JPH04243352A - Telephone transfer device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention connects two housed external lines, transfers incoming calls from one external line to the other external line, and makes it possible to make a call between the two external lines. This invention relates to a telephone transfer device.

0002

2. Description of the Related Art A telephone transfer device used for transferring an incoming call to a telephone at the destination when one leaves one's seat, for example, is applied to a button telephone device. In this case, the extension telephone connected to extension 1 is removed, the extension telephone connected to extension 2 is also removed, and a transfer telephone device is connected between extension 1 and extension 2. Then, the incoming call received on the first external line stored in the main device is connected to extension 1, and the second external line stored in the main device, which will be extended to the forwarding destination, is connected to extension 2. It is known to perform telephone transfer between a first outside line and a second outside line.

Furthermore, one telephone set accommodates two outside lines, and a switching circuit connects the two outside lines to a forwarding telephone device to transfer a call.If no call forwarding is to be performed, the switching circuit There are also known devices in which the outside line is connected to the communication circuit.

0004

[Problems to be Solved by the Invention] In the conventional telephone transfer device as described above, the voice signal from the incoming outside line is transferred without being amplified, or even if it is amplified, the voice signal is not amplified in advance to compensate for line loss. In the former case, the volume level of a call is generally low, because it is simply amplified by an amplifier with a fixed gain, and in the latter case, the volume level of a call becomes too loud or too low depending on the line conditions of the outside line. In any case, there is a problem in that it is difficult to always communicate at an optimal volume level.

SUMMARY OF THE INVENTION An object of the present invention is to provide a telephone transfer device that overcomes the problems in the prior art and allows a call to be made at an optimal volume level at all times.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a telephone transfer device that includes a bidirectional amplifier that amplifies the audio signal to be transferred, and a
The device was equipped with a PB receiver that receives a B signal and a control circuit.

[0007]

[Operation] The control circuit determines when the control signal received by the PB receiver is a signal indicating the volume adjustment mode sent from the caller, and then controls the control signal received by the PB receiver. As a control signal for the volume level, the gain of one or both of the bidirectional amplifiers is controlled accordingly. This realizes a telephone transfer device that can always communicate at an optimal volume level.

[0008]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 1 is a telephone A connected to an outside line 1;
2 is a telephone B that is connected to the outside line 2; 3 is the main unit of the key telephone device; 4 is a transfer telephone device; 5 is an outside line interface circuit that accommodates the outside line; 6 is a connection between an extension line and an outside line, or between an extension line and an extension line. a switching circuit; 7 is an extension interface circuit for accommodating extension lines; 8-1 and 8-2 are bidirectional amplifiers that amplify and increase the volume of upstream and downstream calls, respectively; 9;
is the P that receives the PB signal sent out via the communication path.
B receiver; 10 is a data transmitting/receiving circuit that receives control signals from the extension and sends control signals to the extension; 11 is a control circuit that controls various circuits within the transfer telephone device 4;

This embodiment is an example in which a transfer telephone device is connected to a key telephone device, and the extension telephone that would normally be connected to the two extensions from the main device 3 is removed, and a transfer telephone is connected instead. This is an example in which device 4 is connected.

In reality, a key telephone device usually accommodates a plurality (two or more) outside lines and a plurality (two or more) extension lines, but in this embodiment, the illustrations and explanations are simplified. Therefore, we have two external lines and two internal lines. Further, although the extension lines are shown as being star-wired, they may be bus-wired. Note that a control circuit is naturally necessary as a circuit for the main device 3, but it is not shown because it has no direct relation to the present invention.

Referring to FIG. An outside line 1 to which a telephone (A) 1 is connected and an outside line 2 to which a telephone (B) 2 is connected are accommodated in the main device 3. Further, as mentioned above, a transfer telephone device is connected to the extensions 1 and 2 housed in the main device 3 instead of the extension telephone. In the main device 3, an outside line 1 and an outside line 2 are connected to an outside line interface circuit 5, and are further connected to an extension line 1 and an extension line 2 via a switching circuit 6 and an extension line interface circuit 7.

[0012] Here, it is assumed that the telephone set (A) 1 and the telephone set (B) 2 are in a communication state between each other in the telephone transfer mode, and therefore the outside line 1 accommodated in the outside line interface circuit 5 and the extension line interface circuit are connected to each other. The extension line 1 housed in the extension line 7 is connected by the exchange circuit 6, and the external line 2 housed in the outside line interface circuit 5 and the extension line 2 housed in the extension line interface circuit 7 are connected by the exchange circuit 6. It is assumed that

Then, the voice signal from the telephone (A) 1 is transmitted to the extension line 1 via the outside line interface circuit 5, the exchange circuit 6, and the extension line interface circuit 7, and further to the bidirectional amplifiers 8-1 and 8-2. It is transmitted to the extension line 2, and from there is transmitted to the telephone set (B) 2 via the extension line interface circuit 7, the exchange circuit 6, and the outside line interface circuit 5. The voice signal from telephone (B) 2 is also routed in the opposite direction to telephone (
A) 1 and thus the telephone (A) 1 and the telephone (
B) A telephone call is made with 2 in telephone transfer mode.

On the other hand, in the transfer telephone device 4, extension 1
A PB receiver 9 is connected between the PB receiver 9 and the extension 2. The PB receiver 9 is connected to the telephone (A) 1 and the telephone (B).
It is possible to receive a PB signal (push button dial signal) from 2. Control signals sent via extensions 1 and 2 are transmitted to the control circuit 11 via the data transmitting/receiving circuit 10, and control signals from the control circuit 11 are also transmitted to the main device 3 via the data transmitting/receiving circuit 10. It is now possible to convey.

By the way, when the telephone (A) 1 and the telephone (B) 2 are in a conversation state in the telephone transfer mode via the main device 3, extensions 1 and 2, and the transfer telephone device 4, the telephone (A)
) If you want to increase, decrease, or change the volume level of the call on the side of phone (A) 1, first press the predetermined number or mark "*" or "#" from the side of telephone (A) 1. A function button signal like the mark is sent out as a PB signal. Then, the PB receiver 9 receives this PB signal and transmits it to the control circuit 11 through the route indicated by the broken line.

When the control circuit 11 learns of the reception of this specific PB signal, it shifts to the volume adjustment mode, and then changes the volume level change signal (volume level change signal) that is supposed to be sent from the telephone (A) 1 side. It enters a state where it waits for a signal that specifically specifies an increase or decrease. In this state, a volume level change signal is sent from the telephone (A) 1 as a PB signal in the form of a numeric dial, which is received by the PB receiver 9 and notified to the control circuit 11.

The control circuit 11 thereby controls the telephone (A
) The volume level specified by side 1 is increased or decreased by adjusting bidirectional amplifiers 8-1 and 8-2. In this way, it is possible to conduct a call in the transfer mode between the telephone (A) 1 and the telephone (B) 2 at an optimal volume level. Needless to say, it is possible to issue a command to change the volume level from the telephone (B) 2 side in a similar manner.

FIG. 2 is a block diagram showing another embodiment of the invention. In this figure, the same parts as in FIG. 1 are given the same reference numerals. In addition, 12 is a switching circuit;
13 is a communication circuit. Note that the transfer device 4 is provided with a control circuit as in the case of FIG. 1, but is omitted from illustration for the sake of simplicity and ease of understanding.

In this embodiment, two outside lines are accommodated in one terminal device via the outside line interface circuit 5. When used as an ordinary telephone, the switching circuit 12 is used to communicate with the outside line interface circuit 5. A connection is made between the circuit 13 and the circuit 13. When used as a telephone transfer device,
The switching circuit 12 connects the transfer telephone device 4 to the outside line interface circuit 5. The circuit operation for changing the volume level in the transfer telephone device 4 is the same as that described above with reference to FIG. 1, so it will not be repeated.

FIG. 3 is a block diagram showing a circuit arrangement close to the actual bidirectional amplifiers 8-1 and 8-2 in FIG. 1 or 2. In FIG. In FIG. 3, 14-1 and 14-2 are 2-wire and 4-wire conversion circuits, respectively, which are inserted and connected before the bidirectional amplifier when the extension line communication path is of an analog type. If the extension is a digital 4-wire type, a 2-wire/4-wire conversion circuit is not required).

The bidirectional amplifiers 8-1 and 8-2 each consist of an amplifier on the transmitting side and an amplifier on the receiving side, and the volume level of the call is normally adjusted by the bidirectional amplifiers 8-1 and 8-2.
2, this is performed for both amplifiers on the transmitting side and on the receiving side.

[0022]

[Effects of the Invention] As explained above, according to the present invention,
When calling in transfer mode using a telephone transfer device, the advantage is that regardless of the installation location of the transfer telephone device or line conditions, the caller can operate the call at the optimal volume level, improving call performance. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the invention.

FIG. 3 is a block diagram showing an actual circuit arrangement of the bidirectional amplifier in FIG. 1 or 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...Telephone A, 2...Telephone B, 3...Main device of button telephone device, 4...Transfer telephone device, 5...External line interface circuit, 6...Switching circuit, 7...Extension line interface circuit, 8-1
, 8-2... Bidirectional amplifier, 9... PB receiver, 10... Data transmission/reception circuit, 11... Control circuit, 12... Switching circuit, 1
3...Telephone circuit.

Claims (1)

[Claims] Claim 1. A telephone transfer device that connects two accommodated external lines, transfers an incoming call from one external line to the other external line, and makes it possible to make a call between the two external lines, comprising: a bidirectional amplifier inserted and connected between the two external lines, a PB receiver that receives a PB signal transmitted from either of the external lines, and a control signal received by the PB receiver that indicates a volume adjustment mode. When it is a signal,
a control circuit that determines this, uses the control signal received by the PB receiver as a volume level control signal, and controls the gain of one or both of the bidirectional amplifiers accordingly. A telephone transfer device characterized by: