JP3031052B2 - Satellite broadcast receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving apparatus.

[0002]

2. Description of the Related Art In recent years, the demand for satellite broadcast receivers has been rapidly increasing in response to an increase in satellite broadcast reception needs. Also one
One is combined with a television receiver, the other is a VTR
Due to increasing demand for additional purchases, such as in combination with a satellite broadcast receiver, a satellite broadcast receiver equipped with a detection input terminal and a bit stream input terminal for sharing a pay broadcast decoder and a satellite broadcast receiver with a built-in distributor are on the market.

[0003] A conventional satellite broadcast receiving apparatus will be described below. FIG. 2 shows a block diagram of a conventional satellite broadcast receiver. In FIG. 2, 1 is a distributor, and 2 is a demodulation circuit. Reference numerals 3, 4, and 5 denote first, second, and third switch circuits, respectively, which are usually constituted by electromagnetic relays. Reference numeral 6 denotes an antenna power supply for supplying an operation power of the satellite broadcast receiving antenna. Reference numerals 7 and 8 denote DC cut capacitors, and reference numeral 9 denotes a choke coil. 51 is BS-IF output terminal, 52 is B
An S-IF input terminal, 53 is a bit stream signal input terminal, 54 is a bit stream signal output terminal, 55 is a detection signal input terminal, 56 is a detection signal output terminal, and 57 is an AC power outlet.

[0004] With respect to the satellite broadcast receiving apparatus composed of the above components, the relationship and operation of each component will be described below. First, a satellite broadcast signal received by the satellite broadcast receiving antenna 70 is frequency-converted into a BS-IF signal by a satellite broadcast converter (hereinafter simply referred to as a converter) 71 attached to the satellite broadcast receiving antenna 70, and the first satellite It is guided to the BS-IF input terminal 51 of the broadcast receiver 50. The BS-IF input signal is input to the distributor 1 via the capacitor 8, where it is divided into two, and one is output as the BS-IF output signal via the capacitor 7. BS
-By connecting the second satellite broadcast receiver 60 to the IF output, the second satellite broadcast receiver 60 can also receive satellite broadcasts. The demodulation circuit 2 demodulates the BS-IF signal into a video signal and an audio signal and outputs the demodulated signal. The demodulation circuit 2 also outputs a detection signal and a bit stream signal to be supplied to the pay broadcast decoder. The first switch circuit 3 outputs a bit stream output of the first satellite broadcast receiver 50 or a second
Of the bit stream input from the satellite broadcast receiver 60 is output. The second switch circuit 4 selects whether to output a detection output from the first satellite broadcast receiver 50 or to output a detection input from the second satellite broadcast receiver 60. The first and second switch circuits 3 and 4 are linked. If the bit stream output and the detection output of the second satellite broadcast receiver 60 are connected to the bit stream signal input terminal 53 and the detection signal input terminal 55 of the first satellite broadcast receiver 50, respectively, the first satellite broadcast When the receiver 50 is receiving a pay broadcast, the bit stream output and the detection output of the first satellite broadcast receiver 50 are used as the bit stream terminal 54 and the detection signal output terminal 56 of the first satellite broadcast receiver 50, respectively. When the first satellite broadcast receiver 50 is not receiving a pay broadcast, the second satellite broadcast receiver 60
Can receive paid broadcasts.

A third switch circuit 5 is an AC power switch for the first satellite broadcast receiver 50. When the third switch circuit 5 is turned on, it supplies AC power to the inside of the device, and also supplies AC power to an AC power outlet 57 provided in the housing. Therefore, if a pay broadcast decoder is connected to the AC power outlet 57, the pay broadcast decoder operates only when the first satellite broadcast receiver 50 operates.

The converter power supply 6 for supplying the operation power of the converter 71 usually has three modes: on / interlock / off. When it is turned on, the operating power is supplied to the converter 71 regardless of whether the first satellite broadcast receiver 50 is operating or not. When linked, the first satellite broadcast receiver 5
0 supplies operation power to the converter 71 only during operation.
When the power is off, no operating power is supplied to the converter 71 regardless of whether the first satellite broadcast receiver 50 is operating or not.

[0007]

However, in the above-mentioned conventional configuration, whether or not the second satellite broadcast receiver is operating cannot be detected by the first satellite broadcast. Has to be operated when the first satellite broadcast receiver is operated. To receive a pay broadcast with the second satellite broadcast receiver without operating the first satellite broadcast receiver, the AC power supply of the pay broadcast decoder must be connected to the AC power outlet of the first satellite broadcast receiver. In this case, the power switches of the first satellite broadcast receiver and the pay broadcast decoder must be turned on / off separately. This has a problem that not only a trouble of operation but also a timer must be provided in the pay-broadcast decoder when used in combination with the VTR. Further, in the above-described conventional configuration, whether or not the second satellite broadcast receiver is operating cannot be detected by the first satellite broadcast receiver. Therefore, in order to receive the satellite broadcast with the second satellite broadcast receiver, There is also a problem that the converter power supply of the first satellite broadcast receiver must be turned on and the operating power supply of the converter must always be supplied.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a satellite broadcast receiver provided with a circuit for detecting whether the second satellite broadcast receiver is operating.

[0009]

In order to achieve this object, a satellite broadcast receiving apparatus according to the present invention has a configuration provided with a circuit for detecting whether a converter power supply of a second satellite broadcast receiver is output. doing.

[0010]

According to the present invention, the pay broadcast decoder can be operated in conjunction with the operation of the second satellite broadcast receiver. Further, according to this configuration, the antenna power supply of the first satellite broadcast receiver is linked, and the operation power supply of the satellite broadcast receiving antenna is linked with the operation of the first satellite broadcast receiver and the second satellite broadcast receiver. Can be supplied.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 60, 70, and 71 are the same as those of the conventional example, and therefore, the description thereof is omitted here. 1
Reference numeral 50 denotes a first satellite broadcast receiver according to the present invention.
9, 51 to 57 are not different from the description of the conventional example, and the description is omitted here. Next, the newly added portion will be described. Reference numeral 20 denotes a choke coil, reference numeral 21 denotes a detection circuit for detecting the presence or absence of a DC voltage, reference numeral 22 denotes a converter power supply 6 which is turned off only when both the output of the detection circuit 21 and the DC power supply of the first satellite broadcast receiver 50 are not present. It is a control circuit.

With respect to the satellite broadcast receiving apparatus composed of the above-mentioned components, the relationship and operation of each component will be described below. Regarding the operation, the same points as in the conventional example will not be described. The BS-IF output terminal 51 is connected to the second satellite broadcast receiver 6
Since the converter power supply 0 is internally connected, the detection circuit 21 detects the presence / absence of a DC voltage via the BS-IF output terminal 51 and the choke 20, and the second satellite broadcast receiver 6
0 is detected whether or not the converter power supply 6 is operating, and the converter power supply 6 is turned on / off via the control circuit 22. When the detection circuit 21 detects that there is no DC voltage at the BS-IF output terminal 51, that is, when the second satellite broadcast receiver 60 is not operating, and the first satellite broadcast receiver 50 also operates. Only when it is not, the control circuit 22 turns off the converter power supply 6, and when one or both of the first satellite broadcast receiver 50 and the second satellite broadcast receiver 60 are operating, the control circuit 22 22 turns on the converter power supply 6. Even when the first satellite broadcast receiver 50 is not operating, the detection circuit 21 needs to be operated,
Since a single transistor can be used to detect a DC voltage, the detection voltage can be used as a power supply. The switch circuit 15 selects whether or not to output to the AC power outlet, and at the same time, selects the first satellite broadcast receiver 1.
In addition to the operation at the time of operation 50, when the detection circuit 21 detects the DC voltage, that is, when the second satellite broadcast receiver 60 is operating, the AC power is output to the AC power outlet 57. If the AC power input of the pay broadcast decoder is connected to the AC power outlet 57, the first satellite broadcast receiver 5
The pay-broadcast decoder can be operated in conjunction with the operation of the second satellite broadcast receiver 60 in addition to the operation at the time of 0.

The converter power supply 6 has three modes: on / interlock / off. When turned on, the operating power is supplied to the converter 71 regardless of whether the first satellite broadcast receiver 150 is operating or not. When interlocking, the first satellite broadcast receiver 150 supplies operating power to the converter 71 only when operating. When off, the first satellite broadcast receiver 15
Operation power is not supplied to the converter 71 regardless of whether the operation is 0 or not.

Therefore, the first satellite broadcast receiver 150,
If the converter power supply of the second satellite broadcast receiver 60 and the converter power supply of the second satellite broadcast receiver 60 are linked, the satellite broadcast is linked in conjunction with the operation of the first satellite broadcast receiver 150 and the second satellite broadcast receiver 60. The receiving antenna operates.

[0015]

As described above, according to the present invention, by providing a circuit for detecting whether or not the converter power of the second satellite broadcast receiver is being output, an additional circuit is provided during the operation of the first satellite broadcast receiver. Also, the pay broadcast decoder can be operated in conjunction with the operation of the second satellite broadcast receiver. That is, it is possible to realize a satellite broadcast receiver having excellent operability even when pay broadcast is received by the second satellite broadcast receiver.

Further, according to the present invention, since the circuit for detecting whether or not the converter power supply of the second satellite broadcast receiver is output is provided, the circuit is provided in addition to the operation of the first satellite broadcast receiver. The satellite broadcast receiving antenna can be operated in conjunction with the operation of the satellite broadcast receiver. That is, it is possible to provide a satellite broadcast receiving apparatus that operates as if a built-in bidirectional current passing type distributor is provided without changing the built-in distributor to the bidirectional current passing type.

[Brief description of the drawings]

FIG. 1 is a block diagram of a satellite broadcast receiving apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional satellite broadcast receiving apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 distributor 2 demodulation circuit 6 converter power supply (satellite broadcast converter power supply) 21 detection circuit 22 control circuit 51 BS-IF output terminal 52 BS-IF input terminal 60 second satellite broadcast receiver 70 satellite broadcast receiving antenna 71 converter (satellite) Broadcast converter) 150 1st satellite broadcast receiver

Claims (1)

(57) [Claims] A BS-IF signal from a satellite broadcast converter attached to a satellite broadcast receiving antenna is taken into a first satellite broadcast receiver, and a demodulation circuit in the first satellite broadcast receiver and a second satellite are provided. A distributor for distributing the BS-IF signal to a broadcast receiver; and a DC-input terminal for supplying a DC to the first satellite broadcast converter. A DC-connected satellite broadcast converter power supply and a BS-IF signal output terminal for supplying the BS-IF signal from the distributor to the second satellite broadcast receiver; A detection circuit for detecting whether or not a DC voltage exists at the terminal;
When the output of the detection circuit is input and the detection circuit detects the presence of a DC voltage, and when the detection circuit detects the absence of a DC voltage but the first satellite broadcast receiver is on, The DC output of the satellite broadcast converter power supply of the first satellite broadcast receiver is turned on, and the DC output of the satellite broadcast converter power supply of the first satellite broadcast receiver is turned on only when both the first and second satellite broadcast receivers are off. In a first satellite broadcast receiver having a control circuit for turning off an output ,
Link to ON / OFF of DC output of satellite broadcast converter power supply
A switch that operates to turn on / off an AC power output;
To take the output of the switch out of the satellite receiver
And an AC power outlet of the first satellite broadcast receiver.
Satellite broadcasting receiver provided for.