JP2899229B2 - Terminal compensation amplifier - Google Patents

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 from 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 introduced into 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 supplied to the tap-off (TAP OFF) 102 and the protector (S).
B), the signal is input to the first input terminal of the bidirectional amplifier 103, and the UHF signal from the UHF antenna 105 is input to the second input terminal of the bidirectional amplifier 103. Further, a BS-IF or CS-IF signal from the BS / CS antenna 104 is input to a third input terminal of the amplifier 103. The three types of signals input to the first to third input terminals are respectively input to the bidirectional amplifier 10.
3 and are mixed and output from one output terminal.

[0003] Of the output of the bidirectional amplifier 103, the signal branched at the branching device (DC) 110 is distributed to a plurality of components by the distributor (D) 111, and the bidirectional amplifier 10
9 and further distributed to a plurality by a distributor (D) 112. One distributed output is supplied to a plurality of serially connected serial units (SU) 113. The terminating resistor 11 is connected to the end of the series unit 113.
4 are connected. The serial unit 113 is provided in each room or the like in the house, and a television receiver is connected to the serial unit 113 via a terminal compensation amplifier described later. The downlink 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 the BS (C
S) Broadcasting intermediate frequency (IF) frequency band is 1035
〜1550 MHz.

This terminal compensation amplifier will be described with reference to an example of a home system shown in FIG. The example of the in-home system shown in FIG. 5A is an example of an in-home system having two TV receivers, and the C output from the serial unit (SU) 113.
A mixed signal of the ATV signal, the UHF signal, and the BS (CS) -IF signal is divided into two by a divider (D1) 120, and each divided output is further divided by a divider (D2) 1
The signal is divided into three signals 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)-The signal is input to the IF amplifier C and amplified.

The CATV signal amplified by the CATV amplifier A is a home terminal (HT) 12
3, the multi-channel CATV signal is transmitted to the TV receiver 1
25 is converted to a frequency that can be received by the TV receiver 1
25. The UHF signal amplified by the UHF amplifier B is supplied to the TV receiver 125 as it is. Further, the BS (CS) -IF signal amplified by the BS (CS) -IF amplifier C has its receiving channel selected and demodulated by 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 H.120 is supplied is not illustrated, the illustrated distributor (D2)
The configuration is the same as the configuration after 122.

FIG. 5B shows another example of a home system having two TV receivers. In this home system example, a CATV signal and a UHF signal output from a serial unit (SU) 113 are shown. , And BS (CS) -IF
The mixed signal with the signal is split into two by a splitter (D) 120, and each split output is further split by a splitter 128 into a CATV signal, a UHF signal and a BS (CS) -I
The signal is demultiplexed into a mixed signal with the F signal, so that the
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.

The CATV signal amplified by the CATV amplifier A is a home terminal (HT) 12
3, the multi-channel CATV signal is transmitted to the TV receiver 1
25 is converted to a frequency that can be received by the TV receiver 125.
Supplied to The signal amplified by the amplifier D is split by the splitter 126 into a UHF signal and a BS (CS) -IF signal.
Supplied to the V receiver 125 and further transmitted to the BS (CS) -I
The reception channel of the F signal is selected and demodulated in a BS (CS) tuner 124 and input to a TV receiver 125. Although the configuration to which the other output distributed by the distributor (D) 120 is supplied is not shown, it is the same as the configuration after the duplexer 128 shown.

[0008]

As shown in FIG. 5, the terminal compensating amplifier system has a plurality of types of usage as shown as amplifiers A to D, and each type of amplifier is required. There is a problem that the number of types of compensation amplifiers increases. Further, 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 duplexer and a distributor are required. There was a problem that it became complicated.

Therefore, the present invention provides a method of using the present invention even if the mode of use is different.
It is an object of the present invention to provide a terminal compensation amplifier that can be of any type and that can simplify the construction of a home system.

[0010]

In order to solve the above-mentioned problems, a terminal compensation amplifier according to the present invention comprises a first compensating amplifier of a first frequency band.
A first amplifier for amplifying a signal, a second amplifier 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 amplifying unit for amplifying a third signal in a band, and a component for demultiplexing a signal input from an input terminal and inputting the demultiplexed signal to the corresponding first, second and third amplifying units, respectively. Wave means, and three of the first output terminal, the second output terminal, and the third output terminal.
Three output terminals, the three output terminals, and selection / coupling means inserted between the first amplifying unit, the second amplifying unit, and the third amplifying unit. Amplifying the first signal, the second signal, and the third signal respectively output from the second amplifying unit and the third amplifying unit by the selection / combining means, alone or in combination with the first output terminal , The second output terminal and the third output terminal.

In the terminal compensation amplifier, the selection / coupling means includes a first output mode for outputting the first signal, the second signal, and the third signal to each of the three output terminals; Mixing the first signal and the second signal,
A second output mode for outputting to the second output terminal and outputting the third signal to the third output terminal;
Mixing the signal, the second signal, and the third signal,
A third output mode for outputting the signal to the third output terminal;
The first amplifying section is a TV signal, and the first amplifying section is a bidirectional amplifying section.

[0012]

According to the present invention, the first signal, the second signal, and the third signal are output to the three output terminals by the selection / coupling means, and the first signal and the second signal are mixed. Output to the second output terminal, output the third signal to the third output terminal, and mix the first signal, the second signal, and the third signal and output the mixed signal to the third output terminal. Even if the usage mode is different, it can be handled by one terminal compensation amplifier. Further, even if the use mode is different, the input signal can be a mixed signal in which the first signal, the second signal, and the third signal are mixed, so that the number of cables and the home system can be simplified, and Connection work can be simplified.

[0013]

FIG. 1 is a block diagram showing the configuration of an embodiment of a terminal compensation amplifier according to the present invention. In the terminal compensation amplifier 10 shown in FIG.
The TV signal, the UHF signal, and the BS (CS) -IF signal are output from the CATV by the duplexer 1 via the capacitor C1.
Mixed signal of the UHF signal and the UHF signal, and BS (CS) -I
CAT split into F signal and split by splitter 1
The mixed signal of the V signal and the UHF signal is split by the splitter 2 into a CATV signal and a UHF signal. The CATV signal demultiplexed by the demultiplexer 2 is supplied to a CATV amplification unit 3 and amplified, and the demultiplexed UHF signal is supplied to a UHF amplification unit 4 and amplified, and demultiplexed in the demultiplexer 1. The BS (CS) -IF signal is supplied to the BS (CS) -IF amplifier 5
And amplified.

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

CAT amplified by the CATV amplifier 3
The V signal is input to the first switch SW1 and the capacitor C
2 to the first output terminal (OUT1)
Alternatively, it is supplied to the multiplexer 6. Also, the UHF amplifier 4
Is input to the second switch SW2 via the multiplexer 6 and 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 amplifier 5 is output from the third output terminal (OUT3) via the multiplexer 7 and the capacitor C4.

Although the terminal compensator 10 operates at 100 VAC, it also operates with a power supply having a built-in BS (CS) tuner, and a CATV amplifier via a choke coil CH and a third switch SW3 from a third output terminal OUT3. An operating voltage can be supplied to the section 3, the UHF amplifying section 4, and the BS (CS) -IF amplifying section 5.

The terminal compensation amplifier 10 constructed as described above
Will be described below for use in various home systems shown in FIG. In the home system shown in FIG. 2A, the terminal compensation amplifier 10 has one input and one output, and the CATV signal, the UHF signal output from the serial unit SU,
And a signal in which the BS (CS) -IF signal is mixed is amplified by the terminal compensation amplifier 10 and is divided by the divider 11 into two.
Be distributed. Then, the divided signal is further divided by the divider 1
2 is demultiplexed. The CATV signal that has been demultiplexed is subjected to frequency conversion of a multi-channel CATV signal by a home terminal (HT) 13 and supplied to a TV receiver 15. Also, the UHF signal of the three distributions is
It is supplied to the TV receiver 15 as it is. Further, the BS (CS) -IF signal among the three distributions is the BS (CS)
The signal is input to the tuner 14, a desired reception channel is selected and demodulated, and supplied to the TV receiver 15.

When the terminal compensation amplifier 10 shown in FIG. 1 is used as the terminal compensation amplifier of the home system thus configured, the first switch S in the terminal compensation 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 amplification unit 3 is input to the first switch SW1, and passes through the path of the movable contact C1, the fixed contact A1, the fixed contact A2, and the movable contact C2 to one of the multiplexers 6. It is supplied to the input terminal.

The UHF amplifier 4 amplifies the U
The HF signal is input to the other input terminal of the multiplexer 6,
The signal is mixed with the CATV signal input to one input terminal and output. This mixed signal is supplied to the second switch SW2
To the other 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 is combined with the CATV signal input to one input terminal. The signal is further mixed with the mixed signal with the UHF signal and output from the third output terminal (OUT3) via the capacitor C4. Thus, the home system shown in FIG. 2A can be realized.
The resistors R1 and R2 connected to the first switch SW1 and the second switch SW2 are terminating resistors.

Next, in the home system shown in FIG. 2B, the terminal compensation amplifier 10 has one input and two outputs.
CATV signal output from serial unit SU, UHF
The signal and a signal obtained by mixing the BS (CS) -IF signal are split into two by the splitter 11. The distributed signal is input to the terminal compensation amplifier 10 and amplified, but the output signal is output from two output terminals. A mixed signal of the CATV signal and the UHF signal is output from the one output terminal (OUT2), and the mixed signal is split by the splitter 16, and the split CATV signal is sent to the home terminal (HT). ) 13 converts the frequency of the multi-channel CATV signal and supplies it to the TV receiver 15. Further, the separated UHF signal is used as it is in the TV receiver 15.
Supplied to

Further, a BS (CS) -IF signal output from another output terminal (OUT3) is input to a BS (CS) tuner 14, and a selected / demodulated signal is supplied to a 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 the movable contact C
The signal is supplied to one input terminal of the multiplexer 6 through a path of 1-fixed contact A1-fixed contact A2-movable contact C2.

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

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

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

As the terminal compensation amplifier 10 of the home system thus configured, the terminal compensation amplifier 10 shown in FIG.
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 amplifier 3 is input to the first switch SW1, output through the path of the movable contact C1 to the fixed contact B1, and further output to the first output terminal (OUT1) via the capacitor C2. ) Is output.

The UHF amplifier 4 amplifies the U
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, and further output from the second output terminal (OUT2) via the capacitor C3. Is done. Furthermore, BS (CS)
The BS (CS) -IF signal amplified by the IF amplifying unit 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.

Furthermore, the terminal compensation amplifier 10 of the present invention
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 in FIG. Then, the CAT amplified by the CATV amplifier 3
The V signal is input to the first switch SW1, output through the path from the movable contact C1 to the fixed contact B1, and output from the first output terminal (OUT1) via the capacitor C2.

The UHF amplified by the UHF amplifier 4
The HF signal is input to the second switch SW2 via the multiplexer 6, and its movable contact C3-fixed contact A3-fixed contact A
4- It 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 section 5 is input to the other input terminal of the multiplexer 7, and the UHF signal input to one input terminal is combined with the UHF signal. Mixed with capacitor C4
Via the third output terminal (OUT3). In this way, the home system shown in FIG. 5B can be realized.

As described above, the terminal compensation amplifier of the present invention has one input terminal and one or three output terminals depending on the mode of use, so that at most four terminals are provided. The wiring work around the terminal compensation amplifier can be performed only by connecting the cable. Further, when the terminal compensation amplifier of the present invention is used in a home system, other necessary distributors and demultiplexers 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, since bidirectionality is required only for the CATV, the bidirectional CATV amplification unit 3 Only the configuration is shown in FIG. As shown in this figure, the bidirectional CATV amplifier 3 includes a downstream amplifier 3-1 and an upstream amplifier 3-2, and demultiplexers / multiplexers 3-3 and 3-4. The downstream CATV signal input via the multiplexer 2 is guided to the downstream amplifier 3-1 by the demultiplexer / demultiplexer 3-3, and an attenuator (ATT) for level adjustment and an equalizer (E) for frequency characteristic adjustment.
Q), amplifier (AMP), gain control (G
C), the signal is amplified to a predetermined level by an amplifier (AMP), and is supplied to a first switch SW via a demultiplexer / multiplexer 3-4.
1 is output.

The upstream CATV signal input from the first switch SW1 is guided to the upstream amplifier 3-2 by the demultiplexer / demultiplexer 3-4, and the level is adjusted by an attenuator (AT).
T), amplifier (AMP), gain control (G
C), is amplified to a predetermined level by an amplifier (AMP), and output to the duplexer 2 via the duplexer 3-3. The frequency band of the downlink CATV signal is, for example, 70 to 450 MHz, and the frequency band of the uplink CATV signal is, for example, 10 to 50 MHz. As described above, by making the CATV amplifier 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 constructed as described above, the first / second / third signal is output to each of the three output terminals by the selection / coupling means.
Mixing the signal and the second signal and outputting 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. One terminal compensation amplifier can support various home systems. Further, even if the use mode is different, the input signal can be a mixed signal in which the first signal, the second signal, and the third signal are mixed, and the distributor and the duplexer can be omitted. The number of cables and the home system can be simplified.

[Brief description of the 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 amplifying unit 4 UHF amplifying unit 5 BS (CS) -IF amplifying unit 6, 7 multiplexer 8 stabilized power supply 10 terminal compensation amplifier SW1, SW2, SW3 switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 1/16-1/30 H04N 5/00 H04N 7/00 H03F 3/68

Claims (3)

(57) [Claims] A first amplifier that amplifies a first signal of a first frequency band; a second amplifier that amplifies a second signal of a second frequency band higher than the first frequency band; A third amplifying unit for amplifying a third signal in a third frequency band higher than the two frequency bands; a first amplifying unit and a second amplifying unit for demultiplexing a signal input from an input terminal; Amplifying unit, demultiplexing means 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; A selecting / combining unit inserted between the second amplifying unit and the third amplifying unit, wherein the amplified signals output from the first amplifying unit, the second amplifying unit, and the third amplifying unit, respectively, are provided. The first signal, the second signal
A terminal compensation amplifier, wherein a signal and the third signal are output to the first output terminal, the second output terminal, and the third output terminal singly or mixed by the selection / combining means. 2. The first output mode for outputting the first signal, the second signal, and the third signal to each of the three output terminals, the first signal and the second signal. And a second output mode for outputting the third signal to the third output terminal while outputting the third signal 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, further comprising a third output mode in which the third output mode is mixed and output to the third output terminal. 3. The method according to claim 2, wherein the first signal is a CATV signal,
3. The terminal compensation amplifier according to claim 1, wherein the first amplifier is a bidirectional amplifier.