Voiced/unvoiced decision based on frequency band ratio

Details Voiced/unvoiced decision based on frequency band ratio Voiced/unvoiced decision based on frequency band ratio

1997-06-09

1999-09-28

Knepper, David D.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

G10L 700

Patent

active

059603887

ABSTRACT:
Input audio signal is divided on a block-by-block basis. Frequency domain conversion is done on each of the blocks. Voiced bands of the frequency domain data for one of the blocks are searched for a voiced band B.sub.VH with the highest center frequency if it is decided that there are one or more shift points of voiced (V)/unvoiced (UV) decision data of all the bands. The number N.sub.V of voiced bands having center frequency less than that of the band B.sub.VH is found, so as to decide whether a proportion of the voiced bands is equal to or higher than a predetermined threshold N.sub.th, thereby deciding one V/UV boundary point. Thus, it is possible to replace the V/UV decision data for each band by information on one demarcation in all bands, thereby reducing data volume and bit rate.

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