JPS62133844A - Telephone set for varying call tone volume automatically - Google Patents

Abstract

PURPOSE:To attain a call with a tone volume corresponding to the surrounding environment by using a voltage obtained through the detection of surrounding noise intensity to vary the call tone volume automatically. CONSTITUTION:The surrounding noise is converted into an electric signal by a microphone 1 and the converted electric signal is amplified by an amplifier 2, detected by a detector 3, the detected output enters a smoothing deice 4, from which a DC output is obtained. In receiving a call signal 6, a voltage holding device 5 holds the output voltage of the smoothing deice 4 at that time and the state continues until the signal 6 is lost. Then the signal 6 operates a call tone oscillator 7, the call oscillation output is amplified by a voltage- controlled gain variable amplifier 8 to drive a speaker 9, from which a call tone is generated. The gain of the amplifier 8 is varied by a control input voltage from the holding deice 5. Thus, the call having a tone volume corresponding to the surrounding environment is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a telephone, and particularly to an automatically variable ringer volume telephone that can automatically vary the volume of a ringer.

[Conventional technology]

Telephones usually have a function that allows the volume of the ringer to be varied, but conventionally, once this variable function has been set, it remains fixed unless it is reset.

[Problem that the invention seeks to solve]

With the conventional telephones mentioned above, the volume of the ringer remains constant regardless of the intensity of the surrounding noise, so there are many cases where the surroundings are noisy at work, such as in an office. However, there was a problem that the volume of the discharge sound was low (so it was difficult to open the phone), and it was also difficult to tell which phone was ringing.Conversely, when it was quiet like at night, The disadvantage is that the loud ringing tone is unpleasant for the called party.

[Means for solving problems]

The automatically variable ringer volume telephone set of the present invention includes a detection means for detecting ambient noise intensity, and a ringer volume variable means controlled by the voltage obtained by the detection means,
This allows the volume of the ringer to be automatically varied.

[For production]

In the present invention, when the surroundings are noisy, the volume of the ringer of the telephone is increased, and when the surroundings are quiet, the volume is decreased.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram showing an embodiment of an automatically variable ringer volume telephone according to the present invention.

In the figure, 1 is a microphone that converts ambient noise into an electrical signal, 2 is an amplifier that amplifies the electrical signal converted by this microphone 1, 3 is a detector that detects the output of this amplifier 2, and 4 is this detector. The smoother receives the output of the filter 3 as an input and obtains a DC output, and these components constitute a detection means for detecting the intensity of ambient noise. A dedicated microphone 1 may be provided, or a hands-free microphone may be used in common if it is a telephone receiver or a telephone capable of hands-free operation.

5 is a voltage holder to which the ringing signal 6 is supplied, which also receives the output of the smoother 4 and has an output voltage t- of the smoother 4; T is actuated by the arrival of the ringing signal 6 and generates a ringing tone; 8 is a voltage-controlled variable gain amplifier whose gain is controlled by the output of the voltage holder 5, and 9 is driven by the output of the variable gain amplifier 8. These speakers constitute ringer volume variable means controlled by the voltage obtained by the ambient noise intensity detection means.

Next, the operation of the embodiment shown in this figure will be explained.

First, ambient noise is converted into an electrical signal by a microphone 1, and the converted fc electrical signal is amplified by an amplifier 2, then detected by a detector 3, and the detected output enters a smoother 4 to obtain a DC output.

This smoother 4 is provided with a time constant of several seconds determined by a capacitor and a resistor, for example, so that even if there is a call for mold cutting when the surrounding noise stops momentarily or when a momentary loud noise occurs, Make sure the volume is not inappropriate.

Next, when the calling signal 6 is received, the voltage holder 5 holds the output voltage of the smoother 4 at that time, and continues in this state until the calling signal 6 disappears. This is to prevent the microphone 1 from erroneously determining that the ambient noise intensity has increased due to the microphone 1 detecting its own ringing tone.

The ringing signal 6 also activates the ringing tone oscillator 7, and the ringing tone oscillation output is transmitted to the voltage-controlled variable gain amplifier 8.
The signal is amplified and drives the speaker 9 to generate a ringing tone.

Here, this voltage-controlled variable gain amplifier 8 is an amplifier whose gain changes depending on the control input voltage from the voltage holder 5. When the control input voltage is high, the gain becomes large, and when the control input voltage is low, the gain becomes large. Sometimes the gain is also small.

Therefore, when the surroundings are noisy, the output voltage of the voltage holder 5 increases, so the volume of the ringing tone increases, and when the surroundings are quiet, the output voltage of the voltage holder 5 decreases, so the volume of the ringing tone decreases.

〔Effect of the invention〕

As explained above, according to the present invention, the surroundings can be easily detected without using any complicated means, with a simple configuration including a means for detecting ambient noise intensity and a means for changing the volume of the ringer controlled by the detecting means. The practical effect is extremely large because the volume of the telephone ringer can be increased when the surroundings are noisy, and the volume of the telephone ringer can be decreased when the surroundings are quiet.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. 1...Microphone, 2...Amplifier, 3...
・Detector, 4...Smoother, 5...Voltage holder,
7...φ ringing tone oscillator, 8...voltage controlled variable gain amplifier, 9...speaker.

Claims (1)

[Claims] The device is equipped with a detection means for detecting ambient noise intensity and a ringer volume variable means controlled by the voltage obtained by the detection means, so that the volume of the ringer can be automatically varied. A telephone with automatic variable ring volume.