JP3437855B2 - TV door phone with electric lock / unlock function - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a slave unit equipped with a visitor monitoring camera and a master unit equipped with a television monitor for displaying a video image captured by the camera of the slave unit. The present invention relates to a TV intercom having an electric lock / unlock function as an additional function, and particularly to a TV intercom with an electric lock / unlock function having a novel system for identifying an unlock signal in the electric lock / unlock function. .

[0002]

2. Description of the Related Art With the progress of home automation in recent years, a TV intercom that can talk to visitors while watching a monitor TV is being put to practical use on the intercom installed at the entrance. Separately from this, for example, an electric lock system having an excellent crime prevention function is rapidly spreading, which can be locked / unlocked only by inputting a secret signal such as a personal identification number with a ten-key pad.

By the way, in the TV intercom, a device equipped with a monitor TV, a device installed in a home is called a master device, a device equipped with a visitor monitoring TV camera, and a device installed at an entrance is called a slave device. The child machine is installed at the entrance of the house such as the entrance, and is used to confirm and respond to visitors.

Further, in the electric lock system, a secret signal input device is installed in the vicinity of the front door, and the secret key is used to unlock the electric lock of the front door that is locked when the family member returns from outside. A controller that is used as a device for inputting a signal and that controls the locking / unlocking by identifying the input secret signal is installed in the house.

As described above, in the TV door phone and the electric lock system, both the indoor device and the outdoor device are installed close to each other, but conventionally, the slave device of the TV door phone and the secret signal input device of the electric lock system are installed. , They were installed independently as separate devices. For this reason, it is necessary to separately provide dedicated wiring for the wiring between the child device on the entrance side and the parent device on the inside of the house and between the secret signal input device and the controller.

A conventional TV door phone and electric lock system will be described below with reference to a concrete example. FIG. 14 is a block diagram showing a configuration of a slave unit and a base unit of the conventional TV door phone, and FIG. 15 is a secret of the conventional electric lock system. It is a block diagram of a signal input machine and a controller.

First, the conventional TV door phone shown in FIG. 14 is a two-wire TV door phone in which replacement of an existing two-wire intercom is taken into consideration. The main functions of the slave unit are a calling function and a calling function. , It is the function of transmitting and receiving the video and audio of the visitor with the base unit. Therefore, it is necessary to transmit four points of the power source, the video signal, the audio signal, and the calling signal between the slave unit and the master unit. , Video signal FM carrier c, first call signal d1, second
The calling signal d2 is superimposed.

CCD 2 through camera lens 1 of handset K
The optical signal f incident on the
It is converted to the SC system video signal e. After that, it is FM-modulated by the FM modulator 4 and is output between the two lines A1 and A2 via the impedance upper 5.

This video signal, that is, the FM carrier c, is demodulated by the FM demodulation section 8 via the impedance upper 7 of the parent device P, restored to the original NTSC system video signal e, and then in the video signal processing circuit 9. Amplification and sync signal separation are performed. The amplified video signal e and the deflection output obtained by the sync signal separation are input to the CRT 10, and the video imaged by the slave K is displayed on the CRT monitor screen of the master P.

The voice signal b is transmitted bidirectionally between the two lines A1 and A2. The sound from the master unit P side to the slave unit K side is microphone 11 → voice circuit 12 → impedance upper 7 →
The signal is transmitted through the path between the two lines A1 and A2 → impedance upper 5 → audio circuit 15 → speaker 16. In addition, the sound from the child device K side to the parent device P side is microphone 14 → audio circuit 15 → impedance upper 5 → two lines A1 and A2.
The signal is transmitted through the route of the space → the impedance upper 7 → the voice circuit 12 → the speaker 13.

Regarding the flow of the power supply a from the parent device P to the child device K, after AC 100 V is converted into a DC voltage by the AC adapter 18, the power supply circuit 17 makes the voltage constant. The constant voltage power supply of the power supply circuit 17 serves not only as a power supply for each circuit in the parent device P but also as a power supply a for the child device K and is output between the two wires A1 and A2 via the impedance upper 7.

The voltage output between the two lines A1 and A2 differs between the standby state and the operating state. The standby state is a state in which a visitor appears and waits for an image pickup / communication to start, and the operating state is a standby state in which the call button 19 of the handset K is pressed and a first call signal d1 described later is generated. After being sent, it is assumed that imaging and talking are being performed.

Since the time required for imaging and talking is not so long due to the reception of the visitor, it is necessary to return to the original standby state after a relatively short time has elapsed after switching from the standby state to the operating state. I have to. The master unit side control circuit 20 provided in the master unit P performs switching between the standby state and the operating state, and the power source control signal g output from the master unit side control circuit 20 causes the high output impedance between the two wires A1 and A2 in the standby state. A low voltage is output in the state, and a high voltage is output in the operation state in the low output impedance state.

In the operating state, both the parent device P and the child device K
Power is supplied to all circuits, and all circuits are operating. However, in the standby state, almost all circuits on the handset K side are in an inoperable state, and a function to send the first call signal d1. Only will be operational. Further, in the standby state, the transistor 21 is turned off also on the parent device P side, so that the FM demodulation unit 8, the video signal processing circuit 9, and the audio circuit 12 are provided.
The power supply to the circuit is stopped, and the operation of these circuits 8, 9 and 12 is also stopped.

The power source a supplied to the slave unit K from between the two wires A1 and A2 is input to the power source circuit 6 through the impedance upper 5, and is converted to a constant voltage in the operating state, and each unit in the slave unit K is operated. The power supply a is supplied to the circuit and the power supply circuit 6 supplies power to the energization display LED 22 and the infrared LED 23, and the LEDs 22 and 23 are turned on.

In the standby state, the power supply a is the power supply circuit 6
Input to the LEDs 22, 2 from the circuit 6
No output to 3. However, as described above, call button 1
When 9 is pressed, it is necessary to send the first call signal d1. Therefore, the slave unit side control circuit 24 connected to the call button 19 has a high output impedance from the master unit P via the impedance upper 5, Low voltage power is input.

When the call button 19 is pressed while the constant voltage from the power supply circuit 6 is input, the slave unit side control circuit 24 sends out the second call signal d2. Further, when the call button 19 is pressed in a state where there is no constant voltage input from the power supply circuit 6 in the standby state and the high output impedance and low voltage power source is input from the impedance upper 5,
The first call signal d1 is transmitted.

The first call signal d1 is a signal for switching from the standby state to the operating state, and the call button 19 is activated in the standby state.
When is pressed, the first call signal d1 is sent by momentarily shorting the high-impedance, low-voltage power source output from the parent device P to momentarily drop the voltage between the two lines A1 and A2. When this drop is detected by the voltage monitoring circuit 25, a low output impedance and a high voltage are output between the two wires A1 and A2 to turn on the power supply to all the circuits in the parent device P and the parent device side. The control circuit 20 outputs a chime sound, and the speaker 26 causes the chime sound to sound.

At the same time when the first call signal d1 is sent to the master side control circuit 20, the control circuit 20 causes the power supply circuit 1 to operate.
By controlling 7, the power supply a to the handset K is switched from high impedance, low voltage to low impedance, high voltage, and the power supply a is supplied to all circuits of the handset K. In this way, the image pickup by the child device K, the image display by the parent device P, and the call between the parent device P and the child device K become possible.

On the other hand, the second call signal d2 is a signal in the operating state, and is output when the call button 19 is pressed again, such as when the visitor does not answer even if the call button 19 is pressed. This signal must be output in the operating state while the video signal FM carrier c is continuously output.
It is sent by turning off only part of the carrier c. In addition, from the video signal processing circuit 3 to the slave side control circuit 24
The vertical reference signal h input to the
It is for making the timing to F.

On the side of the parent device P, a part OF of the FM carrier c
The F signal is detected by the FM demodulation unit 8 and the second calling signal d2 is detected.
Is input to the control circuit 20. When the second calling signal d2 is input, the control circuit 20 outputs a chime sound and causes the speaker 26 to sound the chime sound.

Next, the electric lock system shown in FIG. 15 will be described. Its main function is to lock / unlock the electric lock by the controller identifying the personal identification number input by the ten-key pad of the secret signal input device. Especially. In FIG. 15, the secret signal input device S is a numeric keypad 5.
1 and a decoder 52, and the power required for its operation is supplied from the controller C side.

The numeric keys 51 are arranged in a matrix,
When any one of the keys is pressed, the decoder 52 starts its operation and sends a code corresponding to the pressed key, for example, a 4-bit code to the controller C side. Reference numeral 53 is an LED for displaying a locked / unlocked state.

The controller C has a control circuit 54 and a personal identification number setting switch 55. The control circuit 54 discriminates whether or not a series of input numbers from the ten-key pad 51 of the secret signal input device S coincides with a series of numbers set by the personal identification number setting switch 55 in advance. 56 or unlock coil 5
7 is driven to lock or unlock the electric lock.

At the same time, a signal for controlling the driving of the locking / unlocking LED 53 of the secret signal input device S is output,
The LED 53 is turned on when locked and turned off when unlocked. Reference numeral 58 is a power supply circuit, which receives input AC100V
A constant voltage power supply required to operate the electric lock / lock coil 56, the unlock coil 57, the control circuit 54 and the like is made from the power supply.

As described above, in the electric lock system of the conventional example, the power supply, the 4-bit code, and the lock / unlock LED are provided between the secret signal input device S and the controller C.
Three points of drive output must be transmitted.

In the above-mentioned conventional example, it is premised that the slave unit K and the secret signal input unit S are separately and independently installed, and wiring to the master unit P and the controller C installed in the house is also separately performed. Installing both devices as separate products at the entrance, etc. gives a complicated impression.

Therefore, paying attention to the fact that the child device K of the TV door phone and the secret signal input device S of the electric lock system are installed at the same place or in the vicinity of the entrance, the child device K and the secret signal input device. The one in which S is mechanically integrated and the master P and the controller C, which are similarly installed in the home, are integrated, is, for example, Shoukaisho 61-2958.
No. 0 publication.

[0029]

According to the above prior art, the TV intercom and the electric lock system device installed at the entrance and the home are integrated to improve the cohesion, and the construction and wiring can be conveniently performed. It can be said that it also contributes to a certain cost reduction.

However, when the mechanical structure is integrated as described above, the child device K constituting the entrance side unit is formed.
Each of the secret signal input device S, the parent device P and the controller C that configure the in-home unit, requires a block having a hardware independent function in each unit. Therefore, in the above-mentioned conventional structure, there is a limit to the reduction in size and further cost reduction.

The present invention has been made in view of the above conventional problems, and has the functions of the secret signal input device and the controller of the electric lock system, which are the original functions of the slave unit and the master unit of the TV intercom. A TV door phone with an electric locking / unlocking function that can be further miniaturized and reduced in cost by adopting a configuration in which software is added rather than hardware, and which has excellent operability. It is intended to provide.

[0032]

In order to achieve the above object, according to the present invention, a calling button, means for sending a calling signal output from the calling button, a visitor monitoring camera, and an image output from the camera. An intercom comprising a slave unit including a signal sending unit and a master unit including a television monitor that displays a video image captured by the camera based on a video signal of the video signal sending unit of the slave unit.
A secret signal input means for inputting a secret signal for locking and / or unlocking the electric lock using the camera is attached to the slave unit at a position closer to the visitor.
The secret pattern is imaged, and on the other hand, the master unit is provided with identification means for identifying whether the secret signal is correct or not.

In the above configuration, a secret card in which a barcode-like pattern corresponding to the secret signal is written is prepared. Then, the secret signal input means is capable of resolving the pattern of the secret card in a state where the secret card is in close contact with the front end surface of the camera lens,
Further, while being constituted by a camera that also serves as a visitor monitoring camera, the identifying means identifies the correctness of the secret signal by comparing and comparing the pattern of the card imaged by the camera with a registered pattern. Can be configured.

[0034] Alternatively, Shikure the number of operations and / or timing of the button switch further forming the calling unit
The secret signal can be inputted, and the correctness of the secret signal can be identified by comparing and comparing the registered number of times and / or timing of the button switch.

Furthermore the identification process of the secret signal, and secret signal input and the identification of the claim 2,
The master unit may be provided with an identification selecting unit capable of arbitrarily selecting whether to perform the secret signal input and the identification according to the third aspect or a combination of both.

The bar code-like pattern of the secret card can be arbitrarily written on the card body, and different bar code rows can be formed in a plurality of rows. Further, in the state where the card is in close contact with the front end face of the camera lens, the front end face of the camera lens is formed into a flat surface having a shape and a size capable of shielding light, and a barcode-like pattern imaging illumination written on the secret card. The means may be constituted by an infrared LED for night illumination built in the camera.

Further, the following configuration can be added to the above configuration. First, the slave unit is provided with a speaker, and a memory unit and a confirmation notifying unit are provided so that the video information of the barcode pattern of the secret card imaged by the camera of the slave unit can be written in the memory unit as a registered pattern. Further, by the operation of the confirmation notifying means, it is possible to generate confirmation voice of confirmation of registration of the barcode-like pattern and confirmation voice of the pattern of the secret signal based on the pattern from the speaker.

It is assumed that the secret card is provided with a card movement detecting means for detecting the movement operation of the card when the barcode-like pattern is imaged while reciprocating along the front end surface of the camera lens. Further, preferably, guide means for restricting the attitude and / or moving direction of the secret card is provided on the front end surface of the camera lens.

When the barcode-like pattern written on the secret card is picked up by the camera of the child device and the video signal level corresponding to the secret signal is lowered due to dirt on the front window of the camera lens or the card itself, It is assumed that the apparatus is provided with an image defect notifying means for notifying by sound from a speaker provided in the child device.

An energization display LED and / or a speaker for notification is provided on the slave unit, and the energization display LED or the notification speaker is used to display an input mode when a secret signal is input and to confirm an operation of locking / unlocking an electric lock. Is displayed and / or informed.

[0041]

According to the above construction, the secret signal of the conventional secret signal input device in the electric lock system is utilized by utilizing the calling function, the calling signal sending function, the imaging function, and the video signal sending function of the slave unit. The input function can be substituted. That is, a secret signal is input using the calling function or the imaging function, the calling signal or video signal is sent to the master unit, and the correctness of the secret signal is identified by the identifying means provided in the parent unit. .

Specifically, a secret card having a bar code-like pattern is brought into close contact with the camera of the child device, and the infrared LED for night illumination built in the child device is used to illuminate the card for imaging. The imaged bar code-like pattern on the card is transmitted to the base unit in the form of a video signal. The parent device can be identified by simple pattern recognition, and if it matches the preset barcode-like pattern, it will be locked / unlocked.

Further, for example, after confirming the coincidence of the bar code-like pattern, the timing of sending the calling signal is also checked at the same time, whereby the secret property can be improved. In addition, it is possible to confirm whether the electric lock is locked / unlocked by using the energization display LED or the speaker of the child device.

[0044]

FIG. 1 is a block diagram showing the configurations of a child device K and a parent device P in a TV door phone with an electric lock / unlock function according to an embodiment of the present invention. In this embodiment, the same reference numerals are given to the portions having the same configurations and operations as those of the above-mentioned conventional example.

The TV intercom of the present embodiment shown in FIG. 1 is a two-wire type TV intercom in consideration of replacement with an existing two-wire intercom, and a power supply is provided between the slave K and the master P. , The video signal, the audio signal, and the call signal need to be transmitted, and the power supply a to the slave K, the audio signal b, the video signal FM carrier c, and the first call signal d1 are provided between the two lines A1 and A2. , The second calling signal d2 is superimposed.

The image signal FM carrier is a signal of the image signal e.
The carrier is M-modulated and does not overlap the frequency band of the audio signal b and is suitable for FM-modulating the video signal e of 0 to 4 MHz, and its frequency is selected to be 6 MHz, for example.

The handset K has a visitor monitoring camera, and has a calling function and a function of transmitting / receiving a visitor's image and voice to / from the base unit. 1 is a camera lens, 2 is a CCD,
Reference numeral 3 is a video signal processing circuit, 4 is an FM modulator, 5 is an impedance upper, and 6 is a power supply circuit. The master P is the slave K
It has a function to display the image captured by
Reference numeral 7 is an impedance upper, 8 is an FM demodulation unit, 9 is a video signal processing circuit, and 10 is a CRT constituting a monitor screen.
Is.

In the above structure, the video signal is transmitted as follows. The optical signal f incident on the CCD 2 through the lens 1 is sent to the NTSC by the video signal processing circuit 3.
The video signal e of the system is converted. After that, the FM modulator 4
FM modulated at 2 via impedance upper 5
It is output between the lines A1 and A2. The impedance upper 5 has a low impedance on the side of the power supply circuit 6 and has two wires A1 and A.
The second side is converted into a high impedance, which prevents the video carrier c and the audio signal b from being short-circuited due to the low impedance of the power supply circuit 6.

The video signal FM-modulated and output between the two lines A1 and A2, that is, the FM carrier c is demodulated by the FM demodulator 8 via the impedance upper 7 of the parent device P, and the original NTSC system video signal. After returning to e, the video signal processing circuit 9 performs amplification and separation of the sync signal. The amplified video signal e and the deflection output obtained by the synchronization signal separation are input to the CRT 10, and the video image captured by the slave K is the master P.
Will be displayed on the CRT monitor screen.

On the master unit P side, 11 is a microphone,
Reference numeral 12 is a voice circuit, and 13 is a speaker. On the side of the handset K, 14 is a microphone, 15 is a voice circuit,
16 is a speaker.

The voice signal b is transmitted bidirectionally between the two lines A1 and A2. The sound from the master unit P side to the slave unit K side is microphone 11 → voice circuit 12 → impedance upper 7 →
The signal is transmitted through the path between the two lines A1 and A2 → impedance upper 5 → audio circuit 15 → speaker 16. In addition, the sound from the child device K side to the parent device P side is microphone 14 → audio circuit 15 → impedance upper 5 → two lines A1 and A2.
The signal is transmitted through the route of the space → the impedance upper 7 → the voice circuit 12 → the speaker 13.

Reference numeral 17 is a power supply circuit on the base unit P side, and 18 is an AC adapter. Regarding the flow of the power supply a from the parent device P to the child device K, AC 100 V is
After being converted into the C voltage, it is converted into a constant voltage by the power supply circuit 17. The constant voltage power supply created here serves as a power supply for each circuit in the parent device P, and also serves as a power supply a for the child device K, which is output between the two wires A1 and A2 via the impedance upper 7.

The voltage output between the two lines A1 and A2 differs between the standby state and the operating state. The standby state is a state in which a visitor appears and waits for an image pickup / communication to start, and the operating state is a standby state in which the call button 19 of the handset K is pressed and a first call signal d1 described later is generated. After being sent, it is assumed that imaging and talking are being performed.

It has been empirically confirmed that the time required for imaging and talking is not too long because of the visitor's response. Therefore, normally, after switching from the standby state to the operating state, for example, two minutes later, the original standby state is restored. Switching between the standby state and the operating state is performed by the master unit side control circuit 20 provided in the master unit P, and the power supply control signal g output from the master unit side control circuit 20 causes the two lines A to enter the standby state.
A low voltage of 6 V is output between 1 and A2 in the high output impedance state, and a high voltage of 15 V is output in the low output impedance state in the operating state.

In the operating state, both the parent device P and the child device K
Power is supplied to all circuits, and all circuits are operating. However, in the standby state, almost all circuits on the handset K side are in an inoperable state, and a function to send the first call signal d1. Only will be operational. Further, in the standby state, the transistor 21 is turned off also on the parent device P side, so that the FM demodulation unit 8, the video signal processing circuit 9, and the audio circuit 12 are provided.
The power supply to the circuit is stopped, and the operation of these circuits 8, 9 and 12 is also stopped. In this way, the power consumption is reduced by stopping the operation of the circuit that is not needed in the standby state.

The power source a supplied to the slave unit K from between the two wires A1 and A2 is input to the power source circuit 6 through the impedance upper 5, and is converted to a constant voltage in the operating state, and each unit in the slave unit K is operated. The power supply a is supplied to the circuit and the power supply circuit 6 supplies power to the energization display LED 22 and the infrared LED 23, and the LEDs 22 and 23 are turned on.

In the standby state, the power supply a is the power supply circuit 6
Input to the LEDs 22, 2 from the circuit 6
No output to 3. However, as described above, call button 1
When 9 is pressed, it is necessary to send the first call signal d1. Therefore, the slave unit side control circuit 24 connected to the call button 19 has a high output impedance from the master unit P via the impedance upper 5, Low voltage power is input.

When the call button 19 is pressed while the constant voltage from the power supply circuit 6 is input, the slave unit side control circuit 24 sends out the second call signal d2. Further, when the call button 19 is pressed in a state where there is no constant voltage input from the power supply circuit 6 in the standby state and the high output impedance and low voltage power source is input from the impedance upper 5,
The first call signal d1 is transmitted.

FIG. 2 shows the first call signal d1. First
The call signal d1 is a call signal for switching from the standby state to the operating state, and is output when the visitor first presses the call button 19. As indicated by reference numeral (1) in FIG. 2, when the call button 19 is pressed in the standby state, the first call signal d1 causes the high impedance and low voltage power source output from the parent device P to be short-circuited for a moment and then the two lines. The voltage between A1 and A2 is momentarily dropped from 6V to 3V, for example, and then transmitted.

Then, on the side of the parent device P, two lines A1, A
The voltage monitor circuit 25 interposed between the two wires A
When a drop between 1 and A2 is detected, a low output impedance and a high voltage are output between the two wires A1 and A2 as shown by reference numeral (2), and the power supply to all circuits in the parent device P is turned on. At the same time, a chime sound is output from the master unit side control circuit 20 and a chime sound is emitted from the speaker 26.

As described above, when the first call signal d1 is transmitted from the voltage monitoring circuit 25 to the master unit side control circuit 20, the master unit side control circuit 20 controls the power supply circuit 17 at the same time, so that the slave unit K Power supply a to the high impedance,
The low voltage (for example, 6 V) is switched to the state of low impedance and high voltage (for example, 15 V), and the power a is supplied to all circuits of the child device K. In this way, the image pickup by the child device K, the image display by the parent device P, and the call between the parent device P and the child device K become possible.

FIG. 3 shows the second calling signal d2. Second
The call signal d2 is a call signal in the operating state, and is output when the call button 19 is pressed again, such as when the visitor does not answer even if the call button 19 is pressed. That is, when the call button 19 is first pressed, the standby state is switched to the operating state as described above, so that the calling button 19 is pushed a second time in the operating state.

As shown in FIG. 3, this signal needs to be output in a state in which the video signal FM carrier c is continuously output in the operating state.
As shown in (3) and (4), it is sent by turning off only a part. However, if the FM carrier c is partially turned off during image display, the image is disturbed. Therefore, it is desirable to limit the periods (3) and (4) for turning off the FM carrier c during the vertical blanking period of image display.

Returning to FIG. 1, on the slave K side, the vertical reference signal h input from the video signal processing circuit 3 to the control circuit 24 is for creating the timing.

On the side of the base unit P, a part OF of the FM carrier c
The F signal is detected by the FM demodulation unit 8 and the second calling signal d2 is detected.
Is input to the control circuit 20. When the second calling signal d2 is input, the control circuit 20 outputs a chime sound and causes the speaker 26 to sound the chime sound.

FIG. 4 shows the appearance of the child device K used in this embodiment. As shown in this figure, in the lower half of the child device K, the microphone 14, the speaker 16, and the electricity display LE are displayed.
A D22 and a call button 19 are arranged facing the front.

Further, a rectangular light receiving window 28 is arranged in the upper half of the child device K. The lens 1 and two pairs of infrared LEDs 23 arranged on both sides of the lens 1 face the light receiving window 28, and the front surface of the window 28 is covered with a filter 28a.

The filter 28a is colored so that the lens 1 and the infrared LED 23 in the light receiving window cannot be seen from the outside, and the visible light is 50% by the filter 28a.
The degree is cut. Further, since the filter 28a has a transmittance of almost 100% for infrared light, it does not affect infrared light. A tilt prevention guide 29 including a pair of protrusions parallel to the light receiving window 28 is attached to a front portion of the child device above and below the light receiving window. The tilt prevention guide 29 is the secret card 27.
The posture and the moving direction of are regulated.

FIG. 5 shows an example of the secret card 27. The secret card 27 has a bar code-like pattern 27b which functions as a secret signal on the surface of a card body 27a made of rectangular white paper or the like cut into a size corresponding to the size of the light receiving window 28. Further, the barcode-like pattern 27b can be easily created so that it can be arbitrarily written on a paper surface by using a black felt pen or the like, and can be created and changed relatively easily by the user. Is.

In general, the camera of the child device K is adjusted so as to focus about 50 cm in front of the lens 1, so that when the secret card 27 is brought into close contact with the front filter 28a, the camera is out of focus. However, the card 27
Is a barcode-like pattern 27b on the surface of the white card body
Since it is drawn in black, only the black and white pattern needs to be identified. Therefore, if the minimum pattern width b of the barcode-like pattern 27b is set to a size sufficient for identification, the identification can be performed even in the out-of-focus state when the card 27 is pressed closely against the filter 28a.

However, if the minimum pattern width b is set to be much larger than the recognizable dimension in order to improve the discriminating property, the easiness of creating the barcode-like pattern is greatly improved, but the pattern itself becomes monotonous and the secret property is reduced. It will be inferior. As a countermeasure, for example, as shown in FIG.
Two or more different bar code rows are arranged in the vertical direction so that each bar code row can be confirmed.

Even if the barcode-like patterns are arranged in a plurality of rows in the vertical direction, the secret card 2
By pushing 7 along the inclination prevention guide 29 of the child device K, the upper and lower sides thereof are not mistakenly identified.

When the barcode-like pattern 27b drawn on the secret card 27 is read through the lens 1, the card 27 is brought into close contact with the front filter 28a along the tilt prevention guide 29. As a result, when the surface of the card 27 on which the barcode-like pattern 27a is drawn is pressed against the filter 28a, the front surface of the lens is completely shielded by the card 27, so that external light is incident on the lens 1. Instead, only the barcode-like pattern 27b illuminated by the infrared LED 23 is imaged.

Next, the function for locking / unlocking the electric lock, which is added to the basic function as the intercom of the present embodiment, will be described by taking as an example the one having the following function settings. In this description, the secret signal related to the barcode-like pattern 27b by the secret card 27 will be referred to as the first secret signal k1, and the secret signal related to the number of times the call button 19 is pressed and the timing will be referred to as the second secret signal k2.

The method of inputting the secret signal in the child device K and the identification in the parent device P is performed by the secret signal input method selection switch 30 as a selecting means provided in the parent device P by using the first secret signal k1 and the second secret signal. The combined method of the signal k2, that is, the identification by the first secret signal k1 is first performed, and after confirming that it matches the registered pattern, the identification by the second secret signal k2 is performed.

Regarding the first secret signal k1, the input of all patterns on the secret card 27 is the lens 1
Since the angle of view of is small, the object that cannot be performed by merely pressing the lens 1 is targeted. Therefore, the input and registration operations are performed while the card 27 is reciprocally moved along the front end surface of the camera lens.

Regarding the second secret signal k2, the identification method is as follows: the call button 1 after entering the input mode.
9 counts the number of short presses (the number of ON times <2 seconds), and the count value until it is detected that it has been pressed for a long time (ON time ≧ 2 seconds) is the call button input in the parent device P. The method is determined by whether or not it matches the value set by the number-of-times setting switch 31.

The display or notification of the input mode at the time of inputting the secret signal and the display or notification for confirming the locking / unlocking operation of the electric lock are the energization display LED 2 of the child device K.
It shall be done in 2.

Reference numeral 32 denotes a tone decoder provided in the child device K as necessary, which is used to turn on / off the energization display LED 22.
The tone decoder 32 is for controlling the OFF, and the tone decoder 32 is not necessary when the speaker 16 notifies it.

Returning to FIG. 1, the first and second secret signals k1 and k2, the tone signal m, and the notification sound n are added between the two lines A1 and A2 as transmission signals from the slave K to the master P. ing. The first and second secret signals k1 and k2 are the same in form as the video signal e and the second calling signal d2, respectively, and are distinguished by the master unit side control circuit 20, specifically by the software of the internal microcomputer. Is
The circuit 20 processes the first and second secret signals k1 and k2.

The first secret signal k1 is the lens 1 → C
CD2 → Video signal processing circuit 3 → FM modulator 4 → Impedance upper 5 → Between two lines A1 and A2 → Impedance upper 7 → FM demodulator 8 → Bandpass filter (hereinafter referred to as BPF) 33 → Comparator 34 → Parent It flows in order of the machine side control circuit 20.

The BPF 33 is provided in order to distinguish the difference between the image waveform at the time of normal image pickup and the image waveform at the time of secret card image pickup by the difference in its frequency component, and its output is digitalized by the comparator 34. It is converted by a signal and read by the microcomputer in the master unit side control circuit 20. In this case, the waveform at the time of normal imaging may have some output even after passing through the BPF 33, may be converted into a digital signal by the comparator 34, and may be input to the master unit side control circuit 20, but this may occur. It is removed by the processing of the internal microcomputer.

The comparator 34 is a comparator with hysteresis, and the width of the hysteresis is controlled by the output of the master unit side control circuit 20. The comparator 34 compares the output (peak and valley of the waveform) of the BPF 33 with the level obtained by averaging it, and is composed of a circuit as shown in FIG. 6, for example.

In FIG. 6, the analog switch 35 is turned on by the hysteresis width control signal p from the master side control circuit 20.
When N, the resistors R1, R2 and R3
When the analog switch 35 is off, the resistance R1
And the resistance R2 determines the hysteresis width. The reason for changing the hysteresis width is to check the level of the output (peak and valley of the waveform) of the BPF 33, which is used to detect the dirt on the secret card 27 and the front filter 28a of the handset K.

FIG. 7 shows the secret card 2 shown in FIG.
7 shows a video signal waveform when the barcode-like pattern 27b of 7 is imaged and a waveform after processing. 7A and 7B are video signal waveforms corresponding to the imaged two-stage bar code-like pattern 27b. The waveform (A) is the upper pattern portion of the pattern 27b, and the waveform (B) is the same as the above. It corresponds to the side part. Waveform (C) passes video signal waveform (A) through BPF 33,
This is a waveform after extracting only the frequency component relating to the barcode-like pattern 27b and removing the unnecessary frequency component.

The center frequency of the BPF 33 is determined according to the minimum pattern width of the barcode-like pattern 27b.
The waveform (D) is a waveform obtained by converting the waveform (C) into a digital signal by the comparator with hysteresis 34. The "H" level corresponds to black and the "L" level corresponds to white. By changing it, the level of the waveform (C) can be checked.

That is, as illustrated in FIG. 8, the levels of the peaks (a) (c) (e) (g) and the valleys (b) (d) (f) in the waveform (C) by the comparator 34, Level averaged from waveform (C)
(o) is compared, and when the hysteresis width is small, for example, as shown by the width A, the peaks (a) (c) in the waveform (C) are compared.
(e) (g) and valleys (b) (d) (f) are all detected and a digital signal is output. For example, as shown by width B, when the hysteresis width is large, the peaks in waveform (C) are large. (c) will not be detected.

Initially, even when the hysteresis width = B, all peaks (a) (c) (e) (g) and valleys (b) (d) (f) in the waveform (C).
If it is detected, it is considered that this is caused by the dirt on the front filter 28a of the secret card 27 or the handset K, and it is detected when the hysteresis width = A, but not when the hysteresis width = B. Performs an electric lock / unlock operation, but at the same time, if the notification sound n is output from the speaker 16 of the child device K, the operation reliability is maintained.

The left and right movements of the pulse trains of the waveform (C) and the waveform (D) are also identified. Specifically, the position of the pulse train of the waveform (D) is checked for each field, and the pulse train is either left or right. It is detected whether it is moving in the direction of, and the pulse train is complemented according to the movement. If you do this,
Even when all the barcode-like patterns 27b on the secret card 27 cannot be imaged at one time because the angle of view of the lens 1 is small, all the patterns can be recognized by moving the secret card 27.

FIG. 9 shows a case where only a part of the pulse train of the waveform (D) in FIG. 7 can be detected in the camera in which the angle of view of the lens 1 is small. In the pulse train (1) of FIG. 9, the "black" at the right end cannot be detected in the pulse train of the waveform (D) of FIG. 7, but the pulse train moves to the left by checking the position of the pulse train for each field. Have identified that. After that, by detecting the pulse train (2) in FIG. 9, the entire pulse train can be recognized for the first time at this point, and the electric locking / unlocking operation is performed.

Registration of the barcode-like pattern 27b on the secret card 27 can be performed by the same method as when the electric lock / unlock operation is performed. That is, the parent device P may be set to the registration mode and the barcode-like pattern 27b may be pressed against the lens front filter 28a of the child device K. The first secret signal k1 based on the registered barcode-like pattern 27b is the EEPROM 3 built in the parent device P.
8 is written in a non-volatile memory. This memory is rewritable, and the user can easily change the contents thereof, that is, the contents of the first secret signal k1.

Returning to FIG. 1, the flow of the second secret signal k2 is exactly the same as the flow of the second call signal d2, and both softwares k2 and d2 are positioned by the software of the microcomputer in the master side control circuit 20. Only distinguish. When using the call button 19 of the child device K, the second call signal d2 in the operating state of FIG. 3 is used. The operating state is a state in which all circuits of both the parent device and the child device K are energized and all circuits are operating, and a calling operation in this state is also necessary and is used.

For example, the following operation is performed. When the call button 19 is held longer than usual in the operating state, the second secret signal k2 by the call button 19 is held.
Enter the input mode of. The fact that the input mode has been entered is displayed by switching the energization display LED 22 from lighting to blinking. After that, the call button 19 is pressed again, and if the number of times and the timing match the preset number of times and the timing, the electric lock / unlock operation is performed. That is, this means that the secret signal is input and identified according to the number of times the call button 19 is pressed and the timing.

The secret card 2 is used in this embodiment.
7. A method of identifying the barcode-like pattern 27b on 7 and
Two types of methods of identifying the secret signal, that is, the number of times the call button 19 is pressed and the method of identifying the timing are used together, but in addition, the selection switch 30 provided on the master device P side selects one of the two methods. Depending on the situation, it is possible to select which identification method is used, or to use both methods in order to enhance the secret property.

In the present embodiment in which both are used together, the barcode-like pattern 27b on the secret card 27 is identified, and after confirming that it matches the registered pattern, the second secret key signal k2 is input by the call button 19. Enter the mode. Thereafter, the electric lock is locked / unlocked only when the number and timing of pressing the call button 19 coincide with the preset number and timing, so that the safety can be further enhanced.

Display or notification for confirming the registered secret signal and confirmation of registration completion at the time of registration of the first secret signal k1 by the secret card 27, and display of the input mode when the secret signal is input to the secret card and the call button. (The display or notification of the input mode when the secret signal is input by the call button is, for example, blinking as described above), or the display or notification for confirming the operation at the time of electric locking / unlocking is the energization of the handset K. The display LED 22 and the built-in speaker 16 are used.

Reference numeral 36 denotes a tone generator which receives the output of the master unit side control circuit 20 in the master unit P and outputs a tone signal m and an alarm sound n. The tone signal m and the notification sound n are both signals with a single frequency of 500 to 10 kHz, and the flow of the signal is almost the same as that of the voice signal b transmitted from the parent device P to the child device K. Depending on their roles, the tone signal m and the notification sound n have frequencies in the inaudible band and the latter in the audible band. However, the form is the same, and the former is input to the tone decoder 32 to turn on / off the power-on display LED 22. O
Control FF. The latter is output from the speaker 16 like voice.

In addition, what is added to the basic structure of the intercom is a secret signal input method selection switch 30 for selecting the secret signal 1 or the secret signal 2 or the combination of the above, and the second secret signal.
In addition to a call button input count setting switch 31 for setting the number of times the call button 19 is pressed in k2, a registration switch 37 for registering the first secret signal k1, an EEPROM 38 for storing a registration pattern, and an electric lock. / The coils 56 and 57 for unlocking.

Further, the sync signal q, which has been sync-separated from the video signal processing circuit 9, is inputted to the master unit side control circuit 20. This is a video signal e due to the processing of the internal microcomputer.
Since it is necessary to discriminate the field and the horizontal line in, the process of checking the output of the comparator 34 for each even field is performed.

10 to 13 are flowcharts of the processing for identifying the inputs of the first and second secret signals k1 and k2. Specifically, it corresponds to the processing of the internal microcomputer of the master unit side control circuit 20. In FIG. 10, the secret signals k1 and k2 are input to the master device P.
And the operating state of the child device K, that is, the state in which all circuits are energized (step S1).

In this operating state, the first secret signal k1 is input (step S2). In step S2, when the first secret signal k1 is input, the synchronization signal q input separately is detected, and then the timing is changed. I also try to input at the same time. Then, it is checked whether or not the input pulse train partially matches the registered pulse train (step S3).

At this time, in order to prevent misinterpretation of the pulse train based on the video signal waveform at the time of normal image pickup, it is determined that "a pulse train partially matches the registered pulse train" is "0.5 horizontal period". "The included pulse trains must match." The pulse train determined to partially match the registered pulse train is written in the memory A and the memory B (step S4), and the energization display LED 22 is caused to blink slowly (step S5) as a display operation to that effect. This display serves to encourage the operator to move the secret card left or right.

When the first secret signal k1 is input (step S6), the input pulse train is written in the memory C (step S7), and the moving direction of the pulse train is determined by comparing the contents of the memory C and the memory B (step S8). Memory B
Is for determining whether the pulse train is moving to the left or right by comparing with the memory C to which the subsequent input pulse train is written, and the memory A stores the newly matched pulse train according to the movement of the pulse train. And add
This is to confirm whether or not everything matches the registered pulse train.

Turning to FIG. 11, (memory A) ← (memory A) ∪ (memory C) in step S9 does not mean simply “OR”, but the matched pulse trains in memory C are successively stored in memory A. It means adding. And
In step S10, if the registered pulse train and the content of the memory A match, the display operation to that effect indicates the energization display LED 2
2 is made to blink rapidly (step S12) to notify that the second secret signal k2 is in the input mode, that is, waiting for the input of the call button 19.

Before that, the comparator 34 is controlled to increase its hysteresis width and raise the threshold level for the output of the BPF 33 (step S1).
3). If the pulse train obtained at this time is different from the pulse train before increasing the hysteresis width (step S1
5) An alarm sound n is output from the speaker 16 of the child device K (step S16) to warn that the secret card 27 or the front filter 28a of the child device K is dirty.

Moving to FIG. 12, after step S17 and the second secret signal k2 input mode,
The signal level is determined (step S19). The input waveform of the second secret signal k2 is the same as that of the second calling signal d2 shown in FIG. 3, and its active signal (Low level) is output during the blanking period of the video signal e.

At the time of inputting the second secret signal k2 in steps S18 and S21, the first secret signal k2 in steps S2 and S6 is input.
Similar to the case of inputting the secret signal k1, since the input is performed in synchronization with the separately input synchronizing signal q, the "H" level or "L" level of the second secret signal k2 can be detected. The same processing at the time of inputting the first secret signal k1 in steps S2 and S6 means waiting for the beginning of the field before starting the input, and is also for detecting the difference for each field.

In step S19, the second secret signal k2
When the "L" level is detected, the number N of times of detection is counted (step S20). Then, the operation waits until the operation of pressing the call button 19 indicating the end of the input of the second secret signal k2 for 2 seconds or more, that is, until the "L" level of the second secret signal k2 continues for 2 seconds or more.

In step S25, M of M = 120 represents the duration of the "L" level of the second secret signal k2, and 1 field = 1/60 seconds. Therefore, 1/60 × 120 =
2 seconds. In this way, when the "L" level of 2 seconds or more is detected, the last "L" level is not counted, so-
It is set to 1 (step S26), the process moves to FIG. 13, and it is checked whether or not the number of detections N of the "L" level matches the set value (step S27). If they match, the electric lock is locked / unlocked. Output for.

At the same time, the energization display LED 22 is also controlled, and is turned on when locked and turned off when unlocked to return to the original operating state. It should be noted that in the operating state, the energization display LED
Since 2 is in the continuous lighting state, the turn-off operation indicating unlocking is 5
Only for a second, after which it will be lit.

[0111]

As described above, according to the present invention, the secret signal input means for inputting the secret signal for the electric lock and / or the unlock using the camera of the child device is additionally provided. But this secret signal input
The means is based on the position of the visitor that the visitor monitoring camera captures.
So that the secret pattern can be imaged at a position close to
On the other hand, on the other hand, since it is assumed that the master unit is provided with an identification means for identifying whether the secret signal is correct or not, the appearances of the master unit P and the slave unit K in the conventional TV doorphone hardly change, and the internal circuit blocks are By adding only a few blocks, it is possible to add a function for locking / unlocking an electric lock while maintaining the same function as a conventional TV door phone, and it is possible to improve appearance, space, wiring, and economy. There is a very big advantage.

In the present invention, it is mainly described that the electric lock is locked / unlocked by the image recognition method for the secret card, but the same idea can be applied to a camera other than the TV intercom. Note that it is also possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a slave K and a master P in a TV intercom system with an electric lock / unlock function.

FIG. 2 is an explanatory diagram of a first call signal in a standby state.

FIG. 3 is an explanatory diagram of a second calling signal in an operating state.

FIG. 4 is an external view of a child device according to an embodiment of the present invention.

FIG. 5 is an external view showing an example of a secret card.

FIG. 6 is a circuit diagram showing an example of a comparator with hysteresis.

FIG. 7 is a waveform diagram showing a waveform of a video signal e and a processed waveform thereof when a secret card is imaged.

FIG. 8 is a waveform diagram showing a process of changing the hysteresis width by the comparator with hysteresis.

FIG. 9 is an explanatory diagram of pulse train recognition in which horizontal movement of the pulse train corresponding to the first secret signal is detected and the movement is added.

FIG. 10 is a flowchart of the process of inputting and identifying the first and second secret signals.

11 is a continuation of the flowchart of FIG.

FIG. 12 is a continuation of the flowchart of FIG. 11.

FIG. 13 is a continuation of the flowchart of FIG.

FIG. 14 is a block diagram of a slave unit and a master unit in a conventional TV doorphone.

FIG. 15 is a block diagram of a secret signal input device and a controller in a conventional electric lock / unlock system.

[Explanation of symbols]

1 lens 2 CCD 10 CRT 15 Voice circuit 16 speakers 19 Call button 20 Master side control circuit 22 Power indicator LED 23 Infrared LED 24 Remote unit side control circuit 27 secret cards 27b barcode-like pattern 28a filter 29 Tilt prevention guide 30 Secret signal input method selection switch 31 Call button input count setting switch 56 electric lock coil 57 Electric unlocking coil K child machine P base unit

   ─────────────────────────────────────────────────── ─── Continued front page       (56) References Japanese Patent Laid-Open No. 53-56928 (JP, A)                 JP 63-118473 (JP, A)                 Japanese Patent Laid-Open No. 5-30255 (JP, A)                 Actual development Sho 61-29580 (JP, U)                 Actual Kaihei 2-36577 (JP, U)                 63-187458 (JP, U)

Claims (5)

(57) [Claims] 1. A cordless handset having a call button, means for transmitting a call signal output from the call button, a visitor monitoring camera, and means for transmitting a video signal output from the camera; In an intercom consisting of a base unit having a TV monitor for displaying a video image picked up by the camera based on a video signal of a video signal sending means, an electric lock and / or unlock using a call button of the slave unit or a camera. while attaching a secret signal input means for causing the input of the secret signal for the lock, the bar code-like pattern and attached identification means for identifying a right or wrong of the secret signal to said master unit, corresponding to the secret signal
While preparing the secret card with the
The clet signal input means is provided on the front end face of the camera lens with the aforementioned seal.
Pattern of the Klett card in close contact
That can be resolved and that also serves as a visitor monitoring camera.
It is composed of a camera, and the identification means is imaged by the camera.
Compare and compare the pattern of the card that was printed with the registered pattern
By identifying whether the secret signal is correct or not.
Is configured to, bar code-like pattern of the secret card Car
Bar code string that can be arbitrarily entered in the main body
Electric locking / locking formed by arranging a plurality of stages
TV door phone with unlocking function. 2. A call button, output from the call button
Calling signal sending means, a visitor monitoring camera, and
Handset provided with means for transmitting video signal output from camera
Based on the video signal of the video signal transmission means of the slave unit,
TV monitor that displays video captured by the camera
An intercom consisting of a base unit having a
Use the call button or camera to lock and / or lock the electric lock
Or a secret signal for unlocking is input.
The parent device is provided with a clelet signal input means.
Is equipped with identification means for identifying whether the secret signal is correct or not.
Set, and the one which the bar code-like pattern corresponding to the secret signal to prepare the secret card is entered, secret signal input means the pattern of the card is resolved in the state of being closely the secret card in the camera lens front surface It is possible and comprises a camera that also serves as a visitor monitoring camera, and the identifying means identifies the correctness of the secret signal by comparing and comparing the pattern of the card imaged by the camera with a registered pattern. is configured, the secret card in close proximity to the camera lens front surface
Shape and dimensions that can shield the front end surface of the camera lens in the closed state
It is formed on a flat surface with a law,
The barcode pattern written on the secret card
Infrared LED for night illumination as a lighting means for imaging
A TV door phone with a built-in electric lock / unlock function. 3. A call button, output from the call button
Calling signal sending means, a visitor monitoring camera, and
Handset provided with means for transmitting video signal output from camera
Based on the video signal of the video signal transmission means of the slave unit,
TV monitor that displays video captured by the camera
An intercom consisting of a base unit having a
Use the call button or camera to lock and / or lock the electric lock
Or a secret signal for unlocking is input.
The parent device is provided with a clelet signal input means.
Is equipped with identification means for identifying whether the secret signal is correct or not.
Set the barcode pattern corresponding to the secret signal
While preparing the secret card with the
The clet signal input means is provided on the front end face of the camera lens with the aforementioned seal.
Pattern of the Klett card in close contact
That can be resolved and that also serves as a visitor monitoring camera.
It is composed of a camera, and the identification means is imaged by the camera.
Compare and compare the pattern of the card that was printed with the registered pattern
By identifying whether the secret signal is correct or not.
The secret card along the front end surface of the camera lens.
Image the barcode pattern while reciprocating.
Card that detects the movement of the card when
TV intercom with electric lock / unlock function equipped with movement detection means . 4. A call button, output from the call button
Calling signal sending means, a visitor monitoring camera, and
Handset provided with means for transmitting video signal output from camera
Based on the video signal of the video signal transmission means of the slave unit,
TV monitor that displays video captured by the camera
An intercom consisting of a base unit having a
Use the call button or camera to lock and / or lock the electric lock
Or a secret signal for unlocking is input.
The parent device is provided with a clelet signal input means.
Is equipped with identification means for identifying whether the secret signal is correct or not.
Set the barcode pattern corresponding to the secret signal
While preparing the secret card with the
The clet signal input means is provided on the front end face of the camera lens with the aforementioned seal.
Pattern of the Klett card in close contact
That can be resolved and that also serves as a visitor monitoring camera.
It is composed of a camera, and the identification means is imaged by the camera.
Compare and compare the pattern of the card that was printed with the registered pattern
By identifying whether the secret signal is correct or not.
And the posture of the secret card on the front end face of the camera lens.
And / or guide means for regulating the moving direction are provided.
There Ru electric lock locking / unlocking function with TV door. 5. A call button, output from the call button
Calling signal sending means, a visitor monitoring camera, and
Handset provided with means for transmitting video signal output from camera
Based on the video signal of the video signal transmission means of the slave unit,
TV monitor that displays video captured by the camera
An intercom consisting of a base unit having a
Use the call button or camera to lock and / or lock the electric lock
Or a secret signal for unlocking is input.
The parent device is provided with a clelet signal input means.
Is equipped with identification means for identifying whether the secret signal is correct or not.
Set the barcode pattern corresponding to the secret signal
While preparing the secret card with the
The clet signal input means is provided on the front end face of the camera lens with the aforementioned seal.
Pattern of the Klett card in close contact
That can be resolved and that also serves as a visitor monitoring camera.
It is composed of a camera, and the identification means is imaged by the camera.
Compare and compare the pattern of the card that was printed with the registered pattern
By identifying whether the secret signal is correct or not.
And the bar written on the secret card from the camera
When an imaging of the code-like pattern, the front window of the camera lens or
Also, due to dirt on the card itself, the secret signal may
Installed in the handset when the corresponding video signal level drops
Image defect notification means to notify by voice from speaker
Electricity is provided with a lock locking / unlocking function with TV door.