JPH0879735A - Video call equipment - Google Patents

Abstract

PURPOSE: To eliminate linkage control signal lines between an indoor host unit and plural extension monitors and to reduce the number of linkage control signal transmission terminals and linkage control signal reception terminals related to the linkage control signal lines. CONSTITUTION: The indoor host unit MQ1 is provided is provided with a call signal reception circuit 10 for receiving call signals transmitted from an entrance slave unit SQ1 with a camera with a call button 1c is pushed and a power supply circuit 11 for supplying power to the entrance slave unit with the camera. The extension monitors MQ2 -MQ5 each are provided with a carrier wave detection circuit 21 for detecting carrier waves included in video signals f1 and the power supply circuit 22 for supplying the power to extension television monitors when the carrier waves are detected in the carrier wave detection circuit. The indoor host unit and the extension monitors are provided with video signal demodulation circuits 2 and 19 for outputting the demodulated video signals to a television monitor and the extension television monitors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video call device,
In particular, the present invention relates to a video call device capable of eliminating the interlocking control signal line between the indoor master unit and a plurality of additional monitors and reducing the interlocking control signal transmitting terminal and interlocking control signal receiving terminal related to the interlocking control signal line.

[0002]

2. Description of the Related Art Conventionally, a video call device shown in FIG. 2 has been proposed. This video call device is a door-to-door unit SQ with a camera.
₁₁ , the indoor master device MQ ₁₁ and additional monitors MQ _{12 to} MQ ₁₅ (the number of additional monitors is 4), and the camera-equipped entrance slave device SQ ₁₁ and the indoor master device MQ ₁₁ are connected by a transmission line L _11. ing.

In addition, the indoor base unit MQ ₁₁ and the extension monitor MQ ₁₂
To MQ ₁₅ are connected to the communication cable L ₁₂ by the interlocking control signal line L ₁₃ . The camera-equipped front cordless handset SQ ₁₁ is provided with a camera eye 31, a speaker 32 a, a microphone 32 b, and a call button 33. The indoor master device MQ ₁₁ includes a video signal demodulation circuit 42, a television monitor 43, and a line interface 4
4. Multiplexing / separating circuit 45, audio signal demodulating circuit 46, audio signal modulating circuit 47, hook switch circuit 48, speaker 49a, microphone 49b, handset 49, ringing signal receiving circuit 50, power supply circuit 51, power supply switch circuit 51a ,
51b, interlocking control signal transmission circuit 54, speaker 5 for calling
An indoor master device CPU 55 to which 2 is connected is provided.

A transmission line terminal T to which the transmission line L ₁₁ is connected
Reference numeral ₁₁ is connected to the line interface 44, and the line interface 44 is connected to the video signal demodulation circuit 42 via the multiplexing / demultiplexing circuit 45. The video signal demodulation circuit 42 is connected to the television monitor 43, and the multiplexing / separation circuit 45 is used as the audio signal demodulation circuit 46 and the hook switch circuit 4.
8 is connected to the speaker 49a of the handset 49.

Further, the microphone 49b of the handset 49 is connected to the audio signal modulation circuit 47 via the hook switch circuit 48, and the audio signal modulation circuit 47 is connected to the multiplexing / demultiplexing circuit 45. The line interface 44 is connected to the calling signal receiving circuit 50, and the control output side of the calling signal receiving circuit 50 is connected to the indoor base unit CPU 55.

The output side of the power supply circuit 51 for supplying power to each circuit section is connected to the power supply switch circuits 51a and 51b, and the power supply side of the power supply switch circuit 51b is connected to the line interface 44. Further, the power supply side of the power switch circuit 51a is connected to the television monitor 43.

[0007] interlock control in signal transmission circuit 54 is provided transistor TR ₁ is connected with the interlock control signal sending terminal T ₁₂ collector through a resistor R ₁ of the transistor TR _1. The emitter is connected to the reference potential point, the base is connected to the indoor base unit CPU55 through a resistor R _2. Further, the base is connected to the other end of the resistor R ₃ whose one end is connected to the reference potential point.

Power supply switch circuits 51a and 51b are connected to the control output side of the indoor master device CPU55, and a control line is connected between the hook switch circuit 48 and the indoor master device CPU55. The extension monitors MQ _{12 to} MQ ₁₅ are composed of a line interface 57, a video signal BPF 58, a video signal demodulation circuit 59, an extension television monitor 60, an interlocking control signal receiving circuit 61, a power supply circuit 62, a power supply switch circuit 62 a, and an extension monitor CPU 65. , Track interface 5
Reference numeral 7 denotes a video signal BPF 58 and a video signal demodulation circuit 59.
It is connected to the extension television monitor 60 via.

The output side of the power supply circuit 62 is connected to the extension television monitor 60 via the power supply switch circuit 62a, and the control input side of the power supply switch circuit 62a is connected to the extension monitor CPU 65. Interlocking control signal receiving circuit 6
1 is provided with a transistor TR ₂
The base of R ₂ is the interlocking control signal receiving terminal T via the resistor R _4.
Connected with ₁₃ .

The emitter is connected to the power source + B, and the power source + B is connected to the base via the resistor R ₅ . Furthermore, the collector has a resistor R whose one end is connected to the reference potential point.
_It is connected to the extension monitor CPU 65 together with the other end of ₆ . With such a video call device, the front door subunit S with camera
When the call button 33 of Q ₁₁ is pressed, the call signal is transmitted to the transmission line L ₁₁
Is transmitted to the transmission line terminal T ₁₁ of the indoor master device MQ ₁₁ via the.

The call signal input to the transmission line terminal T ₁₁ is sent to the call signal receiving circuit 50 via the line interface 44.
Sent to The call signal receiving circuit 50 is the indoor base unit CPU
When the call signal is input to 55, the call speaker 52 sounds under the control of the indoor base unit CPU 55.
At the same time, the indoor base unit CPU 55 controls the power switch circuit 51
a, 51b are controlled, the power supply switch circuit 51b is provided to the extension television monitor 60 via the power supply switch circuit 51b and the line interface 44 to the front door subunit SQ ₁₁ with camera.
Power is supplied from the power supply circuit 51 via a.

[0012] When the power to the camera with the entrance door station SQ ₁₁ is supplied, the video signal generated by the camera eye 31 of the camera with the entrance door station SQ ₁₁ is via the transmission path L _11, all of the transmission path It is sent to the terminal T ₁₁ . Further, when the indoor parent device CPU 55 controls the transistor TR ₁ of the interlocking control signal transmission circuit 54, the transistor TR ₁ is turned on.

When the transistor TR ₁ is turned on, the interlocking control signal transmission terminal T ₁₂ to which the resistor R ₁ is connected becomes L level. When the interlocking control signal sending terminal T ₁₂ becomes L level, the interlocking control signal line L ₁₃ becomes L level, and all the interlocking control signal receiving terminals T ₁₃ become L level. When the interlocking control signal receiving terminal T ₁₃ becomes L level, the extension monitor MQ ₁₂ ~
The transistor TR _{2 of} the interlocking control signal receiving circuit 61 provided in the MQ ₁₅ operates via the resistors R ₅ and R _4, and notifies the extension monitor CPU 65 that the interlocking control signal has been received. When the additional monitor CPU 65 knows that the interlocking control signal has been received, it controls the power switch circuit 62a to supply power to the additional television monitor 60.

On the other hand, since the video signal generated by the camera eye 31 of the camera-equipped front cordless handset SQ ₁₁ is input to the transmission line terminal T ₁₁ , this video signal is transmitted to the line interface 44, the multiplex / separation circuit 45, To the TV monitor 43 via the video signal demodulation circuit 42, and to the line interface 5
7, the video signal BPF 58, and the video signal demodulation circuit 59 to the additional television monitor 60.

The video signal thus input to the transmission line terminal T ₁₁ is demodulated by the video signal demodulation circuits 42 and 59,
It is monitored by the television monitors 43 and 60. When the handset 49 is off-hook, the hook switch circuit 48 operates under the control of the indoor base unit CPU 55. Hook switch circuit 48
Is activated, the speaker 32 of the front door subunit SQ ₁₁ with camera
a and the microphone 32b, and the speaker 49a and the microphone 49b of the handset 49 form a communication path, and the voice signal from the speaker 49a and the microphone 49b of the handset 49 is modulated by the voice signal demodulation circuit 46 and the voice signal modulation circuit 47. To be done.

When the handset 49 is on-hook, the hook switch circuit 48 and the power supply switch circuits 51a and 51b are restored by the control of the indoor base unit CPU 55, and the standby state is set.
Further, the transistor TR ₁ of the interlocking control signal transmission circuit 54 is turned off by the control of the indoor base unit CPU 55, the interlocking control signal transmitting terminal T ₁₂ and the interlocking control signal line L ₁₃ become H level, and the extension monitors MQ _{12 to} MQ. ₁₅ power switch circuit 62
a is restored under the control of the expansion monitor CPU 65 and enters the standby state.

[0017]

In such a video call device, the indoor base unit MQ ₁₁ and the extension monitors MQ _{12 to} MQ _{15 are used.}
Apart from the transmission line L ₁₂ between each other, since they must be connected by interlocking control signal line L _13, interlock control signal sending terminal T ₁₂ according to the interlock control signal line L _13, interlock control signal receiving terminal T
There is a problem that the wiring man-hours of ₁₃ increase and the workability is poor.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and eliminates the interlocking control signal line between the indoor master unit and the extension monitor to provide the interlocking control signal related to the interlocking control signal line. It is an object of the present invention to reduce the number of wiring steps for the sending terminal and the interlocking control signal receiving terminal, and to provide a video communication device with excellent workability.

[0019]

In order to achieve this object, a video call apparatus according to the present invention monitors a video signal generated by a camera-equipped door subunit equipped with a camera eye and a call button. An indoor master unit provided with a television monitor, and an additional monitor provided with an additional television monitor connected to the indoor master unit through a communication transmission line to monitor a video signal,
The indoor base unit is equipped with a ringing signal receiving circuit that receives a ringing signal sent from the camera-equipped child subunit when the call button is pressed, and a power supply circuit that supplies power to the camera-equipped child subunit, and an additional monitor Is equipped with a carrier wave detection circuit that detects the carrier wave included in the video signal, and a power supply circuit that supplies power to the additional TV monitor when the carrier wave is detected by the carrier wave detection circuit. And a video signal demodulation circuit for outputting the demodulated video signal to the additional television monitor.

[0020]

When the call button is pressed, the call signal receiving circuit provided in the indoor base unit receives the call signal. When the call signal receiving circuit receives the call signal, power is supplied from the power supply circuit of the indoor master unit to the entrance child device with camera.

Further, the carrier wave detection circuit provided in the additional monitor detects the carrier wave contained in the video signal. When the carrier wave detection circuit detects a carrier wave, power is supplied from the power supply circuit to the additional television monitor. When power is supplied from the power supply circuit to the additional television monitor, the video signal demodulated by the video signal demodulating circuit can be monitored by the television monitor and the additional television monitor.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A video call device according to the present invention will be described below in detail with reference to FIG. As shown in FIG. 1, the video call device according to the present invention includes a camera-equipped front-door subunit SQ ₁ provided with a camera eye 1 and a call button 1c, and a television monitor 3 for monitoring a video signal f ₁ generated by the camera eye. the indoor base unit MQ ₁ provided with, connected by communication transmission path L ₂ and the indoor base unit, and a additional monitor MQ ₂ ~MQ ₅ provided with additional television monitor 20 for monitoring the video signal, the indoor base unit Is equipped with a ringing signal receiving circuit 10 for receiving a ringing signal sent from the camera-equipped front door device when the call button is pressed, and a power supply circuit 11 for supplying power to the camera-equipped front door device. Includes a carrier wave detection circuit 21 that detects a carrier wave included in the video signal, and a power supply circuit 22 that supplies power to the additional television monitor when the carrier wave is detected by the carrier wave detection circuit.
The indoor master unit and the extension monitor are provided with video signal demodulation circuits 2 and 19 for outputting the demodulated video signal to the television monitor and the extension television monitor.

The entrance subunit SQ ₁ with a camera is provided with a camera eye 1, a speaker 1a, a microphone 1b and a call button 1c. The front door subunit SQ ₁ with camera and the indoor master unit MQ ₁ are connected by the transmission line L ₁ , and the indoor master unit MQ ₁ and the extension monitor MQ _{2 are connected.}
To MQ ₅ (the number of additional monitors is 4 for the sake of explanation), the transmission line terminal T ₁ and the communication transmission line terminal T are connected via the communication transmission line L _2.
Connected with ₂ .

The indoor main unit MQ ₁ includes a video signal demodulation circuit 2, a television monitor 3, a line interface 4, a multiplex,
Separation circuit 5, audio signal demodulation circuit 6, audio signal modulation circuit 7, hook switch circuit 8, speaker 9a, microphone 9b
Handset 9, call signal receiving circuit 10, power supply circuit 1
1, an indoor main unit CPU 15 to which the power switch circuits 11a and 11b and the calling speaker 12 are connected is provided.

Transmission line terminal T ₁ to which the transmission line L ₁ is connected
Is connected to the line interface 4, and the line interface 4 is connected to the video signal demodulation circuit 2 via the multiplexing / demultiplexing circuit 5. The video signal demodulation circuit 2 is connected to the television monitor 3, and the multiplexing / separation circuit 5 is connected to the handset 9 via the audio signal demodulation circuit 6 and the hook switch circuit 8.
Is connected to the speaker 9a.

Further, the microphone 9b of the handset 9 is connected to the audio signal modulation circuit 7 via the hook switch circuit 8, and the audio signal modulation circuit 7 is connected to the multiplexing / demultiplexing circuit 5. The line interface 4 is connected to the calling signal receiving circuit 10, and the control output side of the calling signal receiving circuit 10 is connected to the indoor master CPU 15. The outputs of the power supply circuit 11 that supplies power to the respective circuit parts are the power supply switch circuits 11a and 1a.
1b, and the power supply side of the power switch circuit 11b is connected to the line interface 4.

Further, the power supply of the power switch circuit 11a
The side is connected to the television monitor 3. Extension monitor MQ
₂~ MQ_FiveIs the line interface 17, BP for video signals
F18, video signal demodulation circuit 19, additional television monitor 2
0, power supply circuit 22, power supply switch circuit 22a, carrier wave detection
Communication circuit with output circuit 21 and additional monitor CPU 25
L ₂Communication transmission line terminal T connected to₂Is the railway interface
It is connected to the base 17.

The line interface 17 is also connected to the extension television monitor 20 via the video signal BPF 18 and the video signal demodulation circuit 19. The output side of the power supply circuit 22 is connected to the extension television monitor 20 via the power supply switch circuit 22a, and the control input side of the power supply switch circuit 22a is connected to the extension monitor CPU 25.

Further, the video signal BPF 18 is connected to the control input side of the extension monitor CPU 25 via the carrier wave detection circuit 21. In such a video call device, when the call button 1c of the entrance device with camera SQ ₁ is pressed, a call signal is sent to the transmission line terminal T ₁ of the indoor master device MQ ₁ through the transmission line L ₁ .

The calling signal input to the transmission line terminal T ₁ is sent to the calling signal receiving circuit 10 via the line interface 4. The call signal receiving circuit 10 is the indoor base unit CPU1.
When the call signal is input to 5, the indoor speaker CPU 15 controls the call speaker 12 to ring. At the same time, the indoor parent device CPU 15 controls the power switch circuit 11b and the power switch circuit 11a, and the entrance slave unit with camera S
Power is supplied to Q ₁ via the power switch circuit 11b and the line interface 4, and to the television monitor 3 via the power switch circuit 11a.

[0031] When the power to the camera with the entrance door station SQ ₁ is supplied, the video signal f ₁ generated by the camera eye 1 of the camera with the entrance door station SQ ₁ transmission line L ₁ and all contact transmission path L ₂
Via the transmission line terminal T ₁ and the communication transmission line terminal T ₂ . The video signal f ₁ sent to the transmission line terminal T ₁ can be monitored by the television monitor 3 via the line interface 4, the multiplexing / demultiplexing circuit 5, and the video signal demodulating circuit 2.

Further, the video signal f ₁ sent to the communication transmission line terminal T ₂ via the communication transmission line L ₂ is the extension monitor MQ ₂
~ MQ ₅ line interface 17 and video signal BP
It is sent to the carrier wave detection circuit 21 and the video signal demodulation circuit 19 via F18, and the video signal demodulation circuit 19 demodulates the input video signal and sends it to the extension television monitor 20. The carrier wave detection circuit 21 detects the carrier wave of the video signal f ₁ and notifies the additional monitor CPU 25 that the carrier wave has been detected.

When the additional monitor CPU 25 knows that the carrier wave has been detected, it controls the power switch circuit 22a to supply power to the additional television monitor 20. When power is supplied to the additional television monitor 20, the video signal demodulated by the video signal demodulation circuit 19 can be monitored by the additional television monitor 20. When the handset 9 is off-hook, the indoor base unit CPU1
The hook switch circuit 8 operates under the control of 5.

When the hook switch circuit 8 operates, the speaker 1a and the microphone 1b of the camera-equipped front cordless handset SQ ₁ ,
A communication path is formed by the speaker 9a and the microphone 9b of the handset 9. The voice signal from the speaker 9a and the microphone 9b of the handset 9 is multiplexed and modulated by the voice signal demodulation circuit 6 and the voice signal modulation circuit 7.

When the handset 9 is hooked on hook, the hook switch circuit 8 and the power supply switch circuits 11a and 11b are restored by the control of the indoor master unit CPU 15, and the standby state is set. Further, when the power switch circuit 11b is restored, since the carrier which has been detected by the carrier detection circuit 21 of the additional monitor MQ ₂ ~MQ ₅ is stopped, the power switch circuit 22a is restored in the control of the additional monitor CPU 25, and a standby state Become.

[0036]

As is apparent from the above description, according to the video call apparatus of the present invention, a door with a camera provided with a camera eye and a call button, and a television for monitoring a video signal generated by the camera eye. An indoor base unit with a monitor,
The indoor master unit has an additional monitor that is connected to the indoor master unit via a communication transmission line and has an additional TV monitor for monitoring video signals. The indoor master unit has a call sent from the front door with camera when the call button is pressed. It is equipped with a ringing signal receiving circuit that receives a signal and a power supply circuit that supplies power to the camera-equipped front door, and the extension monitor detects the carrier wave included in the video signal and the carrier wave detection circuit detects the carrier wave. Equipped with a power supply circuit that supplies power to the additional TV monitor when detected
Since the indoor master unit and the additional monitor are equipped with a TV monitor and a video signal demodulation circuit that outputs the demodulated video signal to the additional TV monitor, the interlocking control signal line between the indoor master unit and multiple additional monitors is deleted. However, it is possible to reduce the interlocking control signal transmitting terminal and the interlocking control signal receiving terminal related to the interlocking control signal line.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a video call device according to the present invention.

FIG. 2 is a block diagram of a conventional video call device.

[Explanation of symbols]

1 ... Camera eye 1c ... Call button 2, 19 ... Video signal demodulation circuit 3 Television monitor 10 Call signal reception Circuit 11 ・ ・ ・ ・ Power supply circuit 20 ・ ・ ・ ・ ・ Extension TV monitor 21 ・ ・ ・ ・ ・ ・ Carrier detection circuit 22 ・ ・ ・ ・ ・ ・ Power supply circuit MQ ₁・ ・ ・ ・ ・ Indoor master unit MQ _{2 to} MQ ₅ ...... Expansion monitor SQ ₁・ ・ ・ ・ ・ ・ Front door with camera f ₁・ ・ ・ ・ ・ ・ Video signal L ₂・ ・ ・ ・ ・ Communication transmission line

Claims (1)

[Claims] 1. A camera eye (1) and a call button (1c) are provided.
Entrance cordless handset with digital camera (SQ₁) And the camera eye
Generated video signal (f₁) Monitor tv monitor
Indoor base unit with (3) (MQ₁) And the indoor base unit
Communication transmission line (L₂) To monitor the video signal
Expansion monitor (MQ
₂~ MQ_Five) And the call button is pressed on the indoor base unit.
Call sent from the front door with camera when dropped
A ringing signal receiving circuit (10) for receiving a signal, and the turtle
Equipped with a power supply circuit (11) that supplies power to the entrance slave unit with LA
E, the additional monitor has a carrier wave included in the video signal.
Carrier detection circuit (21) for detecting
When the carrier wave is detected in the circuit, the additional TV monitor
A power supply circuit (22) for supplying power to the
The inner monitor and the additional monitor are the TV monitor and the
Video that outputs the demodulated video signal to the extension TV monitor
A telecommunications system comprising a signal demodulation circuit (2, 19)
Levi talking device.