Method and device for recognizing speech

摘要

A speech is recognized using ACF factors extracted from running autocorrelation functions calculated from the speech. The extracted ACF factors are a Wφ(0) (width of ACF amplitude around zero-delay origin), a Wφ(0)max (maximum value of the Wφ(0)), a τ1 (pitch period), a φ1 (pitch strength), and a Δφ1/Δt (rate of the pitch strength change). Syllables in the speech are identified by comparing the ACF factors with templates stored in a database.

主权项

1. A method for recognizing speech, comprising steps of:
recording speech signals by a recording unit; attenuating, by a LPF, a high frequency component of the speech signals received from the recording unit; converting, by an AD converter, the speech signals received from the LPF from analog signal to digital signal; storing, by a storage unit, the speech signals received from the AD converter; reading out, by a processor, the speech signals stored in the storage unit; calculating, by the processor, running autocorrelation functions from the speech signals read out from the storage unit; extracting, by the processor, following ACF factors from the running autocorrelation functions:
a Wφ(0) which is a width of ACF amplitude around zero-delay origin,a Wφ(0)max which is a maximum value of the Wφ(0);a τ1 which is a pitch period;a φ1 which is a pitch strength; anda Δφ1/Δt which is a rate of the pitch strength change; identifying, by the processor, syllables in the speech signals by comparing the ACF factors with templates stored in a database.