US 7,117,150 B2 · Voice detecting method and apparatus using a long-time average of the time variation of speech features, and medium thereof

Abstract

A first filter (2061 in FIG. 1) calculates a long-time average of first change quantities based on a difference between a line spectral frequency of an input voice signal and a long-time average thereof. A second filter (2062 in FIG. 1) calculates a long-time average of second change quantities based on a difference between a whole band energy of the input voice signal and a long-time average thereof. A third filter (2063 in FIG. 1) calculates a long-time average of third change quantities based on a difference between a low band energy of the input voice signal and a long-time average thereof. A fourth filter (2064 in FIG. 1) calculates a long-time average of fourth change quantities based on a difference between a zero cross number of the input voice signal and a long-time average thereof. A voice/non-voice determining circuit (1040 in FIG. 1) discriminates a voice section from a non-voice section in the voice signal using the long-time average of the above-described first change quantities, the long-time average of the above-described second change quantities, the long-time average of the above-described third change quantities, and the long-time average of the above-described fourth change quantities.

Claims21

Dependent claims

A voice detecting method discriminating a voice section from a non-voice section for every fixed time length for a voice signal comprising the steps of:

(a) calculating a feature quantity from said voice signal input;
(b) calculating a change quantity from said feature quantity, said change quantity corresponds to a variation in time of said feature quantity;
(c) discriminating the voice section from the non-voice section, using a long-time average of said change quantity, said long-time average of said change quantity is obtained by inputting said change quantity to filters;
and
(d) repeating steps (a)–(c) for every fixed time length in the voice signal, wherein at least one of a line spectral frequency, a whole band energy, a low band energy and a zero cross number is used for said feature quantity, and wherein at least one of a line spectral frequency that is calculated from a linear predictive coefficient decoded by means of a voice decoding method, a whole band energy, a low band energy and a zero cross number that are calculated from a regenerative voice signal output in the past by means of said voice decoding method are used.

2 more elements

A voice detecting apparatus for discriminating a voice section from a non-voice section for every fixed time length for a voice signal, using feature quantity calculated from said voice signal input for every fixed time length, said apparatus comprises:

an LSF calculating circuit for calculating a line spectral frequency (LSF) from the voice signal;
a whole band energy calculating circuit for calculating a whole band energy from said voice signal;
a low band energy calculating circuit for calculating a low band energy from said voice signal;
a zero cross number calculating circuit for calculating a zero cross number from said voice signal;
a line spectral frequency change quantity calculating section for calculating change quantities (first change quantities) of said line spectral frequency;
a whole band energy change quantity calculating section for calculating change quantities (second change quantities) of said whole band energy;
a low band energy change quantity calculating section for calculating change quantities (third change quantities) of said low band energy;
a zero cross number change quantity calculating section for calculating change quantities (fourth change quantities) of said zero cross number;
a first filter for calculating a long-time average of said first change quantities;
a second filter for calculating a long-time average of said second change quantities;
a third filter for calculating a long-time average of said third change quantities;
and
a fourth filter for calculating a long-time average of said fourth change quantities.

10 more elements

an LSF calculating circuit for calculating a line spectral frequency (LSF) from the voice signal;
a whole band energy calculating circuit for calculating a whole band energy from said voice signal;
a low band energy calculating circuit for calculating a low band energy from said voice signal;
a zero cross number calculating circuit for calculating a zero cross number from said voice signal;
a first change quantity calculating section for calculating first change quantities based on a difference between said line spectral frequency and a long-time average thereof;
a second change quantity calculating section for calculating second change quantities based on a difference between said whole band energy and a long-time average thereof;
a third change quantity calculating section for calculating third change quantities based on a difference between said low band energy and a long-time average thereof;
a fourth change quantity calculating section for calculating fourth change quantities based on a difference between said zero cross number and a long-time average thereof;
a first filter for calculating a long-time average of said first change quantities;
a second filter for calculating a long-time average of said second change quantities;
a third filter for calculating a long-time average of said third change quantities;
and
a fourth filter for calculating a long-time average of said fourth change quantities.

10 more elements

A recording medium readable by an information processing device constituting a voice detecting apparatus for discriminating a voice section from a non-voice section for every fixed time length for a voice signal, using feature quantity calculated from said voice signal input for every fixed time length, in which a program is recorded for making said information processing device execute processes (a) to (l):

(a) a process of calculating a line spectral frequency (LSF) from said voice signal;
(b) a process of calculating a whole band energy from said voice signal;
(c) a process of calculating a low band energy from said voice signal;
(d) a process of calculating a zero cross number from said voice signal;
(e) a process of calculating change quantities (first change quantities) of said line spectral frequency;
(f) a process of calculating change quantities (second change quantities) of said whole band energy;
(g) a process of calculating change quantities (third change quantities) of said low band energy;
(h) a process of calculating change quantities (fourth change quantities) of said zero cross number;
(i) a process of calculating a long-time average of said first change quantities;
(j) a process of calculating a long-time average of said second change quantities;
(k) a process of calculating a long-time average of said third change quantities;
and
(l) a process of calculating a long-time average of said fourth change quantities.

10 more elements

(a) a process of calculating a line spectral frequency (LSF) from said voice signal;
(b) a process of calculating a whole band energy from said voice signal;
(c) a process of calculating a low band energy from said voice signal;
(d) a process of calculating a zero cross number from said voice signal;
(e) a process of calculating first change quantities based on a difference between said line spectral frequency and a long-time average thereof;
(f) a process of calculating second change quantities based on a difference between said whole band energy and a long-time average thereof;
(g) a process of calculating third change quantities based on a difference between said low band energy and a long-time average thereof;
(h) a process of calculating fourth change quantities based on a difference between said zero cross number and a long-time average thereof;
(i) a process of calculating a long-time average of said first change quantities;
(j) a process of calculating a long-time average of said second change quantities;
(k) a process of calculating a long-time average of said third change quantities;
and
(l) a process of calculating a long-time average of said fourth change quantities.

10 more elements

Dependencies are inferred from the claim text.

Voice detecting method and apparatus using a long-time average of the time variation of speech features, and medium thereof

Life of this patent

Voice detecting method and apparatus using a long-time average of the time variation of speech features, and medium thereof

Life of this patent

Abstract

Claims21