JPH02250455A - Speaker sound volume variable system for telephone set - Google Patents

Abstract

PURPOSE:To always obtain proper speaker sound volume without troublesome operating of a sound volume adjustment device by adjusting speaker sound volume automatically proportional to surrounding noise. CONSTITUTION:While a key telephone set hooks on, when surrounding noise is increased, the detected sound volume detected by a microphone is increased and an output of a surrounding noise detection circuit, that is, a voltage value of a holding circuit 10 is increased. A sound volume variable circuit 11 is set by the voltage value of the holding circuit 10 and when the user hooks off a key telephone set, a signal is sent to a detection input switch 6 and a detection output switch 7 from a hook switch circuit 8 and the detection input switch 6 and the detection output switch 7 are opened. In this case, the holding circuit 10 holds a noise volume of the surrounding noise just before hook-off and a sound volume adjustment signal is sent to an amplifier 12 based on the surrounding noise volume. Based on the signal, the amplifier 12 adjusts the output to regulate the sound volume of the speaker 13. Thus, the operation of the sound volume adjustment device is not required and the sound with proper volume is always obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to telephones, and more particularly to a speaker volume variable system for telephones that adjusts the speaker volume in proportion to the amount of ambient noise.

[Conventional technology]

With conventional telephone speaker volume control systems, when the surrounding noise such as noise is large and it is difficult to hear the voice from the speaker, the volume can be adjusted by manually operating the volume adjuster (VOLUME) provided on the telephone body. I adjusted it by making it bigger.

[Problems to be Solved by the Invention] Therefore, in the conventional telephone speaker volume variable system, the volume adjuster must be manually operated each time depending on the surrounding noise, which is extremely troublesome. Additionally, if your phone is installed in a location where there are large fluctuations in ambient noise, if you adjust the volume when the ambient noise is high, the volume will become too loud when the ambient noise is low, and you will have to adjust the volume again. Adjusting the volume was a pain.

SUMMARY OF THE INVENTION An object of the present invention is to provide a speaker volume variable system for a telephone that eliminates such inconvenience and allows a user to always obtain a suitable volume without having to operate a cumbersome volume adjuster.

[Means to solve the problem]

The present invention is a speaker volume variable system for a telephone that has a transmitter that transmits voice and a voice generator that amplifies the voice signal and outputs the voice, and the speaker volume of the telephone is variable when the telephone is on-hook. an ambient noise detection signal transmitter that detects and transmits an amount of ambient noise; and a speaker volume of the audio generator that receives the amount of ambient noise from the ambient noise detection signal transmitter and adjusts the volume of the speaker of the audio generator in proportion to the amount of ambient noise when the telephone is off-hook. and a volume adjustment section for adjusting the volume.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

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

This telephone speaker volume variable method consists of a transmitter 1, an ambient noise detection signal transmitter 2, a volume adjuster 3, and a voice generator 4, and adjusts the speaker volume of the button telephone in proportion to the amount of ambient noise. It can be made variable.

The transmitter 1 includes a microphone 5, which detects ambient noise such as noise around the telephone, converts it into an electrical signal, and sends it to the ambient noise detection signal sending section 2.

The microphone 5 is, for example, a piezoelectric microphone, and is normally used as a microphone for transmitting speech, detects ambient noise when on-hook, and sends it to the ambient noise detection signal sending section 2.

The ambient noise detection signal sending unit 2 includes a detection input switch 6, a detection output switch 7, a hook switch circuit 8, and an ambient noise detection circuit 9. A signal for adjusting the adjustment section 3 is sent out.

The detection output switch 6 and the detection output switch 7 are switches made of semiconductor switching elements and the like, and are "opened and closed" by a signal from the hook switch circuit 8. In the on-hook state, an on-hook signal is sent from the hook switch circuit 8, and at the time of this signal, the detection input switch 6 and the detection output switch 7 are in the "closed" state.In addition, in the off-hook state, the off-hook signal is sent from the hook switch circuit 8. is sent out, and this signal causes the detection input switch 6 and the detection output switch 7 to be in the "open" state.

The ambient noise detection circuit 9 sends a detection signal based on ambient noise taken in from the microphone 5 of the transmitter 1 to the volume adjustment section 3 as an amount of ambient noise.

In addition, the detection signal due to ambient noise is detected by the detection input switch 6.
and is sent to the volume adjustment section 3 while the detection output switch 7 is "closed".

The volume adjustment section 3 includes a holding circuit 10 and a volume variable circuit 11, and adjusts the volume of the speaker.

The holding circuit 10 is composed of a capacitor and the like, and holds the ambient noise detection signal from the ambient noise detection signal sending section 2. Then, based on this held detection signal, the speaker volume of the audio generator 4 is varied and set. The ambient noise detection signal is held while on-hook, and the amount of ambient noise at this time determines the speaker volume of the audio generator 4.

The volume variable circuit 11 instructs the sound generation section 4 to change the speaker volume based on the ambient noise detection signal held in the holding circuit 10.

The audio generator 4 includes an amplifier 12 and a speaker 13, and the speaker 13 converts the audio signal amplified by the amplifier 12 into audio.

The amplifier 12 sets the volume in response to instructions from the volume adjustment section 3, and when listening from the speaker 13 in an on-hook state, amplifies the other party's voice and outputs the sound from the speaker 1 at the set volume.
Output from 3.

Next, the operation of this embodiment will be explained. When the button telephone is on-hook, the detection input switch 6 and detection output switch 7 are in the closed state. At this time, ambient noise such as noise is detected by the microphone 5 and converted into a detection signal. The detection signal is sent to the detection input switch 6.
The signal is taken into the ambient noise detection circuit 9 via the ambient noise detection circuit 9 and converted into an amount of ambient noise. Then, the holding circuit 10 is charged via the surrounding noise detection circuit 9, and the amount of surrounding noise is held. While the button telephone is on-hook, if the ambient noise increases, the amount detected by the microphone also increases, and the output of the ambient noise detection circuit, that is, the voltage value of the holding circuit 10 changes and increases.

Then, depending on the voltage value of this holding circuit 10, the volume variable circuit 1
1 is set. When the user takes the key telephone off-hook, a signal is sent from the hook switch circuit 8 to the detection input switch 6 and the detection output switch 7, and the detection input switch 6 and the detection output switch 7 are turned "open". At this time, the holding circuit 10 holds the amount of ambient noise immediately before going off-hook, and based on this amount of ambient noise, the amplifier 12
An audio adjustment signal is sent to the Based on this signal, the amplifier 12 adjusts its output to adjust the volume of the audio output from the speaker 13.

As described above, this button telephone detects ambient noise when on-hook, and sets the volume to correspond to the amount of ambient noise detected immediately before when off-hook. Furthermore, as the ambient noise increases, the speaker volume is also set higher, so the speaker volume is always proportional to the amount of ambient noise.

In this button phone, the speaker volume generated from the button phone's speaker is adjusted by the ambient noise just before the button phone is used, but the ambient noise does not change in a short period of time. It is thought that the ambient noise during use is almost the same, so there is no problem in using it.

〔Effect of the invention〕

As explained above, even if the ambient noise around the phone is large, the speaker volume is automatically adjusted in proportion to the amount of ambient noise, so the speaker volume is always adjusted to the appropriate level without having to operate a cumbersome volume adjuster. This has the effect of increasing the volume.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing one embodiment of the present invention. ■...Transmitter 2...Ambient noise detection signal sending unit 3...Volume adjustment unit Sound generation unit Microphone ambient noise detection circuit Volume variable circuit

Claims (1)

[Claims] (1) A variable speaker volume system for a telephone that has a transmitter that transmits voice and a voice generator that amplifies the audio signal and outputs the voice, and when the telephone is on-hook, the speaker volume of the telephone is adjusted from the transmitter to the surroundings. an ambient noise detection signal sending section that detects and sends out the amount of noise; and capturing the amount of ambient noise from the ambient noise detection signal sending section, and adjusting the speaker volume of the audio generating section in proportion to the amount of ambient noise when the telephone is off-hook. 1. A speaker volume variable method for a telephone, comprising: a volume adjustment section for adjusting the volume.