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Title:
VOICE SECTION DETECTION SYSTEM
Document Type and Number:
Japanese Patent JPH0424693
Kind Code:
A
Abstract:

PURPOSE: To detect a correct voice section by detecting a voice section by using a signal, which is so pre-emphasized that bands where respective band powers of a noise obtained by a noise estimating means are small are emphasized, as an input signal.

CONSTITUTION: This system is equipped with a detection part 2 which divides the input signal into ≥1 frequency band to find the power of respective bands, the estimation part 3 which estimates the powers N(w) of the respective bands of an environmental noise from the section of the input signal where there is no vice present and holds the powers, and a pre-emphasis part 4 which emphasizes bands where the respective band powers N(w) of the obtained noise are small. Then, the section detection is performed by using the pre-emphasized signal as the input signal. Thus, the signal which is so pre-emphasized 4 that bands where the noise is small are emphasized is used as the input signal to perform the section detection, thereby decreasing the probability of misdetection. Consequently, even if the noise is one-sided in some band, correct voice recognition becomes possible.


Inventors:
MATSUSHITA MITSUGI
Application Number:
JP1990000128872
Publication Date:
January 28, 1992
Filing Date:
May 18, 1990
Export Citation:
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Assignee:
RICOH KK
International Classes:
G10L11/00; G10L11/02; G10L15/02; G10L15/04; G10L15/20; G10L21/02; (IPC1-7): G10L3/00; G10L3/02; G10L7/08



 
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