JPS6042970A - Telephone set for private branch of exchange - Google Patents

Abstract

PURPOSE:To attain talking with excellent sound volume in any talking of extension mutual talking and talking with a trunk line by identifying the extension mutual talking and the talking with the trunk line and adding a loss to transmission/reception in case of the extension mutual talking. CONSTITUTION:A telephone set is provided with an incoming detector 10 discriminating an extension call signal from a trunk line call signal, operated by the extension call signal and not operated by the trunk line call signal, a dial detector 11 not operated when the 1st digit of the dial signal from a dial 5 is a specific number representing the calling to the trunk line and operated to other numbers, an OR circuit 12 ORing outputs of the incoming detector 10 and the dial detector 11, a transmission loss circuit 13 operated by an output of the OR circuit 12 and giving a loss to the transmission and reception, and a reception loss circuit 14. The telephone set detects the extension mutual talking by using the incoming detector 10 or the dial detector 11, gives a loss to the transmission by using the transmission loss circuit 13 and gives a loss to the reception by using the reception loss circuit 14.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a private branch exchange system (hereinafter referred to as rPBXJ).
Regarding telephones used in extensions. In particular, the present invention relates to a PBX telephone that eliminates the difference in volume between internal calls and central office calls.

[Explanation of conventional techniques and techniques]

FIG. 1 is a block diagram of a conventional PIBX telephone, and FIG. 2 is a diagram showing the usage pattern of the conventional example.

Conventionally, this type of telephone has, as shown in Fig. 1, FX terminals 1 and 2, which also serve as input and output of the telephone;
A hook switch 3, a ringer 4 that receives call number 43 and makes it sound, a dial 5, a two-wire four-wire conversion circuit 6,
It is composed of a balanced network 7, a transmitter 8 and a receiver 9.

This type of telephone can be used as a standalone subscriber 5'11, or as a PB
As shown in Fig. 282, telephones 20, 21 and 22 are the telephones shown in Fig. and 25 are connected to form f, r14.In other words, the PBX exchange 23 connects to the central exchange 24,
'% talk filling machines 0 and 2↓ are accommodated in this P B X 23. The telephone 22 is a single subscriber telephone housed in the central exchange 25.

1PBX to make a call between telephone 20 and telephone 21
There is clearly a difference in line loss between a PBX extension call and a PBX office line call between telephones 20 and 22. In the former case @ is 'telephone 20
The distance between the latter telephone 20 and the telephone 22 is
Compared to the distance, it is quite short, and there is less loss at Moriji in Episode III. As a result, an inconvenience arises in that the voice can be heard loudly when talking between internal lines, but at a low voice when talking to a central office line. In order to prevent this, when talking on the local line, the volume is set to be audible at an appropriate level, but when talking between internal lines, the volume is too loud, and in extreme cases, this has the disadvantage of causing ear pain.

The present inventor has completed the present invention by noting that this problem can be solved by incorporating a detection circuit, an OR circuit, and a loss circuit into a conventional telephone.

(Purpose of the Invention) The present invention provides a one-talk machine for PBX.
It distinguishes between calls and calls to the central office line, and in the case of internal and q mutual communication, +J is added to the sending and receiving calls, and a good volume is maintained for both internal calls and calls to the central office line. The purpose is to provide a 7L story for a PBX that can be used for telephone calls (β Reihiki I).

[Features of the invention]

The present invention is configured such that the internal line calling signal and the central office line 11-1' output signal are different, and the internal p4 call and the central office line call are distinguished at the 14'i7th dial operation. Telephones connected to the telephone switching system are equipped with an incoming call detector that distinguishes and distinguishes between Jd calling number I3 and a central office line calling signal, and a telephone terminal that detects whether the first digit of the dial operation is the internal one gland estrus or not. !-Dial detector to identify whether the call is an outgoing call; and a detection output when the above-mentioned incoming call detector detects an extension calling signal;
A logical sum circuit that receives as input the detection output of the dial detector detecting internal/easiness, and a circuit that is controlled by the output of this logic sum circuit and causes a loss to the crystal transmitting circuit and the receiving circuit. Preparation, mutual i+-l:+
The feature is to eliminate the difference in volume between voice and central line communications.

[Explanation based on examples]

Next, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 3 is a block diagram of a telephone according to an embodiment of the present invention. This embodiment telephone has five telephone output terminals 1 and 2, a hook switch 3 connected to this input/output terminal 1, a ringer 4 that receives a ringing signal and makes a sound, and a ringer 4 that gives a telephone number and sends a dialing signal. (i dial 5 and the above input/output end -
A two-wire four-wire conversion circuit 6 that converts the transmitted and received signals of J-1 and J-2, a balance circuit 7 that balances the two-wire four-wire conversion circuit 6, and a transmitter 8 connected to the four-wire transmitting side. and a receiver 9 connected to the receiver.

In addition to this basic configuration, the present invention includes an incoming call number detector 1 () which distinguishes between extension call number 1 and central office line calling signals, and which operates on extension calling signals and does not operate on local telephone call numbers. , it will not work if the first digit of the dial detector from dial 5 is a specific number indicating a call to a central office line (for example, the number "0"), and will not work for numbers outside of that range. An operating dial detector 11, an OR circuit that interweaves the outputs of the relay detector 10 and the dial detector 11.

12 and the output of the OR circuit 12 to transmit a call, respectively.
Transmission loss circuit 13 and reception R that cause loss of reception] Ii
A power supply circuit 14 is also provided.

This telephone detects that it is an internal intercom call at the incoming call (detection t10 or dial detector)1, causes a loss in the outgoing call in the outgoing call loss circuit 13, and causes a loss in the outgoing call (1i'i'l path 1).
・1 causes a loss in receiving calls.

Incoming call detector lOkan1. The number is in the call from the PBX, 3
Calls from 2 and calls from the central office line 1. Is there a difference between the evening edition and the present invention? -1: p n
It is necessary that the calling signals from x be different depending on whether they are from the extension line or the central office line. If the frequencies of output 47g ")" and ' are different by 9, the ring detector 10 outputs in tune with the frequency of the extension ringing signal, but does not tune in with the frequency of the central line ringing signal, and the output is output. ? , frequency 1,917 TI $,
'4 methods are used. As another example, there is a difference in the timing of the I-calling signal. For example, an extension call (K4+) is output for 2 seconds and is output for 1 second, whereas a central office line call signal is output continuously for 1 second. Use this to respond to the central office line calling signal (
A timing detection method is adopted that does not operate for 7 and operates for extension calls Gj.

The dial detector 11 measures all the first digits of the signal on the dial 5, and determines if the first digit is a specific number indicating a call to the central office line, such as "
0”, it is not output and other numbers, such as 1 to 9.
Output for.

In this way, in the case of a PBX extension call, the incoming call is detected by the incoming call detector 10, and the outgoing call is detected by the dial detector 11, and the outgoing call is detected by the outgoing call loss circuit 13 for sending and receiving calls. A receiving loss circuit 14 provides a loss,
To prevent the volume from becoming excessive during internal calls.

When the station '4 is talking, the sending loss circuit 13 and the receiving loss circuit 14 do not operate, so that the conversation can be made at an appropriate volume. On the other hand, if the telephone set has the transmitting and receiving gains set so that the sound volume is appropriate during a call on a central office line with a lot of line loss, the transmitting loss circuit 13 and the receiving line will be connected to the transmitting loss circuit 13 during a mutual call on an internal line with a small line loss. The loss circuit 14 imparts loss to the transmitting and receiving channels, thereby preventing excessive sound volume.

〔Effect of the invention〕

As explained above, according to the present invention, an excellent effect can be achieved in that excessive volume can be prevented during internal calls between internal lines by detecting internal calls using pBi and using the output to cause a loss in transmission and reception. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional PBX telephone. FIG. 2 is a diagram showing the state of use of the conventional example. FIG. 3 is a block diagram of a telephone set according to an embodiment of the present invention. 1', 2... Telephone input/output terminal, 3... Hook switch, 4... Ringer, 5... Dial, 6...
- Two-wire four-wire conversion circuit, 7... Balanced circuit network, 8... Transmitter, 9... Receiver, 10... Incoming call detector, 11.
...Dial detector, 12...OR circuit, 13...
・Sending loss circuit, 14...Receiving loss circuit, 20.21
．． 22...Telephone, 23゛...PBX, 24.25
... Central office exchange. 112I 1 32 B

Claims (1)

[Claims] (1) In a telephone connected to a private telephone exchange system, in which the extension calling signal and the central office calling signal are different, and the first digit of the outgoing dial operation is used to distinguish between an internal telephone call and a central office telephone call, a ring detector that distinguishes between a ringing signal and a central office line calling signal; a dial detector that identifies whether the first digit of a dial operation is an extension dialing or a central line dialing; The output is controlled by the output of the logical sum circuit, which receives the detection output when the incoming call detector detects an extension ringing signal, and the detection output when the dial detector detects an extension call, and the output of the ΩOR circuit. 1'E "filling machine" for private telephone exchange, characterized by being fully equipped with a circuit that causes loss to the speaking circuit and the receiving circuit.