Patent · US Active

Perceptual harmonic cepstral coefficients as the front-end for speech recognition

US7756700B2 · kind B2 · utility

4Cited by

10References

17Claims

0Family size

Assignee

The Regents of the University of California · US

Inventors

Kenneth Rose · Goleta, US
Liang Gu · Dongguan, CN

Key dates

Filing date	Feb 1, 2008
Grant date	Jul 13, 2010
Priority date	—
Expiry date	Sep 14, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG10L2025/935
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Pitch estimation and classification into voiced, unvoiced and transitional speech were performed by a spectro-temporal auto-correlation technique. A peak picking formula was then employed. A weighing function was then applied to the power spectrum. The harmonics weighted power spectrum underwent mel-scaled band-pass filtering, and the log-energy of the filter's output was discrete cosine transformed to produce cepstral coefficients. A within-filter cubic-root amplitude compression was applied to reduce amplitude variation without compromise of the gain invariance properties.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.