JPS6328554B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a key telephone device that allows a telephone call to be made between a key telephone and a doorbell via an extension telephone line.

In such button telephone devices, the extension communication path is shared for calls between key telephones and calls between the key telephone and the doorbell, so it is easy to forget to hang up the handset after a call with the doorbell and go into an off-hook state. If you continue, the call state between the doorphone and the doorphone connected to the extension line will be maintained, and individual calls between key telephones using the extension line will be made.
In addition to making it impossible to make simultaneous calls or making calls from the doorbell, if a call is made between key telephones, the voice of the call will be amplified and then emitted from the doorbell.

In addition, a means for detecting that the handset of a button telephone is in a half-hung state and issuing a warning for the half-hooked key telephone has been proposed in ``Key Telephone Device'' (Japanese Patent Application No. 14652, 1982). However, in the above case, there is no call termination operation on the doorbell side,
Since the main device cannot detect the end of the call to the doorbell, and the extension line is still in the busy state, it is not possible to detect a half-hook state, and it is impossible to issue an alarm. It is also impossible to solve the above-mentioned drawbacks.

The purpose of the present invention is to fundamentally solve the above-mentioned drawbacks of the conventional technology, and when the conversation between the key telephone and the doorbell continues for a certain period of time or more, the doorbell is forcibly disconnected from the extension line, and the doorbell is disconnected from the off-hook. To provide an extremely effective key telephone device which issues an alarm to the key telephone inside the telephone and completely prevents the continuation of a busy state due to forgetting to hang up the handset after a call to a doorbell. It is something.

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

Figure 1 is a block diagram of the entire configuration mainly consisting of the communication system, and shows the central office line circuit that connects the subscriber line connected to the line terminals L ₁ and L ₂ and the central office line communication line Ll.
It is equipped with an SLC and is connected to the extension line Li via a transformer _T01 for supplying call current, detects dial pulses and dial signals using two-frequency signals, and sends out call back tones. There is an extension circuit INC for connection to the electric lock EL, a door phone circuit DPC for connection to the door phone DP, and a 4-wire button telephone (hereinafter referred to as
Interfaces IF ₁ to IF ₅ are provided for connection with 4W telephones) TEL ₁ to _{TEL 4} and 2-wire telephones (hereinafter referred to as 2W telephones) TEL ₅ , and these constitute the main unit KSU. .

Note that in this example, interfaces IF ₁ to _{IF 4}
have the same configuration, and the 4W telephone TEL ₁ with the same configuration
~TEL ₄ , signal line Ws ₁ ~Ws ₄ and speech line Wt ₁ ~
Connected by Wt ₄ but located far away
The 2W telephone TEL ₅ is connected to the interface IF ₅ only by a connection line We.

In addition, the main unit KSU includes amplifiers A ₀₁ , A ₀₂ , a ring tone generator CTG, an alarm tone generator ATG, and switch circuits AS 01 to AS ₀₁ using analog switches, etc.
AS ₀₃ is provided, and when these are turned on, the signal path Lt is connected to the transformer T ₀₁ , capacitor C ₀₂ , resistor R ₀₄ , amplifier A ₀₁ , and resistor from the extension communication path Li.
R ₀₅ , switch circuit AS ₀₁ , amplifier A ₀₂ , sending out the ringing voice via capacitor C ₀₅ , switch circuit AS ₀₂ from ring tone generator CTG, resistor R ₀₆ , capacitor C ₀₃ , amplifier A ₀₂ , capacitor C Sending of the ring tone via ₀₅ and switch circuit from the alarm tone generator ATG AS ₀₃ , resistor R ₀₇ , capacitor
C ₀₄ , amplifier A ₀₂ , and capacitor C ₀₅ to send an alarm sound, and the door phone circuit DPC
The chiming sound from amplifier A ₀₂ and capacitor C ₀₅
It is supposed to be sent via .

On the other hand, the 4W telephones TEL ₁ to _{TEL 4} transmit and receive various control signals to and from the signal circuits SRK ₁ to SRK ₄ of the interfaces IF ₁ to _{IF 4} .
A signal circuit SR that has an extension button, a remote button for calling the 2W telephone TEL ₅ , a station line indicator light, etc., a call circuit TK that has a dial circuit that sends out dial pulses or dial signals, a hook switch, etc., and a monitor button MON.
and a speaker SP to which the connection destination is selected.

In addition, the interfaces IF ₁ to IF ₄ are connected to the communication lines Wt ₁ to _{Wt 4} from the 4W telephones TEL ₁ to TEL ₄ to the extension communication line Li in constant operation, and when the communication line is restored, the communication lines We _{1 to We 4 are connected to the interfaces IF 1} to _{IF 4} . Relay contacts fa to fd are provided to connect the 4W telephones TEL ₁ to TEL 4 to the office line communication path Ll, and relays LA to LD are provided to detect off-hook of the 4W telephones TEL 1 to _{TEL 4} . Ll
When making calls via
While the communication current is supplied via the SLC, when making a call via the extension communication path Li, the communication current is supplied from the circuit consisting of the transformer T ₀₁ , resistors R ₀₁ , R ₀₂ , and capacitor C ₀₁ . The relays LA to LD are set to operate.

Regarding the above, since the 2W telephone TEL ₅ is for general subscribers, accordingly,
The interface IF ₅ is provided with a coupling circuit consisting of resistors Re ₁ and Re ₂ , a transformer Te, and capacitors Cse ₁ and Cse ₂ , and when a call is made via the extension line Li, the same connections as contacts fa to fd are provided. The communication current is supplied from the coupling circuit via the contact fe, and when making a call via the central office line communication path Ll, the communication current is supplied from the subscriber line, similar to the 4W telephones TEL ₁ to TEL ₄ . Off-hook is detected by relay LE.

However, the control circuit CTC of interface IF ₅
is equipped with a ringing signal generator, a busy tone generator, etc., and when the relay contact i operates, the control circuit
A ringing signal or busy tone is sent from the CTC to the 2W telephone TEL ₅ .

In addition, capacitor Cpa in parallel with relays LA to LE
~Cpe prevents these from being restored by dial pulse or footing, and capacitors Csa ~ Csd of interface IF ₁ ~ IF ₄
is for coupling the AC signal on the signal path Lt to the signal lines Ws ₁ to _{Ws 4} to make the speaker SP sound.

In addition, an electric lock EL connected to the door phone circuit DPC by a control line Wl is installed on a door such as an entrance, and an electric lock EL is connected to the door phone circuit DPC by a sending line Ws and a receiving line Wr.
Confirm returnees or visitors by calling DP,
For example, if you dial "7" on a 4W telephone that is communicating with the door phone DP, the electric lock EL will be unlocked for a certain period of time.

Therefore, for example, 4W telephone TEL ₁ makes a call, operates the extension button of the signal circuit SR, and then
If you dial "2" to call the telephone TEL ₂ , the relay LA will operate and the signal circuit will be activated.
SRK ₁ receives the control signal according to the extension button,
And in the case of dial pulse, the extension circuit INC detects the terminal voltage change of resistor R ₀₂ , or
In the case of a dial signal, the extension circuit INC detects the two-frequency signal using the terminal voltage of the impedance matching resistor R ₀₃ connected to the secondary winding of the transformer T ₀₁ , and controls these detection forces as described below. , the control section turns on the switch circuit AS ₀₂ , sends out the ringing tone to the signal path Lt, and also
4W telephone TEL ₂ signal circuit SR by controlling SRK ₂
By transmitting a control signal to the telephone and activating the amplifier in the circuit SR, the speaker SP of the telephone TEL ₂ rings to notify the incoming call.

At this time, a callback tone is sent from the extension circuit INC to the secondary winding of the transformer T ₀₁ according to the control of the control unit, so that the 4W telephone TEL ₁
In addition to hearing this, the 4W telephone
As soon as TEL ₂ goes off-hook, the call becomes active.

Also, for example, if the 4W telephone TEL ₁ goes off-hook and operates the central office line button, a corresponding control signal is received by the signal circuit SRK ₁ , and the relay LA operates, so the control signal is activated in response to these detection operations. The control unit restores the contact fa, and
By controlling the signal circuit SRK ₁ and transmitting a control signal to the signal circuit SR to turn on the office line indicator light, the office line indicator light of the 4W telephone TEL ₁ lights up, and at the same time, the office line communication line Ll is turned on. and station line circuit
The telephone TEL ₁ is connected to the subscriber line via the SLC.

In addition, incoming calls from subscriber lines are sent to the central office line circuit SLC.
In addition, this detection force is given to the control unit, so the control unit connects the signal circuit SRK ₁ to
Control SRK ₄ at the same time and each 4W phone TEL ₁ ~
By simultaneously operating the amplifiers in the signal circuit SR of TEL ₄ and sending a ringing tone to the signal path Lt, each speaker SP rings simultaneously.

Next, if there is a call from the door phone DP, a chime sound is sent from the door phone circuit DP, and the control unit detects the call from the door phone DP,
Accordingly, each 4W telephone TEL ₁ ~
In order to activate the amplifier in the signal circuit SR of TEL ₄ , a chime sound is emitted from each speaker SP, and in response to this, one of the 4W telephones goes off-hook and responds to the incoming call from the door phone DP.
A call is made via the extension line Li, the secondary winding of the transformer _T01 , and the doorphone circuit DPC.

Furthermore, for example, if the 4W telephone TEL ₁ is off-hook and the remote button is operated, the relay LA will operate and a control signal corresponding to the remote button will be transmitted from the signal circuit SR.
The control unit controls the control circuit CTC according to these,
And by operating contact i, a ringing signal is sent to 2W telephone TEL ₅ , and the same telephone
Relay LE controls circuit according to off-hook of TEL ₅
When operated by the loop current from the CTC, the control section restores the contact i in accordance with this, and a call is made via the extension communication path Li.

Note that the dial pulse when making a call from the 2W telephone TEL ₅ is given to the extension circuit INC as a change in the terminal voltage of the resistor Re ₂ , and is thereby detected and handled in the same manner as described above.

Figure 2 is a block diagram of the control system in the main unit KSU, with a control unit CNT consisting of a microprocessor, memory, input/output circuits, etc. arranged in the center.
Interface IF ₁ ~ IF ₅ signal circuit SRK ₁ ~
SRK ₄ and control circuit CTC, relay FA~FE,
I, contacts la to le, and the office line circuit SLC, extension line circuit INC, door phone circuit DPC, etc. are arranged around the signal circuit SRK ₁ to SRK ₄ , control circuit CTC, office line circuit SLC, extension line circuit INC. and doorbell circuit
While data for control is exchanged with the DPC, switch circuits AS ₀₁ to _{AS 03} ,
For relays FA to FE, I, the control data is decoded by decoder DEC ₀₁ and then sent to the latch circuit.
Each output of decoder DEC ₀₁ is held by LAT,
Drive is performed by this, but the contacts la~le
Each output of incorporates these on and off information by sequential and iterative scanning.

FIG. 3 is a circuit diagram showing the details of the door phone circuit DPC.
Power is supplied through the power supply circuit PS
The transmitter HA is connected to the transmitter amplifier HA, and while the calling switch PB is off,
The line-to-line DC resistance of Ws is large, and the call detection circuit
Transistor Q ₁₀ of CDT is forward biased by resistors R ₄₈ , R ₄₇ and diode D ₅ and turned on, but if switch PB is turned on,
A resistor Rd with a low resistance value is inserted, the line-to-line DC resistance of the transmission line Ws is reduced, the transistor _Q10 is turned off, and the collector voltage through the resistor _R46 becomes "H".
(high level), this is given to the control unit CNT as a signal DRIN indicating an incoming call from the door phone DP.

Then, the control unit CNT sends control data,
Decoder DEC ₀₂ with latch function accordingly
For example, a signal for sending a chime sound for only 3 seconds.
In order to send DRTN as "L" (low level), transistor _Q7 is turned off, and the collector voltage through resistor _R30 is set to "H", and this is applied to control terminal C of chime sound generator CHG. , the same generator is activated for 3 seconds, and the chime sound is applied to the amplifier A ₀₂ via the voltage divider circuit consisting of capacitor C ₂₄ and resistors R ₄₂ and R ₄₃ , capacitor C ₂₆ and resistor R ₄₅ , and as described above. As per each 4W phone
It is sent to the speakers SP of TEL ₁ to TEL ₄ .

In addition, at this time, "H" of the collector of transistor _Q7 is connected to the transistor through resistor _R19 .
It is applied to the base of _Q5 , transistor _Q5 is turned on, and resistors _R21 and _R20 turn on transistor Q5.
To forward bias the base of Q ₆ and turn it on as well, power supply +E is applied to amplifier A ₂ through resistor R ₄₉ , which becomes operational and resistor
The chiming sound via R ₄₁ and capacitor C ₂₇ is amplified, and as shown by the solid arrow, the amplifier
Output of A ₂ , one side of receiving line Wr, transformer Tr, receiving line
On the other side of Wr, the signal is sent out through the path of capacitor _C28 , and the speaker SPd of the door phone DP rings as a chime sound.

However, in this case, since the diode D ₂ blocks the application of the power supply +E, the amplifiers A ₁ and A ₃
is not in operation.

Next, in response to the chime sound, call the 4W telephone TEL _1.
~ If you answer any of TEL ₄ by off-hook, for example by dialing "6" and operating the extension button, the control unit CNT will send out control data in response, and the decoder DEC ₀₂ will call the doorbell.
Signal DRON for connecting DP to extension line Li
is sent out as "H".

Then, the transistor Q ₃ turns on, and the resistors R ₄ and R ₅ apply a forward bias to the base of the transistor Q ₂ , which is also turned on, so that the power supply +E is applied to the amplifiers A ₁ to A ₃ . These become operational at the same time, and the door phone DP is connected to the extension line Li via the transformer _T01 .

That is, the audio signal from the microphone M of the door phone DP is amplified by the transmitting amplifier HA, and as shown by the dotted line, the audio signal is transmitted through the transformer Ts, the transmitting line Ws, the capacitor C ₁₁ , the amplifier A ₃ , and the three-turn transformer.
Td, resistors R ₂₄ , R ₂₅ , R ₂₇ , capacitor C ₁₆ , and the secondary winding of transformer T ₀₁ are sent to the extension line Li, while the audio signal from the extension line Li is connected to the solid line. As shown by the secondary winding of transformer T ₀₁ , capacitor C ₁₆ , resistors R ₂₇ , R ₂₅ , one winding of three-turn transformer Td, resistor R ₂₈ , potentiometer RV ₁ , amplifier A ₁ , capacitor C ₈ , resistor R ₁₁ , amplifier A ₂ ,
It passes through the receiving line Wr, the transformer Tr, and is sent to the speaker SPd.

However, a timer is configured in the control unit CNT, and is set in response to the detection of a response due to the off-hook of the 4W telephone, and is also set by the on-hook of the 4W telephone, but the timer is set when the off-hook is continued. Then, the timer times up, for example, after 180 seconds, and the control unit CNT outputs a signal accordingly.
Amplifier A ₁ to force DRON to “L”
~A ₃ stopped working and the doorbell DP was disconnected from the extension line.
At the same time as disconnecting from Li, the control unit CNT turns on switch circuit AS ₀₃ and operates the amplifier of the signal circuit SR in the off-hook 4W telephone, so that an alarm is issued for the off-hook 4W telephone. There is.

Therefore, the busy state with the door phone DP caused by forgetting to hang up the handset of the 4W telephone is automatically canceled after a certain period of time, and various inconveniences caused by forgetting to hang up the handset are completely prevented.

Note that the timer can be reset by dialing "6" again within 180 seconds after being set, making it possible to extend the call time with the door phone DP.

In addition, in a 4W telephone, if you dial, for example, "7" after off-hook, the control unit CNT sends control data, and the decoder DEC ₀₂ sends out the release signal UNLK as "H" for, for example, 5 seconds. This is applied to the base of transistor Q ₁ through resistor R ₂ and
When Q ₁ turns on, relay U operates and contact u turns on, and the electric lock EL is unlocked for only 5 seconds, allowing entry and exit from the door.

At this time, the signal DRON is also sent as "H", so you can talk to the doorbell DP freely, but if you perform the above operation while talking to the doorphone DP, the electric lock EL will also be activated for 5 seconds. Only the lock will be unlocked.

FIG. 4 is a flowchart of the control status by the control unit CNT.
ON” is performed, the office line indicator lights of 4W telephones TEL ₁ to TEL ₄ light up all at once by “LED ON”,
Next, depending on the status of contacts la to le, the slave unit
LOOP is detected, and relays FA to FE are controlled to release the LOOP OFF handset from the central office line.
However, if "Is there a handset in use of the office line?" is Y (YES), the state of "talking on the office line" using the subscriber's line continues.

Also, “Is there a handset in use by the central office line?” is set to N (NO).
If so, “LED OFF” will turn off the 4W phone TEL ₁
~Turn off the TEL ₄ station line indicator light and transition to “iDLE” status.

In figure B, the state changes from “iDLE” to “local arrival”.
When the result is Y and an incoming call from the subscriber's line is detected, the "office line incoming call" process is performed to send a ring tone to the speaker SP of the 4W telephone TEL ₁ to TEL ₄ ,
When an incoming call from the door phone DP is detected by Y of "door call", the state becomes "door phone call arrived" and the process moves to C in the figure.

In addition, when the central office line button operation of the 4W telephone is detected by Y of "4W LiNE ON", the "LiNE preselection" process prepares for a call using the central office line communication path Ll, and the "4W iNT ON" If 4W telephone extension button operation is detected by Y,
The “iNT preselection” process prepares for a call using the extension line Li, and
When the remote button operation of the 4W telephone is detected by "Y" of "ON", preparation for a call with the 2W telephone TEL ₅ is performed by "S preselection" processing, and the off-hook of the 4W telephone is performed by "Y" of "4W OFF HOOK". If detected, an "off-hook" process is performed to send out a ring tone and close the communication circuit based on the preparations described above in response to the dial operation.

Furthermore, if off-hook of the 2W telephone TEL ₅ is detected by Y of "2W OFF HOOK", a "remote call" process is performed to send out a ring tone in response to the dial operation and close the communication circuit.

In C of the same figure, in response to "incoming doorbell call",
In addition to the “3 second timer set” in the control unit CNT, “door chime to 4W EXT”
When the chime sound is sent to 4W telephones TEL ₁ to TEL ₅ , and the 3-second timer's "Time Up" is Y, the chime sound is stopped by "stop door chime", and then the system returns to B in the same figure. Return to “iDLE” state.

On the other hand, if the 4W telephone goes off-hook while "Time Up" is N and you dial "6" to answer, "4W EXT Doorphone Call" becomes Y and the 3-second timer is "reset". Furthermore, in response to this, the "door call stop" is performed, and the state shifts to the "door phone call" state shown in FIG.

In addition, if the 4W telephone goes off-hook and dials "7" while "4W EXT Doorbell Call" is N, "4W EXT Unlock" becomes Y, and "Timer Reset" of the 3-second timer and "Stop Doorbell" are activated. After this, the state shifts to the "door unlock" state shown in E of the same figure.

In D of the same figure, in response to a "door phone call",
It sends out the signal DRON to connect the caller to the doorbell, and also sets the 180-second timer in the control unit CNT to set the 180-second timer's Time Up.
If it becomes Y, the doorbell is opened by stopping the signal DRON, and an off-hook warning is sent to the caller.

Furthermore, after setting the 180 second timer, it is possible to interrupt a doorbell call from another 4W telephone.
When “Time Up” is N, it is determined that there is “one handset”, and if this is N, “caller ON” is determined.
Assuming Y of ``HOOK'', ``Set the handset as an interrupter'' and ``Set the 180 second timer'' again.

Also, if “1 handset” is Y, “iNT
``Doorphone open'' and ``timer reset'' on the premise that the extension button is being operated by Y of ``ON''.
In addition, "iNT ON" makes it possible to call all at once by voice using "all call" processing.
Assuming that the remote button is operated by pressing the Y of "S ON" following _the N of Perform sending.

On the other hand, if "1 handset" is Y and "iNT ON" and "S ON" are N, when the 4W telephone in use becomes "ON HOOK" Y, "Doorphone open" and " After performing "Timer Reset", the system returns to the "iDLE" state in B of the same figure.

In E of the same figure, in response to "door unlock",
Sends the signal DRON to connect the caller to the doorphone, sets the 180-second timer and 5-second timer in the control unit CNT, and then turns on the signal UNLK by turning the door unlock ON.
and send a signal by Y of “5 seconds Time Up”
After stopping UNLK and turning ``door unlock OFF'', the process moves to ``Time Up'' in D in the same figure, and is handled in the same way as a ``door phone call.''

However, the configurations shown in FIGS. 1 to 3 can be selected arbitrarily depending on the number of subscriber lines to be accommodated and the number of telephones TEL ₁ to TEL ₅ , and in FIG. change the order, or
The present invention can be modified in various ways, such as omitting unnecessary steps depending on the conditions.

As is clear from the above explanation, according to the present invention, the call state between the doorbell and the 4W telephone is forcibly disconnected after a certain period of time, and an alarm is issued to the 4W telephone that is off-hook. This completely prevents inconveniences caused by forgetting to hang up the handset of a 4W telephone after termination, and a remarkable effect can be obtained in a button telephone device equipped with a doorbell.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; Fig. 1 is a block diagram of the entire configuration mainly consisting of the telephone system, Fig. 2 is a block diagram of the control system in the main device, and Fig. 3 is a circuit showing details of the door phone circuit. FIG. 4 is a flowchart of the control situation by the control section. DP...Door phone, TEL ₁ to TEL ₄ ...4W telephone (key phone), Li...Extension line, T ₀₁ ...
...transformer, DPC...door phone circuit, ATG...alarm sound generator, SP...speaker, CNT...control unit, FA~FE...relay, la~le...contacts,
SRK ₁ to SRK ₄ , SR...Signal circuit, Td...Three-turn transformer, _A1 to _A3 ...Amplifier, _Q2 , _Q3 ...Transistor.

Claims (1)

[Claims] 1. In a key telephone device that performs a call between a key telephone and a doorbell via an extension communication path, a response detection circuit detects that the key telephone has responded to an incoming call from the doorphone, and the response detection circuit a timer that is set in response to the detection operation of the doorphone and that is reset by the on-hook of the key telephone that is in communication with the doorphone; A button telephone comprising: a connection control circuit that disconnects the door phone from the extension communication line in response to a time-up; and an alarm circuit that issues an alarm to the key telephone that is off-hook in response to a time-up of the timer. Device.