JPH0110029Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a broadcast receiving device used to receive general television broadcasting and satellite broadcasting with one television receiver.

2. Description of the Related Art Conventionally, when a general television broadcast is received by a television receiver, the general television broadcast signal received by an antenna is sometimes amplified by a booster and then supplied to the television receiver. In addition, when receiving satellite broadcast signals, the satellite broadcast signals received by the antenna are frequency-converted by a converter, and processed by processing circuits such as a demodulator and RF converter into signals that can be received by the receiver. It is being supplied to the machine. Therefore, in order to be able to receive satellite broadcasting signals with a receiver that has already received general television signals amplified from a booster, it is necessary to connect the output transmission path from the processing circuit in addition to the output transmission path from the booster. The wiring had to be connected to the machine, which was a hassle. In addition, operating current must be supplied to the booster, converter, and processing circuit in order to operate them, but since both broadcasts are received by one receiver, it is not possible to receive both broadcasts at the same time. When receiving satellite broadcasting, there is no need to supply operating current to the converter and processing circuit, and when receiving satellite broadcasting, there is no need to supply operating current to the booster. Nevertheless, the booster, converter, and processing circuit are constantly supplied with operating current, which is undesirable from an energy saving perspective.

The purpose of this invention is to provide a broadcast receiving device that can receive general television broadcasts and satellite broadcasts with one receiver, which requires only one wire for the receiver, and which can save power. purpose.

Hereinafter, this invention will be explained in detail based on one embodiment shown in the drawings. In the figure, reference numeral 2 denotes a satellite broadcast receiving antenna, and the satellite broadcast signal received by this antenna is converted into a low frequency signal by a converter 4. Also 6
is a general television broadcast reception antenna, and the general television broadcast received by this antenna is amplified by a booster 8. The converted signal from the converter 4 and the amplified signal from the booster 8 are supplied to the broadcast receiving apparatus 10 according to this invention via separate coaxial cables.

The broadcast receiving device 10 includes a demodulator 12 and an RF converter 14 for processing the converted signal from the converter 4, and further includes the converter 4 and the demodulator 12.
and a power supply 16 for the RF converter 14. The converted signal from the converter 4 is supplied to the demodulator 12 through a capacitor 17 and a high frequency blocking coil 1.
converter side terminal 2 of the superimposition circuit 20 consisting of
This is done by connecting 0a to the converter and connecting the output terminal 20b of the superimposing circuit 20 to the demodulator 12. converter 4, demodulator 12 and
The supply of operating current to the RF converter 14 is as follows:
Connecting the power supply terminal 20c of the superimposition circuit 20, the power supply side of the demodulator 12, and the power supply side of the RF converter 14,
A switch 22 switches between this connection point 21 and the power supply 16.
This is done by connecting. That is,
This connection point 21 is connected to the contact 22a of the switch 22.
, connect the power supply 16 to the contact 22b of the changeover switch 22, and connect the power supply 16 to the contact 22c of the changeover switch 22.
is used as a free contact.

The output of the RF converter 14 and the output of the booster 8 are selectively supplied to a television receiver 26 by a changeover switch 24. That is, the output side of the booster 8 is connected to the contact point 24c of the changeover switch 24, the output side of the RF converter 14 is connected to the contact point 24a of the changeover switch 24, and the changeover switch 24
The contact 24b is connected to the television receiver 26 via a coaxial cable. In addition, 28 is a power supply for the booster 8, 30 is a superimposition circuit for superimposing the operating current from this power supply 28 on the coaxial cable, and 32 is a power supply when the contactor 24b of the changeover switch 24 is switched to the contact 24a side. This is a capacitor that prevents the operating current from 28 from flowing toward the RF converter 14 side.

The changeover switches 22 and 24 are configured to interlock, and the contactor 22b of the changeover switch 22
is in contact with the same contact 22a, the contact 24b of the changeover switch 24 is in contact with the same contact 24a,
Conversely, the contact 22b of the changeover switch 22 is the same contact 2.
2c, the contact 24b of the changeover switch 24 contacts the same contact 24c.

Television receiver 2 for general television broadcasts
6, as shown in the figure, the contact 22b of the changeover switch 22 is brought into contact with the contact 22c, and the contact 24b of the changeover switch 24 is brought into contact with the contact 24c.
All you have to do is contact it. As a result, an operating current is supplied from the power supply 28 to the booster 8 via the superimposing circuit 30 and the changeover switch 24, and the booster 8 is operated. The booster 8 amplifies the signal received by the antenna 6 and sends it to the switch 24 and the superimposing circuit 30.
The signal is supplied to the television receiver 26 via. At this time, the contact 22b of the changeover switch 22 is the contact 2
2c side, no operating current is supplied to the converter 4, demodulator 12, and RF converter 14.

Further, when satellite broadcasting is to be received by the television receiver 26, the contact 22b of the changeover switch 22 may be brought into contact with the contact 22a, and the contact 24b of the changeover switch 24 may be brought into contact with the contact 24a. As a result, operating current is supplied from the power supply 16 to the demodulator 12, the RF converter 14, and the converter 4, the converter 4, the demodulator 12, and the RF converter 14 start operating, and the converter 4 converts the frequency of the satellite broadcast signal. This converted signal is sent to the demodulator 12
and processed by an RF converter. This processed signal is supplied to the television receiver 26 via the changeover switch 24 and the superimposing circuit 30. At this time, since the contact 24b of the changeover switch 24 is separated from the contact 24c, no operating current is supplied from the power supply 28 to the booster 8, and the booster 8 does not operate. Note that since the capacitor 32 is provided on the output side of the RF converter 14, no current is supplied from the power supply 28 to the output side of the RF converter 14.

In this broadcast receiving apparatus 10, a changeover switch 2 is used to switch between the output of the booster 8 and the output of the RF converter 14.
4, the signal is switched and supplied to the television receiver 26, so that wiring from the broadcast receiving device 10 to the television receiver 26 requires only one coaxial cable, simplifying the wiring. Furthermore, the converter 4, demodulator 12, and RF converter 14 are controlled so that operating current is not supplied to the converter 4, demodulator 12, and RF converter 14 when the booster 8 is operated by the changeover switches 22 and 24, and the converter 4, demodulator 12, and RF converter 14 are Since no operating current is supplied to the booster 8 during operation, power can be saved.

In the above embodiment, the booster 8, the superimposition circuit 30
Although a power source 28 and a power source 28 are provided, if general television broadcasting can be sufficiently received without amplification by the booster 8, these devices are unnecessary.

[Brief explanation of the drawing]

The figure is a block diagram of a broadcast receiving apparatus according to this invention. 4...Converter, 10...Broadcast receiving device, 1
2, 14...processing circuit, 16...power supply, 20...
Superimposition circuit, 22...first switch, 24...second
Switch, 26...TV receiver.

Claims (1)

[Scope of utility model registration request] A processing circuit that processes a converted signal obtained by frequency-converting a satellite broadcasting signal by a converter into a signal that can be received by a television receiver, a power supply for the converter and the processing circuit, and an operating current given from the power supply to the power supply terminal as described above. a superimposition circuit that supplies the converted signal to the output transmission line of the converter and the converted signal extracted from the output transmission line to the processing circuit;
A first intervening point between the power supply terminal of the superimposing circuit and the power supply side of the processing circuit and the power supply.
switch, and a second switch that switches and connects the general television signal transmission path and the output side of the processing circuit to the television receiver, and the second switch connects the first and second switches to the output side of the processing circuit. A broadcast receiving device, wherein when the output side is connected to the television receiver, a first switch is interlocked to connect the power source to the interconnection point.