JPH0767150A - Speech level correction system - Google Patents

Abstract

PURPOSE:To make a drop in the level of speech at a two-line part different, subscriber by subscriber, since the distances between subscriber terminals and an origination-side exchange are different, subscriber by subscriber, and to correct the drops in speech level, which are different by the subscriber, subscriber by subscriber. CONSTITUTION:The PB signal from an originating subscriber terminal 6 is received by a PB signal receiving trunk 1a and compared with the reference value of the PB signal. According to the comparison result, a control part 2a controls the variable PAD of the subscriber circuit 3a to correct the speech level between the origination-side exchange and an originating subscriber terminal 6. Further, the control part 2a sends the calculation result from the PB signal receiving track 1a through a common line signal network 5. According to the information from the common line signal network 5, a termination-side exchange controls the PAD of the subscriber circuit 3b to correct the speech level between the origination-side exchange and originating subscriber terminal 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice level correction system, and more particularly to a voice level correction system in an exchange forming a circuit switching network having a common signaling network.

[0002]

2. Description of the Related Art In a conventional circuit switching network, a transmission line loss exists in a subscriber line composed of two lines between a subscriber exchange and a subscriber terminal. For this reason, in the call between the subscriber terminals, mutual loss is added and the level of the signal within the voice band is lowered.

[0003]

In the conventional circuit switching network, there is a problem that the voice during a call may be difficult to hear when the distance of the subscriber line becomes long. Also,
In the case of a facsimile, there is a problem that communication may not be possible. The present invention has been made to solve such a problem, and an object of the present invention is to obtain a voice level correction system that corrects a decrease in voice level that differs for each subscriber.

[0004]

According to the voice level correction system of the present invention, in an exchange forming a circuit switching network having a common signaling network, an amplification function for amplifying a voice band signal to be sent to a subscriber terminal and an external device are provided. A subscriber circuit having a more controllable variable PAD, a measuring function connected to the subscriber circuit via a switch to measure a PB signal level together with a PB signal receiving function, and a measurement result and a reference level by the measuring function. And a function of sending the level comparison value information from the PB signal receiving function together with the calling information to the common line signal network and the common line signal. Extraction function for extracting level comparison value information from call information from the network and the above PB
It is provided with a signal receiving means and a control means for controlling the variable PAD of the subscriber circuit according to the information from the extracting function.

[0005]

In the present invention, the transmission line loss of the communication path in the two-line portion between the calling subscriber terminal and the calling exchange is corrected.

[0006]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
In FIG. 1, 1a is a PB signal receiving trunk connected to a calling subscriber terminal 6 when a call is made, 1b is a PB signal receiving trunk connected to a called subscriber terminal 7 when a call is called, 2a is a control unit of a calling side exchange Then, the control unit 2a controls the variable PAD in the subscriber circuit 3a based on the level comparison value information from the PB signal receiving trunk 1a. Also, the calling information and the level comparison value information are sent together to the common line signaling network 5. 2b
Is a control unit of the destination exchange, and this control unit 2b controls the variable PAD in the subscriber circuit 3b by extracting the level comparison value information from the call information from the common line signaling network 5. 4a and 4b
Is the control units 2a and 2b of the originating and terminating exchanges.
The switches are respectively controlled by.

FIG. 2 shows the subscriber circuits 3a and 3b in FIG.
3 is a block diagram showing a configuration example of FIG. In this FIG.
Reference numeral 8 is a digital code / decoding unit for converting the voice from the exchange in the call to the subscriber terminal from digital to analog, and the voice from the subscriber terminal to the exchange from analog to digital, and 9 is the digital code / decoder. Decoding section 8
An amplifier 10 for amplifying an analog signal from the amplifier receives the audio signal output from the amplifier 9 as an input, and a variable PAD for correcting the audio signal level under the control of the control unit, 11 for the audio signal corrected by the variable PAD 10. 2 lines (2
2 lines / converted to wire signals and sent to subscriber terminals
It is a 4-line conversion unit. The subscriber circuit 3 shown in FIG. 2 has an amplifying function for amplifying a voice band signal to be sent to the subscriber terminal and a variable PAD 10 which can be controlled from the outside.

FIG. 3 is a block diagram showing a configuration example of the PB signal receiving trunks 1a and 1b in FIG. This Figure 3
In the figure, 12 is a PB signal receiving circuit that receives a PB signal at the time of calling and sends the number information to the control unit, and 13 is a PB signal level measurement that inputs the PB signal at the time of calling and measures the level of the PB signal. The circuit 14 is a comparator for comparing the measurement result from the PB signal level measuring circuit 13 with the reference level 15 and outputting the comparison result to the control unit.

The PB signal receiving trunks 1a and 1b are connected to the subscriber circuits 3a and 3b through the switches 4a and 4b, respectively, and a measuring function for measuring the PB signal level together with the PB signal receiving function and this measuring function are provided. PB signal receiving means having a comparison function of calculating the difference by comparing the measurement result by the reference level with the reference level. Further, the control units 2a and 2b transmit the level comparison value information from the PB signal receiving function to the common line signaling network 5 together with the calling information and the level comparison value from the calling information from the common line signaling network 5. The extracting function for extracting information, the PB signal receiving means, and the control means for controlling the variable PAD of the subscriber circuits 3a and 3b are constituted by the information from the extracting function.

The operation of the embodiment shown in FIGS. 1 to 3 will be described below. First, when making a call from a subscriber terminal, the PB signal receiving trunk 1 is connected to the calling subscriber terminal 6 by a switch 4 as is well known. Then, the PB signal to be dialed when making a call is sent to the control unit 2 as number information by the PB signal receiving circuit 12. Further, the PB signal measuring circuit 13 measures the PB signal level, the comparator 14 compares the PB signal measurement result with the reference level 15, and outputs the level comparison value information to the control unit 2. Then, as is well known, the control unit 2a of the originating exchange sets the path to the terminating exchange by controlling the switch 4 based on the number information from the PB signal receiving circuit 12.

Next, based on the level comparison value information from the comparator 14, the control unit 2a lowers the level in the variable PAD 10 in the subscriber circuit 3 if the level of the received PB signal is lower than the reference level 15, for example. Control to supplement the minute. Also, the level comparison value information is sent to the common line signaling network 5 together with the calling information. Then, the control unit 2b of the destination exchange
Is the level comparison value information extracted from the calling information received from the common line signaling network 5, and based on the extracted level comparison value information, for example, if the level of the received PB signal is lower than the reference level, the subscriber circuit 3 The variable PAD 10 in the inside is controlled so as to compensate for the decrease in the level. With the above operation, the voice level between the calling subscriber terminal and the calling exchange can be corrected.

[0012]

As described above, according to the present invention, the transmission line loss of the communication path in the two-line portion between the calling subscriber terminal and the calling exchange is corrected. It has the effect that it can be guaranteed.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration example of a subscriber circuit in FIG.

3 is a block diagram showing a configuration example of a PB signal reception trunk in FIG.

[Explanation of symbols]

 1a, 1b PB signal receiving trunk 2a, 2b control unit 3a, 3b subscriber circuit 4a, 4b switch 5 common line signaling network 6 originating subscriber terminal 7 destination subscriber terminal 8 digital code / decoding unit 9 amplifier 10 variable PAD 11 2-wire / 4-wire converter 12 PB signal receiving circuit 13 PB signal level measuring circuit 14 Comparator 15 Reference level

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[Procedure amendment]

[Submission date] June 9, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

According to the voice level correction system of the present invention, in an exchange forming a circuit switching network having a common signaling network, an amplification function for amplifying a voice band signal to be sent to a subscriber terminal and an external device are provided. A subscriber circuit having a more controllable variable PAD, a measuring function connected to the subscriber circuit via a switch to measure a PB signal level together with a PB signal receiving function, and a measurement result and a reference level by the measuring function. And a function of sending the level comparison value information from the PB signal receiving function together with the calling information to the common line signal network and the common line signal. Extraction function for extracting level comparison value information from call information from the network and the above PB
It is provided with a signal receiving means and a control means for controlling the variable PAD of the subscriber circuit according to the information from the extracting function. In addition, the subscriber circuit (3a, 3b) is
Audio from the exchange to the subscriber terminal is converted from digital to analog.
The audio from the subscriber terminal to the exchange is recorded in the log.
Digital code to convert from analog to digital respectively /
The decoding unit (8) and the analog from the digital coding / decoding unit
An amplifier that amplifies the log signal (9)
Sound signal is input, and a sound is generated by the control of the control means (2a).
Variable PAD (10) that corrects the level of the voice signal, and variable
Convert the voice signal corrected by PAD into a two-line signal and add
2-wire / 4-wire conversion unit (1 that sends to the entrance terminal (6, 7)
It is composed of 1) and. Also, the PB signal receiver
The stages (1a, 1b) receive the PB signal at the time of calling and
PB signal receiving circuit (12) for sending signal information to control means
And input the PB signal at the time of calling and measure the level
PB signal level measurement circuit (13) and PB signal level measurement
Compare the level measured by the constant circuit with the reference level and
From the comparator (14) for sending the comparison result of
It is composed.

Claims (1)

[Claims] 1. An exchange function constituting a circuit switching network having a common line signaling network, an amplifying function for amplifying a voice band signal to be sent to a subscriber terminal, and a variable PA controllable from the outside.
A subscriber circuit having D, a measuring function connected to the subscriber circuit via a switch to measure the PB signal level together with a PB signal receiving function, and a measurement result by the measuring function and a reference level are compared to obtain a difference. And a function of sending the level comparison value information from the PB signal receiving function together with the calling information to the common line signaling network, and a call from this common line signaling network. A voice level correction method comprising: an extraction function for extracting level comparison value information from information, a PB signal receiving means, and a control means for controlling a variable PAD of the subscriber circuit according to the information from the extraction function.