JP2672166B2 - TV door phone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a television capable of confirming a visitor's face by capturing an image of the visitor's face, which is announced by a doorphone handset at the entrance, with a camera and displaying it on a CRT. It is about doorphones.

[Prior Art] FIG. 6 is a block diagram showing a configuration of a conventional TV door phone (1). The TV door phone (1) is a master unit (2).
And a child device (3), and a parent device (2) and a child device (3)
And are connected by a two-wire transmission line (4).

The master unit (2) is provided indoors and includes a video interface circuit (5) connected to the transmitter (4), a modulation / demodulation circuit (6) and a power supply circuit (7). A CRT (8) as a display and a control circuit (9) are connected to 5).

A control circuit (9) and a handset (10) are connected to the modulation / demodulation circuit (6), and an operation switch circuit (11) for switching when a plurality of slave units are connected to the control circuit (9). ) Is connected.

Furthermore, an AC adapter (12) is connected to the power supply circuit (7), and power is supplied to the master unit (2) by connecting the AC adapter (12) to a commercial AC100V power supply. .

The slave unit (3) includes a modulation / demodulation circuit (13) and a power supply circuit (14) arranged at the entrance and connected to the transmission path (4). The modulation / demodulation circuit (13) includes a camera signal processing unit. The circuit (15), speaker (16), microphone (17) and call button (18) are connected.

The camera signal processing circuit (15) has an image pickup circuit (19).
And a camera (21) including a lens (20) is connected.

When actually manufacturing a TV doorphone, the master unit (2) has a structure as shown in FIG. 7 and the slave unit (3) has a structure as shown in FIG.

 Next, the operation will be described.

When the visitor pushes the call button (18) of the slave unit (3) placed at the entrance, the ON signal of the call button (18) is modulated / demodulated circuit (13), transmission line (4) and modulator / demodulated circuit (6).
Is transmitted to the control circuit (9) of the parent device (2) via.

Then, the control circuit (9) that receives the ON signal of the call button (18) transfers the power from the power supply circuit (7) to the transmission line (4).
Is supplied to the power supply circuit (14) via the power supply circuit (7), and the power supply circuit (14) generates a constant voltage required in the slave unit (3) circuit and supplies the constant voltage to each circuit. , This activates the camera (21) and audio system.

Then, the object projected through the lens (20) of the camera (21) onto the solid-state image sensor in the image pickup circuit (19) is
The image pickup circuit (19) converts it into a video signal (100), and the video signal (100) is CRT by the camera signal processing circuit (15).
Various kinds of signal processing are performed so as to be appropriately displayed on (8), and the signal is transmitted to the transmission line (4) (see FIGS. 6 and 9).

Further, the video signal is extracted from the transmission path (4) by the video interface circuit (5) of the master unit (2) and the video is displayed on the CRT (8).

Also, the voice signal collected by the microphone (17) of the slave unit (3) is modulated by the modulation / demodulation circuit (13), and is transmitted to the transmission line (4).
And is output to the master unit (2) through the (see FIG. 6 and FIG. 9).

Then, the voice signal is demodulated by the modulation / demodulation circuit (6), and the voice is reproduced from the speaker of the handset (10).

On the other hand, the sound collected from the microphone of the handset (10) is
The modulation / demodulation circuit (6) modulates to a carrier frequency different from the carrier frequency used when a voice signal is sent from the slave unit (3) to the master unit (2), and outputs it to the slave unit (3) through the transmission path (4). (See FIGS. 6 and 9).

Then, in the slave unit (3), the audio signal is demodulated by the modulation / demodulation circuit (13), and audio is reproduced from the speaker (16).

[Problems to be Solved by the Invention] Since the conventional TV intercom is configured as described above, the orientation of the camera is set when the slave unit is installed, and the subject moves outside the frame range of the camera. If
There was a problem that the subject disappeared.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a TV door phone in which the orientation of the camera can be changed while viewing the screen of the CRT from the master side.

[Means for Solving the Problem] The present invention connects an intercom slave including a camera, a microphone and a speaker, an intercom master including a display, a microphone and a speaker, and the intercom slave and the intercom master. In a TV door phone having a two-wire connection cable, an input unit for setting the direction of the camera of the door phone slave unit to one of up, down, left and right in the door phone master unit,
Control signal generating means for generating a coded control signal based on the setting inputted from the input means, and frequency-modulating the control signal generated by the control signal generating means and outputting the frequency-modulated control signal to the intercom slave unit through the connection cable. Drive means for moving the camera up and down in the intercom slave, frequency demodulation means for frequency demodulating a control signal output through the connection cable, and the frequency demodulation means. Control signal decoding means for decoding the control signal demodulated by the means, and drive control means for controlling the driving means based on the control signal decoded by the control signal decoding means to move the camera vertically and horizontally. , Is provided.

[Operation] The TV doorphone according to the present invention displays an image taken by the camera of the doorphone slave unit on the display unit of the doorphone master unit and reproduces the sound picked up by the microphone of the doorphone slave unit by the speaker of the doorphone master unit. The voice picked up by the microphone of the master unit is reproduced by the speaker of the intercom slave unit, and a control signal for controlling the orientation of the camera of the intercom slave unit is transmitted from the angle control signal transmitting circuit to the intercom slave unit by the signal from the input key. The drive means is controlled by the camera angle control circuit in response to a signal from the angle control signal transmission circuit, and the camera is oriented at a desired angle.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the TV intercom (1) has a master unit (2) and a slave unit (3), and the master unit (2) and the slave unit (3) are of a two-wire type. They are connected by a transmission line (4).

The master unit (2) is placed indoors and sends out a control signal for controlling the orientation of the video interface circuit (5), the modulation / demodulation circuit (6), and the camera of the slave unit, which are connected to the transmission path (4). An angle control signal transmission circuit (22) and a power supply circuit (7) are provided, and a CRT (8) as a display and a control circuit (9) are connected to the video interface circuit (5).

A control circuit (9) and a handset (10) are connected to the modulation / demodulation circuit (6), and an operation switch circuit (11) for switching when a plurality of slave units are connected to the control circuit (9). ) And an angle control signal sending circuit (22) are connected.

Further, an AC adapter (12) is connected to the power supply circuit (7), and electric power is supplied to the master unit (2) by connecting the AC adapter (12) to a commercial power supply.

The slave unit (3) is a camera which is arranged at the entrance and changes the direction of the camera (21) by signals from the modulation / demodulation circuit (13) and the angle control signal transmission circuit (22) connected to the transmission path (4). An angle control circuit (23) and a power supply circuit (14) are provided, and a camera signal processing circuit (15), a speaker (16), a microphone (17) and a call button (18) are connected to the modulation / demodulation circuit (13). Has been done.

The camera signal processing circuit (15) has an image pickup circuit (19).
And a movably supported camera (21) including a lens (20).

As shown in detail in FIG. 1, the angle control signal transmission circuit (22) is a motor drive switch (24) consisting of four switches for operating the camera (21) of the slave unit (3) vertically and horizontally. , It consists of a control signal encoder (25) and a 6.5MHz FM modulation circuit (26).

The camera angle control circuit (23) is composed of a 6.5 MHz FM demodulation circuit (27), a control signal decoder (28) and a motor drive circuit (29). The motor drive circuit (29) serves as a drive means. A left and right motor (30) that moves the camera (21) in the left and right directions and a vertical motor (31) that moves the camera (21) in the up and down directions are connected.

When actually manufacturing a TV door phone, the master unit (2) has a structure as shown in FIG. 3 and the slave unit (3) has a structure as shown in FIG.

 Next, the operation of the present embodiment will be described.

When the visitor pushes the call button (18) of the slave unit (3) placed at the entrance, the ON signal of the call button (18) is modulated / demodulated circuit (13), transmission line (4) and modulator / demodulated circuit (6).
Is transmitted to the control circuit (9) of the parent device (2) via.

Then, the control circuit (9) that receives the ON signal of the call button (18) transfers the power from the power supply circuit (7) to the transmission line (4).
Is supplied to the power supply circuit (14) via the power supply circuit (7), and the power supply circuit (14) generates a constant voltage required in the slave unit (3) circuit and supplies the constant voltage to each circuit. , This activates the camera (21) and audio system.

Then, the object projected through the lens (20) of the camera (21) onto the solid-state image sensor in the image pickup circuit (19) is
The image pickup circuit (19) converts it into a video signal (100), and the video signal (100) is CRT by the camera signal processing circuit (15).
Various kinds of signal processing are performed so as to be appropriately displayed on (8), and the signal is sent to the transmission line (4) (see FIGS. 2 and 5).

Further, the video signal is extracted from the transmission path (4) by the video interface circuit (5) of the master unit (2) and the video is displayed on the CRT (8).

Also, the voice signal collected by the microphone (17) of the slave unit (3) is modulated by the modulation / demodulation circuit (13), and is transmitted to the transmission line (4).
It is output to the master unit (2) through the (see FIG. 2 and FIG. 5).

Then, the voice signal is demodulated by the modulation / demodulation circuit (6), and the voice is reproduced from the speaker of the handset (10).

On the other hand, the sound collected from the microphone of the handset (10) is
The modulation / demodulation circuit (6) modulates to a carrier frequency different from the carrier frequency when a voice signal is transmitted from the slave unit (3) to the master unit (2), and outputs to the slave unit (3) through the transmitter (4). (See FIGS. 2 and 5).

Then, in the slave unit (3), the audio signal is demodulated by the modulation / demodulation circuit (13), and audio is generated from the speaker (16).

Also, when the visitor moves out of the frame of the camera (21) and the visitor disappears from the CRT (8), the family member responding by the base unit (2) is the CRT of the base unit (2).
Motor drive switch (24) while watching the image in (8)
The camera (21) is operated to move in the desired directions of up, down, left and right.

And four switches of motor drive switch (24)
The ON / OFF signal is pulsed by the control signal encoder (25) to become the control signal A, which is FM-modulated by the 6.5MHz FM modulation circuit (26) to become the 6.5MHz FM modulation signal B and the slave unit (3).
(See FIGS. 1 and 5).

Then, 6.5MHz FM modulated signal B is 6.5MHz of the handset (3).
The FM demodulation circuit (27) performs FM demodulation to become an FM demodulation signal C. The FM demodulation signal C is selected by the control signal decoder (28) to become a motor drive switch signal D. The motor drive switch signal D causes the left and right motors (30). Alternatively, the up-down motor (31) rotates in a desired direction to change the direction of the camera (21) and image the visitor.

This allows the family member to confirm the visitor's face.

In the above-described embodiment, the camera (21) is configured to change its orientation, but the present invention is not limited to this, and the same configuration can be achieved by changing the orientation of the entire slave unit (3).

[Effects of the Invention] As described above, according to the present invention, the control signal for controlling the orientation of the camera of the intercom slave is transmitted to the intercom slave by the signal from the input key of the master. However, the drive means is controlled by the camera angle control circuit in response to the signal from the angle control signal transmission circuit, and the camera direction can be changed from the master unit to the desired angle. Even if the subject moves, the camera can be turned to the direction in which the subject has moved, and the subject can always be displayed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an angle control signal transmission circuit and a camera angle control circuit according to an embodiment of the present invention and signal waveforms at respective portions, and FIG. 2 is a configuration of a TV doorphone according to an embodiment of the present invention. FIG. 3 is a block diagram showing the configuration in the case of actually manufacturing the master unit of the present invention, and FIG. 4 is a block diagram showing the configuration in the case of actually manufacturing the slave unit of the present invention. FIG. 6 is a frequency distribution diagram of a TV intercom according to an embodiment of the present invention, FIG. 6 is a block diagram showing a configuration of a conventional TV intercom, and FIG. 7 is a block showing a configuration when actually manufacturing a conventional base unit. FIG. 8 is a block diagram showing the structure of a conventional handset when it is actually manufactured, and FIG. 9 is a frequency distribution diagram of a conventional TV doorphone. In the figure, (1) is a TV intercom, (2) is a base unit, and (3)
Is a cordless handset, (4) is a connection cable, (8) is an indicator, (1
0) is a speaker / microphone, (16) is a speaker, (17) is a microphone, (21) is a camera, (22) is an angle control signal transmission circuit, (23) is a camera angle control circuit, and (24) is an input key. ,
(30, 31) is a drive means. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A doorphone slave unit including a camera, a microphone and a speaker, a doorphone master unit including a display, a microphone and a speaker, and a two-wire type connection cable connecting the doorphone slave unit and the doorphone master unit. In a TV intercom having, an input unit for setting the orientation of the camera of the intercom slave to any one of up, down, left and right, and a control signal coded based on the setting input from the input unit to the intercom base unit. A control signal generating unit for generating the frequency, and a frequency modulating unit for frequency-modulating the control signal generated by the control signal generating unit and outputting the frequency-controlled control signal to the intercom slave unit through the connection cable. Drive means for moving the direction of the control signal up and down, left and right, and frequency demodulation means for frequency demodulating the control signal output through the connection cable, Control signal decoding means for decoding the control signal demodulated by the frequency demodulation means, and drive control for controlling the driving means based on the control signal decoded by the control signal decoding means to move the camera vertically and horizontally. A television door phone, characterized by comprising: