JP2001346184A - Community reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a community reception device where wrong operations of changeover switches electrically connected to terminals can be prevented and a connector can be easily attached. SOLUTION: This invention provides a television community reception amplifier used for a 2-way CATV system where a changeover switch group 12 to select a filter blocking a confluent noise connected to output terminals 10, 11 is arranged in the vicinity of poles of the output terminals 10, 11, and the output terminals 10, 11 are arranged to be plural rows so that the height of the terminals of the front row is designed lower than the height of the back rows.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier for television joint reception used in a bidirectional CATV system.

[0002]

2. Description of the Related Art In a joint receiving apparatus in which the output of a CATV signal is distributed to a plurality of terminals, terminals and a changeover switch electrically connected to the terminals are concentrated in another place.

[0003]

In the above-mentioned joint receiving apparatus, a filter for blocking a bidirectional upstream signal provided at a position of a plurality of terminals and at a terminal not transmitting bidirectionally to reduce inflow noise. It is conceivable that the positions of the plurality of changeover switches for selecting the are concentrated at different positions. Therefore, when operating the plurality of changeover switches, it is necessary to confirm a terminal for confirming a corresponding terminal. The present invention has been made to solve such a problem, and an object of the present invention is to provide a shared receiving device capable of reliably performing a switch switching operation without confirming the relationship between the plurality of changeover switches and a plurality of corresponding terminals. .

[0004]

According to the present invention, a switch electrically connected to a plurality of output terminals is disposed in the vicinity of a plurality of output terminals.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a configuration diagram illustrating a configuration of a CATV bidirectional amplifier according to an embodiment. FIG. 6 shows a bidirectional CAT
It is a block diagram showing the structure of a V system. In FIG.
1 is a house, which includes an apartment house and an individual house (detached house).
2 is a drop-in line from the CATV system, 3 is a CS antenna for receiving a CS signal, 3a is a CS converter for converting a CS received signal to an IF band, 4 is a BS antenna for receiving a BS signal, and 4a is a BS antenna for receiving a BS signal. Is a BS converter, and 5 is an amplifier, which is a bidirectional amplifier. 6 is B
A tuner that receives the S / CS signal and outputs a video / audio signal, a TV receiver 56 for outputting the video / audio output from the tuner, a cable modem 57,
Is an information terminal device, 59 is a set-top box (hereinafter, referred to as
STB). Reference numeral 7 inputs a first signal frequency (including VHF and UHF, for example, 69 MHz to 770 MHz; hereinafter, referred to as a bidirectional downstream signal) from the CATV service line 2 and a fourth signal frequency (for example, 5 MHz to 5 MHz). 58 MHz, hereinafter referred to as a bidirectional upstream signal). Reference numeral 8 denotes a third signal frequency output from the CS converter 3a (output signal of the satellite communication receiving converter 3a, for example, 1527 MHz to 2150 MHz).
z. An input terminal 9 for inputting a CS-IF signal is a second signal frequency (an output signal of the satellite broadcast receiving converter 4a, for example, 1035 MHz to 1335 MHz) output from the BS converter 4a. BS-IF signal). Incidentally, there is a possibility that the output signal of the mixer 55 is connected instead of the CATV drop-in line 2. Mixer 55
Have a VHF receiving antenna 53 and a UHF receiving antenna 5
4 are connected to each other. Reference numeral 10 denotes a first output terminal of the amplifier 5, which can select either bidirectional or unidirectional by operating an upstream signal blocking changeover switch 12, which will be described later, provided with the television common receiving amplifier. Reference numeral 11 denotes a second output terminal of the amplifier 5, which outputs only a downstream signal.

Next, the configuration of the joint receiving device will be described with reference to FIG.
This will be described in detail as shown in FIG. The amplifier 5 has an input terminal 7 for inputting a bidirectional downstream signal, an input terminal 8 for inputting a CS-IF signal, an input terminal 9 for inputting a BS-IF signal, and one or more bidirectional terminals. A bidirectional output terminal 10 capable of switching unidirectional, a unidirectional output terminal 11, and a plug 39 for inputting power are provided. Also, the input terminal 7, the input terminal 8, the input terminal 9, the bidirectional output terminal 1
A lightning arrester is attached to each of the 0 and unidirectional output terminals 11. In FIG. 1, when a user transmits data for reservation of viewing of a pay program or television shopping to an external interactive CATV system center device, the data is generated by an information terminal device such as a personal computer. Is converted by a cable modem 57 into a bidirectional upstream signal that can be transmitted by an external bidirectional CATV system and transmitted. The bidirectional upstream signal is transmitted to a bidirectional output terminal 10 of an amplifier 5 through a coaxial cable. You. Similarly, by operating the operation button of the STB 59, the above-described bidirectional up signal is input to the bidirectional output terminal 10. The bidirectional upstream signal input to the bidirectional output terminal 10 is supplied to a power signal separation filter 41b described later.
And is taken into the amplifier 5. The bidirectional upstream signal input to the power signal separation filter 41 is input to a bidirectional upstream signal blocking switch 12 and a distribution / mixing circuit 27 as a mixing circuit, which will be described later. The upstream signal mixed with the two-way upstream signal of the other two-way output terminal 10 blocks the two-way downstream signal, the BS-IF signal, and the CS-IF signal, and passes the two-way upstream signal through the filter 18 (for example, low-pass). The filter is limited to a predetermined bandwidth by a band switching circuit 17, which will be described later, and is amplified or attenuated to a predetermined level by a gain adjustment circuit 16, an amplification circuit 15, and an attenuation circuit 14 to block a bidirectional downstream signal. And a CATV input terminal 7 through a filter 13 that passes a bidirectional upstream signal.
Transmitted to The data is transmitted to the CATV center device via a cable connected to the CATV input terminal 7 and processed by the center device.

Next, the bidirectional downstream signal transmitted by the CATV service line 2 is input to the input terminal 7 of the amplifier 5. The bidirectional downstream signal input to the input terminal 7 is input to a filter 19 (for example, a high-pass filter; hereinafter, referred to as an HPF) that blocks the bidirectional upstream signal and passes only the bidirectional downstream signal, and is taken into the amplifier 5. . The bidirectional downstream signal input to the filter 19 is a filter 20 (for example, LP) for removing an 800 MHz band interference wave.
F), attenuation circuit 21, gain adjustment circuit 22, amplification circuit 2
3. The signal is amplified to a predetermined level by the tilt circuit 24 and the amplifier circuit 23, and the CATV upstream signal passes through the BS / CS-I
The filter 25 (for example, L
PF) and is combined with a BS / CS-IF signal from an input terminal 8 and an input terminal 9 to be described later to form a distribution circuit 36.
Is input to The downstream signal (specifically, the bidirectional downstream signal, or the signal obtained by combining the BS / CS-IF signal) equally divided by the distribution circuit 36 blocks the bidirectional upstream signal as the first downstream signal path. , A filter 26 that passes a bidirectional downlink signal, a BS-IF signal, and a CS-IF signal (for example, L
PF). The signal passing through the filter 26 is
After being input to the distribution / mixing circuit 27 and divided into four,
Each signal is output to the bidirectional output terminal 10 via the upstream signal blocking changeover switch circuit 12 and the power signal separation filter 41, transmitted through the coaxial cable connected to the bidirectional output terminal 10, and transmitted to the BS / CS tuner 6, the TV. It is received by the receiver 56. The signal equally distributed by the distribution circuit 36 is used as a filter 2 as a second downstream signal path of the downstream signal.
The downstream signal input to the filter 37 and the distribution circuit 38 having the same characteristics as the signal 6 and divided into four by the distribution circuit 38 is output to the unidirectional output terminal 11 via the power signal separation filter 41. The coaxial cable connected to the unidirectional output terminal 11 is transmitted and received by the BS / CS tuner 6 and the TV receiver 56. If the performance can be satisfied without the filter 37, the filter 37 may be omitted.

Next, the CS signal is sent to the CS antenna 3 and CS
The CS-IF signal received by converter 3a is output from CS converter 3a. The CS-IF signal is transmitted between the CS converter 3a and the input terminal 8 of the amplifier 5 via a coaxial cable, and is input to the input terminal 8. Input terminal 8
The CS-IF signal input to the power supply signal separation filter 49 described later is input to the amplifier 5. The CS-IF signal input to the power supply signal separation filter 49 passes through the attenuation circuit 28, the gain adjustment circuit 29, the CS-IF signal, and blocks the BS-IF signal.
(For example, an HPF), is combined with a BS-IF signal transmitted from an input terminal 9 described later, is amplified to a predetermined level by an amplifier circuit 34, blocks a CATV downstream signal, and outputs a CS / BS-IF signal. Filter 35 that passes only
Transmitted to CS / BS- passed through the filter 35
The IF signal is combined with the bidirectional downstream signal and transmitted to the distribution circuit 36. Note that the process of transmission from the distribution circuit 36 to the bidirectional output terminal 10 and the unidirectional output terminal 11 is the same as the transmission of the bidirectional downstream signal, and a description thereof will be omitted.

Similarly, the BS signal is transmitted to BS antennas 4 and B
The BS-IF signal received by the S converter 4a is output from the BS converter 4a. BS-IF signal is BS
The signal is transmitted between the converter 4a and the input terminal 9 of the amplifier 5 by a coaxial cable and input to the input terminal 9. The BS-IF signal input to the input terminal 9 is input to the power signal separation filter 49 and is taken into the amplifier 5. The BS-IF signal input to the power signal separation filter 49 passes the attenuation circuit 31, the gain adjustment circuit 32, the BS-IF signal, and blocks the CS-IF signal (for example, L
PF), is combined with the CS-IF signal, and input to the amplifier circuit 34. The process of transmitting the signal from the amplifying circuit 34 to the bidirectional output terminal 10 and the unidirectional output terminal 11 is the same as the transmission of the CS-IF signal, and a description thereof will be omitted.

Next, when 100 V AC is applied to the plug 39, 15 V DC is output by the power supply circuit 40.
DC15V is supplied to the amplifier circuits 15,23,34. Further, DC 15 V is also supplied to a power signal separation filter 49 connected to the input terminal 9. As shown in FIG. 5, the power supply signal separation filter 49 includes a capacitor 51 for passing a BS-IF signal and blocking DC between a BS-IF signal input / power supply output terminal 49a and a BS-IF signal output terminal 49b. A choke coil 52 is connected between the power supply output terminal 49a and the power supply input terminal 49c to allow direct current to pass and block a BS-IF signal. The power supply separation filter 49 connected to the input terminal 8 has the same configuration, but has a CS-IF signal input / power supply output terminal 49a.
The choke coil 52 connected between the power supply terminal 49c and the power supply input terminal 49c receives a direct current used as an operation power supply of the CS converter 3a and also used for polarization switching, and a low frequency signal or pulse signal for polarization switching. Let it pass. In addition, BS
The IF signal input / power output terminal 49a is connected to the input terminal 9;
, And a BS-IF signal output terminal 49b is connected to the attenuation circuit 31. A power input terminal 49c is connected to the power circuit 40.

Next, when the user tunes to the CS tuner 6 or the STB 59 connected to the bidirectional output terminal 10 and the unidirectional output terminal 11 while receiving the CS-IF signal, the polarization switching corresponding to the selected channel is performed. The signal is output to the CS tuner 6 and the reception input terminal of the STB 59 (in this embodiment, DC 11 V or 15 V). The polarization switching signal is transmitted to the CS tuner 6 and the coaxial cable connected to the STB 59, and is input to the bidirectional output terminal 10 or the unidirectional output terminal 11. The polarization switching signal input to the bidirectional output terminal 10 and the unidirectional output terminal 11 is input to the CS-IF signal output / polarization switching signal input terminal 41b. As shown in FIG. 4, the power supply signal separation filter 41 includes a CS-IF
The CS-IF signal is passed between the signal input terminal 41a and the CS-IF signal output / polarization switching signal input terminal 41b,
A capacitor 46 for blocking a DC or low frequency signal is connected, and a CS-IF signal output / polarization switching signal input terminal 41 is connected.
A choke coil 47 and a diode 48 for passing a DC or low-frequency signal and blocking a CS-IF signal are connected in series between b and the polarization switching signal output terminal 41c. The CS-IF signal input terminal 41a is connected to the upstream signal blocking switch 12, and the CS-IF signal output / polarization switching signal input terminal 41b is connected to the bidirectional output terminal 1.
0 or connected to the unidirectional output terminal 11. The polarization switching signal output terminal 41c is connected to the power input terminal 49c connected to the input terminal 8. The diode 4
8 is a plurality of bidirectional output terminals 10 and unidirectional output terminals 11
And a backflow prevention diode for preventing the BS / CS tuner 6 and the STB 59 from failing when the polarization switching signal of the CS reception signal is input at the same time. Further, the OR connection of the diode 48 causes the bidirectional output terminal 10,
The BS / CS tuner 6 and the STB 59 can be connected to any of the unidirectional output terminals 11. Next, as shown in FIG. 2, the upstream signal blocking changeover switch 12 blocks the two-way two-point switch 50, the two-way upstream signal and the two-way downstream signal,
Filter 4 that passes BS-IF signal and CS-IF signal
2 (for example, HPF) are connected as shown in the figure.
By operating the two-circuit two-contact switch 50, bidirectional transmission or unidirectional transmission can be selected. When the switch 50 is selected on the 50a side, a bidirectional upstream signal,
This is a bidirectional transmission in which the bidirectional downlink signal, CS-IF signal, and BS-IF signal can all pass. On the other hand, when the switch 50 is selected to the 50b side, a filter 42 (for example, an HPF) that blocks a bidirectional upstream signal and passes a downstream signal is provided in series, and blocks a bidirectional upstream signal.
This is a unidirectional transmission in which only a so-called downlink signal of a bidirectional downlink signal, a CS-IF signal, and a BS-IF signal can pass.

Next, as shown in FIG. 3, the band switching circuit 17 includes a two-circuit three-contact switch 43 and a filter 44 (for example, an HPF) that can pass a signal in a part of the band (for example, 30 MHz to 55 MHz) of the bidirectional upstream signal. ) And two terminating resistors 45 connected as shown in FIG. By operating the two-circuit three-contact switch 43, the entire band of the bidirectional upstream signal (for example, 10 MHz to 55 MHz) is passed, or a part of the band of the bidirectional upstream signal (for example, 3 MHz).
0 MHz to 55 MHz) only, or
It is possible to select whether to block the passage of the bidirectional uplink signal. Specifically, two circuits 3
When the contact switch 43 selects the side 43a, the signal of the entire band of the bidirectional upstream signal can pass from the bidirectional output terminal 10 to the input terminal 7. When the 43b side is selected by the two-circuit three-contact switch 43, the bidirectional output terminal 10
From the input terminal 7, only signals in a part of the band among the bidirectional upstream signals can pass. When the 43c side is selected by the two-circuit three-contact switch 43, the bidirectional output terminal 1
The bidirectional upstream signal input from 0 is terminated by the terminating resistor 45. Further, since one end of the gain adjustment circuit 16 is also terminated by the terminating resistor 45, a bidirectional upstream signal can be blocked without disturbing the circuit impedance. Therefore,
There is an effect that the isolation between the input and the output is increased as compared with the case where the unidirectional signal is selected by the up signal blocking switch 12.

The main body of the amplifier 5 is made of aluminum die-cast, so that it has good shielding properties and is not affected by external noise. In FIG. 7, an input terminal 7 is provided on the bottom surface.
An input terminal 8, an input terminal 9, and a plug 39 are protruded, and a plurality of bidirectional output terminals 10 and a unidirectional output terminal 11 are protruded on the upper surface. As shown in FIG. 9, the unidirectional output terminal 11 has a step difference of L before and after. this is,
This is to facilitate the work of attaching and detaching the F-type plug C when the amplifier 5 is installed on the wall W. Thus, work can be easily performed even in a small place such as a distribution board. Further, since the upstream signal blocking switch 12 is provided near each bidirectional output terminal 10, operation errors can be prevented as compared with the case where the upstream signal blocking switch 12 is provided intensively. A band switching circuit 17 and a filter 24 are provided on the front side.
9, 32, and attenuation circuits 14, 21, 28, 31 are provided as shown in the figure. Further, a pilot lamp PL indicating an operation state is provided at the upper right of the front. The pilot lamp PL is turned on during operation. In the above-described embodiment, the case where the amplifier 5 is used for indoor use has been described. However, by housing the amplifier 5 in a waterproof case, it can be easily changed according to the situation, such as use outdoors.

Next, the arrangement of the terminals of the amplifier 5 and the changeover switch embodying the present invention will be described. FIG. 7 is a perspective view, and FIG. 8 is a plan view. In this example, with respect to the four unidirectional output terminals 11, the four upstream signal blocking changeover switches 12 associated therewith are arranged in the vicinity of the corresponding output terminals. For this reason, even if a display for identifying the upstream signal blocking changeover switch 12 associated with the output terminal 11 is not provided, there is no mistake in the correspondence between them. In the above embodiment, four sets of the output terminal 11 and the upstream signal blocking changeover switch 12 have been described. However, a plurality of input terminals, a signal attenuation switch, and a switch for electrically terminating the plurality of output terminals are provided. Etc. may be used. In the embodiment, the plurality of terminals and the plurality of changeover switches connected to the terminals are arranged in two rows, but may be arranged in one row. In the embodiment, as shown in FIG. 9, a plurality of terminals and a plurality of changeover switches connected to the terminals are provided in two stages before and after, but may be provided in three or more stages. Further, the pedestal 60 may be formed integrally with the case, or the pedestal 60 may be formed of a separate spacer to change the height. Further, in order to make the height of the plug different, the length of the screw portion of the plug may be increased. Very close means that there is no problem in attaching and detaching the connector,
This is a position where the up signal blocking switch 12 can be operated even if there is a connector after mounting. In the embodiment, the closest distance between the bidirectional output terminal 10 and the upstream signal blocking switch 12 is set to 3.5 mm.

[0015]

As described above in detail, according to the first aspect of the present invention, by disposing a switch related to a plurality of terminals in the vicinity of the terminals, the relation between the switches and the terminals can be easily identified. In addition, erroneous operation of the switch with respect to the terminal can be prevented, and workability when setting the device for joint reception is improved.

According to the second aspect of the present invention, the difference in height between the front row and the rear row is provided, so that the workability when mounting the connector is improved.

According to the third aspect of the present invention, by providing a plurality of changeover switches for preventing ingress noise for a plurality of output terminals, a high quality image service is provided to a user of the bidirectional CATV. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a joint receiving device.

FIG. 2 is a circuit diagram of an up switch 12;

FIG. 3 is a circuit diagram of a band switch 17;

FIG. 4 is a circuit diagram of a power supply signal separation filter 41.

FIG. 5 is a circuit diagram of a power signal separation filter 49;

FIG. 6 is a configuration diagram showing a configuration of a system using a joint receiving device.

FIG. 7 is a perspective view of a joint receiving device.

FIG. 8 is a plan view of the joint receiving device.

FIG. 9 is a side view of the joint receiving device.

[Explanation of symbols]

1 ... house, 2 ... service line from CATV system, 3a ...
CS converter, 4a… BS converter, 5… Amplifier,
6 BS / CS tuner, 7 input terminal, 8 input terminal, 9 input terminal, 10 bidirectional output terminal, 11 unidirectional output terminal, 12 uplink signal blocking switch, 14
Attenuating circuit, 15 ... amplifying circuit, 17 ... band switching circuit, 41
... power signal separation filter, 49 ... power signal separation filter, 56 ... TV or TV with built-in BS / CS tuner, 57 ... cable modem

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaaki Nagase 80, Noboru, Asada-cho, Nisshin-shi, Aichi Prefecture, inside Maspro Electric Works Co., Ltd. Terms (reference) 5C056 FA08 HA14 JA01 JA06 5C064 BA02 BB10 BC13 BC14 BC20

Claims (3)

[Claims] 1. A joint receiving device having an input terminal, an output terminal, and the like used for a CATV, wherein a plurality of changeover switches electrically connected to the plurality of terminals are provided on a surface of a case, and a pole of the terminal is provided. A joint receiving device, which is provided in the vicinity. 2. The joint receiving device according to claim 1, wherein:
A shared receiving device comprising a plurality of terminals, wherein the arrangement of the terminals is a plurality of rows, and the height of the terminals in the front row is lower than that in the rear row. 3. The joint receiving device according to claim 1, wherein the terminal is an output terminal, and the changeover switch is a changeover switch for selecting a filter for preventing ingress noise.