JPS63306719A - Television broadcast reception system - Google Patents

Abstract

PURPOSE:To obtain an inexpensive reception system where installation work is simplified with the use of only one coaxial cable by mixing each system TV signal outdoor and receiving the signal indoor through a transmission line and forming the image via a BS tuner or a power supply device. CONSTITUTION:A part of an AC from a power circuit 13g is fed to a BS tuner 13 and the remaining signal is converted into a DC (solid lines) by a rectifier circuit 13h and fed to the constant voltage circuit 5f of the BS converter 5 via a transmission line 19. On the other hand, the AC from a power supply circuit 12d is converted into a DC (dotted lines) at a rectifier circuit 12e and fed to a constant voltage circuit 3g through the transmission line 19. An SHF signal from a satellite is converted into an intermediate frequency by the converter 5. A ground broadcast signal in VHF or UHF is amplified and mixed with the intermediate frequency by a mixer 6, drawn indoor through the line 19 and branched by a branching device 9. The intermediate frequency by way of the BS tuner and the TV signal of VHF/UHF by way of the power supply device 12 and the tuner 13 are both mixed at an RF modulation circuit 16 and fed to an AV television set 18.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a television broadcast receiving system that receives both VHF and UHF terrestrial television broadcasts and SHF broadcasts from satellites.

(Prior art) In the above-mentioned television broadcast receiving system, vHF and UH
Separate coaxial cables are used for the system that receives the terrestrial television broadcast signal from F and the system that converts the SHF broadcast signal from the satellite into an intermediate frequency signal using a BS converter and receives this signal from outside. The signal is brought indoors.

(Problems to be Solved by the Invention) The conventional television broadcast receiving system described above has the following problems. That is, since multiple coaxial cables are required to bring signals from outdoors to indoors, the cost is high and the installation work is troublesome. Therefore, an attempt was made to mix the above signals outdoors using a mixer and connect them with a single coaxial cable, but this made it difficult to supply power from indoors to outdoors, so vHF-? Even if the UHF signal level was weak and I wanted to amplify it or convert UHF to VHF, I had no choice but to give up.

The present invention has been made to solve the above-mentioned problems, and is capable of amplifying and converting the frequency of VHF + UHF terrestrial TV broadcast signals and bringing them indoors, and also enables SHF broadcast signals from satellites to be brought into the house at an intermediate frequency. To provide a television broadcast receiving system which can be converted into a signal and brought indoors, and which requires only one coaxial cable to be used, so that the cost is low and the installation work is simple.

(Means for Solving the Problems) In order to solve this object, we have taken the measures described in the claims, and their effects are as follows.

(effect) The direct current from the BS tuner goes through a splitter and transmission line.

It passes through a mixer and is connected to the BS converter of the SHF broadcast reception system, where it is activated.

A direct current having the same voltage as the above-mentioned direct current is passed from the power supply through a branching filter, a transmission line, and a mixer to operate the active equipment of the terrestrial television broadcast receiving system.

The signal from the SHF broadcast receiving system is sent to the mixer and the above transmission line 2.
A branching filter and BS tuner are added to the TV receiver.

Furthermore, the signal that has been actively processed in the terrestrial television broadcast receiving system passes through the mixer, the transmission line splitter, and the power supply, and is applied to the television receiver.

(Example) The drawings showing the embodiments of the present application will be described below.

FIG. 1 is a system diagram of a television broadcast receiving system, a part of which is shown as a circuit diagram. 1 indicates a VHF antenna, and 2 indicates a UHF antenna. 3 is an amplifier, also commonly called a booster. In the amplifier 3, 3a represents a VHF input terminal, 3b represents a UHF input terminal, and 3c represents an output terminal. 3d represents an amplifier circuit, 3e represents a choke coil, and 3f represents a capacitor. 3g indicates a constant voltage circuit provided as necessary.

Next, 4 indicates a parabolic antenna, and 5 indicates a BS converter. As is well known, the BS converter 5 is 11.7 to 12.0
It frequency-converts the GHz SHF broadcast signal into a 1.0 to 1.3 GHz intermediate frequency signal and outputs it. B
In the S converter 5, 5a indicates an input terminal, 5b indicates an output terminal (, 5c indicates a frequency conversion circuit, 5d indicates a choke coil, and 5e indicates a capacitor. 5f indicates a constant voltage circuit provided as necessary. 6). indicates a mixer, and 6
a indicates a VHF and UHF input terminal, 6b indicates an intermediate frequency input terminal, and 6c indicates an output terminal. Reference numeral 7 denotes a low-pass filter, which is composed of coils 7a and 7b and a capacitor 7c as shown. Reference numeral 8 denotes a bypass filter which, as shown in the figure, uses a choke coil 8a to allow the power supply direct current to pass therethrough as well. 8b is a coil, and 8c and 8d are capacitors.

The above are devices that can be installed outdoors. Next, the equipment placed indoors is shown. 9 is a duplexer, 9a is an input terminal, 9b is a VHF and UHF output terminal, and 9c is an intermediate frequency output terminal. Reference numeral 10 denotes a low-pass filter, which has the same configuration as the aforementioned low-pass filter 7. Reference numeral 11 denotes a bypass filter, which has the same configuration as the bypass filter 8 described above. 12 is a power supply, 12a
12b is an amplifier connection terminal, 12b is a TV connection terminal, and 012c is an AC plug. 12d is a power supply circuit consisting of a power transformer. 12e is a rectifier circuit, 12f is a choke coil, and 12g is a capacitor. 13 is a BS tuner, 13a is an intermediate frequency input terminal, and 13b is a VHF
and UHF input terminal, 13c is a video output terminal, 13d is an audio output terminal, and 13e is an RF output terminal. 13
f is an AC plug. 13g is a power supply circuit composed of a power transformer. 13h indicates a rectifier circuit.

As is well known, the BS tuner 13 can supply power for operating only the BS converter 5, and 131 is a choke coil and 13j is a capacitor. 14 is a channel selection circuit, 15 is a demodulation circuit, 16 is an RF modulation circuit, and 17 is a mixing circuit.

18 is an AV television, 18a is a video input terminal, 18b is an audio input terminal, and 18c is an RF input terminal.

19 is a transmission line, and a coaxial cable is used.

Reference numeral 19a indicates a center conductor, and reference numeral 19b indicates an outer conductor.

In the television broadcast receiving system with the above configuration, part of the AC from the power supply circuit 13g is supplied to each circuit in the BS tuner 13, and the rest is supplied to the rectifier circuit 13h as DC with a voltage of 15V and a current of 180 mA. As shown by solid arrows in FIG. 1, the voltage flows through the transmission line 19 and inside each device, passes through the output terminal 5b of the BS converter 5, and is applied to the constant voltage circuit 5f.

This DC power with a voltage of 15 V and a current of 180 mA is consumed by the frequency conversion circuit 5c and the constant voltage circuit 5f.

On the other hand, the alternating current from the power supply circuit 12d becomes direct current with a voltage of 15 V and a current of 100 mA in the rectifier circuit 12e, and flows through the transmission line 19 and inside each device as shown by the dotted line arrow in FIG. It passes through the terminal 3c and is applied to the constant voltage circuit 3g. This DC power with a voltage of 15 V and a current of 100 mA is consumed by the amplifier circuit 3d and the constant voltage circuit 3g.

Next, the high frequency signal will be explained. A VHF or UHF terrestrial television broadcast signal is amplified by an amplifier 3 and mixed with an intermediate frequency signal from a BS converter 5 by a mixer 6. The mixed signals are led into the house by a power supply line 19 and separated by a branching filter 9.

The intermediate frequency signal is transmitted from the output terminal 9C to the BS tuner 13, subjected to well-known processing, and then applied to the AV child television 8. On the other hand, VHF and UHF television signals are transmitted from the output terminal 9b to the power supply 12, and the TV connection terminal 12b
from there to the BS tuner 13. In the BS tuner 13, the signal is mixed with the SHF broadcast signal converted to the TV channel 13 by the RF modulation circuit 16,
Sent to AV Child TV 8.

Therefore, unnecessary power consumption can be prevented.

Furthermore, the power supply circuit 13g originally built into the BS tuner 13 can be effectively utilized.

(Effects of the Invention) As described above, the present invention has the advantage that it is possible to perform active processing such as amplification on VHF or UHF terrestrial television broadcast signals and bring them indoors.

Moreover, the SHF broadcast signal from the satellite is also converted into an intermediate frequency signal and has the effect of being brought indoors with less signal loss.

Furthermore, since both the above-mentioned terrestrial television broadcast signal and intermediate frequency signal can be brought indoors through a single transmission line, installation work can be easily completed.

[Brief explanation of drawings]

The drawings relate to embodiments of the present application, and FIG. 1 is a system diagram showing a partial circuit diagram of a television broadcast receiving system. 1... VHF antenna, 3... Amplifier, 4... Φ・Harabola antenna, 5... BS converter, 6... φ mixer, 9... Duplexer, 12... Power supply, 13.
...BS tuner, 18...Temple AV TV, 19...
・Transmission line. Patent applicant: Maspro Electric Works Co., Ltd. Representative Takashi Hatayama

Claims (1)

[Claims] A terrestrial television broadcast receiving system and a satellite SHF broadcast receiving system are installed outdoors, and the signals from each system are mixed by a mixer and brought indoors via a single transmission line. The signal from the SHF reception system is applied to the BS tuner, while the signal from the terrestrial television broadcast reception system is applied to the television receiver via a power supply. TV broadcast reception system.