JPH03124152A - Interphone device - Google Patents

Abstract

PURPOSE:To pick up a video image from an intended position without being notified by a visitor by separating a camera unit from a slave set independently. CONSTITUTION:A camera unit 11 is provided separately from a slave set 1 at a position such as above a gatedoor or at a position not remarkable to the gatedoor. When a call button 17 is depressed by a visitor, a call tone is generated. Simultaneously, a power voltage in a power supply circuit 28 is boosted from a standby voltage into an operating voltage and the boosted power supply voltage is supplied to a monitor TV 22 and a camera unit 11 of the slave set 1 via signal lines 3, 4. A video signal outputted from the camera unit 11 is fed to a slave set 3 through the signal line 4, modulated by a modulation circuit 12 and sent to a master set 2 through the signal line 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an intercom device including a base unit and a slave unit connected by two wires.

BACKGROUND OF THE INVENTION FIG. 3 shows the structure of a conventional two-wire monitor television intercom device. In Fig. 3, 1 is a slave unit, 2 is a master unit, and the slave unit 1 and base unit 2 are connected to a two-wire signal line 3.
connected with. 11 is a camera unit; 12
13 is a modulation circuit, 13 is a telephone call circuit, 14 is a microphone, 15 is a speaker, 16 is a calling signal generating circuit, and 17 is a calling button.

21 is a demodulation circuit, 22 is a monitor television, 23 is a telephone communication circuit, 24 is a handset, 25 is a microphone, 26 is a speaker, 27 is a ringing tone generation circuit, and 28 is a power supply circuit.

Next, the operation of the above conventional example will be explained. In FIG. 3, when the call button 17 is pressed on the handset 1, the ring tone generating circuit 27 in the base unit 2 detects the signal and a ring tone is emitted, and the power supply circuit 28 changes the standby voltage to the operating voltage. This power supply voltage is boosted and supplied to the monitor television 22 and the camera unit 11 of the slave device 1 . A video signal output from the camera unit 11 is modulated by a modulation circuit 12, sent to the base unit 2 through a signal line 3, demodulated by a demodulation circuit 21, and the video is displayed on a monitor television 22. In addition, the audio signal collected by the microphone 14 of the handset 1 is transmitted from the call circuit 13 and the modulation circuit 12 to the demodulation circuit 21 of the base unit 2, and from the call circuit 23 to the handset 2 through the signal line 3.
The signal is sent to the No. 4 speaker 26. Also, handset 2
The audio signal from the microphone 25 of No. 4 is transferred directly from the baseband communication circuit 23 of base unit 2 to the communication circuit 1-3 of handset I.
The signal is transmitted to the speaker 15 through the .

In this way, even with the above-mentioned conventional two-wire intercom device with monitor TV, it is possible to talk while viewing the image of the visitor.

Problems to be Solved by the Invention However, in the conventional intercom device described above, since the camera unit 11 is integrated into the handset 1, the visitor is conscious of the presence of the camera, which may cause discomfort to the visitor. There's a problem. Furthermore, since the camera position is easily known, there is also the problem that the camera unit may be tampered with or destroyed. Furthermore, due to the installation location constraints, in which the visitor's voice cannot be collected sufficiently unless handset 1 is installed at about the height of the visitor's face, it is necessary to install the handset 1 at the height of the visitor's face. The problem was that I couldn't take enough pictures.

The present invention is intended to solve such conventional problems, and aims to provide an excellent intercom device that can take a video from a desired position without the visitor being aware of it.

Means for Solving the Problems In order to achieve the above object, the present invention is such that the camera unit is separated and independent from the handset.

Therefore, according to the present invention, by making the camera unit separate and independent from other communication systems of the handset, the camera unit can be installed in a position where visitors are not aware of it, and it is possible to comfortably interact with visitors. It has the effect of not only being able to make phone calls, but also being able to project images from the intended location.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, the same elements as in the conventional example shown in FIG. 3 are given the same reference numerals. 1 is a slave unit installed at the entrance, and 2 is a master unit installed in the residence. Handset 1 and base unit 2
is connected to by a two-wire signal line 3. Reference numeral 11 denotes a camera unit that outputs a standard video signal (NTSC signal), and is installed separately and independently from the handset 1 at an inconspicuous position, for example, above the entrance or toward the entrance. The camera unit 11 and the handset 1 are connected by two signal lines 4.

In the handset 1, 12 is a modulation circuit for superimposing and transmitting the video signal from the camera unit 11 and the audio signal from the telephone call circuit 13, and is composed of a 1-chip IC as shown in FIG. . 13 is a telephone call circuit for mixing and separating the audio signal from the microphone 14 and the audio signal to the speaker 15; and 16 is a calling signal generating circuit for generating a calling signal when the calling button 17 is pressed.

In the base unit 2, 21 is a demodulation circuit that separates the signal sent from the slave unit 1 into a video signal and an audio signal and demodulates the signal; 22
2 is a monitor television that receives a demodulated video signal and displays the image; 23 is a communication circuit that mixes and separates the audio signal from the microphone 25 of the handset 24 and the audio signal sent to the speaker 26; 27 is a ringing tone generation circuit; This is a power supply circuit.

Next, the operation of the above conventional example will be explained. In FIG. 1, when the call button 17 is pressed by a visitor, a call signal is sent from the call signal generation circuit 16 to the ring tone generation circuit 27 of the base unit 2, where a ring tone is generated.

At the same time, the power supply voltage is boosted from the standby voltage to the operating voltage in the power supply circuit 28, and this boosted power supply voltage is supplied to the monitor television 22 and the camera unit 11 of the handset 1 through the signal lines 3 and 4. The video signal output from the camera unit 11 is sent to the handset 3 through the signal line 4, modulated by the modulation circuit 12, and sent to the base unit 2 through the signal line 3. The video signal demodulated by the demodulation circuit 21 is output to the monitor television 22, and the image of the visitor is displayed on the screen of the monitor television 22. In addition, the visitor's voice collected by the microphone 14 of the handset 1 is converted into an audio signal and sent from the communication circuit 13 and the modulation circuit 12 to the base unit 2 through the signal line 3, and then to the demodulation circuit of the base unit 2. 21, the signal is sent from the communication circuit 23 to the speaker 26 of the handset 24. On the other hand, the resident's voice is collected by the microphone 25 of the handset 24 and converted into an audio signal, which is transmitted from the base unit 2's call circuit 23 to the handset 1's call circuit 13 while maintaining the baseband.
The signal is transmitted to the speaker 15 through the . Therefore, the resident can talk to the visitor while viewing the visitor's image on the monitor television 22.

In this way, according to the above embodiment, the camera unit) 11
Since the and handset 1 are separate and independent, each can be installed in any location, and the camera unit 11 can be installed in an inconspicuous position to capture the desired image without causing discomfort to visitors. can be photographed. In addition, since a standard video signal is output from the camera unit 11,
By connecting directly to the video input terminal of an ordinary television receiver using a coaxial cable, the visitor's image can be displayed on an ordinary television receiver.

Effects of the Invention As is clear from the above embodiments, the present invention separates the camera unit from the handset and makes it possible to project an intended image without being restricted by the installation position. It has the advantage that you can make calls without causing discomfort.Also, since the camera unit outputs a standard video signal, if you connect it directly to a general TV receiver, you can also make calls using a general TV receiver. This has the effect of allowing users to view images of other people.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an intercom device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a modulation circuit in the same device, and FIG. 3 is a schematic block diagram of a conventional intercom device. 1...Slave unit, 2...Base unit, 3.4...Signal line, 1
DESCRIPTION OF SYMBOLS 1... Camera unit, 12... Modulation circuit, 13.
...Telephone circuit, 14...Microphone, 15...Speaker, 16...Call signal generation circuit, 17...Call button, 21...Demodulation circuit, 22...Monitor television, 23
...Telephone circuit, 24...Handset, 25...
Microphone, 26...Speaker, 27...Ring tone generation circuit, 28...Power supply circuit.

Claims (1)

[Claims] an interphone base unit with a monitor television having a demodulation circuit that demodulates the superimposed video signal and audio signal; an interphone slave unit that is connected to the base unit via two wires and has a modulation circuit that superimposes the video signal and audio signal; An intercom device comprising: a camera unit that is provided separately and independently from the slave unit and sends a standard video signal to the slave unit through a signal line.