JPH09163420A - Key telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set appropriate output volume in accordance with the various conditions such as the installation place of a speaker or the state during conference even without providing any special volume control means. SOLUTION: In this system provided with a private broadcasting function, an extension telephone set 2 having volume control means 21 and 22 for controlling the receiver volume is connected to a host unit 1 connected to a line, a speaker 4 is connected to the host unit 1, and the voice inputted from the microphone of hand set 3 of the extension telephone set 2 is outputted through the host unit 1 and the speaker 4. At such a time, the level of input voice of the hand set 3 outputted from the speaker 4 is controlled by operating the volume control means 21 and 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone device, and more particularly to a key telephone device having a private broadcasting function.

[0002]

2. Description of the Related Art Conventionally, in a key telephone apparatus having a private broadcasting function, a terminal key telephone (extension telephone) and a private broadcasting speaker are installed at desired positions, and a microphone built in a handset of the key telephone is used. The voice uttered by the operator is converted into an electric signal and sent to the main device (button telephone device). The main device performs a predetermined process on this electric signal, and the processed voice signal is output as a voice from the speaker to make various communications.

By the way, there are various places where the button telephones of this type of button telephone apparatus are installed, and in a factory where a large number of machine processing machines are installed, in a quiet office, etc., the output volume from the speaker is appropriate. The values are different. For example, in an environment where ambient noise is large, such as in a machine factory, the contents cannot be accurately heard unless the output volume from the speaker is large. On the other hand, in an environment such as a quiet office, if the output volume from the speaker is too loud, it will be annoying and hinder work. Further, when the operator performing broadcasting is in the vicinity of the speaker, it is necessary to reduce the output volume even if the ambient sound is loud.

A technique for monitoring the ambient noise and appropriately adjusting the amplification amount and the attenuation amount of the variable amplifier or the variable attenuator according to the monitoring result in order to obtain the optimum output volume corresponding to the magnitude of the ambient noise. Is, for example, JP-A-53-89345.
Are known as disclosed in the publication.

The automatic volume control technique automatically increases the output volume when the ambient noise is large and automatically reduces the output volume in a quiet environment. When there is a listener, even if the ambient noise is large, it is impossible to deal with it even though the output volume must be reduced.

As described above, since the output volume of the conventional broadcasting system of the key telephone system is fixed or is automatically varied according to the magnitude of the ambient noise, when there is a listener near the speaker or in the conference. If it is in progress, we cannot take appropriate action. That is, the above-mentioned problems may occur depending on the location and conditions of the speaker installation.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a button telephone capable of setting an appropriate output volume according to various conditions such as a place where a speaker is installed or during a meeting without providing a special volume adjusting means. To provide a device.

[0008]

In order to solve the above-mentioned problems, in the button telephone apparatus of the present invention, an extension telephone having a volume adjusting means for adjusting a receiving volume is connected to a main apparatus connected to a telephone line. At the same time, a speaker is connected to the main device, and in a button telephone device having a private broadcasting function for outputting the audio input from the microphone of the handset of the extension telephone via the main device and the speaker, from the speaker. The level adjustment of the output voice input from the handset is performed by operating the volume adjusting means.

The volume adjusting means comprises a volume increasing button for increasing the volume and a volume decreasing button for decreasing the volume. The main unit receives the control signal from the volume adjusting means and the input voice signal from the handset. , And has a function of digitizing these signals and adjusting the level of the input audio signal level based on the control signal.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a key telephone device according to the present invention, which includes a key telephone device 1 as a main device, a digital extension telephone 2 as a terminal, a handset 3, and a speaker 4. Is configured.

The voice input from the microphone of the handset 3 is transmitted through the digital extension telephone 2 to the key telephone device 1.
And the volume control signal designated by the volume increase button 21 or the volume decrease button 22 is output to the button telephone device 1. The volume increase button 21 and the volume decrease button 22 are provided on the digital extension telephone 2 as a conventionally used terminal, and are buttons for adjusting the reception volume. In the present embodiment, these buttons 21 and 22 are also used as buttons for adjusting the output volume output from the speaker 4. A digital extension interface circuit 11 of the key telephone device 1 performs predetermined interface processing on the output voice signal and the output volume control signal from the digital extension telephone 2, and the CPU 12 and the digital integrator 13 as a volume control unit perform the interface processing. Sent out. The CPU 12 receives the volume adjustment control signal, generates a voice control signal for adjusting the volume level of the digital voice signal, and sends it to the digital integrator 13. The digital integrator 13 integrates the voice control signal from the CPU 12 and the voice signal from the digital extension interface circuit 11,
Adjust the volume level to the specified level and D
It is sent to the / A converter 14. D / A converter 14
The audio signal converted into an analog signal by the speaker 4
The sound is output from the speaker 4 via the driving amplifier 15 of FIG.

In the present embodiment, the volume increase button 21 and the volume decrease button 22 are also used as means for adjusting the reception volume and the transmission volume, and these buttons are operated to optimize the output depending on the speaker installation location. The volume can be adjusted.
For example, when there is a listener in the vicinity of the speaker, the volume down button 22 is operated to reduce the output volume of the local broadcast, and also during conversation, the output volume is similarly reduced to adversely affect the progress of the conference. I am trying not to give.

[0013]

As described above, according to the key telephone device of the present invention, an appropriate output volume can be provided according to various conditions such as the place where the speaker is installed, the conference, etc. without providing any special volume adjusting means. Since it can be set, it is possible to perform accurate and uncomfortable public broadcasting.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a key telephone device according to the present invention.

[Explanation of symbols]

 1 Button telephone device 2 Digital extension telephone 3 Handset 4 Speaker 11 Digital extension interface circuit 12 CPU 13 Digital accumulator 14 D / A converter 21 Volume increase button 22 Volume decrease button

Claims (3)

[Claims] 1. An extension telephone having volume adjusting means for adjusting a receiving volume is connected to a main unit connected to a telephone line, and a speaker is connected to the main unit.
In a button telephone device having a private broadcasting function for outputting an audio input from a microphone of a handset of the extension telephone via the main device and a speaker, the volume adjusting means adjusts the level of the input audio output from the speaker. A key telephone device characterized by being operated by. 2. The button telephone apparatus according to claim 1, wherein the volume adjusting means comprises a volume increasing button for increasing the volume and a volume decreasing button for decreasing the volume. 3. The main device receives a control signal from the volume adjusting means and an input voice signal from the handset, digitizes these signals, and adjusts the level of the input voice signal based on the control signal. The key telephone device according to claim 1.