JPH10290282A - Hands-free control circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To talk with auditorily relatively constant sound pressure by detecting environmental noise in a circumference previously, adding a constant level value of the environmental noise, and outputting it through a speaker. SOLUTION: When an incoming signal from a line is detected as a ringer signal, the circumferential environment noise in this state is inputted from a microphone 16. The level of the environmental noise is detected by a noise detection part 14 to measure the current noise level in the circumference of facsimile equipment. How different from the environmental noise the reinforced voice outputted from the speaker 15 is set as level difference data first. Then a control part 13 compares the environmental noise with the level difference data to determine the output level of the reinforced voice from the speaker. The calculated value is sent to a speaker output level adjustment part 12 and the gain of the output level of the speaker 15 is adjusted, thereby having a hands-free talk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hands-free control circuit in a communication device.

[0002]

2. Description of the Related Art In a digital telephone having a receiver circuit having an amplifier and a microphone circuit used for hands-free communication, the volume of the received sound is controlled by the loudness of the ambient sound detected by the microphone circuit of the handset during the call. A receiving volume control circuit for a digital telephone characterized by the following is disclosed in Japanese Patent Application Laid-Open No. Sho 62-133845.

[0003]

SUMMARY OF THE INVENTION In the prior art,
When making a hands-free call, unlike a call using a normal handset, since it is an acoustic transmission, it is susceptible to environmental noise in the sense of surroundings. Since the output level at the start of the call is not stable, the sound may be too large or too small. This is because environmental noise is detected during a call.

In addition, since the amplifier operates when the environmental noise is equal to or more than a predetermined value, the loudspeaker is amplified only when the hands-free speech is low and the ambient environmental noise is high. On the contrary, in a quiet environment where there is almost no surrounding environmental noise and the call volume is large, the noise remains as it is.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hands-free control circuit for automatically adjusting the output level loudspeaked from a speaker when performing hands-free communication by comparing it with the noise level of the surrounding environment. is there.

[0006]

SUMMARY OF THE INVENTION According to the present invention, when performing a hands-free call at the time of an incoming call, after detecting a ringer signal from a line, the surrounding environment noise of the communication device in that state is detected and measured, and a speaker is used. If the output level of the loudspeaker is changed by the set level value rather than the ambient environmental noise to perform a loudspeaker and perform a hands-free call at the time of calling, after pressing the hands-free button for calling,
The surrounding environment noise of the communication device in that state is detected and measured, and the speaker output level is varied by a set level value more than the surrounding environment noise, and the sound is amplified. It is characterized by shifting to a call operation.

According to the present invention, in the case of an incoming call state, after detecting the ringer, the surrounding environmental noise is measured before the hands-free call state becomes possible, and the loudspeaker is automatically set to the environmental noise + set level. Adjust the output level. Also,
Similarly, in the case of an outgoing call, the surrounding environment noise is measured before the line is closed, and the loudspeaker output level is automatically adjusted so as to be equal to the environment noise + set level.

[0008]

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

FIG. 1 is a block diagram showing one embodiment of a hands-free control circuit of the present invention in a facsimile apparatus. The hands-free control circuit of FIG. 1 includes a hands-free control unit 11, a microphone 16, a ringer detection unit 10 for detecting a ringer signal from a line at the time of an incoming call in a hands-free call, and a dial button being pressed during a call. Before the line is closed, a ringer signal is detected during an incoming call, and after detecting the surrounding environment noise level from the microphone 16 before the hands-free communication state is enabled, the noise detection unit 14 and the level of the surrounding environment are detected. Set the difference data,
A control unit 13 for controlling each unit; and a speaker level adjusting unit 12 for varying a speaker output level from the detected and measured ambient noise level and the level difference data.
And a speaker 15 for vocalizing the voice.

Referring to FIG. 1, in this embodiment, when a hands-free call is made during an incoming call, a ringer signal, which is an incoming signal from a line, is monitored and detected by a ringer detecting unit 10. If a ringer signal is detected, the ambient environment noise level in this state is input from the microphone 16. The input ambient environment noise level is detected by the noise detection unit 14 and the current noise level around the facsimile apparatus is measured. First, according to the user setting, the level difference data is set to what level difference the loudspeaker voice from the speaker 15 wants to output with respect to the ambient environmental noise. The controller 13 compares the ambient noise with the level difference data to determine the output level of the loudspeaker from the speaker. The calculated value is sent to the speaker output level adjustment unit 12, the gain of the output level from the speaker 15 is adjusted, and hands-free communication is performed. As a result, disconnection of the head of the conversation and excessive volume from the start of the call can be prevented, and a stable hands-free call can be always performed.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS. FIG. 2 is a flowchart of a hands-free call at the time of an incoming call to the facsimile machine. When the facsimile apparatus is in the standby state, it detects the presence or absence of a ringer signal from the line. When the signal is recognized as a ringer signal, the ambient noise detection circuit is activated to measure the level of the ambient environmental noise from the microphone. Next, the level difference data set for the ambient environment noise level is added, and the data is set in the speaker output level adjustment unit. Make free calls.

FIG. 3 is a flowchart of a hands-free call at the time of outgoing call to the facsimile machine. When the facsimile apparatus is in the standby state, it monitors whether a key is pressed for calling. If the key press is recognized, the ambient noise detection circuit is activated to measure the level of the ambient environmental noise from the microphone. Next, the level difference data set as the ambient environment noise level is added, and the data is set in the speaker output level adjustment unit, and the line is closed. Then, the voice adjusted to the setting data is loudspeaked from the speaker to perform a hands-free call.

As described above, according to the present embodiment, when performing a hands-free call, when a ringer signal is detected from a line, and when a key for calling is pressed at the time of calling, the surrounding environment noise is reduced. Measure and detect, and set in advance how much level the loud voice should hear with respect to the ambient noise, and set the loud voice level from the speaker to the level obtained by adding the level difference data to the measured ambient noise. By doing so, the level is automatically adjusted, and the hands-free call at the beginning of the talk can be clearly heard.

In this embodiment, the hands-free control circuit of the facsimile apparatus has been described. However, the present invention is not limited to this, and it goes without saying that the present invention can be applied to a general telephone apparatus such as a key telephone.

[0015]

As described above, according to the present invention, it is possible to automatically adjust the loudspeaker volume of a hands-free call in accordance with the surrounding environmental noise. That is, the present invention detects the surrounding environmental noise in advance, adds a certain level value to the environmental noise, and loudspeakers from the speaker, so that the noise is relatively constant regardless of the level of the environmental noise. You will be able to talk at the sound pressure of. Also, this can prevent the beginning of the call and the excessive volume from the beginning of the call,
A stable hands-free call is always possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a hands-free control circuit of the present invention.

FIG. 2 is a flowchart of a hands-free call at the time of an incoming call.

FIG. 3 is a flowchart of a hands-free call at the time of outgoing call.

[Explanation of symbols]

 Reference Signs List 10 Ringer detection unit 11 Hands-free control unit 12 Speaker output level adjustment unit 13 Control unit 14 Noise detection unit 15 Speaker 16 Microphone

Claims (4)

[Claims] When a hands-free call is made at the time of an incoming call, after detecting a ringer signal from the line, before the hands-free call state becomes possible, the surrounding environment noise of the call device is detected and measured, and the noise from the speaker is detected. A hands-free control circuit characterized in that the output level is made variable by a set level value rather than the ambient environmental noise to perform loudspeaking. 2. When performing a hands-free call at the time of calling, after pressing a hands-free button for calling, and before closing a line, the surrounding environment noise of the calling device is detected and measured, and a speaker is detected. A hands-free control circuit characterized in that, after making a setting for making the output level more variable by the set level value than the ambient environmental noise to increase the voice, the line is closed and the operation shifts to a calling operation. 3. When performing a hands-free call at the time of an incoming call, after detecting a ringer signal from a line, the surrounding environment noise of the communication device is detected and measured, and the output level from the speaker is set more than the surrounding environment noise. When a hands-free call is made at the time of outgoing call by pressing the hands-free button to make a call, the surrounding environment noise of the intercom equipment is detected and measured, and the A hands-free control circuit characterized in that, after setting the output level to be more variable than the ambient environmental noise by a set level value to make a loudspeaker, the line is closed and the operation shifts to a calling operation. 4. The hands-free control circuit according to claim 1, wherein said communication device is a facsimile device or a key telephone.