JPS6226382B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an intercom system with a door unlocking function. 2. Description of the Related Art Conventionally, door unlocking devices using a personal identification number using numeric keypad buttons 0 to 9 have been known.
In this case, if this and a numeric keypad type intercom are not installed together, there will be two sets of numeric keypad buttons, which will not only complicate the installation but also improve operability.
There were also aesthetic issues. The present invention has been made to solve the above-mentioned conventional problems, and is connected via an intercom line to intercom handsets installed in each of a plurality of rooms isolated from the entrance via a door, and 0-9 on the intercom base installed at the entrance.
A ten-key switch and a start switch are incorporated, and a station number signal for the handset and an unlock signal for the door are selectively generated based on the difference in the operating order of the ten-key switch and the start switch, and these signals are converted into a binary code. This control device discriminately detects the coded and transmitted station number signal and unlock signal, performs a channel selection function according to the station number signal, and connects the base unit and the station number signal. A calling/talking circuit is formed with the handset corresponding to the area number signal via the intercom line, and an unlocking function is performed in response to the unlocking signal, and the circuit is set in advance with the unlocking signal. It is an object of the present invention to provide an intercom system with an unlocking function, which generates a drive signal to unlock the door when the entered personal identification number matches the entered password. Hereinafter, preferred embodiments of the present invention will be explained in detail with reference to the drawings. In FIG. 1, SUB1, 2, 3, etc. are intercom handsets installed in a plurality of living rooms separated from the entrance of an apartment complex through a door. The handset is equipped with a transmitter and receiver,
For convenience, it is not shown. Intercom line L
The base unit 2 connected via
It incorporates ten key (push button) switches SW _{0 to 9} , a call (push button) switch SW call as a start switch, and an end key (push button) switch SW end. Signals from these switches are sent out to line L via signal transmission circuit 5. The base device is also provided with amplifiers A ₁ and A ₂ that amplify the audio signal to the speaker SP and the audio signal from the microphone M, respectively. The control device 3 is controlled by a signal receiving circuit 6 for receiving a signal from a signal transmitting circuit 5, a control section 8 that receives signals from the receiving circuit 6 and a password setting switch 7, and a control section 8. , a channel selection circuit 9 and an unlocking relay 10 for energizing the electric lock or automatic door unit 4. The end key switch SW end is used to clear the previously pressed data, for example, when correcting a mistake in pressing a number on the ten key switch SW _{0 to SW9} . Now, on base unit 2, the numeric keypad switch
When you press the station number of your room using SW _{0 to 9} , the signal transmitting circuit 5, line L, and signal receiving circuit 6 operate the control unit 8, the channel selection circuit 9 performs the channel selection function, and the slave unit SUB1 , 2, 3, etc., and can call and talk to each other. When the door unlocking number is pressed on the same switch, the control unit 8 determines whether the number matches the password set in advance on the switch 7, and if it is correct, it energizes the unlocking relay 10. The door can be opened by driving the electric lock or automatic door unit 4. FIG. 2 is a circuit diagram showing an example of the signal transmitting circuit 5 in the base unit 2 shown in FIG. In FIG. 2, a call key switch as a start switch is connected to a parallel-to-serial converter circuit 12 via OR circuits 14, 16, 17 and input lines l' ₁ , l' ₄ , l' ₃ . The termination key switch is also connected to the conversion circuit 12 via OR circuits 14 and 17 and input lines l' ₁ and l' ₃ .
The conversion circuit 12 includes a shift register and a capacitor.
Cf, and an oscillator with a frequency determined by a resistor Rf. Ten key switches 0 to 7 are connected to an encoder 13. The encoder 13 has three output lines _l2 to _l4 , namely 3
It generates a bit binary code signal.
Number 8 of the ten key switch is connected to the input line l' ₁ of the conversion circuit 12 via the OR circuit 14.
Further, switch No. 9 is connected to input lines l' ₁ and l' ₄ via OR circuits 14 and 16. In addition,
The inverter 15 outputs some signals on the lines _l2 to _l4 from the encoder 13 to the conversion circuit 12 via the line _l1 when the switch No.8 or No.9 is pressed. This is to prevent If such a circuit is used, 8-bit input, 3
Bit output encoder 13 and OR circuit 14,1
6, 17 and the inverter 15, 0 to 9,
A total of 12 switch inputs for call and termination can be logically converted, for example, as shown in the following table.

[Table] If you press the switches 0 to 9, end, and call in sequence, encoder 13, OR circuits 14, 16, 1
7. The binary code conversion circuit of the inverter 15 applies a signal coded as shown in the previous table to the parallel input terminal of the conversion circuit 12. The conversion circuit generates a serial output signal at a transmission frequency determined by a capacitor Cf and a resistor Rf.
This signal is sent to line L via a line driver formed by transistor Tr1. In this way, each switch is transmitted as a signal encoded in a binary code, and by combining these signals, it is possible to generate a station number signal for the slave unit in the room and a signal for unlocking the door. By the way, when the unlock signal and the station number are pressed on the same numeric keypad, if the station number and the unlock number match, it becomes difficult to tell them apart. Therefore, the following differences are made in the operating order of the key switches. That is, for example, when selecting a slave unit having station number 1234, press the station number in the order of 1→2→3→4→call, and then press the call switch. On the other hand, for example, to unlock the door when the password is set to number 1234, press the unlocking number after pressing the call switch in the order of call → 1 → 2 → 3 → 4. In this way, the area number signal and the unlock signal are distinguished by pressing the call switch as the activation switch after or before the ten key switch is pressed. Next, an example of the control device 3 (FIG. 1) that processes signals based on the binary codes distinguished in this way will be described with reference to FIG. 3. In FIG. 3, line L represents comparator 2
0, a decoder 21, a serial/parallel conversion circuit 22, and a tristate buffer 23, which are connected to a central processing unit (CPU) 24. Further, the output thereof is configured to be applied via a latch 25 and a buffer 26 to transistors Tr 2 to Tr ₅ connected to relays Ry _{1 to 4} , respectively. Now, the station number signal or unlock signal received from line L is waveform-shaped by comparator 20 and applied to decoder 21. This decoder 21 supplies a clock to the shift register 22 at the receiving frequency (corresponding to the above-mentioned transmission frequency) determined by the capacitor Cf and the resistor Rf, and fixes the received data signal to the shift register 22. Further, this decoder 21 has a function of clearing the shift register 22, and when a received signal is received, a request signal is sent to the decoder 21.
REQ is sent to the central processing unit (CPU) via the inverter 27, capacitor C, flip-flop 28, inverter 29, and tristate buffer 23.
It functions to supply to 24. After the central processing unit 24 finishes reading data from the buffer 23, it applies a reset signal (RESET) to the flip-flop 28. This data is read into the central processing unit 24 via the buffer 23. By the way, as described above, this data is sent in a manner that distinguishes between the area number signal and the unlock signal depending on whether the call switch is pressed after or before the ten key switch is pressed, for example. Therefore, the central processing unit 24 executes a program subroutine as shown in FIG. That is, when the call switch is pressed at the leading edge of the data, if the data "1011" shown in the table above is detected, the unlocking process is performed, and on the other hand, if this is not the case, the channel selection process is performed. . In this way, the coded and transmitted station number signal and unlock signal are discriminated and detected by the central processing unit 24. Then, the unlocking function is performed in response to the unlocking signal, and when the unlocking signal matches the password set in advance and stored in the central processing unit 24, data is output to the latch 25. Then, it generates a drive signal to unlock the door via buffer 26 and transistors Tr _{2 to} Tr 5, energizes relays Ry 1 to 4, and turns on the relay contacts to unlock the electric lock or activate the automatic door unit. Drive 4. In addition, when a station number signal is detected, the station selection function is performed and the base unit 2 and the slave unit corresponding to the station number signal
A calling and talking circuit is formed with any of the SUBs 1, 2, 3, . . . via an intercom line L. FIG. 5 shows another embodiment in which the control device 3 (FIG. 1) discriminately detects the station number signal and the unlock signal. In the figure, _S1 to _S4 are password setting switches, _X1 to _X4 are exclusive OR circuits, and A10 is an AND circuit. Tr is a transistor that drives relay Ry that energizes an electric lock or automatic door. Binary code data line 3 explained in the previous embodiment
0 is applied to the exclusive OR circuits _X1 to _X4 together with the outputs of the password setting switches _S1 to _S4 . In the example shown in Figure 5, the password is “1001” = 9
is set to . The line 30 is also connected to the exclusive OR circuits X ₅ to _{X 8} and the central processing unit 31 . At the same time, other inputs, "1011"=11 in the illustrated example, are applied to each of these OR circuits _X8 to _X5 . Therefore, the binary code signal generated in response to the call key switch is determined to be "1011". A20 is
In the AND circuit, when all its inputs are at low level, the call request signal CREQ is sent to the central processing unit 3.
Give to 1. IF is the slave unit SUB1, 2... in the room and the base unit 2 (first
This is the interface shown in Figure). Further, the central processing unit 31 decodes the binary code signal sent from the base unit via the line 30, and forms a communication path between the slave unit and the base unit via the line L according to the number. In addition to sending out the channel selection signal SEL, the call request signal is also sent out.
The unlock selection signal ELEN is generated in response to CREQ. Now, in order to distinguish between the area number signal and the unlock signal,
When pressing the numeric key switch, if the calling key switch is pressed first and then the number key switch is pressed, it is set as an unlock signal, and if the number switch is pressed first and then the calling key switch is pressed, it is set as a station number selection signal. Therefore, if you press the call key switch for the first time on base unit 2, if this is encoded into a binary code and transmitted to line 30,
The binary code data is, as mentioned above,
“1011” and all outputs of OR circuits _{X8 to 5} are
Therefore, the output of the AND circuit A20 becomes a high level, and the call request signal CREQ is input to the central processing unit 31. In response to this, the central processing unit 31 sends an unlock selection signal to the AND circuit A10.
Bring out ELEN. Next, when the number is input as a binary code signal, if the number matches the number set in the switches S ₁ to _{S 4} (1001=9 in the illustrated example), the OR circuits X ₁ to _{X 4} All outputs become low level, the output of AND circuit A10 becomes high level, transistor Tr turns on, relay Ry contacts close, electric lock or automatic door is energized or unlocked, and the door can be opened. . Conversely, if the number first comes in as a binary code signal, one of the outputs of OR circuits X _{5 to 8} will be high.
level, so the output of AND circuit A20 is
The level becomes low, and the central processing unit 31 does not output the unlock selection signal ELEN. Therefore, this number is
If it happens to match the PIN number, the OR circuit
The outputs of X _{1 to 4} are all low level, but since the unlock selection signal ELEN is not output, the AND circuit A
Since the output of No. 10 cannot be at a high level and the transistor Tr is never turned on, the electric lock will not be unlocked or the automatic door will not be driven by mistake. Next, when the binary code data of the calling key switch comes in, the central processing unit 31 generates a channel selection signal SEL in response to this and sends it to the interface IF.
Accordingly, a communication path is formed between the handset units SUB1, SUB2, . As is clear from the above embodiments, according to the intercom system of the present invention, the numeric key switch installed in the main entrance unit of the intercom which has a channel selection function using a numeric keypad can be used not only to select a channel but also to use an unlock number. Since it is configured so that it can also be used to unlock the door, if this intercom system is applied to an apartment complex, etc., a visitor can use a single numeric keypad to press the key switch for the channel selection number, and the intercom device will let the visitor enter the residence. Residents can use the same device to unlock the door and enter the room by pressing the key switch with the unlock number, even if they do not have the key with them. In this way, the same numeric keypad can be used for channel selection and unlocking, and in addition to the channel selection function, the collective entrance main unit can also be equipped with a password unlocking function, simplifying its implementation. An intercom which is not only easy to use but also has good operability and aesthetics can be obtained. Although the above embodiment describes a loudspeaker intercom that uses a call switch as an activation switch, the present invention is not limited to such an embodiment, and is equally applicable to a telephone intercom that uses a telephone switch as an activation switch. It is possible.

[Brief explanation of the drawing]

FIG. 1 is a basic block diagram of an intercom system with an unlocking function according to the present invention, and FIG. 2 is a circuit diagram of a signal transmission circuit used in the intercom system shown in FIG. 1.
Fig. 3 is a circuit diagram of a control device used in the intercom system shown in Fig. 1, Fig. 4 is a diagram showing a signal detection program of the control device shown in Fig. 3, and Fig. 5 is a diagram of another embodiment of the control device. It is a circuit diagram. SUB1, 2, 3...Intercom handset, L...
...Intercom line, 2...Intercom base unit, SW _0-9 ...numeric key switch, SW call...calling key switch, 3...control device.

Claims (1)

[Claims] 1. Connected via an intercom line to intercom handsets installed in multiple living rooms separated by doors from the entrance, and connected to the intercom base installed at the entrance with numeric key switches 0 to 9. A control device incorporates a start switch, selectively generates a station number signal for the handset and an unlock signal for the door according to the difference in the operating order of the ten key switch and the start switch, and converts this signal into a binary code. and in this control device, the encoded and transmitted station number signal,
Discriminatively detects the unlock signal, performs a channel selection function in accordance with the area number signal, and forms a calling and talking circuit between the base unit and the handset corresponding to the area number signal via the intercom line. Further, the unlocking device performs an unlocking function in response to the unlocking signal, and generates a drive signal to unlock the door when the unlocking signal and a preset password match. Intercom system with lock function.