JPH08293902A - Method and device for automatic sound volume level adjustment of push-button telephone set - Google Patents

Abstract

PURPOSE: To improve speech quality by detecting the reception level of a PB signal sent out from a push-button telephone set provided with a PB signal delivery function, calculating attenuation quantity due to transmission loss from the reception level and automatically adjusting a transmission/reception level corresponding to the attenuation quantity. CONSTITUTION: This push-button telephone set 3 receives the PB signal sent out from the push-button telephone set 1 by a PB signal reception circuit 31. The reception level of the PB signal is detected by a level detection circuit 32. A control circuit 33 calculates the attenuation quantity due to the transmission loss from a detected reception level, and informs level adjusting information to correct the attenuation quantity to a level adjusting circuit 34. The level adjusting circuit 34 performs the level adjustment of transmission/reception level of voice signal by the level adjusting information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone, and more particularly to a key telephone having a function of automatically adjusting a voice signal level by receiving a PB signal.

[0002]

2. Description of the Related Art A conventional key telephone has a reception level adjusting section for adjusting the level of a received voice signal, and the reception level is judged by the volume heard by a subscriber during a call. Adjustment.

[0003]

This conventional button telephone has a problem that the subscriber must adjust the reception level by himself / herself during a call. Further, since there is no adjustment function of the transmission level, it is necessary for each subscriber who is talking to adjust the reception level.

The present invention detects the reception level of the PB signal transmitted from the key telephone of the other party having the PB signal transmission function, calculates the attenuation amount due to the transmission loss from the detected reception level, and calculates the attenuation amount. The purpose is to improve the call quality by automatically adjusting the transmission / reception level according to.

[0005]

In order to achieve the above-mentioned object, a PB signal is sent to the calling party subscriber to send a PB signal.
The signal is received, the reception level of the received PB signal is detected, the amount of attenuation due to transmission loss is calculated from the reception level of the PB signal, and the level adjustment amount of the transmission / reception level is determined according to the amount of attenuation. Is calculated and the level adjustment amount is determined, and the transmission / reception level is automatically adjusted.

The PB signal receiving means for receiving the PB signal, the level detecting means for detecting the receiving level of the received PB signal, and the attenuation amount due to the transmission loss are calculated from the receiving level of the PB signal detected by the level detecting means. A PB signal is provided by having a control means for calculating and determining the level adjustment amount of the reception level and the transmission level according to the attenuation amount, and a level adjustment means for adjusting the reception level and the transmission level by the control means. The audio signal level is automatically adjusted by receiving.

[0007]

In the automatic volume level adjusting device for a key telephone having the above-mentioned structure, the reception level of the PB signal transmitted from the key telephone having the PB signal transmitting function is detected, and the attenuation amount due to the transmission loss is detected from the detected level. Calculate and notify the level adjustment circuit of level adjustment information to correct the attenuation amount,
As a result, the level of the transmission / reception level of the audio signal is automatically adjusted.

[0008]

The present invention will be described below with reference to the drawings.

FIG. 1 is a flowchart showing a processing procedure of a volume level automatic adjusting method for a key telephone using one embodiment of the present invention. When a call is made between the subscribers via the general public telephone network 101, when the reproduced voice level is low and it is difficult to hear 102, in step 103 the partner subscriber operates the push button to receive the PB signal. . In step 104, the reception level of the received PB signal is detected, in step 105, the control circuit calculates the attenuation amount due to the transmission loss from the reception level of the PB signal, and in step 106, the transmission / reception level of the transmission / reception level is determined according to the attenuation amount. Determine level adjustment amount, and step 10
At 7, the transmission / reception level is adjusted. In this way, the processing of the volume level automatic adjusting method of the present invention is executed.

Next, FIG. 2 is a system configuration diagram showing an embodiment of the present invention. A voice level reproduced by the key telephone 3 when the subscribers of the key telephone 1 and the subscriber of the key telephone 3 make a call by establishing a line between the key telephone 1 and the key telephone 3 via the general public telephone network 2. If it is low and difficult to hear, the caller is requested to send a PB signal by the push button operation of the key telephone 1. In the key telephone 3, the PB signal receiving circuit 31 receives the PB signal transmitted by the key telephone 1. PB signal receiving circuit 3
The level detection circuit 32 detects the reception level of the PB signal received by 1 and notifies the control circuit 33 of the result. In the control circuit 33, based on the reception level of the PB signal notified by the level detection circuit 32, P due to the transmission loss between the transmission paths of the button telephone 1 and the button telephone 3
The attenuation amount of the B signal is calculated. Then, the level adjustment circuit 34 is notified of the level adjustment information for correcting the reception level in the key telephone 3 and the transmission level to the key telephone 1 according to the calculated attenuation amount. The level adjusting circuit 34 adjusts the reception level of the voice signal from the key telephone 1 and the transmission level of the voice signal to the key telephone 1 according to the level adjustment information from the control circuit 33.

As described above, when the line is set up between the key telephone 1 and the key telephone 3, the key telephone 3 receives the PB signal from the key telephone 1 so that the key telephone 1 and the button telephone 3 receive the PB signal. The voice signal level between the telephones 3 is automatically adjusted by the key telephone 3 according to the attenuation amount due to the transmission loss calculated from the reception level of the PB signal.

[0012]

As described above, according to the present invention, the transmission loss is calculated from the PB signal, and the function of automatically adjusting the transmission / reception level according to the transmission loss between the key telephones is added. This has the effect of improving call quality and operability of the telephone.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing procedure of an embodiment of the present invention.

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

[Explanation of symbols]

1 button telephone 2 general public telephone network 3 button telephone 31 PB signal receiving circuit 32 level detection circuit 33 control circuit 34 level adjusting circuit 102 processing for the caller to judge whether the volume heard from the handset is difficult to hear 103 PB signal receiving processing 104 PB Signal reception level detection processing 105 Attenuation calculation processing 106 Level adjustment amount determination processing 107 Level adjustment processing

Claims (2)

[Claims] 1. A method for automatically adjusting a voice signal level of a key telephone having a PB signal sending function, wherein a PB signal is received by a calling party subscriber, and the received PB signal is received. Of the PB signal, the amount of attenuation due to transmission loss is calculated from the received level of the PB signal, and the level adjustment amount of the transmission / reception level is determined according to the amount of attenuation. A method for automatically adjusting the volume level of a button telephone, which makes a decision and automatically adjusts the transmission / reception level. 2. A key telephone set comprising: a PB signal receiving means for receiving a PB signal; a level detecting means for detecting a receiving level of the received PB signal; and a PB signal receiving level detected by the level detecting means. A control unit that calculates the attenuation amount due to the transmission loss and determines the level adjustment amount of the reception level and the transmission level according to the attenuation amount, and a level adjustment unit that adjusts the reception level and the transmission level by the control unit. An automatic volume level adjusting device for a button telephone, characterized by automatically adjusting a voice signal level by receiving a PB signal.