JPH08288764A - Terminal compensating amplifier - Google Patents

Abstract

PURPOSE: To switch the application mode of this terminal compensating amplifier. CONSTITUTION: An input signal mixing a CATV signal, a UHF signal and a BS(CS)-IF signal is branched by branching filters 1, 2 and respectively amplified by a CATV amplification part 3, a UHF amplification part 4 and a BS(CS)- IF amplification part 5. Respective amplified outputs are outputted from a 1st output terminal OUT1 or a 3rd output terminal OUT3 in accordance with the switching states of 1st and 2nd switches SW1, SW2 and a higher frequency band can reduce the passage of the switches.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal compensation amplifier for amplifying three signals output in three output modes and having different frequency bands.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a system in which a CATV (cable television) is installed in a TV receiving facility such as a building or an apartment. In this example system,
The downward CATV signal branched by the bidirectional branch amplifier 101 inserted in the CATV signal transmission line is tapped off (TAP OFF) 102 and the protector (S).
The signal is input to the first input terminal of the bidirectional amplifier 103 via B) and the UHF signal from the UHF antenna 105 is input to the second input terminal of the bidirectional amplifier 103. The BS-IF or CS-IF signal from the BS / CS antenna 104 is input to the third input terminal of the amplifier 103. The three types of signals input to the first input terminal to the third input terminal are input to the bidirectional amplifier 10 respectively.
It is amplified by 3 and mixed and output from one output terminal.

Of the output of the bidirectional amplifier 103, the signal branched in the branching device (DC) 110 is distributed to a plurality of parts by the distributor (D) 111, and the bidirectional amplifier 10
It is amplified by 9 and further distributed by a distributor (D) 112 into a plurality of parts. One distributed output that has been distributed is supplied to a plurality of serial units (SU) 113 connected in cascade. At the end of this series unit 113 is a terminating resistor 11
4 are connected. The series unit 113 is provided in each room in the house, etc., and a television receiver is connected to the series unit 113 via a terminal compensation amplifier described later. The downstream transmission band of the CATV signal is, for example, 70 to 450 MHz, the frequency band of the UHF signal is 470 to 770 MHz, and BS (C
S) The frequency band of the intermediate frequency (IF) of broadcasting is 1035
˜1550 MHz.

This terminal compensation amplifier will be described with reference to the in-home system example shown in FIG. The in-home system example illustrated in FIG. 5A is an in-home system example in which two TV receivers are provided, and C output from the serial unit (SU) 113 is used.
The mixed signal of the ATV signal, the UHF signal, and the BS (CS) -IF signal is divided into two by the distributor (D1) 120, and the respective distribution outputs are further distributed (D2) 1.
It is divided into three by 22 and input to the terminal compensation amplifier 121. The signals input to the terminal compensation amplifier 121 are CATV amplifier A, UHF amplifier B, BS (C
S) -IF amplifier C is input and amplified.

Among them, the CATV signal amplified by the CATV amplifier A is the home terminal (HT) 12
3 allows multi-channel CATV signals to be sent to the TV receiver 1
TV receiver 1 converted to a frequency that can be received by the TV 25
25. The UHF signal amplified by the UHF amplifier B is directly supplied to the TV receiver 125. Further, the BS (CS) -IF signal amplified by the BS (CS) -IF amplifier C has its receiving channel selected and demodulated in the BS (CS) tuner 124 and is supplied to the TV receiver 125. The distributor (D1)
Although the configuration in which the other output distributed by 120 is supplied is not shown, the illustrated distributor (D2)
The configuration after 122 is the same.

FIG. 5B shows another in-home system example having two TV receivers. In this in-home system example, the CATV signal and the UHF signal output from the serial unit (SU) 113 are shown. , And BS (CS) -IF
The mixed signal with the signal is divided into two by the divider (D) 120, and the respective divided outputs are further divided by the demultiplexer 128 into the CATV signal, the UHF signal and the BS (CS) -I.
The signal is demultiplexed into a mixed signal with the F signal, and the terminal compensation amplifier 12
7 is input. C input to the terminal compensation amplifier 127
The ATV signal is input to the CATV amplifier A and amplified,
The mixed signal of the UHF signal and the BS (CS) -IF signal is amplified in the amplifier D.

Of these signals, the CATV signal amplified by the CATV amplifier A is the home terminal (HT) 12
3 allows multi-channel CATV signals to be sent to the TV receiver 1
TV receiver 125 converted to a frequency that can be received by the
Is supplied to. Further, the signal amplified by the amplifier D is demultiplexed into a UHF signal and a BS (CS) -IF signal by the demultiplexer 126, and the demultiplexed UHF signal is directly transmitted to the T
It is supplied to the V receiver 125 and further BS (CS) -I
A reception channel of the F signal is selected and demodulated in the BS (CS) tuner 124 and is input to the TV receiver 125. Although the configuration in which the other output distributed by the distributor (D) 120 is supplied is not illustrated, it is the same as the configuration of the duplexer 128 and subsequent components illustrated.

[0008]

The terminal compensation amplifier system has a plurality of types of usage as shown by amplifiers A to D as shown in FIG. 5, and an amplifier of each mode is required. There was a problem that the number of types of compensation amplifiers increased. Furthermore, in the in-home system shown in FIG. 5, the number of cables and the number of connections for constructing the in-home system are large, and the in-home system is complicated because a branching filter and a distributor are required. There was a problem that it would be complicated.

Therefore, according to the present invention, 1
An object of the present invention is to provide a terminal compensation amplifier that can be made into various types and can simplify the construction of a home system.

[0010]

In order to solve the above-mentioned problems, the terminal compensation amplifier of the present invention comprises a first frequency band of a first frequency band.
A first amplification unit for amplifying a signal, a second amplification unit for amplifying a second signal in a second frequency band higher than the first frequency band, and a third frequency higher than the second frequency band. A third amplifier for amplifying the third signal in the band, and a component for demultiplexing the signal input from the input terminal and inputting it to the corresponding first amplifier, second amplifier, and third amplifier, respectively. The wave means and three of the first output terminal, the second output terminal, and the third output terminal
And a selection / coupling means inserted between the three output terminals and the first amplification section, the second amplification section, and the third amplification section. The amplified first signal, the second signal, and the third signal, which are respectively output from the second amplification unit and the third amplification unit, are singly or mixed by the selection / combining means and the first output terminal. , The second output terminal, and the third output terminal.

In the terminal compensation amplifier, the selecting / combining means outputs a first signal, a second signal and a third signal to each of the three output terminals, a first output mode, and a third output mode. Mixing one signal and the second signal,
A second output mode in which the third signal is output to the second output terminal and the third signal is output to the third output terminal;
Mixing the signal, the second signal, and the third signal,
A third output mode for outputting to the third output terminal is provided, and the first signal is CA
This is a TV signal, and the first amplification section is a bidirectional amplification section.

[0012]

According to the present invention, the selecting / combining means outputs the first signal, the second signal and the third signal to each of the three output terminals, and mixes the first signal and the second signal. , The second signal can be output to the second output terminal, the third signal can be output to the third output terminal, and the first signal, the second signal, and the third signal can be mixed and output to the third output terminal. Even if the usage mode is different, one terminal compensation amplifier can be used. Moreover, since the input signal can be a mixed signal in which the first signal, the second signal, and the third signal are mixed even if the usage mode is different, the number of cables and the in-home system can be simplified. The connection work can be simplified.

[0013]

1 is a block diagram showing the configuration of an embodiment of a terminal compensation amplifier of the present invention. In the terminal compensation amplifier 10 shown in this figure, the CAs mixedly input to the input terminal IN are input.
The TV signal, the UHF signal, and the BS (CS) -IF signal are transmitted to the CATV by the demultiplexer 1 via the capacitor C1.
Signal and mixed signal of UHF signal and BS (CS) -I
CAT demultiplexed into F signal and demultiplexed by demultiplexer 1
The mixed signal of the V signal and the UHF signal is demultiplexed by the demultiplexer 2 into a CATV signal and a UHF signal. The CATV signal demultiplexed by the demultiplexer 2 is supplied to and amplified by the CATV amplification unit 3, and the demultiplexed UHF signal is supplied and amplified by the UHF amplification unit 4 and demultiplexed by the demultiplexer 1. The BS (CS) -IF signal is sent to the BS (CS) -IF amplifier 5
Is supplied to and amplified.

The CATV amplification unit 3 includes an attenuator (ATT) for level adjustment, an equalizer (EQ) for frequency characteristic adjustment, an amplifier (AMP), and a gain control (G).
C), amplifier (AMP), UHF
The amplification unit 4 and the BS (CS) -IF amplification unit 5 include an attenuator (ATT) for level adjustment, an amplifier (AMP),
It is composed of a gain control (GC) and an amplifier (AMP).

CAT amplified by the CATV amplification unit 3
The V signal is input to the first switch SW1, and the capacitor C
Output to the first output terminal (OUT1) via
Alternatively, it is supplied to the multiplexer 6. In addition, the UHF amplifier 4
The signal amplified by is input to the second switch SW2 via the multiplexer 6, and is output to the second output terminal (OUT2) via the capacitor C3 or is supplied to the multiplexer 7. Further, the BS (CS) -IF signal amplified by the BS (CS) -IF amplification unit 5 is output from the third output terminal (OUT3) via the multiplexer 7 and the capacitor C4.

Although the terminal compensator 10 operates at AC100V, the CATV amplification is performed from the third output terminal OUT3 via the choke coil CH and the third switch SW3 so that the terminal compensator 10 can also be operated by a power source with a built-in BS (CS) tuner. The operating voltage can be supplied to the unit 3, the UHF amplifying unit 4, and the BS (CS) -IF amplifying unit 5.

The terminal compensation amplifier 10 having the above structure
Will be described below for various home systems shown in FIG. The home system shown in FIG. 2A is a case where the terminal compensation amplifier 10 has one input and one output, and the CATV signal, the UHF signal, and the CATV signal output from the series unit SU,
The signal obtained by mixing the BS (CS) -IF signal and the BS (CS) -IF signal is amplified by the terminal compensation amplifier 10 and divided by the distributor 11 into 2
To be distributed. Then, the distributed signal is further distributed to the distributor 1.
It is demultiplexed by 2. Of the demultiplexed CATV signals, the multi-channel CATV signals are frequency-converted by the home terminal (HT) 13 and supplied to the TV receiver 15. In addition, the UHF signal of the three distributions is
It is directly supplied to the TV receiver 15. Furthermore, the BS (CS) -IF signal of the three distributions is the BS (CS)
A desired reception channel is selected and demodulated by being input to the tuner 14, and is supplied to the TV receiver 15.

When the terminal compensating amplifier 10 shown in FIG. 1 is used as the terminal compensating amplifier of the home system thus constructed, the first switch S in the terminal compensating amplifier 10 is used.
W1 and the second switch SW2 are switched to the side shown in FIG. Then, the CATV signal amplified by the CATV amplifying unit 3 is input to the first switch SW1, passes through the path of the movable contact C1-fixed contact A1-fixed contact A2-movable contact C2, and is connected to one of the multiplexers 6. It is supplied to the input terminal.

Further, U amplified by the UHF amplifier 4
The HF signal is input to the other input terminal of the multiplexer 6,
The CATV signal input to one of the input terminals is mixed and output. This mixed signal is the second switch SW2.
Is input to one input terminal of the multiplexer 7 through the path of the movable contact C3-fixed contact A3-fixed contact A4-movable contact C4. Further, the BS (CS) -IF signal amplified by the BS (CS) -IF amplifying unit 5 is input to the other input terminal of the multiplexer 7 and the CATV signal input to one input terminal. It is further mixed with the mixed signal with the UHF signal and output from the third output terminal (OUT3) via the capacitor C4. In this way, the home system shown in FIG. 2A can be realized.
The resistors R1 and R2 respectively connected to the first switch SW1 and the second switch SW2 are termination resistors.

Next, the home system shown in FIG. 2 (b) is a case where the terminal compensation amplifier 10 has one input and two outputs.
CATV signal output from the serial unit SU, UHF
The signal obtained by mixing the signal and the BS (CS) -IF signal is divided into two by the divider 11. The distributed signal is input to the terminal compensation amplifier 10 and amplified, and the output signal is output from the two output terminals. A mixed signal of the CATV signal and the UHF signal is output from the one output terminal (OUT2), the mixed signal is demultiplexed by the demultiplexer 16, and the demultiplexed CATV signal is output to the home terminal (HT). ) 13, the multi-channel CATV signals are frequency-converted and supplied to the TV receiver 15. Further, the demultiplexed UHF signal is directly used for the TV receiver 15
Is supplied to.

Further, the BS (CS) -IF signal output from the other output terminal (OUT3) is input to the BS (CS) tuner 14, and the selected / demodulated signal is supplied to the TV receiver 15. When the terminal compensation amplifier 10 shown in FIG. 1 is used as the terminal compensation amplifier 10 of the home system thus configured, the first switch SW1 in the terminal compensation amplifier 10 is switched to the side shown in FIG. The switch SW2 is switched to the side opposite to the side shown in FIG.
Then, the CATV signal amplified by the CATV amplifier 3 is input to the first switch SW1 and its movable contact C
It is supplied to one input terminal of the multiplexer 6 through a path of 1-fixed contact A1-fixed contact A2-movable contact C2.

Further, U amplified by the UHF amplifier 4
The HF signal is input to the other input terminal of the multiplexer 6,
The CATV signal input to one of the input terminals is mixed and output. This mixed signal is the second switch SW2.
And a mixed signal of the CATV signal and the UHF signal is output from the second output terminal (OUT2) through the path of the movable contact C3-fixed contact B3 and the capacitor C3. Further, the BS (CS) -IF signal amplified by the BS (CS) -IF amplification unit 5 is output from the third output terminal (OUT3) via the multiplexer 7 and the capacitor C4. As a result, the in-home system shown in FIG. 2B can be realized.

Next, the home system shown in FIG. 2 (c) is a case where the terminal compensation amplifier 10 has one input and three outputs.
CATV signal output from the serial unit SU, UHF
The signal obtained by mixing the signal and the BS (CS) -IF signal is divided into two by the divider 11. The distributed signal is input to the terminal compensation amplifier 10 and amplified, and the output signal is output from the three output terminals.

From the one output terminal (OUT1), C
The ATV signal is output, and the output CATV signal is a multi-channel C signal from the home terminal (HT) 13.
The ATV signal is frequency-converted and supplied to the TV receiver 15. In addition, U from another one output terminal (OUT2)
The HF signal is output, and this UHF signal is used as it is on the TV.
It is supplied to the image receiver 15. Further, the BS (CS) -IF signal output from the other remaining output terminal (OUT3) is input to the BS (CS) tuner 14, and the selected / demodulated signal is supplied to the TV receiver 15.

The terminal compensation amplifier 10 shown in FIG. 1 is used as the terminal compensation amplifier 10 of the in-home system configured as described above.
1 is used, the first switch SW1 and the second switch SW2 in the terminal compensation amplifier 10 are switched to the side opposite to the side shown in FIG. Then, the CATV signal amplified by the CATV amplification unit 3 is input to the first switch SW1, is output through the path of the movable contact C1 to the fixed contact B1, and is further output via the capacitor C2 to the first output terminal (OUT1). ).

U amplified by the UHF amplifier 4
The HF signal is input to the second switch SW2 via the multiplexer 6, output through the path of the movable contact C3-fixed contact B3 thereof, and further output from the second output terminal (OUT2) via the capacitor C3. To be done. In addition, BS (CS)
The BS (CS) -IF signal amplified by the −IF amplifier 5 is output from the third output terminal (OUT3) via the multiplexer 7 and the capacitor C4. Thus, FIG.
The home system shown in (c) can be realized.

Further, the terminal compensation amplifier 10 of the present invention is
It can also be used as the amplifiers A and D of the home system shown in FIG. In this case, the first switch SW1
Is switched to the side opposite to that shown in FIG. 1, and the second switch SW2 is switched to the side shown. Then, the CAT amplified by the CATV amplification unit 3
The V signal is input to the first switch SW1, is output via the path of the movable contact C1 to the fixed contact B1, and is further output from the first output terminal (OUT1) via the capacitor C2.

Further, U amplified by the UHF amplifier 4
The HF signal is input to the second switch SW2 via the multiplexer 6, and the movable contact C3-fixed contact A3-fixed contact A thereof.
4-The signal is input to one input terminal of the multiplexer 7 through the path of the movable contact C4. Further, the BS (CS) -IF signal amplified by the BS (CS) -IF amplifying unit 5 is input to the other input terminal of the multiplexer 7 and the UHF signal input to one input terminal. Mixed, capacitor C4
Is output from the third output terminal (OUT3). In this way, the in-home system shown in FIG. 5B can be realized.

The terminal compensation amplifier of the present invention has one input terminal and one output terminal or three output terminals depending on the mode of use, as described above, so that at most four terminals are provided. The wiring work around the terminal compensation amplifier can be performed simply by connecting the cable. Furthermore, if the terminal compensation amplifier of the present invention is used in a home system, other necessary distributors, demultiplexers, etc. can be omitted, and the home system can be simplified.

Next, a modification of the terminal compensation amplifier of the present invention is shown in FIG. In this modification, the terminal compensation amplifier is operated as a bidirectional amplifier. However, only CATV is required to have bidirectionality. Therefore, the bidirectional CATV amplifier 3 is used. Only the configuration is shown in FIG. As shown in this figure, the bidirectional CATV amplification unit 3 includes a downstream amplification unit 3-1, an upstream amplification unit 3-2, and demultiplexing multiplexers 3-3 and 3-4. The downstream CATV signal input through the demultiplexer 2 is guided to the downstream amplification section 3-1 by the demultiplexer-multiplexer 3-3, the level adjusting attenuator (ATT) and the frequency characteristic adjusting equalizer (E).
Q), amplifier (AMP), gain control (G
C), amplified to a predetermined level by an amplifier (AMP), and passed through the demultiplexer-multiplexer 3-4 to the first switch SW.
It is output to 1.

The upstream CATV signal input from the first switch SW1 is guided to the upstream amplification section 3-2 by the demultiplexer-multiplexer 3-4, and the level adjusting attenuator (AT).
T), amplifier (AMP), gain control (G
C) is amplified to a predetermined level by the amplifier (AMP) and is output to the demultiplexer 2 through the demultiplexer-multiplexer 3-3. The frequency band of the downstream CATV signal is, for example, 70 to 450 MHz, and the frequency band of the upstream CATV signal is, for example, 10 to 50 MHz. In this way, by making the CATV amplification unit 3 bidirectional, a command or the like can be transmitted from the user side, and video-on-demand or the like can be performed.

[0032]

Since the present invention is configured as described above, the selection / combining means outputs the first signal, the second signal, and the third signal to each of the three output terminals.
The signal and the second signal are mixed and output to the second output terminal,
Since the third signal can be output to the third output terminal, the first signal, the second signal, and the third signal can be mixed and output to the third output terminal, etc., 1 A single terminal compensation amplifier can support various home systems. Further, since the input signal can be a mixed signal in which the first signal, the second signal, and the third signal are mixed even if the usage mode is different, the distributor and the demultiplexer can be omitted. The number of cables and home system can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a terminal compensation amplifier of the present invention.

FIG. 2 is a diagram showing a plurality of block diagrams of a home system to which the terminal compensation amplifier of the present invention is applied.

FIG. 3 is a diagram showing a modification of the terminal compensation amplifier of the present invention.

FIG. 4 is a diagram showing an example of a TV co-listening system in which CATV is introduced.

FIG. 5 is a diagram showing a block diagram of a home system in a TV co-listening system in which CATV is introduced.

[Explanation of symbols]

 1, 2 demultiplexer 3 CATV amplification section 4 UHF amplification section 5 BS (CS) -IF amplification section 6, 7 Multiplexer 8 Stabilized power supply 10 Terminal compensation amplifier SW1, SW2, SW3 switch

Claims (3)

[Claims] 1. A first amplification unit that amplifies a first signal in a first frequency band, a second amplification unit that amplifies a second signal in a second frequency band higher than the first frequency band, and A third amplification unit that amplifies a third signal in a third frequency band higher than the two frequency bands, and the first amplification unit and the second amplification unit that respectively demultiplex the signal input from the input terminal An amplifying unit, a demultiplexing unit for inputting to the third amplifying unit, three output terminals of a first output terminal, a second output terminal, and a third output terminal, the three output terminals, and the first amplifying unit, A selection / coupling unit inserted between the second amplification unit and the third amplification unit is provided, and the amplified output signals respectively output from the first amplification unit, the second amplification unit, and the third amplification unit. First signal, the second
A terminal compensation amplifier, wherein the signal and the third signal are output to the first output terminal, the second output terminal, and the third output terminal individually or in a mixture by the selecting / combining means. 2. The selecting / combining means outputs a first signal, a second signal, and a third signal to each of the three output terminals, a first output mode, the first signal and the second signal. And a second output mode in which the third signal is output to the second output terminal and the third signal is output to the third output terminal, and the first signal, the second signal, and the third signal. 2. The terminal compensation amplifier according to claim 1, wherein the terminal compensation amplifier has a third output mode in which is mixed with and output to the third output terminal. 3. The first signal is a CATV signal,
The terminal compensation amplifier according to claim 1 or 2, wherein the first amplification section is a bidirectional amplification section.