JPH05284079A - Telephone set - Google Patents

Abstract

PURPOSE:To provide a telephone set which selectively amplifies audio signals. CONSTITUTION:This telephone set is provided with audio frequency dividing parts 22a, 22b... to divide the frequency component of an audio band into prescribed audio frequency bands, plural audio amplifying parts 23a, 23b... connected to these audio frequency dividing parts 22a, 22b... so as to amplify the audio signals for each prescribed audio frequency, and gain control part 29 connected to these plural audio amplifying parts 23a, 23b... and controlling the grains of the plural amplifying parts 23a, 23b... compared with a set value set by a surrounding sound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone, and in particular,
The present invention relates to a telephone that selectively amplifies a voice signal.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a voice control device 10 such as a mobile phone has an amplifier 12 for amplifying a voice signal sent from a microphone 11.
The radio signal is amplified by the radio unit 13, modulated by the radio unit 13, and radiated from the antenna 14 to another telephone (not shown) as a radio wave to carry out a call.

In such a call, the voice signal is always detected by the detection unit 15 and the gain of the amplification unit 12 is controlled from the integrated value integrated by the integration unit 16 so that the voice has an optimum value.

However, in this amplification control, all voice signals are collectively amplified with the same gain, so that there is a problem that a noise signal is amplified with the same gain together with the voice signal and a good quality call cannot be performed.

Therefore, the present invention provides a telephone which selectively amplifies only a voice signal necessary for a call and enables a good quality call.

[0006]

According to the present invention, a voice frequency division unit for dividing a frequency component of a voice band into a predetermined voice frequency band, and an audio signal amplified for each predetermined voice frequency band connected to the voice frequency division unit. A plurality of audio amplifiers, and a gain controller connected to the plurality of audio amplifiers and controlling a gain of the plurality of amplifiers compared with a set value set from ambient sound. It provides a telephone.

[0007]

The frequency component of the voice band is divided into a predetermined voice frequency band, the divided voice signal is compared with the set value monitored from the ambient sound, and the voice signal is gain-controlled for each divided frequency band.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the telephone of the present invention will be described below with reference to FIG.

The microphone 21 of the voice control device 20 continues to have filters 22a, 22b ... Which divide the frequency component of the voice band into, for example, every 100 Hz. Each of the filters 22a, 22b ... Has an amplifier 23a, 2a.
3b ... Are connected and amplification is performed with a gain suitable for each audio frequency band. A radio unit 24 is connected to the amplifying units 23a, 23b ..., The audio signals amplified by the amplifying units 23a, 23b ... Are modulated into radio waves and directed to another telephone (not shown) via an antenna 25. Is emitted.

An ambient sound monitor 26 is connected to the microphone 21 to monitor ambient sound in the vicinity of the microphone 21. An amplifier gain initial setting unit 27 and a reference level setting unit 28 are connected to the ambient sound monitor 26.
The amplification unit gain initial setting unit 27 uses the ambient sound to amplify the amplification unit 23a,
23b ... The initial gain is set, and the reference level setting unit 28
Is set to a reference level of an audio signal to reduce noise amplification.

The amplification unit gain initial setting unit 27 and the reference level setting unit 28 are connected to a gain control unit 29, and the initial gain value of the amplification unit gain initial setting unit 27 is amplified via the gain control unit 29. To each amplifier 23a, 23
The initial gain setting of b ... Is performed and the reference level of the reference level setting unit 28 is sent to the gain control unit 29 to set the reference level of the gain control unit 29.

On the other hand, detectors 30a, 30b ... Are respectively connected to the output sides of the amplifiers 23a, 23b ... And the audio signals amplified by the amplifiers 23a, 23b. The detecting section 30a, 30b ... Has an integrating section 31.
a, 31b ... Are connected and the detected voice signal is integrated.

The analog / digital converters 32a, 32b ... Are connected to the integrators 31a, 31b ..., and analog voice signals are converted into digital signals. Memory units 33a, 33b ... Are connected to the analog / digital converters 32a, 32b.

A gain control unit 29 is connected to the memory units 33a, 33b, ..., Amplifying the amplifying units 23a, 23b ... With reference to the gain initial setting value and the reference level setting value set by the ambient sound monitor 26 and the like. The gain is calculated, and each amplification unit 23a, 23b ... Is controlled by this amplification gain.

Next, the operation of the voice control device 20 of the portable telephone configured as described above will be described.

First, ambient sound is input from the microphone 21 and sent to the ambient monitor 26. The ambient monitor 26 monitors the ambient sound in the vicinity of the microphone 21, and the monitor signal is sent to the amplification unit gain initial setting unit 27 and the reference level setting unit 28. The amplification unit gain initial setting unit 27 is set to reduce the control gain of the amplification units 23a, 23b ... When the ambient sound is large, and increase the control gain of the amplification units 23a, 23b ... When the ambient sound is small. The reference level setting unit 28 sets the reference level of the audio signal from the monitor signal.

The control gain value set by the amplification unit gain initial setting unit 27 is transmitted via the gain control unit 29 to the amplification units 23a and 23b.
, The gain is initially set, the reference level value set by the reference level setting unit 28 is sent to the gain control unit 29, and the reference value of the gain control unit 29 is set to prevent noise signals from entering. It is also used as a standard for amplification gain.

When the voice of the caller is input to the microphone 21 of the mobile phone, the microphone 21 converts the voice into a voice signal. This audio signal is filtered by the filter 22a,
22b ... and are divided into, for example, every 100 Hz.
The divided audio signals are amplified by the amplifiers 23a, 23b, ... For each divided frequency, and are transmitted from the antenna 25 to another telephone or the like via the radio unit 29 to make a call. On the other hand, the audio signals amplified by the amplifiers 23a, 23b ... Are detected by the detectors 30a, 30b.
a, 31b ..., Analog / digital converters 32a, 3
2b ..., And is sent to the gain control section 29 via the memory sections 33a, 33b.

The gain control unit 29 makes a determination with respect to each audio signal as a reference level. That is, the audio signal from the amplifier 23a is compared with the reference level S, and if the level difference is positive, the control gain of the amplifier 23a is increased, and if the level difference is negative, the gain of the amplifier 23a is decreased. .. In the same manner, the control gains of the amplifiers 23b, 23c ... Are independently controlled along the audio signal.

The voice signal is amplified by the amplifiers 23a, 23b, 23c ... By the control gain thus controlled and sent to another telephone or the like, so that noise is less mixed in the voice signal and a good quality call is made. You can talk with sound.

[0021]

According to the present invention, a voice frequency division unit for dividing a frequency component of a voice band into a predetermined voice frequency band, and a plurality of voices connected to the voice frequency division unit for amplifying a voice signal for each predetermined voice frequency band. Since the amplification section and the gain control section that is connected to the plurality of voice amplification sections and is compared with the set value set from the ambient sound and controls the gain of the plurality of amplification sections are provided, the segmented call voice is given for each predetermined band. It is possible to make high-quality calls with little noise by being selectively amplified independently.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a voice control device of a telephone of the present invention.

FIG. 2 is a block diagram showing an outline of a conventional voice control device for a telephone.

[Explanation of symbols]

 10 voice control device 11 microphone 12 amplification unit 13 radio unit 14 antenna 15 detection unit 16 integration unit 20 voice control device 21 microphone 22a filter 23a amplification unit 24 radio unit 25 antenna 26 ambient sound monitor 27 amplification unit gain initial setting unit 28 reference level Setting unit 29 Gain control unit 30a Detection unit 31a Integration unit 32a Analog / digital conversion unit 33a Memory unit

Claims (1)

[Claims] 1. A voice frequency division unit for dividing a frequency component of a voice band into a predetermined voice frequency band, and a plurality of voice amplification units connected to the voice frequency division unit for amplifying a voice signal for each predetermined voice frequency band, A telephone comprising: a gain control unit connected to the plurality of audio amplification units and compared with a set value set from ambient sound to control a gain of the plurality of amplification units.