JPS63309091A - Additional device for long-distance extension - Google Patents

Abstract

PURPOSE:To always enable speech in a proper level independently of the classification of this speech by identified the speech classification of a long-distance extension terminal and controlling the gain of a speech path of the long-distance extension in accordance with the identified classification. CONSTITUTION:For example, if a call comes to a long-distance extension terminal LSB, a central processing unit CC sends a call signal to the long-distance extension terminal LSB through an additional device ADP and a speech classification identifying part 3 identifies the transmission source of the incoming call, namely, the classification of the incoming call in accordance with the form of the call signal. The gain of the speech path of the long-distance extension is controlled by a gain control part 1 in accordance with the identified speech classification. Thus, speech in a proper level in the long-distance extension terminal is always possible independently of the distance of the speech path to the destination.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a long-distance extension fLK used when accommodating a long-distance extension in the extension of a telephone exchange, such as a button telephone or a private branch exchange. It is something.

[Prior art]

As shown in FIG. 3, within long distance to telephone exchange equipment EX;
When processing LL, a long-distance extension add-on device (hereinafter referred to as an add-on device) ADP having an amplification function to compensate for the attenuation of the call voice on the long-distance extension LL is installed in the telephone exchange e.
Provided between the EX extension terminal and the long distance extension LL.

The gain of amplification in the conventional IJD device ADP is set in consideration of calls between the long-distance extension terminal LSB and the outside, ICO, and the gain is also fixed.

[Problem that the invention seeks to solve]

According to the above conventional technology, the gain in the attached device tADP is set to compensate for both the line loss of the outside line CO and the sea path loss of the long-distance built-in LL. For long-distance calls, such as calls with the extension terminal SB, which are subject to only the line loss of the WLL, there is a problem in that the gain at the callback device ADP is too high, making it difficult to make calls.

The present invention is proposed to solve the above problems.

[Means for solving problems]

In order to solve the above problems, the present invention provides an additional device with a function to identify the call type of a long-distance extension terminal, and a function to control the gain of the long-distance extension call path in accordance with the identified call type. It is designed to be equipped.

[Action of the invention]

When one terminal in a call is a long-distance extension terminal, the gain of the additional device is controlled in accordance with the type of call, so that the call is always conducted at an appropriate level regardless of the type of call.

[Embodiments of the invention]

FIG. 1 is a block diagram of an additional device according to an example of the present invention;
FIG. 2 is a relay system diagram of a system using the additional device.

As shown in FIG. 2, the switch network SNW of the telephone exchange fEX includes additional devices ADP according to the present invention,
ADP, via long distance extension LL,.

LL is accommodated, and beyond that is a long-distance extension terminal LSB.

LSB is connected. This long-distance extension terminal may be a standard telephone, or may be some other intermittent switching device.

In addition to the above, the switch network SNW normally accommodates an extension terminal SB, an outside line CO via an outside trunk COT, etc., and the switch network SNW,
Caro mounting 41ADP, , Al)P, .

External line trunk COT and normal extension terminal SB are integrated by 1-1-J central processing unit 1cc! ill be controlled.

As shown in FIG. 1, the additional device ADP (the subscript is omitted when there is no need to distinguish between them. The same applies to other symbols Q) includes a bidirectional amplifier 101 and a changeover switch 10.
A dial signal receiving unit 2 that receives a dial signal from the ICC10 long distance extension terminal LSB and a dial signal received by this dial 4i receiving unit 2 or -P central processing unit CC incoming call type identification. It is equipped with a call type identification section 3 that identifies the call type based on information such as the form of a calling signal.

First, the operation when a call is made from the long distance extension terminal LSB will be explained.

When making a call from a long-distance extension terminal, for example, LSB ) and then dial the other party's subscription number.

Also, other long distance extension terminal LSB or normal extension terminal S
8, dial each extension number. In addition, the first digit of the extension number of the long-distance extension terminal LSB, LSB, is a specific number that is not used as the first digit of the normal extension terminal SB in order to distinguish it from the normal extension terminal SB. do.

The dial signal sent by the dial operation at the long distance extension terminal LSB is sent to the long distance extension LL, and the additional device AD.
The dial signal is input to the central processing unit +tt CC via P and is subjected to known control, and the dial signal is also received by the dial signal receiving section 2 in the additional device ADP itself and activated by the call type identification section 3. 0 The call type identification section 3 analyzes the first digit of the dial signal received by the dial signal reception section 2, and identifies the first digit.
When the dial signal of the digit is a signal corresponding to the first digit of the extension number of the outside line calling identification number or other long-distance extension terminal or SBt, the changeover switch 102 of the gain control unit 1
is operated to insert the bidirectional amplifier 101 into the long-distance extension line LL. Further, when the first digit dial signal is a signal corresponding to the first digit of the extension number of the normal extension terminal SR, the call type identification section 3 does not control the gain control section 1;
Therefore, the bidirectional amplifier 101 is not inserted into the long distance extension line LL.

The gain of the bidirectional amplifier 101 is for the outside line CO and the long distance extension line LL.
It is set to a value that compensates for the total line loss of the two long-distance iLLs or the total line loss of the two long-distance iLLs.
and two long-distance extension terminals LSB (LSB,...
LSB,) For calls between two parties, the voice of the call is amplified and is carried out between the long-distance extension terminal LSB and the normal extension terminal SB.
The voice of the call will be made without being amplified. In addition, in calls between the long-distance extension terminals LSB, , LSB, and the above-mentioned long-distance extension terminals, the additional device AD on the called side
In P, there is a bidirectional amplifier 101 in the long distance @LL.
is not inserted, and therefore the gain of the call voice in the call is the same as that in the call with the outside line CO.

Next, the operation when a long distance extension terminal LSB K call is received will be explained.

For example, when an incoming call occurs to the long-distance domestic terminal LS bird, the central processing unit tCC sends a paging signal to the long-distance domestic terminal LSB via the additional device IADP, and also makes a call based on the form of the paging signal. The type identification unit 3 identifies the source of the four calls (that is, the type of incoming call). That is,
Ringing signal and extension terminal S when receiving a call from normal outside line Co
Since the calling signal for incoming calls from B or LSB can be distinguished from each other by making the frequency or intermittent cycle different, for example, the calling signal can be identified from the form of the calling signal.

As a result of identifying the 71 incoming call type as described above, when it is determined that the incoming call to the long distance extension terminal LSB is an incoming call from the outside CO, the call type identifying unit 3 switches the gain control unit 1 to The switch 102 is operated to insert the bidirectional amplifier 101 into the long distance extension line LL. Further, when it is determined that the above-mentioned call is an incoming call from Ike's long-distance extension terminal LSB or normal extension terminal SB, the call type identification section 3 does not control the gain control section 1, and therefore, the long-distance extension LL, The bidirectional amplifier 101 is not inserted.

However, from long-distance extension terminal LSB to long-distance extension terminal LS
When a call is received to B, the bidirectional amplifier 5101 is inserted into the long-distance ILL of the originating side as described above, so that the long-distance extension terminals LSB, , LSB.

The voice of the communication between the two parties will be amplified.

As described above, in the same manner as the outgoing calls, outgoing calls are also made between the caller of the external CO and the long-distance extension terminal LSB, and the two long-distance internal vertical Mdai-1illil terminals LS.
For calls between B (LSB, LSB,), the voice of the call is amplified, and for calls between the long-distance extension terminal LSB and the normal extension terminal SR, the voice of the call is not amplified. .

In the embodiment described above, the gain control of call voice is performed in two stages. It is also possible to perform gain control in three or more stages, such as by setting the It may also be done in combination with a container. Further, in the above embodiments, an amplifier is used for gain control, but an attenuator may be used instead of an amplifier. In other words, if the speech level of the communication path excluding the additional equipment Wt and ADP is set based on the total line loss of the long-distance extension line LL and the external line CO, the bidirectional amplifier 1 in the additional equipment ADP
An attenuator is used in place of 01, and the attenuator is inserted into the long-distance inner edge LL during a normal call with the extension terminal SB.

〔Effect of the invention〕

As explained above, the present invention provides an additional device with a function (call type identification unit) for identifying the call type of a long-distance terminal, and a control function for controlling the gain of the call route of a long-distance domestic plane in accordance with the identified call type. This function (gain control section) has been added to the system, and has the effect that calls can always be made at an appropriate level regardless of the size of the call route to the other party.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the long distance extension line addition device according to the present invention, FIG. 2 is a relay system diagram of a system using the long distance extension addition device, and FIG. 3 is a diagram of a conventional system example. It is a relay system diagram. (Main symbols) EX... Telephone exchange bag [il Co... External line LL (
LL,,LL,)...Long distance extension AI)P(ADP,
, At) P, ) ,,, Long distance extension terminal LSB (LSBl, LSB,)...Long distance terminal S
B... Normal terminal 1... Gain control unit 3... Call type identification unit. Figure 1: Otsushi, 2nd ward, Figure 3

Claims (1)

[Claims] A device installed between the extension terminal of the telephone exchange and the long-distance extension when a long-distance extension is accommodated in the telephone exchange, which has a function of identifying the call type of the long-distance extension terminal and a function of identifying the call type of the long-distance extension. A long-distance extension device equipped with a function to control the gain of the long-distance extension call route according to the type.