and supplied to the UHF input terminal and the VHF input terminal of the television receiver 108, respectively.

The changeover switches 84, 86, 88,
Although 90 can be manually switched,
It is also possible to switch automatically. For example, the changeover switches 84, 86, 88, 90 are provided with voltage detectors 200 in the headend as shown in FIG.
At the time of receiving T, a DC voltage + 15V is supplied from the satellite broadcasting and satellite communication tuner 106 to the voltage detector 200 via a coaxial cable, and the voltage detection signal generated by the voltage detector 200 causes the movable contact c of the changeover switch to JC
The satellite communication intermediate frequency signal CS-IF1a from the SAT is switched to the fixed contact a side supplied from the distributor 82. Furthermore, when receiving Super Bird, the tuner 106
Since no DC voltage is supplied from the voltage detector 200,
No voltage is detected in. Therefore, the movable contact c of the changeover switch is switched to the fixed contact b side to which the satellite communication intermediate frequency signal CS-IF2a from Super Bird is supplied from the distributor 83. Furthermore, when Super Bird is received as a DC voltage, a DC voltage of + 6V
At the time of AT reception, a DC voltage of +2 V may be supplied from the tuner 106 to the voltage comparison circuit provided in the head end via the coaxial cable, and the changeover switch may be automatically changed over. Of course, in these cases, the duplexer 104 is an energization type.

In addition to supplying the DC voltage, the value of the DC voltage supplied in advance may be changed or a pulse signal may be supplied. Of course, in that case, the detecting means on the side of the changeover switch is changed to the detecting means of the DC voltage or the detecting means of the pulse signal.

Further, in the above embodiment, VHF and UH
The F-band television broadcast signal and the satellite broadcast intermediate frequency signal were mixed by the mixer 52. The mixer 52 is provided on the output side of the block converter 68 or 74, and V
The HF and UHF band television broadcast signals are mixed with the output signal of the block converter 68 or 74 and the satellite broadcast intermediate frequency signal, the output of the mixer 52 is divided into two by the two dividers, and one output is divided into the four dividers. Is supplied to one fixed contact of each changeover switch via the 4th divider and mixed with the output signal of the block converter 74 or 68 and supplied to the other fixed contact of each changeover switch via the 4 divider. Good.
Further, the mixers 78 and 80 are removed so that the output signals of the block converters 68 and 74 are supplied to the 4 dividers 82 and 83, respectively, and the 2 divider 76 is changed to an 8 divider, and each changeover switch 84 is provided. , 86, 88, 90 fixed contacts 84a, 84b, 86a, 86b, 88a, 88b, 9
0a and 90b are respectively provided with mixers, and by these mixers, the distribution output of the 8 distributor and the distribution output of the distributor 82 are mixed and the distribution output of the 8 distributor and the distribution output of the distributor 83 are mixed. You may go. Although the VHF and UHF band television broadcast signals are input to the mixer 52 in the above embodiment, the VHF band television signal received by the VHF band receiving antenna and the UHF band receiving by the UHF band receiving antenna are received. UH TV signal
The signal mixed by the F and VHF mixers is BS-mixed by the mixer 52.
It may be mixed with IF.

FIG. 2 shows a second embodiment. In this embodiment, mixing of the mixed output signal from the mixer 52 and the output signals of the block converters 68 and 74 is performed by changing the movable contacts of the changeover switches 84, 86, 88 and 90 and the output terminal 92.
94, 96, and 98, respectively.

That is, instead of the two distributors 76, the four distributors 7
6a is provided, and the respective distribution outputs of the 4 distributor 82 are fixed contacts 84a, 86a, 8 of the changeover switches 84, 86, 88, 90.
8a, 90a, and each distribution output of the 4 distributor 83 is fixed contact 84b of changeover switches 84, 86, 88, 90,
Supply to 86b, 88b, 90b, and each changeover switch 8
4, 86, 88, 90 movable contacts 84c, 86c, 88
The output signals of c and 90c and the respective divided outputs of the four-way divider 76a are mixed by mixers 112, 114, 116 and 118, and are supplied to output terminals 92, 94, 96 and 98, respectively.

With this configuration, the number of mixers is slightly increased as compared with the first embodiment. However, the mixed output signal of mixer 52 is a four divider 76a in this embodiment.
According to the first embodiment, the output terminal 92, 94, 96, 98 is only divided into four, whereas in the first embodiment, it is divided into two.
Since each of the 6 and 4 distributors 82 and 83 divides into 4, the output terminals 92, 94, 96 and 98 are supplied in 8 divisions. Therefore, this embodiment has a smaller distribution loss, and each output terminal 92, 94, 96, 9
If the mixed output signal at 8 has the same output level as that of the first embodiment, the gains of the amplifiers 50, 56 and 62 can be made lower than that of the first embodiment.

Further, in the first embodiment, since the changeover switches 84, 86, 88, 90 pass both the mixed output signal of the mixer 52 and the output signals of the block converters 68, 74, they pass therethrough. However, in this embodiment,
Since the output signals of the block converters 68 and 74 only pass through the changeover switches 84, 86, 88 and 90, those having a narrow band can be used.

FIG. 3 shows a third embodiment. This embodiment is a mixed output of VHF band and UHF band television broadcast signals and satellite broadcast intermediate frequency signal BS-IF, JCSA.
Satellite communication intermediate frequency signal CS-I of satellite communication signal from T
The satellite communication intermediate frequency signal CS-IF2 of the satellite communication signal from F1 and Super Bird is switched to output terminal 9
2, 94, 96 and 98 respectively.

Therefore, the block converters 68, 74
Instead, amplifiers 120 and 122 are provided between the input terminal 46 and the four-way divider 82, and between the input terminal 47 and the four-way divider 83, respectively. Also, the changeover switch 8
Instead of 4, 86, 88, 90, changeover switches 124, 126, 128 and 1 each having three fixed contacts.
30 are provided.

Further, each changeover switch 124, 126,
128 and 130 fixed contacts 124a, 126a, 12
8a and 130a through 4 distributor 76a to mixer 5
Two mixed outputs are provided. The fixed contacts 124 of the changeover switches 124, 126, 128 and 130 are also included.
amplifiers 120 at b, 126b, 128b and 130b.
The output obtained by dividing the output of 4 by the 4 divider 82 is supplied. Further, the fixed contacts 124c, 126c, 128c and 1 of the changeover switches 124, 126, 128 and 130, respectively.
An output obtained by dividing the output of the amplifier 122 by the quad divider 92 is supplied to 30c. Further, the movable contacts 124 of the changeover switches 124, 126, 128 and 130 are
d, 126d, 128d and 130d are output terminals 9
2, 94, 96 and 98, respectively.

Therefore, for example, when the movable contact 124d is switched to the fixed contact 124a in the changeover switch 124, a mixed output of the VHF band and UHF band television broadcast signals and the satellite broadcast intermediate frequency signal BS-IF is output to the output terminal 92. Occurs. Similarly, the movable contact 124d is connected to the fixed contact 12
When switched to 4b, the satellite communication intermediate frequency signal CS-IF1 of the satellite communication signal from JCSAT is generated at the output terminal 92. Further, when the movable contact 124d is switched to the fixed contact 124c, the satellite communication intermediate frequency signal CS-IF2 of the satellite communication signal from Superbird is generated at the output terminal 92. The same applies to the other changeover switches 126, 128 and 130.

The satellite broadcasting intermediate frequency signal BS-IF and the satellite communication intermediate frequency signals CS-IF1 and CS-IF2 have overlapping frequency bands, but these intermediate frequency signals are simultaneously output to the output terminals 92, 94, 96 and 98. Since it does not occur, there is no problem and it is not necessary to use the block converters 68 and 74, and the cost can be gradually reduced.

In each of the above embodiments, the satellite broadcast intermediate frequency signal and the VHF band and UHF band television broadcast signal are mixed, but in addition to or instead of these, the F
M radio broadcast signals and CATV broadcast signals may be mixed. Further, in each of the above embodiments, four output terminals are provided, but the number of output terminals can be arbitrarily changed. In that case, the number of distributions of the distributors 76, 76a, 82, 83 can be changed. Good. Also in the second and third embodiments, the changeover switch can be automatically changed over as in the first embodiment.

[0039]

As described above, according to the first aspect of the present invention,
Since the plurality of satellite signals supplied to the respective input terminals and overlapping in the respective frequency bands are distributed by the distribution means and the distribution output from each distribution means is switched by the switching means, the output terminals have frequency overlaps. Since only one of the satellite signals is generated, only one coaxial cable is required when supplying it to the television receiver or the like from the output terminal. Therefore, the wiring work is facilitated, and since it is not necessary to frequency-convert each satellite signal into a different frequency, the circuit configuration is simplified and the cost can be gradually reduced.

Further, according to the second aspect of the present invention, the output frequencies of three or more satellite signals having overlapping frequency bands, for example, satellite signals B and C other than the reference satellite signal A among A, B and C are output frequencies. Since the frequency distribution is converted into a mixed distribution signal of the frequency-converted output signals B1 and C1 and the reference satellite signal by the switching means, the signal obtained from the switching means is switched by the switching means. However, it is a mixed output of the reference satellite signal A and the frequency-converted output signal B1 or C1. Therefore, even if the frequencies of B1 and C1 partially overlap, these B1, C1
Is not output at the same time, so that even if transmission is made from the switching means to a television receiver or the like by means of a single coaxial cable, interference etc. does not occur and transmission is possible by means of a single coaxial cable. . Moreover, the reference satellite signal can always be received no matter how the switching means is switched.

Furthermore, according to the third aspect of the present invention, the frequency conversion is performed on three or more satellite signals having overlapping frequency bands, for example, satellite signals B and C other than the reference satellite signal A among A, B and C. Then, these frequency-converted output signals B1 and C
1 is distributed by each distribution means, the distribution output from each distribution means is switched by the switching means, and the output signal from this switching means is mixed with the reference satellite signal A by the mixer and output. Therefore, even if the frequencies of B1 and C1 partially overlap, B1 and C1 are not output at the same time. Therefore, the mixer transmits one coaxial cable to a television receiver or the like. However, interference or the like does not occur, and transmission can be performed with one coaxial cable. Moreover, the signal passing through the switching means is the satellite signal B.
Since only C1 and C1 are used, switching means having a narrow frequency band can be used.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of a simplified headend device according to the present invention.

FIG. 2 is a block diagram of the second embodiment.

FIG. 3 is a block diagram of the third embodiment.

FIG. 4 is a block diagram of a conventional simplified headend device.

FIG. 5 is a block diagram of a switching means used in the first embodiment.

[Explanation of symbols]

45, 46, 47 Input terminal 68 74 Block converter (frequency conversion means) 76 82 83 Distributor (mixing distribution means) 78 80 Mixer (mixing distribution means) 84 86 88 90 90 Changeover switch (switching means) 92 94 96 96 98 Output Terminal 112 114 116 116 118 Mixer (mixing means) 124 126 128 130 Changeover switch (changer)

Claims (6)

[Claims] 1. A plurality of input terminals to which a plurality of satellite signals overlapping in frequency bands are respectively input, a plurality of output terminals, and movable contacts connected to these output terminals, respectively. A simplified headend device comprising: a plurality of switching means having contacts, and a distribution means for distributing the satellite signals respectively supplied to the input terminals to corresponding fixed contacts of the switching means. 2. The simplified headend device according to claim 1, wherein at least one of the satellite signals is mixed with a broadcast signal having a frequency different from the satellite signal. . 3. A plurality of frequency conversions for converting respective satellite signals other than the reference satellite signal serving as a reference among three or more satellite signals having overlapping frequency bands into respective output frequencies different from the reference satellite signal. Means, mixing means for mixing the respective output signals of the frequency conversion means and the reference satellite signal, distribution means for distributing the mixed output of each mixing means to a plurality, and a plurality of switching means for switching the output signals of the respective distribution means. And a switching means of the simple head end device. 4. The simplified head-end device according to claim 3, wherein at least one wave of the satellite signals is mixed with a broadcast signal having a frequency different from the satellite signal. End device. 5. A plurality of frequency converters for converting each satellite signal other than the reference satellite signal serving as a reference among three or more satellite signals overlapping in the frequency band to an output frequency that is a different frequency from the reference satellite signal. Means, a distributing means for distributing the output signals of the frequency converting means, a plurality of switching means for respectively switching the respective distribution output signals of the distributing means, and an output signal of the respective switching means and the reference satellite signal. A simplified head-end device comprising a mixing means. 6. The simplified head-end device according to claim 5, wherein at least one wave of each satellite signal is mixed with a broadcast signal of a frequency different from that of each satellite signal. End device.