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Title:
VOICE DETECTION SYSTEM
Document Type and Number:
Japanese Patent JPH03236100
Kind Code:
A
Abstract:

PURPOSE: To reduce an omission and the addition of a noise by calculating feature parameters from a voice signal and projecting in a specific main component vector space, discriminating whether a voice signal is a voiceless or voiced sound according to the position of the projective point, and increasing voice/ voiceless-sound detection accuracy.

CONSTITUTION: The voice signal is inputted and encoded by a voice encoder 41 and a noise encoder 42. One of the outputs of the encoders 41 and 42 is inputted to a cell generating circuit 46 through a selector 45 and made into a cell. The selector 45 is switched according to the discrimination result of a voiceless/voiced-sound discriminating device 43 and only the voiced section of the voice signal is made into the cell. A noise detector 44 detects only the voiceless sound section, wherein a background noise is encoded by the noise encoder 42. The selector 45 is switched to the side of the noise encoder 42 when the discriminating device 43 detects the voiceless sound. The device 43 calculates the LPC cepstrum C of the input voice signal to analyze the main component, an inner product calculator 51 finds the projection point Q of C, and the discriminating device 56 decides whether a frame is voiced or voiceless according to the Q.


Inventors:
AKAMINE MASAMI
Application Number:
JP1990000031424
Publication Date:
October 22, 1991
Filing Date:
February 14, 1990
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
G10L11/00; G10L11/02; G10L15/04; (IPC1-7): G10L3/00; G10L9/00



 
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