JPS5839436B2 - Extension response connection method in button telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an extension response connection method in a key telephone device, and more specifically, to a hands-free response connection method when answering an extension.

In recent years, key telephone devices of this type have increasingly been constructed so that they can respond to central office lines and extension lines in a hands-free manner.

On the other hand, in the field of button telephone devices, emphasis has been placed on how to reduce the number of cables that require dozens of core wires, and as part of this effort, the reduction of cable core wires has been attracting attention in recent years.

Particularly in models with a small number of station lines and extension lines (or number of button telephones accommodated), an increase or decrease in the number of core wires can have a large effect on the overall configuration of the device.

For example, the wiring cable used for this type of equipment is usually 2
The number of accommodated cores is determined as 0 cores, 40 cores, 60 cores, and 100 cores, and one of these is used depending on the scale of the device.

Therefore, if you want to improve the functionality of a particularly small model that uses a 20-core cable, you must either use a 40-core cable on the rise, or add a new wire to increase the functionality, which limits the ability to add functionality. There were problems not only in terms of economic efficiency but also in terms of economic efficiency.

That is, the following problems have occurred in the conventional button telephone device using the hands-free one-way type.

FIG. 1 is a diagram showing a conventional example in which a hand-free system is adopted for extension response.

When making an extension call and answering call between key telephones connected in multiple ways to the main unit EX, when the caller's 1-button telephone (hereinafter referred to as the I61 position) raises the hook switch H8, the telephone current supply circuit is activated. An extension call button B to which the NT supplies talking current and which then presses the called telephone (e.g. 42) to call the extension.
When you press K2, the power supply ■ connects to 42 through the extension calling line PL2.
Calling amplifier R-AMP and transmitting amplifier T-AMP
is supplied to

Therefore, when the called party is called by voice from the transmitter T of the calling party's handset, the voice signal is input to the hybrid circuit HYB provided in the main device via the extension telephone line TL.

The audio signal output from the output terminal is sent to the main amplifier M-AM.
/f is input to P and is amplified via the voice call signal line SL.
The signal is input to a ring amplification device R-AMP located at 62 positions, is further amplified, and is output from a speaker SP to make a voice call.

When the called party is called by voice call and responds by extension hands-free, it is sufficient to make a voice response to the microphone MIC, and the voice response signal is amplified by the transmitting amplifier T-AMP and output. The signal is input to the hybrid circuit HYB in the main device via the response line ML.

The output is inputted to the calling side's 4'1 telephone communication network via the extension telephone line TL and can be listened to by the telephone receiver H.

That is, a call can be made hands-free between extension telephones on the calling side using the transmitter T1 and handset R, and on the called side using a speaker and a microphone.

In addition, when calling AIT'EL from 42 TEL to make an extension call, press the extension call button BK1 corresponding to the called party at 41, and the extension call and call will be made by the same circuit operation as described above. It is possible.

As described above, in the conventional key telephone device t using the extension hands-free system, it was necessary to provide a response line ML specifically for the extension hands-free system.

Therefore, if there are no extra core wires accommodated in the distribution cable used for the equipment, or if it is not possible to use cables with even more cores due to economic reasons, new functionality cannot be improved. There was a drawback.

The present invention was developed in order to eliminate the above-mentioned drawbacks, and in a key telephone device using an extension hands-free one-way system, an extension calling line which has been wired conventionally without using an answering line for hands-free calling is used. The cable is configured to send a voice response signal from the called side to the calling side using the cable, and the number of core wires in the cable is reduced, or the surplus core wires are used to add other new functions such as simultaneous paging. It is configured so that it can be done.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention, and the same parts as in FIG. 1 are denoted by the same symbols.

In this first embodiment, the power input of the transmitting amplifier T-AMP provided in each telephone is configured to be supplied from the extension calling line (extension calling line) PL, as in the conventional example. However, the audio output from the transmitting amplifier T-AMP is configured to be returned through the extension calling lines PL1 to PLn.

On the main device EX side, extension call detection relays 1 to Kn are provided corresponding to extension call lines PL1 to PLn, and a hybrid circuit HYBI is connected to the contacts thereof via 1 to Kn.

In other words, for the extension calling line PL, there is an extension call detection relay for the extension calling line PL.
A contact point 1 is provided between the extension calling line PL2 and the hybrid circuit HYB.

Similarly, contact 2 is provided between extension calling line PL3 and hybrid circuit HYB, and contact Kn is connected to extension calling line PL1.

With such a circuit configuration, the extension calling operation is performed as follows.

When the /I61 button telephone on the calling side raises the hook switch H8 and presses the extension calling button BK2 to call the extension of the called telephone (for example, A2 position), the power supply ■ switches to the extension calling line P.
2 to the extension ring detection relay via L2, and the ring amplifier R- of A2 via the extension line PL2.
AMP and the transmit amplifier T-AMP.

In this state, when the calling party makes a voice call, the voice signal is input to the call amplifier RAMP located at A2 via the hybrid circuit HYB, the main amplifier M-AMP, and the voice call signal line SL, and is transmitted from the speaker SP. Output.

When the called party makes an answer call to the microphone MIC in order to answer by extension hands-free, the voice signal is inputted to the hybrid circuit HYBI through the extension calling line PL3 and the previously activated contact 2, and the extension call is answered. The telephone number is transmitted through the telephone line (extension line) TL and output from the telephone receiver of the calling party, and mutual communication is performed using the extension line.

Similarly, when calling A n T E L, press the extension call button BKn to activate the extension call detection relay Kn and the transmitting amplifier T-AMP located at An. It is sent out via line PL1 and contact Kn.

In addition, in the middle of the loop in which the voice response signal from the called side MIC is sent to the hybrid circuit HYB in the main device, a third party's ringing amplifier R-AMP and transmitting amplifier T- are installed. AMP is connected, but since the power supply for starting each amplifier is not generated in this loop E, the voice response signal is not directly connected to the power supply, and the voice response signal is not deactivated. It is also conceivable that some of it flows into each amplifier and is lost.

Therefore, it goes without saying that by lowering the output impedance of the transmit amplifier TAMP, the circuit can be configured to such an extent that the loss can be ignored.

In this way, in the present invention, one extension calling line is automatically switched to be used for calling at some times and for answering at other times, and in the case of extension calling, a direct current is used. It is formed so that it becomes a path through which AC signals flow, and in the case of a response, it becomes a path through which AC signals are sent back.

Note that power is supplied to the calling amplifier R-A-MP and the transmitting amplifier TAMP by a separate circuit (not shown) when the extension calling button BK is a non-locking type. When the extension hands-free call ends, hook-down information from the calling party is detected by a detection circuit (not shown) and the power supply is cut off.

As described above, the present invention has the advantage that the number of core wires of a distribution cable can be reduced or that the extra core wires can be used to implement other new functional amplifiers, and is therefore extremely effective in practice.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of the main parts of a conventional button telephone device, and FIG. 2 is a circuit diagram of the main parts of the button telephone device of the present invention. TL...Extension calling line, PL...Extension calling line, SL...Voice calling signal line, M-AMP...
...Main amplifier, R-AMP... Calling amplifier, T-AMP... Transmitting amplifier, K1 to Kn.
...1~Kn for extension call detection relay...
Extension call detection relay contact.

Claims (1)

[Scope of Claims] 1. A main device and a plurality of key telephones are connected in a duplex manner via extension communication paths, and the called party responds hands-free to a single extension call from the calling party via the extension communication path. A button telephone device using an extension hands-free response system, characterized in that a hands-free response signal from the called party is sent to the calling party via the extension call line. Extension response connection method in the device. 2. An extension in the button telephone device according to claim 1, wherein the hands-free response signal is configured to be transmitted by a switch of an extension call detection means provided in the main device. Response connection method.