JPH0220040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a button telephone device that is capable of dialing a central office line from a central telephone office while on-hook, and of receiving and amplifying a response from the other party. It is.

[Prior art]

In a button telephone device consisting of a main device that accommodates a central office line from a telephone office and a plurality of key telephones (hereinafter referred to as telephones), there is an on-hook system that allows dialing to the central office line even when the telephone is on-hook. The hook-dial system is generally adopted, which simplifies dialing operations and allows you to listen to the other party's response using a loudspeaker using a speaker while on-hook. If the central office line is erroneously put on hold while dialing or while amplifying a call, the central office line remains in a locked state, making it impossible to make or receive new calls via the central office line.

[Summary of the invention]

The present invention has an object of fundamentally solving such drawbacks of the conventional art, and is based on the output of the status determining means corresponding to the telephone based on the output of the holding operation detecting means and the output of the status determining means corresponding to the holding operation telephone. hand,
The present invention includes a hold control means that controls the telephone to be on hold when the telephone is in the off-hook state and is acquiring the central office line, and disables the hold operation when the telephone is in any other state, thereby preventing the telephone from being put on hold in the central office line, which is meaningless. The present invention provides a highly effective pushbutton telephone device.

〔Example〕

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

Figure 1 is a block diagram showing the configuration, and the main device
The ME is provided with line terminals L ₁ and _{L 2} to which _the central office line from the telephone office is connected and accommodated. They are connected by a pair of communication lines LT and signal lines LS, and normally the relay L of the main device ME and the relays TK of the telephones TEL ₁ to _{TEL o} operate, and the contacts l ¹ ,
The telephone line LT is connected to the secondary winding of the transformer T _n by l ² , and the telephone power supply VB is supplied through the circuit of the resistor R _B and the capacitor C _B. Even if the line between the telephone line TKC and the telephone line TKC is cut and the switch HS ¹ is turned on due to off-hook, the telephone circuit TKC will not be connected to the telephone line LT unless the relay TK is restored.

In addition, the main device ME and telephones TEL ₁ to TEL _o are
Control circuits CT _n , CT _t consisting of a microprocessor, memory, etc. are provided, and transmitting/receiving circuits SR _n ,
It transmits and receives data via the SR _t and signal line LS, exchanging information between each other, and also controls other parts based on information from other parts, and the control circuits CT _n and CT _t The device operates under the control of the system.

Here, if there is an incoming call from the central office line, the incoming call detection circuit RDT using a photocoupler detects the ringing signal via the DC blocking capacitor C _R ,
In order to give this information to the control circuit CT _n , the control circuit CT _n activates the oscillator OSC _n in response to this, and sends out the office line ring tone to the telephone line LT via the transformer T _n , and also Send control data via LS, restore relays TK of telephones TEL ₁ to TEL _o , operate relay SP, turn on amplifier A, and turn on key/display circuit KDP.
Contact sp ¹ ,
The station line ringing tone via sp ² , tk and transformer T _t is amplified by amplifier A and given to speaker SPK, which rings to notify the incoming call from the station line and also by flashing the station line indicator light. An incoming call is displayed.

In response, for example, the telephone TEL ₁ responds,
When you operate the central line key of the key/display circuit KDP along with the off-hook, this information is transferred to the key/display circuit.
Control circuit CT _t from KDP and switch HS ²
and is sent as operation data to the control circuit CT _n via the signal line LS, so the control circuit CT _n restores the relay L and contacts l ¹ ,
While connecting the telephone line LT to the central office line by l ² ,
Send control data for all telephones TEL ₁ to TEL _o , restore these relays SP, and open the call circuit.
The TKC is disconnected from the telephone line LT, and the central office line indicator light is turned on, thereby indicating that a telephone call with the central office line is in progress.

In the telephone TEL ₁ , the telephone circuit TKC is connected to the telephone line LT by the turned-on switch HS ¹ and the contact lk which is being restored, and a telephone conversation with the central office line is performed.

In addition, when performing a hold transfer, operate the hold key on the key/display circuit KDP and specify the transfer destination using the pushbutton dial PD.This operation data is given to the control circuit CT _n , and accordingly The same circuit CT _n operates relay HL, and the hold circuit
Turn on the HLD contact hl, close the hold loop with the hold resistor R _L , and turn on the telephone TEL ₁ .
~ Sends control data to TEL _o , flashes the office line indicator light, and sends control data to the forwarding destination phone, activates relay SP, restores relay TK, and activates the amplifier. A is turned on, while relay L is operated, and the oscillator
To activate OSC _n , the speaker SPK on the transfer destination phone rings with the central office line ring tone.

When the transfer destination telephone goes off-hook in response to this, a call is made between the extensions, and if the central office line key is then operated, a call is made to the central office line in the same way as described above. The data is given to the control circuit CT _n , which restores the relay _HL , thereby opening the holding loop.

When the call ends and on-hook is performed, this operation data is given to the control circuit CT _n , and in response, the circuit CT _n operates the relay L to open the central office line, and the telephones TEL ₁ to TEL Sends control data to _o , operates relay TK, and turns off the station line indicator light to enter standby mode.

Then, for example, when making a call from telephone TEL ₁ to the central office line, when the off-hook and central office line keys are operated on telephone TEL ₁ , these operation data are given to the control circuit CT _n , and the same operation is performed accordingly. Circuit CT _n restores relay L and connects the telephone line LT to the central office line, while the telephone
Send control data to TEL ₁ and relay TK
and connects the communication circuit TKC to the communication line LT, and also transmits control data to all telephones TEL ₁ to _{TEL o} to turn on their office line indicator lights.

Therefore, a display indicating that the office line is in use is displayed, the telephone call circuit TKC is connected to the office line, and the dial pulse generating circuit DPG operates in response to the operation of the pushbutton dial PD. Since the switch is turned on and off, dialing to the central office line can be made freely, and the call is completed when the other party responds.

In addition, if on-husk is performed due to the end of the episode,
The system enters a standby state as described above, and hold transfer is performed in the same manner as described above. However, when making a call, if the central office line key is operated before going off-hook, the operation data of the central office line key will be transferred to the control circuit CT even in the on-hook state. _n is detected, and in response, relay L is restored, control data is sent to telephone TEL ₁ , relay SP is operated and relay TK is restored, contacts tk and sp ¹ are turned on, and dialing is performed. Since the telephone call circuit TKC including the telephone switch is connected to the telephone line LT as a dialing circuit, on-hook dialing is possible, and the speaker SPK sounds in response to a response from the other party, thereby providing amplification.

In addition, when you operate the push button dial PD,
As a result, the control circuit CT _t responds, and the oscillation circuit
In order to activate OSC _t and turn on amplifier A, an operation sound is sent from speaker SPK.

In addition, for inter-extension calls, e.g.
With off-hook at TEL ₁ , telephone TEL ₂
When a dial operation is performed to specify , the operation data is given to the control circuit CT _n , and in response, the circuit CT _n operates the oscillator OSC _n for a certain period of time, and also controls the telephones TEL ₁ and TEL ₂ . After transmitting the data and restoring both relay TKs,
In order to operate relay SP of telephone TEL ₂ and turn on amplifier A, use the speaker of telephone TEL ₂ .
After the extension call acknowledgment tone is sent from SPK for a certain period of time, the ringing sound from telephone TEL ₁ is transmitted to telephone TEL _2.
is transmitted from the speaker SPK.

If telephone TEL ₂ answers by off-hook,
Depending on the operation data of this, the control circuit CT _n
In order to send control data to TEL ₂ and restore relay SP, the two parties enter a telephone conversation state, and when the call ends and an on-hook is performed, the control circuit CT _n responds to the operation data for both parties. Sends control data, operates relay TK, and puts it into standby mode.

In addition, if you receive a call from the doorphone DP,
The control circuit CT _n detects this via the doorbell control circuit DPC, starts the oscillator OSC _n , and
In order to send control data to telephones TEL ₁ to TEL _o to restore relay TK, operate relay SP, and turn on amplifier A,
When a doorbell ringtone is sent from SPK and one of the telephones goes off-hook in response, the control circuit CT _n stops the oscillation circuit OSC _n and controls the doorphone control circuit DPC according to the operation data. , while connecting the door phone DP to the primary winding of the transformer T _n , transmitting control data, and restoring the relay TK of the off-hook telephone to the recovery state, restoring the relay SP and turning off the amplifier A, By placing other telephones in the standby state, a call is made between the door phone DP and the off-hook telephone, and in response to the on-hook of the telephone, the entire system returns to the standby state in the same way as described above.

Please note that the doorbell is not activated during a call to the central office or extension line.
If there is an incoming call from the DP, or if there is an incoming call from the central office line during a call between extensions, the control circuit CT _n
sends control data to start the oscillator OSC _t and turn on amplifier A, so the speaker
The SPK is designed to send out a doorbell ringtone during a call or a central office line ringtone during an extension call.

FIG. 2 is a flowchart for the central office line based on the control of the control circuit _CTn , and the correspondence with the wording of the claims is as follows.

◎Hold operation detection means for detecting a hold operation of a key telephone set = Hold key operation and data reception processing ◎ Status determination means for determining the state of the telephone based on the hooked state and office line acquisition state of the button telephone set = Office line acquisition in progress? , Off-husk condition? Processing ◎Based on the output of the hold operation detection means and the output of the state determination means corresponding to the hold operation telephone, the telephone is controlled to be on hold when it is in the off-hook state and is acquiring a central office line, and is in any other state. Hold control means that sometimes invalidates hold operations〓
Processing of HL operation, L operation, and TK operation.

In this operation, when the telephone connected to the central office line operates the hold key during on-hook dialing or on-hook call amplification, the control circuit CT _n performs ``Receive hold key operation data'' and collates the information in the memory. Check whether relay L has been restored or not, and determine whether the station line is being captured.
Assuming that this is YES, the information in the memory is checked to determine if the telephone connected to the central office line is in an off-hook state? ” to judge.

In this case, if the phone is in a call state, is it in an off-hook state? ” becomes Y, and the relay
HL and L are controlled, relay ``HL operation'' and relay ``L operation'' are performed, the central line is put on hold, and control data is sent to the telephone to perform relay ``TK operation'' and the call is terminated. After disconnecting the circuit TKC from the telephone line LT,
Control data is transmitted to the telephones TEL ₁ to TEL _o , and each of them is caused to blink the office line indicator light.

In contrast to the above, if the telephone in question is on-hook dialing or amplifying the call, is it in an off-hook state? '' becomes N (NO), the above-mentioned operation is not performed, and the station line hold operation using the hold key becomes invalid.

That is, in this example, the control circuit CT _n operates as a station line acquisition determination means and an off-hook determination means, and invalidates the station line holding operation while the station line is being acquired and on-hook, thereby making the station line hold operation meaningless. This is intended to prevent the occurrence of a pending state.

However, in Figure 1, each telephone TEL ₁ ~
The TEL _o and the main device ME may be connected by individual communication lines and signal lines, and the same is true even if multiple office lines are accommodated in the main device ME, instead of the dial pulse generator DPG. Various modifications are possible, such as providing a dial signal generation circuit in the system and transmitting a dial signal using a composite frequency.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, even if a central office line hold operation is performed during on-hook dialing or during on-hook call amplification, this becomes invalid, thereby preventing the occurrence of a meaningless central office line holding state. Therefore, remarkable effects can be obtained in various key telephone devices.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; FIG. 1 is a block diagram showing the configuration, and FIG. 2 is a flowchart of the holding operation for the central office line. ME...Main equipment, TEL ₁ to TEL _o ...Telephone (button telephone), _L1 , _L2 ...Line terminal, LT...Talking line, LS...Signal line, CT _n , CT _t ...Control circuit ,
SR _n , SR _t ...transmission/reception circuit, HLD...holding circuit,
L, TK, SP...Relay, KDP...Key/display circuit.

Claims (1)

[Scope of Claims] 1. Consisting of a main device that accommodates a central office line and a plurality of key telephones connected to the main device, even when the key telephone is on-hook, dialing and receiving amplification for the central office line is possible. A button telephone device capable of performing the following: a hold operation detection means for detecting a hold operation of the button telephone; a state determination means for determining the state of the telephone based on a hooked state and a central line acquisition state of the button telephone; Based on the output and the output of the state determining means corresponding to the holding operation telephone, the telephone is controlled to be on hold when it is in an off-hook state and is acquiring a central office line, and the holding operation is performed when the telephone is in any other state. 1. A button telephone device, comprising: a holding control means for disabling a central line holding operation while the key telephone is on-hook.