JP2577806B2 - Door phone selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a plurality of doorphones configured to automatically terminate incoming calls after a predetermined time, and to selectively switch between the plurality of doorphones. And a master unit for making a call with the switched intercom.

(Prior Art) In recent years, home telephone apparatuses having various functions have become mainstream. For example, a base unit that responds to a door phone, which was conventionally provided separately, is integrated into a telephone device so as to be incorporated into the telephone device, and one telephone device can switch between an outside call and a call with the door phone. I have. In this case, place the door phone at the entrance, for example.
A plurality of units such as one unit and one unit are provided at the entrance, and the telephone device is provided with a plurality of doorphone buttons for selecting which doorphone to talk with.

Also, in recent condominiums, business buildings, general hospitals, etc., one master unit has been installed in the management room,
Doorphones are installed at the front entrance, the back door, the relevant person's entrance, the nighttime entrance, etc., so that calls can be made between the master unit and each doorphone.

As described above, in a conventional telephone device having a plurality of doorphones, during an incoming call of the doorphone, the handset of the telephone device is picked up, or among the plurality of doorphone buttons provided on the telephone device, the incoming doorphone is received. By pressing the doorphone button corresponding to the, the user can talk with the doorphone.

(Problems to be Solved by the Invention) By the way, in such a conventional telephone device, an incoming call from a door phone is automatically terminated after a predetermined time. Therefore, for example, when there is an incoming call from an arbitrary intercom, if the telephone device is in a call with an outside line, the call is terminated or interrupted (held) until an attempt is made to make a call with the corresponding intercom. In some cases, such a state may occur that the predetermined time has elapsed. If the user wishes to make a call again with the intercom having the incoming call at this time, the user of the telephone device remembers in advance which intercom the incoming call came from, and then the intercom I had to turn on the corresponding doorphone button. In other words, if the user does not remember which doorphone the incoming doorphone was, the doorphone buttons are sequentially turned ON, for example, doorphone button → doorphone button → doorphone button, and the incoming call is received. A complicated operation such as searching for the other party of the door phone was required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a storage unit for storing a last-received door phone, thereby facilitating a paging operation of the last-received door phone. Is to provide.

(Means for Solving the Problems) In order to solve the above problems, a door phone selection apparatus of the present invention includes a plurality of door phones configured to automatically terminate incoming calls after a predetermined time, and a plurality of these door phones. And a master unit for making a call with the switched intercom, a unique identification code is assigned to the intercom corresponding to each of the plurality of intercoms. In addition to storing the identification code of an arbitrary intercom that has received an incoming call, and when there is an incoming call from another intercom, the stored content is updated to the identification code of the new intercom that has received the incoming call. A storage unit that always stores the identification code of the last intercom, and an operation for reading the identification code that is provided in the base unit and stored in the storage unit. And a line connection unit for connecting a call line between the door phone corresponding to the identification code read from the storage unit and the master unit by an ON operation of the operation button.

(Operation) A unique identification code is assigned to each of a plurality of doorphones corresponding to each of the doorphones, and the storage unit stores an identification code of an arbitrary doorphone that has received a call. In addition, after storing the identification code of an arbitrary door phone, the storage unit updates the stored content to the identification code of the new door phone that has received the incoming call when another incoming call is received from another door phone. That is, when there is a plurality of incoming calls from the intercom, the identification code of the intercom which last received the incoming call is stored in the storage unit. On the other hand, the master unit is provided with one operation button for reading the identification code stored in the storage unit, and the line connection unit reads the identification code from the storage unit by turning on the operation button. The communication line between the door phone corresponding to the issued identification code and the master unit is connected.

That is, the intercom selection device of the present invention can be operated by simply turning on the operation button after the end of the incoming call, for example, even when an incoming call is received from an arbitrary intercom during an external call, without having to remember which intercom is that intercom. Then, the communication line with the intercom which received the last call is connected.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The drawings are block diagrams showing the electrical configuration of the door phone selection device of the present invention.

In the figure, reference numerals 1 ₁ , 1 _2, ... Denote doorphones, respectively. In this embodiment, N units are provided. Each of these door phone 1 _1, 1 ₂ ... are output, respectively call line 3 _1, 3 ₂ ... analog switches 4 ₁ corresponding via, 4 ₂ ... is led to one terminal of the analog switches 4 ₁ , 4 ₂ …
It is connected to the call terminal of the telephone 20. The other outputs of the doorphones 1 ₁ , 1 _2, ... Are respectively guided to the doorphone selection logic unit 5 via the doorphone switch detection signal lines 2 ₁ , 2 ₂ ,. It is led to the latch circuit 6.

The intercom selection logic unit 5 is an encoder that converts a natural number N into log ₂ N, and each intercom 11 ₁ , 1 ₂ ,.
It outputs log ₂ N bid data (identification code) corresponding to a continuous natural number from 1 attached to. That is, it outputs binary data indicating the numbers of the doorphones 1 ₁ , 1 _2, .... However, in this embodiment, the latch door phone selection logic unit 5 doorphone 1 ₁ No.1 circuit 6
The output corresponds to decimal 0 to the output from the intercom selection logic unit 5 doorphone 1 ₂ No.2 to the latch circuit 6,
It is set to correspond to the decimal number 1. That is,
The latch circuit 6 stores an identification code having a number one less than the actual number assigned to the door phone.
Although the number of outputs of the intercom selection logic unit 5 is shown as one in the drawing, for example, the intercoms 1 ₁ , 1 ₂ ,.
When six are installed, the number of outputs of the intercom selection logic unit 5 is four (that is, log ₂ 16 = 4). The output of the latch circuit 6 is guided to a programmable counter 7,
Is guided to a decoder 8 that converts log ₂ N to N. Then, N present in the output signal lines from the decoder 8 is supplied to the corresponding one of the respective analog switches 4 _1, 4 ₂ ... switching control input.

On the other hand, the intercom selection logic unit 5
When an incoming signal is input from 1 ₁ , 1 ₂ … through the doorphone switch detection signal lines 2 ₁ , 2 ₂ …, a pulse signal indicating the incoming call is sent to the latch circuit 6 via the incoming detection signal line 51. While guiding it to the clock terminal (CK) as a clock signal,
The signal is led to a load terminal (LOAD) of the programmable counter 7 as a setup signal.

The telephone terminal of the telephone 20 is connected to a telephone line 10 for making a telephone call with a terminal (not shown) and an extension telephone (slave) (not shown) via an external / extension switching circuit 9. . Further, an ON signal 201 of the intercom button, which is transmitted by turning on an intercom button (operation button: not shown) provided on the telephone 20, is guided to a switching control input of the outside / extension switching circuit 9, and It is led to the clock terminal (CK) of the programmable counter 7 and the operation switching terminal of the analog switch group 4. A switching instruction signal 202 for switching between an outside line and an inside line is guided from the telephone 20 to a switching control input of the outside / inside line switching circuit 9.

The outside / extension switching circuit 9 is normally connected to the telephone line 10 and is in a state of waiting for an incoming call from an outside line. When the intercom button of the telephone 20 is turned ON, the connection between the outside line and the extension and the telephone 20 is maintained in a disconnected state (OFF state) based on the ON signal 201 of the intercom, and a switching instruction signal for the outside line or the extension is provided. When 202 is given, the line is switched to an external line or an internal line in accordance with the signal. Analog switch group 4
Is normally in a non-operating state, and the non-operating state is released based on the intercom ON signal 201 by turning on the intercom button in response to an incoming call from an arbitrary intercom (that is, the intercom corresponding to the telephone 20). Connections with 1 ₁ , 1 ₂ … are made.) Further, when the door phone button of the telephone 20 is turned ON, the programmable counter 7 outputs the binary identification code stored in the latch circuit 6 based on the door phone button ON signal 201 guided to the clock terminal (CK). A new identification code to which 1 has been added and a decoder 8 are transmitted.

With the above-described configuration, when there is a sequential incoming call from a plurality of doorphones at intervals of a predetermined time or more when the incoming call is terminated, the stored contents are sequentially updated. intercom 1 _i (i is an arbitrary natural number up to 1 to N) identification code corresponding to the (the identification code, as described above, if the i-th intercom 1 _i, i-
This is a code indicating 1. ) Will be stored.

Next, the operation of the doorphone selection device having the above configuration will be described.

For example, if the telephone 20 receives an incoming call from the doorphone 1 ₃ of the state is not performed nor extension call outside call, for example No.3, the signal indicating the intercom 1 ₃ of the No.3 is, for intercom switch detecting It is guided to the intercom selection logic unit 5 through the signal line 2 _3. Intercom selection logic unit 5, a signal indicating the intercom switch detection signal line 2 ₃ directed through the integer 2 (i.e., 3-1), a binary "00
The value is converted to 10 ", and the value of each digit is sent out to the corresponding output signal line (shown as one signal line in the drawing as described above) and input to the latch circuit 6. At this time, the latch The clock signal (CK) of the circuit 6 receives a pulse signal from the doorphone selection logic unit 5 through the incoming call detection signal line 51 to notify the incoming call.
Stores a signal (identification code) indicating “0010” from the intercom selection logic unit 5 based on the pulse signal. The pulse signal for notifying the incoming call from the doorphone selection logic unit 5 is also input to the LOAD terminal of the programmable counter 7, so that the programmable counter 7
Loads the signal indicating “0010” stored in the latch circuit 6 and sends it to the decoder 8. The decoder 8 converts the derived signal indicating “0010” into a signal indicating a decimal number 2 again, and at this time, the signal corresponding to the signal indicating 2 is No. 2
To the control input of the analog switch 4 ₂ sends a signal indicating the switch ON. At this time, the analog switch group 4
Since a non-operating state, the analog switch 4 ₂ without operating ON, and thus to maintain the OFF state. Thereafter, when the user turns on the doorphone button of the telephone 20, the ON signal 201 of the doorphone button is guided to the clock terminal (CK) of the programmable counter 7,
Based on the ON signal 201, the programmable counter 7 sends a signal indicating “0011” obtained by adding “0010” stored in the latch circuit 6 to the binary number 1 to the decoder 8.
The decoder 8 outputs a signal indicating the derived “0011” to 10
The signal is converted into a signal indicating the base _{3 and} the control input of the No. 3 analog switch 43 corresponding to the signal indicating the base 3 is connected to the switch.
Sends a signal indicating ON. At this time, the door phone button
Since the ON signal 201 is a non-operating state of the analog switch group 4 is released, the analog switch 4 ₃ is activated ON, and the intercom 1 ₃ and the telephone 20 of No.3, call line 3 ₃ and the analog switch 4 ₃ and will be connected through. That is, by picking up the handset of the telephone 20, it is possible to call with intercom 1 _3. Thereafter, when the handset is placed on the telephone set 20 (that is, in the on-hook state), the analog switch group 4 returns to the non-operation state again.

On the other hand, when there is an incoming call from the doorphone 1 ₃ No.3, telephone 20 to telephone 20 is, for example, a external call or in an extension busy, within a predetermined time to call termination automatically from intercom 1 ₃ of if it can not be turned oN intercom button, it remains connected to the doorphone 1 ₃ and the telephone 20 is not performed, so that the call from the doorphone 1 ₃ ends. At this time, the latch circuit 6, intercom 1 ₃ No.3
Is stored. Thereafter, the user of the telephone 20 has finished external call or extension call, when attempting to call the doorphone 1 ₃ for which the incoming call is turned ON the intercom button provided on the phone 20. Since the ON signal 201 of the door phone button is guided to the clock terminal (CK) of the programmable counter 7, the programmable counter 7 converts the binary number 1 into “0010” stored in the latch circuit 6 based on the pulse signal.
And outputs a signal indicating “0011” to the decoder 8.
The decoder 8 outputs a signal indicating the derived “0011” to 10
Into a signal indicating the 3-adic, to the control input of the analog switch 4 ₃ corresponding to this signal and sends a signal indicating the switch ON. At this time, since the non-operating state of the analog switch group 4 is released by the ON signal 201 doorphone button, the analog switch 4 ₃ is activated ON, intercom
1 and ₃ and the telephone 20 are connected via the call line 3 ₃ and the analog switch 4 _3. That is, by picking up the handset of the telephone 20, it is possible to call with intercom 1 _3. Thereafter, when the handset is placed on the telephone set 20 (that is, in the on-hook state), the analog switch group 4 returns to the non-operation state again.

When the door phone button is further turned ON once in the above state, the programmable counter 7 reads “00”.
A signal indicating 0100 "to" plus one binary number "sent to the decoder 8 11, so that the connection is switched from the door phone 1 ₃ No.3 in intercom 1 ₄ No.4. As described above, by sequentially turning on the doorphone buttons, the connection to other doorphones can be sequentially switched, except that the programmable counter 7 receives the ON signal 201 of the doorphone button at the clock terminal (CK). Accordingly, a signal indicating “0001” obtained by subtracting 1 from the signal indicating “0010” derived from the latch circuit 6 can be sent to the decoder 8. That is, the countdown is performed. Can be configured.

In the above embodiment, the intercom selection device according to the present invention is described as being integrated with the telephone device. However, the present invention can be applied to a system using only the intercom separately from the telephone device. .

(Effect of the Invention) The intercom selection device of the present invention stores the identification code of an arbitrary intercom that has received an incoming call, and when there is an incoming call from another intercom next, stores the stored content as a new incoming call. By updating to a unique doorphone identification code,
A storage unit that always stores the identification code of the intercom that last received the call was automatically connected to the intercom that last received the call simply by pressing the operation button provided on the telephone. Can be. For this reason, the user himself remembers the door phone that received a call as in the past,
This eliminates the hassle of turning on the corresponding intercom button.

[Brief description of the drawings]

The drawings are block diagrams showing the electrical configuration of the door phone selection device of the present invention. 1 ₁ , 1 ₂ … Doorphone 4 ₁ , 4 ₂ … Analog switch 5… Doorphone selection logic 6… Latch circuit 7… Programmable counter 8… Decoder 9… Outside / extension switching circuit 20… Telephone

Claims (1)

(57) [Claims] A plurality of intercoms configured to automatically terminate incoming calls after a predetermined time, a parent for selectively switching between the plurality of intercoms, and performing a call between the switched intercoms. In the intercom selection device provided with a device, a unique identification code is assigned to each of the intercoms corresponding to each of the plurality of intercoms, and the identification code of any intercom which has received a call is stored. When there is an incoming call from another door phone, a storage unit that constantly stores the identification code of the last incoming door phone by updating the storage content to the identification code of the new door phone that has received the incoming call, An operation button provided on the master unit for reading the identification code stored in the storage unit; and an identification button read from the storage unit by turning on the operation button. Intercom selection device being characterized in that a line connection section for connecting the doorphone corresponding to encode communication line between the master unit.