Patent ID: 9454976
Filing Date: 2016-09-27
CPC Classification: G10L

Claim Text:
1. A method for indicating when voiced sounds or unvoiced sounds are present in speech sounds, said method comprising: converting, with an analog-to-digital converter, the speech sounds to a speech signal comprising sequential digitized values; integrating the speech signal, thereby generating an integral signal; differentiating the speech signal, thereby generating a differential signal; subtracting the integral signal from the speech signal, thereby producing a speech-minus-integral signal; subtracting the differential signal from the speech signal, thereby producing a speech-minus-differential signal; differentiating the speech-minus-integral signal, thereby producing a refined differential signal; integrating the speech-minus-differential signal, thereby producing a refined integral signal; when the refined integral signal exceeds a refined-integral-signal threshold, generating a first output signal, thereby indicating that a voiced sound is present; and when the refined differential signal exceeds a refined-differential-signal threshold, generating a second output signal, thereby indicating that an unvoiced sound is present.