JPH0965326A - Repeater for burglar prevention television camera and home use television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce a video image and an audio signal from a burglar prevention television camera onto a home use television receiver by a radio wave. SOLUTION: This repeater is provided with a radio reception circuit 23 receiving a VHF radio wave E1 emitted from a transmitter connecting to a burglar-proof television camera installed at the outside of a house, a VHF/UHF converter 24 converting a VHF radio wave received by the radio reception circuit 23 into a UHF signal S6 , a radio transmission circuit 25 outputting a UHF signal on a carrier outputted from the VHF/UHF converter 24 to an indoor UHF antenna 29 connecting to an in-house television receiver 4 as a UHF radio wave E2 and a power supply section supplying power for the radio reception circuit 23 or the like. The power supply section is made up of a plug 27 plugged into a home use receptacle and an AC/DC converter 26 converting an AC power supply from the plug into a DC power supply.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a crime prevention television camera
The present invention relates to a relay device for a home television receiver, and more particularly to a relay device capable of simplifying wiring.

[0002]

2. Description of the Related Art Conventionally, a crime prevention television camera system is installed in a house or the like in order to prevent unauthorized entry of people. As shown in FIG. 4, this security television camera system has, for example, a television camera 51 provided near a doorway of a house for capturing an image of a human body, and a television monitor 52 provided in a room and displaying an image from the television camera 51. are doing. In such a configuration, when a person comes near the door, the television camera 51 takes an image, and the video signal S ₂₀ from the television camera 51 is output to the television monitor 52. Thereby, since the intruder can be confirmed, it is possible to prevent unauthorized intrusion.

[0003]

However, in such a security TV camera system 50, the TV camera 51 installed outdoors and the TV monitor 52 installed indoors must be connected by wire. Moreover,
Since the TV monitor 52 dedicated to the apparatus has to be installed, the installation work takes time and also causes the cost of the device to increase.

The present invention has been made to solve the above-mentioned conventional problems, and is a security TV camera / home TV that wirelessly reproduces images and sounds from the security TV camera on a home TV receiver. An object is to provide a relay device for a receiver.

[0005]

A relay device for a crime prevention television camera / home television receiver of the present invention which achieves such an object is a subject taken by a crime prevention television camera installed outside a house at home. Which is a relay device for displaying on a television receiver for television, a radio receiving circuit for receiving VHF radio waves radiated from a transmitter connected to a security television camera, and a VHF radio wave received by the radio receiving circuit into UHF signals VHF / UHF converter for conversion and VHF / UH
A radio transmitter circuit for receiving a UHF signal output from the F converter on a carrier wave and outputting it as an UHF radio wave to an indoor antenna connected to a home television receiver, a receiver circuit, and a VH
The power supply unit includes an F / UHF converter and a power supply unit that supplies power to the wireless transmission circuit. The power supply unit includes a plug to be plugged into a household outlet and an AC / DC converter that converts AC power from the plug into DC power. It is a thing.

Further, in the relay device of the security television camera / home television receiver of the present invention, the plug is a radio receiving circuit, a VHF / UHF converter, a radio transmitting circuit and
The C / DC converter is integrated with the casing that covers it.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a security TV camera system to which a relay device for a security TV camera / home TV receiver according to the present invention is applied will be described below with reference to the drawings. As shown in FIG. 1, the crime prevention television camera system is provided with a human body detection element 1, a crime prevention television camera 2 and a microphone 18 outdoors, and a transmitter 3 outdoors or indoors. The human body detection element 1 is connected to the security television camera 2, the microphone 18, and the transmitter 3. The transmitter 3 is for radiating the VHF radio wave E ₁ to the receiver 21 of the relay device 20 which is plugged into the domestic outlet 43.

The human body detecting element 1 includes a pyroelectric infrared sensor for detecting infrared rays radiated from the human body based on the temperature of the human body, or ultrasonic waves emitted toward a person and reflected ultrasonic waves reflected from the person. An ultrasonic sensor for detecting is used. The security television camera 2 is, for example, a CCD camera (semiconductor camera), and the microphone 18 is capable of collecting even a small noise.

As shown in FIG. 3, the transmitter 3 is driven by the receiving circuit 6 to which the detection signal S ₁ from the human body detecting element 1 and the receiving signal S ₂ from the receiving circuit 6 are input. Timer 7, an alarm speaker 8 driven by the timer 7, a VHF transmission circuit 9 to which the video signal S ₃ from the security television camera 2 and the audio signal S ₁₃ from the microphone 18 are input, and a VHF transmission circuit 9 V from
And a wave transmitter 10 that radiates the VHF radio wave E ₁ by placing the HF signal S ₄ on a carrier wave. The transmitter 3 is connected to an AC power source via an AC / DC converter 11 that converts AC power into DC power.

[0010] receiving circuit 6 is a comparator for comparing a predetermined reference voltage detection signals S ₁ from the human body detection device 1, and outputs the received signal S ₂ when a match (not shown)
It has. In addition, the receiving circuit 6 is the security TV camera 2
And a power switch (not shown) connected to the microphone 18 and supplying DC power for driving the security television camera 2 and the microphone 18.
The power switch supplies power to the security television camera 2 and the microphone 18 when the reception signal S ₂ from the reception circuit 6 is input.

When the video signal S ₃ from the security television camera 2 and the audio signal S ₁₃ from the microphone 18 are input to the VHF transmitting circuit 9, the VHF transmitting circuit 9 converts the video signal S ₃ and the audio signal S ₁₃ into a VHF signal S ₄ having a predetermined frequency. Is to be superimposed on. As shown in FIG. 2, the relay device 20 includes a wireless reception circuit 23, a VHF / UHF converter 24, and a wireless transmission circuit 2.
5, the AC / DC converter 26 and the plug 27.

The radio receiving circuit 23 includes a wave receiver 21 for receiving the VHF radio wave E ₁ radiated from the transmitter 3, and a VHF / UHF converter 24 is connected to the output side of the radio receiving circuit 23. VHF / UHF converter 24
Outputs the VHF signal S ₅ output from the wireless reception circuit 23 to the U
The signal is converted into the HF signal S ₆ . This VHF / UH
The F converter 24 is connected to the wireless transmission circuit 25 including the wave transmitter 22. The wave transmitter 22 is a wireless transmission circuit 25.
The UHF signal S ₆ output from the
It is composed of an antenna that outputs radio waves E ₂ or a coupler such as a coil.

Further, the casing 28 of the relay device 20 is integrally provided with a plug 27 which is a power source. As a result, in the room where the home television receiver 4 is placed, it can be plugged into the domestic outlet 43 without disturbing. An AC / DC converter 26, which is a power supply unit, is connected to the plug 27. This AC
/ DC converter 26 to receiving circuit 23, VHF / UH
DC power is supplied to each of the F converter 24 and the wireless transmission circuit 25.

An indoor UHF antenna 29 for receiving the UHF radio wave E ₂ transmitted from the relay device 20 is connected to the home television receiver 4. As a result, the video and audio from the security television camera 2 and the microphone 18 can be reproduced on the UHF channel of the home television receiver 4. The wireless reception circuit 23 and the wireless transmission circuit 25 may be connected so that the VHF signal S ₄ can be directly output to the wireless transmission circuit 25.

The operation of the security television camera system to which the relay device 20 having the above structure is applied will be described below. When a person approaches a doorway of a house in which the human body detecting element 1, the security television camera 2 and the microphone 18 are installed, the human body detecting element 1 detects the person and inputs the detection signal S ₁ to the receiving circuit 6 of the transmitter 3. . The reception circuit 6 inputs the reception signal S ₂ to the timer 7 based on the detection signal S ₁ . The timer 7 is driven by the received signal S _{2 and} causes the alarm sound speaker 8 to ring. The alarm sound speaker 8
The ringing time of can be freely set by the timer 7. Further, the receiving circuit 6 turns on the built-in power switch in response to the received signal S ₂ , so that power is supplied to the security television camera 2 and the microphone 18.

When DC power is supplied to the security TV camera 2 and the microphone 18, the security TV camera 2
To the video signal S ₃ and the microphone 18 to the audio signal S ₁₃
There are input to the VHF oscillator circuit 9, respectively, in this VHF oscillator circuit 9 superimposes the video signal S ₃ and the audio signal S ₁₃ to the VHF signal S ₄ of a predetermined frequency, transmitters put the VHF signal S ₄ to the carrier Emit VHF radio wave E ₁ from 10.

[0017] receives the VHF radio wave E ₁ receivers 21 of the relay apparatus 20, and outputs the VHF radio wave E ₁ in the AC power to the wireless receiver circuit 23. The wireless reception circuit 23 outputs the VHF signal S ₅ to the VHF / UHF converter 24 based on this AC power. VHF / UHF converter 24
Converts the VHF signal S ₅ into a UHF signal S ₆ and outputs the UHF signal S ₆ to the wireless transmission circuit 25. Radio transmitting circuit 25 outputs a UHF signal S ₆ to the transmitters 22, transmitters 22 emits a UHF radio wave E ₂ put the UHF signal S ₆ to the carrier.
At this time, since the alarm sound speaker 8 of the transmitter 3 is ringing, a person in the room turns on the power of the home television receiver 4, so that the radiated UHF radio wave E ₂ is emitted to the indoor UHF.
The signal is received by the antenna 29 and input to the home television receiver 4. Then, if the channel is switched to a predetermined UHF channel, the image taken by the security television camera 2 can be displayed on the home television receiver 4, and the sound collected by the microphone 18 can be reproduced.

[0018]

As described above, according to the relay device for the crime prevention television camera / home television receiver of the present invention,
V emitted from the transmitter connected to the security TV camera
HF radio waves can be received wirelessly, VHF radio waves can be converted into UHF radio waves, and the UHF radio waves can be radiated to the indoor antenna connected to the home-use television receiver, so that the wiring of the device can be simplified. This facilitates installation work for the crime prevention TV camera system.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a security TV camera system to which a relay device for a security TV camera / home TV receiver according to the present invention is applied.

FIG. 2 is a block diagram showing an embodiment of a relay device for a security TV camera / home TV receiver of the present invention.

3 is a block diagram of a transmitter used in the security television camera system of FIG.

FIG. 4 is an explanatory diagram showing a conventional crime prevention television camera system.

[Explanation of symbols]

2 ... Security TV camera 3 ... Transmitter 4 ... Home TV receiver 18 ... Microphone 20 ... Repeater 23 ... Wireless receiver circuit 24 ... VHF / UHF converter 25 ... Wireless transmitter circuit 26 ... AC / DC converter (power supply unit) 27 … Plug (power supply) 28… Housing 29… Indoor UHF antenna S ₆ … UHF signal E ₁ … VHF radio wave E ₂ … UHF radio wave

Claims (2)

[Claims] 1. A relay device for displaying a subject imaged by a crime prevention television camera installed outside a house on a home television receiver, which is radiated from a transmitter connected to the crime prevention television camera. A radio receiving circuit for receiving the VHF radio wave, and a VHF / UHF converter for converting the VHF radio wave received by the radio receiving circuit into a UHF signal,
The UH output from the VHF / UHF converter
A wireless transmission circuit that puts an F signal on a carrier wave and outputs it as UHF radio waves to an indoor antenna connected to the home television receiver, and a power supply unit that supplies power to the reception circuit, the VHF / UHF converter, and the wireless transmission circuit. A security television camera / household television image receiving device, characterized in that the power supply unit comprises a plug for plugging into a household outlet and an AC / DC converter for converting AC power from the plug into DC power. Relay device. 2. The plug is the wireless receiving circuit, the VH
F / UHF converter, the wireless transmission circuit, and the A
The relay device for a crime prevention television camera / home television receiver according to claim 1, wherein the relay device is integrated with a casing that covers the C / DC converter.