JP3440649B2 - Door phone equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom system for transmitting and receiving a signal between a slave unit installed at a front door and a master unit installed in a living room.

[0002]

2. Description of the Related Art FIG. 13 is an overall configuration diagram showing a conventional intercom system. The cordless handset 1a with a camera and the handset 1b without a camera installed at the entrance, etc. are each cable Ca.
1, Ca2, and terminal T, and is connected to base unit 2 installed in a room or the like of a building.

FIG. 14 shows a slave unit 1 with a camera according to a conventional example.
It is a block diagram of a. The handset 1a with a camera includes a diode bridge 101, a power supply circuit 102, and a push button 10.
3, call signal generation circuit 104, and camera unit 10
5, modulator 106, microphone 107, and speaker 10
8, a voice transmitting / receiving circuit 109, a demultiplexing circuit 110, and a terminal T. Where diode bridge 1
01 makes the connection with the base unit 2 non-polar. The power supply circuit 102 supplies the DC power supply separated by the demultiplexing circuit 110 to each circuit thereof. The paging signal generation circuit 104 transmits a paging signal to the demultiplexing circuit 110 to inform the resident of the building of the presence of the visitor by operating the push button 103. The camera unit 105 captures an image of a visitor and transmits it as a video signal to the modulator 106. The modulator 106 modulates the input video signal and transmits it to the demultiplexing circuit 110 as a video modulation signal. The microphone 107 transmits the voice of the visitor to the voice transmitting / receiving circuit 109 as a voice signal. The speaker 108 reproduces a voice signal input from the base unit 2 via the voice transmitting / receiving circuit 109 as voice. The voice transmitting / receiving circuit 109 amplifies the voice signal input from the microphone 107 and transmits it to the demultiplexing circuit 110, and also amplifies the voice signal transmitted from the parent device 2 and transmits it to the speaker 108. . The demultiplexing circuit 110 multiplexes a signal in the cable Ca1 with a video modulation signal, an audio signal, and a calling signal, and transmits the multiplexed signal to the master unit 2. At the same time, the multiplexed signal from the master unit 2 and the DC power source are transmitted. Is separated and transmitted to the voice transmission / reception circuit 109 and the power supply circuit 102.

FIG. 15 is a camera-less cordless handset 1 according to a conventional example.
It is a block diagram of b. The child device 1b without a camera is shown in FIG.
In the child device 1a with a camera shown in FIG.
No. 05 and modulator 106 are provided.

FIG. 16 is a block diagram of a base unit 2 according to a conventional example. The base unit 2 includes a power supply circuit 201, a demultiplexing circuit 202, a demodulator 203, a monitor unit 204,
Voice transmission / reception circuit 205, handset 206, ringing signal detection circuit 207, CPU 208, ringing tone generation circuit 209, speaker 210, switches SW1, SW
2, SW3, and a terminal T. Here, the power supply circuit 201 is connected to a commercial power supply, supplies DC power for operating each circuit of the master device 2, and also supplies the cable C.
DC power is also supplied to the slave unit with a camera 1a and the slave unit 1b without a camera via a1 and Ca2. The demultiplexing circuit 202 demultiplexes the signals multiplexed and transmitted from the camera-attached cordless handset 1a and the camera-less cordless handset 1b, transmits the signals to the respective circuits, and the cables Ca1,
The audio signal from the audio transmission / reception circuit 205 is multiplexed with the signal in Ca2 to add a camera-equipped slave unit 1a and a camera-less unit 1b.
Is to be sent to. The demodulator 203 demodulates the video modulation signal input from the demultiplexing circuit 202 and transmits it to the monitor unit 204 as a video signal. The monitor unit 204 displays the image of the video signal input from the demodulator 203. Voice transmission / reception circuit 20
5 receives the audio signals from the handset 1a with camera and the handset 1b without camera separated by the demultiplexing circuit 202 and transmits them to the handset 206, and amplifies the audio signal from the handset 206 to demultiplex the circuit. It is to be transmitted to 202. The handset 206 reproduces the voice signal input from the voice transmitting / receiving circuit 205 as a voice and transmits the voice of a resident or the like as a voice signal to the voice transmitting / receiving circuit 205. The calling signal detection circuit 207 detects the calling signal separated by the demultiplexing circuit 202 and transmits it to the CPU 208. CPU
Reference numeral 208 denotes a ringing signal detection circuit 207 that has detected the ringing signal.
On the basis of the camera-equipped slave unit 1a and the camera-less slave unit 1
The switches SW1 and SW2 for switching b and the switch SW3 for supplying DC power during operation are switched, and ON / OFF of the monitor unit 204 is controlled. In addition, the ringing tone generation circuit 209 is enabled to generate a ringing tone, and the speaker 210 rings.

[0006]

However, in the intercom apparatus having the above-mentioned configuration, the camera-equipped slave unit 1a is provided.
Or if you want to connect the handset 1b without camera to the base unit 2,
Since it has to be connected to each dedicated terminal T of the parent device 2, there is a problem in that incorrect construction is likely to occur.

[0007] Further, the child device 1 with a camera in the parent device 2
a, the number of terminals T required for connection with the cameraless handset 1b is, for example, 3 when the number of connectable terminals is 3 and 2 for the handset with camera 1a and 2 for the handset with camera 1a. 5 pairs of terminals T must be prepared so as to handle all connections of 1 unit and 1 unit without camera 1b, 1 unit with camera 1a and 2 units with camera 1b. There was a problem of not becoming.

The present invention has been made in view of the above points, and an object thereof is to have good workability and to minimize the number of terminals for connecting a slave unit in a master unit. It is to provide an intercom device that can be used.

[0009]

The invention according to claim 1 is
It has a master unit including a video display unit for displaying captured images and an audio input / output unit for inputting / outputting sound, and at least one of a slave unit with a camera and a slave unit without a camera. In a doorphone device that transmits and receives signals to and from a device, a camera presence / absence determining circuit for determining whether or not a child device has a camera is added to a parent device having the video display unit and an audio input / output unit, An intercom system in which the video display unit is operated based on the output of the camera presence / absence determining circuit.
Yes, the connection terminal power between the master unit and the slave unit when the push button of the slave unit is pressed.
There is a voltage difference between the slave unit with camera and the slave unit without camera.
Attach the ringing signal generation circuit set to
In addition, the camera presence / absence determining circuit is provided when the push button of the child device is pressed.
The connection terminal voltage between the master unit and the slave unit in
It is characterized in that whether or not the child device is equipped with a camera is discriminated by .

The invention according to claim 2 displays a photographed image.
Show the video display section and the audio input / output section that inputs and outputs audio.
A master unit that is equipped with a slave unit with or without a camera
Between at least one of the main unit and the slave unit.
In the intercom device that transmits and receives signals,
Base unit with display unit and voice input / output unit, slave unit with camera
A camera presence / absence determining circuit for determining whether or not the
The video display unit is operated based on the output of the camera presence / absence determining circuit.
It is an intercom device that is made to work, and a push button of a child device
Connection terminal voltage between the master unit and slave unit during standby before pressing
Causes a voltage difference between the camera-equipped slave unit and the camera-less slave unit.
Add a ringing signal generation circuit set to
However, the camera presence / absence determination circuit is
It is characterized in that whether or not the slave unit is equipped with a camera is determined by detecting a connection terminal voltage between the slave unit and the slave unit .

The invention according to claim 3 displays a photographed image.
Show the video display section and the audio input / output section that inputs and outputs audio.
A master unit that is equipped with a slave unit with or without a camera
Between at least one of the main unit and the slave unit.
In the intercom device that transmits and receives signals,
Base unit with display unit and voice input / output unit, slave unit with camera
A camera presence / absence determining circuit for determining whether or not the
The video display unit is operated based on the output of the camera presence / absence determining circuit.
It is a doorphone device that is made to work, with a camera
Machine modulates the video signal and sends it to the master machine as an FM modulated signal.
In the camera presence / absence determining circuit,
To detect the carrier component of the FM modulated signal output from
It is characterized in that whether or not the child device is equipped with a camera is discriminated by.

The invention according to claim 4 displays a photographed image.
Show the video display section and the audio input / output section that inputs and outputs audio.
A master unit that is equipped with a slave unit with or without a camera
Between at least one of the main unit and the slave unit.
In the intercom device that transmits and receives signals,
Base unit with display unit and voice input / output unit, slave unit with camera
A camera presence / absence determining circuit for determining whether or not the
The video display unit is operated based on the output of the camera presence / absence determining circuit.
It is a doorphone device that is made to work, with a camera
The base unit transmits a video signal to the base unit in the baseband, and the base unit
Can detect the horizontal sync component of the video baseband signal.
It is characterized in that whether or not the child device is equipped with a camera is discriminated by.

According to a fifth aspect of the present invention, a photographed image is displayed.
Show the video display section and the audio input / output section that inputs and outputs audio.
A master unit that is equipped with a slave unit with or without a camera
Between at least one of the main unit and the slave unit.
In the intercom device that transmits and receives signals,
Base unit with display unit and voice input / output unit, slave unit with camera
A camera presence / absence determining circuit for determining whether or not the
The video display unit is operated based on the output of the camera presence / absence determining circuit.
It is a doorphone device that is made to work and has the camera
The non-discrimination circuit operates when the slave unit operates after the push button of the slave unit is pressed.
When the power supply from the parent machine to the child machine is constant current, the parent machine
It is characterized in that whether or not the slave unit is equipped with a camera is determined by detecting a connection terminal voltage between the slave unit and the slave unit .

[0014]

[0015]

[0016]

[0017]

[0018]

DETAILED DESCRIPTION OF THE INVENTION

First Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a base unit 2 of an intercom system according to an embodiment of the present invention. It should be noted that the configurations of the handset 1a with a camera and the handset 1b without a camera are shown in FIG.
4, the configuration is the same as that shown in FIG. 15, so description thereof will be omitted here. Also in the parent device 2, the same parts as those shown in FIG. 16 as a conventional example are designated by the same reference numerals, and the description thereof will be omitted. Camera presence / absence determining circuit 21
The reference numeral 1 determines, based on the signal separated by the demultiplexing circuit 202, which one of the slave unit with a camera 1a and the slave unit without a camera 1b is called, and outputs it to the CPU 208.

FIG. 2 is a circuit diagram showing an example of the camera presence / absence determining circuit 211 according to this embodiment. The camera presence / absence determination circuit 211 includes a current detection circuit 211a and resistors R1 to R1.
3 and comparators CM1 and CM2. The current detection circuit 211a outputs a voltage value corresponding to the current consumption of the slave unit 1a with a camera and the slave unit 1b without a camera to the positive terminal on the input side of the comparators CM1 and CM2. A voltage obtained by dividing the reference voltage by the resistors R1 and R2 + R3 is input to the negative terminal on the input side of the comparator CM1, and the reference voltage is divided by the resistors R1 + R2 and the resistance on the negative terminal on the input side of the comparator CM2. The voltage divided by R3 is input.

The operation of this embodiment will be described below with reference to the drawings. When the push button 103 is pressed in the cordless handset 1a with a camera or the cordless handset 1b without a camera, the call signal detection circuit 207 detects a visitor, the CPU 208 turns on the switch SW3, and the base unit 2 detects that there is a visitor. For camera-equipped slave unit 1a or camera-less slave unit 1b,
Supplies DC power for operating each circuit. When there is no customer, only a small DC power source for detecting that the push button 103 is pressed is supplied.

Here, the current detection circuit 211a outputs a predetermined voltage to the comparators CM1 and CM based on the current consumed by the camera-equipped slave unit 1a or the camera-less slave unit 1b.
2 is applied to the positive terminal on the input side. Note that the current consumption of the handset 1a with a camera and the handset 1b without a camera are
"No cordless handset <Camera cordless cord 1b <Camera cordless cord 1
There is a relationship of "a".

FIG. 3 shows a comparator C according to this embodiment.
It is a table which shows an example of the output state of M1 and CM2.
When nothing is connected to the terminal T (not connected), the current detection circuit 211a does not apply a predetermined voltage, so that the outputs X and Y of the comparators CM1 and CM2 are both LOW.
Becomes When the push button 103 of the cameraless handset 1b is pressed, the current detection circuit 211a causes the comparator C to operate.
A voltage lower than the reference voltage of M1 and higher than the reference voltage of the comparator CM2 is applied to the positive terminal on the input side of the comparators CM1 and CM2. Then, the output X of the comparator CM1 becomes LOW and the output Y of the comparator CM2 becomes HIGH. When the push button 103 of the camera-equipped handset 1a is pressed, the current detection circuit 211a applies a voltage higher than the reference voltage of the comparators CM1 and CM2 to the positive terminal on the input side of the comparators CM1 and CM2. , Outputs X and Y of the comparators CM1 and CM2
Are both HIGH. Then, the CPU 208, based on the outputs X and Y from the comparators CM1 and CM2,
ON of monitor unit 204 and switches SW1, SW
Perform step 2.

Therefore, in this embodiment, the base unit 2 detects the outputs X and Y from the comparators CM1 and CM2 by the CPU 208, and the base unit 2 has the camera-equipped slave unit 1a.
It is possible to determine which of the push buttons 103 of the cameraless handset 1b has been pressed.

Second Embodiment FIG. 4 is a block diagram showing a base unit 2 of an intercom system according to another embodiment of the present invention. The configuration of the master device 2 according to the present embodiment is the same as that of the master device 2 shown in FIG.
A camera presence / absence determining circuit 211 and a resistor R4 are connected in series between the power supply circuit 201 and the demultiplexing circuit 202. The configurations of the handset 1a with a camera and the handset 1b without a camera are the same as those of the handset 1a with a camera and the handset 1b without a camera shown in FIGS. 14 and 15 as a conventional example.

FIG. 5 is a partial block diagram showing a part of the base unit 2, the camera-attached handset 1a and the cameraless handset 1b according to the present embodiment. The camera presence / absence determination circuit 211 according to the present embodiment has a configuration in which the current detection circuit 211a is removed from the camera presence / absence determination circuit 211 shown in FIG.
The calling signal generation circuit 104 of the handset 1a with a camera and the handset 1b without a camera includes a resistor R5, and a resistor R5.
Are connected in series between the push button 103 and the demultiplexing circuit 110.

The operation of this embodiment will be described below with reference to the drawings. The standby voltage V1 (point a) is supplied from the power supply circuit 201 of the master device 2 to the slave device 1a with a camera and the slave device 1b without a camera during standby. When the push button 103 is pressed, the voltage VL at the point b changes to the voltage V1-
It has a value obtained by dividing 2Vf (2Vf is the forward voltage of the bridge diode 101) by the resistors R4 and R5. Here, for example, if the resistance value of the resistor R5 is such that "the resistance value of the camera-less handset 1b <the resistance value of the camera-equipped handset 1a" is used, the camera-equipped handset 1a and the camera-less handset Depending on the type of 1b, the voltage VL is “the voltage VL when the cameraless handset 1b is connected <the voltage VL when the camera-attached handset 1a is connected”.

Therefore, as in the first embodiment, the CPU 20
The output X, Y of the comparators CM1, CM2 can determine which push button 103 of the handset 1a with a camera or the handset 1b without a camera is pressed.

= Embodiment 3 = FIG. 6 is a partial block diagram showing a part of a base unit 2, a handset 1a with a camera and a handset 1b without a camera according to another embodiment of the present invention. The configuration of the parent device 2 according to the present embodiment is the same as the configuration of the parent device 2 shown in FIG. 4, and the configurations of the child device 1a with a camera and the child device 1b without a camera are shown in FIGS. The configurations are the same as those of the handset 1a with a camera and the handset 1b without a camera shown in FIG. Further, the configuration of the camera presence / absence determining circuit 211 according to the present embodiment is the same as the configuration of the camera presence / absence determining circuit 211 shown in FIG. The call signal generation circuit 104 according to the present embodiment is similar to the call signal generation circuit 104 shown in FIG.
It is a configuration in which is connected.

The operation of this embodiment will be described below with reference to the drawings. The standby voltage V1 (point a) is supplied from the power supply circuit 201 of the master device 2 to the slave device 1a with a camera and the slave device 1b without a camera during standby. At this time, the voltage VL at the point b is the voltage V1 which is the same as the resistance R4 and the resistance (R5 + R6).
The value is divided by. Here, if the value of the resistor R6 is set as "resistor R6 of the cameraless handset 1b <resistance R6 of the cameraless handset 1a", depending on the types of the camera-attached handset 1a and the cameraless handset 1b, The voltage VL is “the voltage VL when the cameraless slave 1b is connected <the voltage VL when the cameraless slave 1a is connected”.

Therefore, as in the first and second embodiments, the CPU
Based on the outputs X and Y of the comparators CM1 and CM2, the 208 can determine which of the push buttons 103 of the handset 1a with a camera and the handset 1b without a camera is pressed.

= Embodiment 4 = FIG. 7 shows a slave unit 1 with a camera according to another embodiment of the present invention.
5A is a voltage characteristic diagram at a point b of the parent device 2 shown in FIG. When the push button 103 of the child device 1a with a camera or the child device 1b without a camera is pressed, the switch SW3 of the parent device 2 is turned on, and the power supply circuit 20
A constant current is supplied from 1 to the handset 1a with a camera or the handset 1b without a camera, and the operating state is established. Here, since the camera-less cordless handset 1b consumes less current than the camera unit 105 as compared to the camera-attached cordless handset 1a, the voltage VL generated at the terminal T rises and "the voltage of the terminal T when the camera-attached cordless handset 1a is connected is increased. VL <voltage VL of terminal T when cameraless slave unit 1b is connected ”, and the CPU 208 uses the comparator CM.
From the outputs X and Y of CM1 and CM2, it is possible to determine whether the slave connected to the terminal T is the slave without camera 1b or the slave with camera 1a.

Embodiment 5 = FIG. 8 is a block diagram showing a camera presence / absence determining circuit 211 according to another embodiment of the present invention. The configuration of the parent device 2 according to the present embodiment is the same as the configuration of the parent device 2 shown in FIG. 4, and the configurations of the child device 1a with a camera and the child device 1b without a camera are shown in FIGS. The configurations are the same as those of the handset 1a with a camera and the handset 1b without a camera shown in FIG. The camera presence / absence determination circuit 211 according to the present embodiment includes a bandpass filter 211b and a peak detection circuit 211c.

In the present embodiment, for example, when the video signal output from the camera-equipped slave unit 1a is FM-modulated, the carrier component of the FM-modulated signal is extracted by the bandpass filter 211b and the peak detection circuit 211c is used. By detecting the presence or absence of a video signal, it is determined whether or not it is the slave unit with a camera 1a, and when the video signal output from the slave unit with a camera 1a is a baseband, horizontal synchronization of the video baseband signal is performed. Bandpass filter 21
1b, and the presence or absence of a video signal is detected by the peak detection circuit 211c to determine whether or not it is the camera-equipped slave unit 1a, and the same operation as in the first to fourth embodiments is performed.

= Sixth Embodiment = FIG. 9 is a circuit diagram showing a ringing signal detection circuit 207 according to another embodiment of the present invention, and FIG. 10 is a circuit showing a ringing signal generation circuit 104 according to this embodiment. It is a figure. In addition,
The configuration of the parent device 2 according to the present embodiment is the same as the configuration of the parent device 2 shown in FIG. 4, and the configurations of the child device 1a with a camera and the child device 1b without a camera are shown in FIGS. The configurations are the same as those of the child device 1a with a camera and the child device 1b without a camera. This embodiment is characterized in recall the second and subsequent from standby be connected camera handset 1a to the terminal T, is intended to prevent the interruption image of the monitor unit 204 the base unit 2, this embodiment in the embodiment, it is configured to detect a change in current a second and subsequent recall. The call signal detection circuit 207 of the base unit 2 includes a first push button detection circuit 207a and a second push button detection circuit 20.
7b and.

The push button detection circuit 207a includes a PNP transistor Q1, an NPN transistor Q2, and resistors R9-R9.
It is composed of R11 and. Push button detection circuit 207b
Is composed of a current detection circuit 207b ', resistors R7 and R8, and a comparator CM3. Current detection circuit 2
07b 'is a child device 1a with a camera and a child device 1b without a camera.
The voltage value corresponding to the current consumption of is output to the positive terminal on the input side of the comparator CM3. Comparator C
A voltage obtained by dividing the reference voltage by the resistors R7 and R8 is input to the negative terminal on the input side of M3.

Then, the calling signal generation circuit 204 uses the NP
N transistors Q3 to Q5, resistors R12 to R20,
It is composed of a Zener diode ZD1, a diode D1 and a constant current source I1.

When the first push button 103 is pressed in the handset 1a with camera, the NPN transistor Q3
Is turned on, and the terminal T is short-circuited via the resistor R12. In response to this, the PNP transistor Q1 is transmitted from the collector of the NPN transistor Q2 to the CPU 208, and the CPU 208 turns on the switch SW3,
Power supply to the camera-equipped slave unit 1a is started, and the camera enters the operating state. Here, the voltage supplied to the camera-equipped slave unit 1a is
The value of the Zener diode ZD1 is set to be "standby <operating time (about twice as much as standby)", and the value of the Zener diode ZD1 is set between the standby supply voltage and the operating supply voltage. Handset 1a with camera
When is activated, the supply voltage to the slave unit 1a is set to "standby time <operating time (about twice as much as standby time)", and the Zener diode ZD1 operates to turn on the NPN transistor Q4. NPN transistor Q3 is turned off,
On the contrary, the constant current source I1 is in the operating state. At the same time, the monitor unit 204 is also in the operating state and the image taken by the camera unit 105 is displayed. When the push button 103 is pressed for the second time and thereafter, the NPN transistor Q5 is turned on and the current consumption of the constant current source I1 increases. This current is current-voltage converted by the current detection circuit 207b ', and then the comparator C
It is detected at M3 that the push button 103 has been pressed. Since the current change is used as the transmission means here, the second
Monitor unit 2 by pressing the push button 103 after the first time
The video of 04 is not interrupted.

= Seventh Embodiment = FIG. 11 is a circuit diagram showing a ringing signal detection circuit 207 according to another embodiment of the present invention, and FIG. 12 is a circuit showing a ringing signal generation circuit 104 according to this embodiment. It is a figure. The configuration of the parent device 2 according to the present embodiment is the same as the configuration of the parent device 2 shown in FIG. 4, and the configurations of the child device 1a with a camera and the child device 1b without a camera are shown in FIGS. The configurations are the same as those of the handset 1a with a camera and the handset 1b without a camera shown in FIG. Features of the present embodiment, even by connecting the camera slave unit 1a to the terminal T at re invocation <br/> teeth of second and subsequent from standby to prevent interruption image of the monitor unit 204 of the main terminal 2 are those, in the present embodiment, the second and subsequent recall is to detected by a change in voltage. The call signal detection circuit 207 of the base unit 2 includes a first push button detection circuit 207a and a second push button detection circuit 2
07b and. The push button detection circuit 207a has a P
NP transistor Q6, NPN transistor Q7,
The push button detection circuit 207b is composed of resistors R21 to R23 and a zener diode ZD2.
The calling signal generating circuit 104 includes NPN transistors Q8 to Q10 and M4 and resistors R24 to R27.
It is composed of resistors R28 to R35 and a Zener diode ZD3.

When the first push button 103 is pressed in the slave unit 1a with camera, the NPN transistor Q8
Is turned on, and the terminal T is short-circuited via the resistor R28. In response to this, the PNP transistor Q6 is turned on, and the CPU 20 from the collector of the NPN transistor Q7.
8, the switch SW3 is turned on by the CPU 208, power supply to the camera-equipped slave unit 1a is started, and the operating state is set. The voltage supplied to the camera-equipped handset 1a is
The value of the Zener diodes ZD2 and ZD3 is set to the intermediate value between the standby supply voltage and the operation supply voltage.
When the camera-equipped cordless handset 1a is activated, the Zener diode ZD3 is activated and the NPN transistor Q9 is turned on. Therefore, the NPN transistor Q8 is turned off, and at the same time, the monitor unit 204 is activated and an image is taken by the camera unit 105. Video is displayed.

Pressing the push button 103 from the second time onward does not
The PN transistor Q10 is turned on, and the voltage VL at point b
Is a value divided by the resistors R27 and R34. The comparator CM4 changes the voltage VL at the point b by the push button 1
It is detected that 03 is pressed. Here, the resistor R2
7 is set to a small value and the resistance R34 is set to a large value with respect to the resistance R27, the change amount of the voltage VL at the point b can be made minute, and the second and subsequent push buttons 103
The image on the monitor unit 204 is not interrupted by pressing.

[0041]

According to the invention as set forth in claims 1 to 5, a master unit comprising a video display unit for displaying a shot video and a voice input / output unit for inputting / outputting voice, a slave unit with a camera or no camera. In a doorphone device including at least one of the slaves and transmitting and receiving a signal between the master and the slaves, the slave includes a camera on the master including the video display unit and the audio input / output unit. Since a camera presence / absence determining circuit for determining whether or not the camera is attached and operating the image display unit based on the output of the camera presence / absence determining circuit It was possible to provide a doorphone device that can be connected without distinction, has good workability, and can minimize the number of terminals for connecting a child device in a parent device.

[0042]

According to the first aspect of the invention , the connection terminal voltage between the master unit and the slave unit when the push button of the slave unit is pressed is set so that a voltage difference occurs between the slave unit with the camera and the slave unit without the camera. A call signal generation circuit is added to the slave unit, and the camera presence / absence determination circuit detects whether or not the slave unit has a camera by detecting the connection terminal voltage between the master unit and the slave unit when the push button of the slave unit is pressed. Since it is determined whether or not it is, it is possible to connect to the master unit without distinguishing between the slave unit with a camera and the slave unit without a camera.

According to the second aspect of the invention , the connection terminal voltage between the master unit and the slave unit in the standby state before the push button of the slave unit is pressed,
A calling signal generation circuit set to generate a voltage difference between a camera-equipped slave unit and a camera-less slave unit is added to the slave unit, and the camera presence / absence determination circuit is a connection terminal between the master unit and the slave unit during standby. Since it is determined whether or not the child device has a camera by detecting the voltage, it is possible to connect the child device with a camera and the child device without a camera to the parent device without distinction.

According to the third aspect of the present invention , the slave unit with a camera modulates a video signal and transmits it as an FM modulation signal to the master unit, and the master unit outputs the FM modulation output from the slave unit in the camera presence / absence determining circuit. By detecting the carrier wave component of the signal, it is determined whether or not the child device has a camera. Therefore, the child device with a camera and the child device without a camera can be connected to the parent device without distinction.

According to the fourth aspect of the present invention , the slave unit with the camera transmits the video signal to the master unit in the baseband, and the master unit detects the horizontal synchronization component of the video baseband signal, so that the slave unit is the camera. Since it is determined whether or not the child device is attached, the child device with a camera and the child device without a camera can be connected to the parent device without distinction.

According to the fifth aspect of the present invention , the camera presence / absence determining circuit is arranged so that when the power supply from the master unit to the slave unit during the slave unit operation after the push button of the slave unit is pressed is constant current, the master unit and the slave unit. By detecting the connection terminal voltage between and, it is possible to determine whether the child device has a camera or not, so it is possible to connect the child device with a camera and the child device without a camera to the parent device without distinction. .

[0048]

[0049]

[Brief description of drawings]

FIG. 1 is a block diagram showing a master unit of an intercom system according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a camera presence / absence determining circuit according to the present embodiment.

FIG. 3 is a table showing an example of an output state of a comparator according to this embodiment.

FIG. 4 is a block diagram showing a master unit of an intercom system according to another embodiment of the present invention.

FIG. 5 is a partial block diagram showing a part of a master unit and a slave unit according to the present embodiment.

FIG. 6 is a partial block diagram showing a part of a parent device and a child device according to another embodiment of the present invention.

7 is a voltage characteristic diagram at point b of the parent device shown in FIG. 4 according to another embodiment of the present invention, the child device with a camera and the child device without a camera.

FIG. 8 is a block diagram showing a camera presence / absence determining circuit according to another embodiment of the present invention.

FIG. 9 is a circuit diagram showing a ringing signal detection circuit according to another embodiment of the present invention.

FIG. 10 is a circuit diagram showing a call signal generation circuit according to the present embodiment.

FIG. 11 is a circuit diagram showing a ringing signal detection circuit according to another embodiment of the present invention.

FIG. 12 is a circuit diagram showing a call signal generation circuit according to the present embodiment.

FIG. 13 is an overall configuration diagram showing a doorphone device according to a conventional example.

FIG. 14 is a block diagram of a slave unit with a camera according to a conventional example.

FIG. 15 is a block diagram of a slave unit without a camera according to a conventional example.

FIG. 16 is a block diagram of a parent device according to a conventional example.

[Explanation of symbols]

1a Handset with camera 1b Handset without camera 2 parent machine 101 diode bridge 102 power supply circuit 103 push button 104 Call signal generation circuit 105 camera unit 106 modulator 107 microphone 108 speakers 109 Voice transmission / reception circuit 110 demultiplexing circuit 201 power supply circuit 202 Demultiplexing circuit 203 demodulator 204 monitor unit 205 Voice transmission / reception circuit 206 handset 207 Ringing signal detection circuit 207a, 207b push button detection circuit 207b 'current detection circuit 208 CPU 209 Ring tone generator 210 speaker 211 Camera presence / absence determination circuit 211a Current detection circuit 211b Bandpass filter 211c Peak detection circuit SW1 to SW3 switches T terminal Ca1, Ca2 cable CM1-CM4 comparator R1-R35 resistance ZD1 to ZD3 Zener diode D1 diode Q1 to Q10 transistors I1 constant current source

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-154132 (JP, A) JP-A 7-177496 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04M 9/00-9/10

Claims (5)

(57) [Claims] 1. A master unit comprising a video display unit for displaying a captured video and an audio input / output unit for inputting / outputting sound, and at least one of a slave unit with a camera and a slave unit without a camera. In a doorphone device that transmits and receives a signal between the master unit and the slave unit, the master unit including the video display unit and the audio input / output unit determines whether or not the slave unit has a camera adding circuit, and so as to operate the image display unit based on an output of the camera existence determination circuit de
It is an aphone device, and between the master unit and the slave unit when the push button of the slave unit is pressed
The connection terminal voltage of the slave unit with camera and the slave unit without camera
The ringing signal generation circuit set to generate a voltage difference with
In addition to the slave unit, the camera presence / absence determining circuit is
Connection terminal voltage between the master unit and slave unit when the push button is pressed
To detect whether or not the cordless handset is equipped with a camera
The intercom device is characterized in that 2. A video display section for displaying a captured video and sound.
A master unit including a voice input / output unit for inputting / outputting a voice, and
At least one of the slave with or without camera
It is equipped with a device that transmits and receives signals between the master unit and the slave unit.
In the aphon device, the video display unit and the audio input / output unit
The base unit equipped with a function to determine whether the handset has a camera or not.
A camera presence / absence determining circuit is added to output the camera presence / absence determining circuit.
The video display is operated based on the force.
It is an aphone device and is in standby before pressing the push button of the cordless handset.
The connection terminal voltage between the master unit and the slave unit of the
A ringing signal that is set so that a voltage difference will occur with a handset without a camera
A signal generation circuit is added to the slave unit to determine the presence / absence of the camera.
The circuit is the connection terminal voltage between the master unit and the slave unit during standby.
De Ahon device you characterized in that as the slave unit determines whether the camera-equipped by detecting the pressure. 3. A video display section for displaying a captured video and sound.
A master unit including a voice input / output unit for inputting / outputting a voice, and
At least one of the slave with or without camera
It is equipped with a device that transmits and receives signals between the master unit and the slave unit.
In the aphon device, the video display unit and the audio input / output unit
The base unit equipped with a function to determine whether the handset has a camera or not.
A camera presence / absence determining circuit is added to output the camera presence / absence determining circuit.
The video display is operated based on the force.
This is a phone device, and the slave unit with a camera modulates the video signal.
Then, the signal is transmitted as an FM modulated signal to the master unit.
In the melody presence / absence determining circuit, FM change output from the slave unit
By detecting the carrier component of the tone signal, de <br/> Ahon device you characterized in that the slave unit is adapted to determine whether the camera-equipped. 4. A video display unit for displaying a captured video and sound.
A master unit including a voice input / output unit for inputting / outputting a voice, and
At least one of the slave with or without camera
It is equipped with a device that transmits and receives signals between the master unit and the slave unit.
In the aphon device, the video display unit and the audio input / output unit
The base unit equipped with a function to determine whether the handset has a camera or not.
A camera presence / absence determining circuit is added to output the camera presence / absence determining circuit.
The video display is operated based on the force.
This is a phone device, and the slave unit with a camera
Send to the base unit via Sband, and the base unit
Horizontal by detecting a synchronization component, the slave unit door <br/> phone device you characterized in that so as to determine whether the camera with the item. 5. A video display section for displaying a captured video and sound.
A master unit including a voice input / output unit for inputting / outputting a voice, and
At least one of the slave with or without camera
It is equipped with a device that transmits and receives signals between the master unit and the slave unit.
In the aphon device, the video display unit and the audio input / output unit
The base unit equipped with a function to determine whether the handset has a camera or not.
A camera presence / absence determining circuit is added to output the camera presence / absence determining circuit.
The video display is operated based on the force.
It is a phone device, and the camera presence / absence determination circuit is
From the base unit to the handset when the handset operates after pressing the push button
If the power supply of the unit is constant current, the connection end between the master unit and the slave unit
It was set to the slave unit determines whether the camera-equipped by detecting a child voltage de Ahon device you characterized.