JPH10290497A5

JPH10290497A5 -

Info

Publication number: JPH10290497A5
Application number: JP1997099144A
Authority: JP
Filing date: 1997-04-16
Publication date: 2004-10-21
Anticipated expiration: 2017-04-16

Description

【発明の名称】音声信号の処理回路および処理方法[Title of Invention] Audio signal processing circuit and processing method

Claims

an amplitude modification circuit for modifying the amplitude of a consonant component of an input speech signal;
a start point detection circuit for detecting the start point of a voiced sound in the speech signal;
an end point detection circuit for detecting an end point of the voiced sound in the speech signal;
a control circuit that controls the gain of the amplitude change circuit in accordance with outputs of the start point detection circuit and the end point detection circuit;
When the start point detection circuit detects the start point, the control circuit supplies a control signal to the amplitude change circuit to increase the gain, and
an audio signal processing circuit that supplies a control signal to the amplitude changing circuit to return the gain when the end point detection circuit detects the end point;

2. The audio signal processing circuit according to claim 1,
The start point detection circuit is a speech signal processing circuit that detects when the signal level of the voiced sound exceeds a predetermined threshold value and uses this as a detection signal for the start point.

2. The audio signal processing circuit according to claim 1,
The end point detection circuit is a speech signal processing circuit that detects when the signal level of the voiced sound falls below a predetermined threshold value and uses this as a detection signal for the end point.

2. The audio signal processing circuit according to claim 1,
The audio signal processing circuit is configured such that the amplitude change circuit is a variable gain amplifier.

5. The audio signal processing circuit according to claim 1,
A speech signal processing circuit that is configured to increase the gain of the amplitude change circuit during a rise period and a fall period, where a period of several milliseconds to 10-odd milliseconds from the start point of the voiced sound is defined as a rise period and a period of 10-odd milliseconds to tens of milliseconds from the end point of the voiced sound is defined as a fall period.

an amplitude changing step of changing the amplitude of a consonant component of the input speech signal;
a start point detection step of detecting a start point of a voiced sound in the speech signal;
an end point detection step of detecting an end point of the voiced sound in the speech signal;
a control step of controlling a gain of the amplitude changing step in accordance with outputs of the start point detecting step and the end point detecting step,
The control step supplies a control signal to the amplitude change step so as to increase the gain when the start point detection step detects the start point, and
When the end point detection step detects the end point, a control signal is supplied to the amplitude change step to return the gain.