Patent ID: 9495973
Filing Date: 2016-11-15
CPC Classification: G10L

Claim Text:
1. A speech recognition apparatus, comprising: a band-pass filter, performing a band-pass filtering of a first consonant frequency band and a second consonant frequency band for a voice signal in order to generate a first band-pass filter signal and a second band-pass filter signal respectively; and a central processing unit, coupled to the band-pass filter, and dividing the voice signal, the first band-pass filter signal and the second band-pass filter signal into a plurality of voice frames, wherein each of the voice frames comprises an N number of sampling signals, N is a positive integer, the central processing unit calculates energies of the sampling signals in a target voice frame in order to obtain an energy of an original voice sampling signal, an energy of a first consonant frequency band signal and an energy of a second consonant frequency band signal, and determines whether the original voice sampling signal corresponding to the target voice frame is a noise signal according to a ratio of the energy of the first consonant frequency band signal to the energy of the second consonant frequency band signal, a ratio of the energy of the first consonant frequency band signal to the energy of the original voice sampling signal and a ratio of the energy of the second consonant frequency band signal to the energy of the original voice sampling signal.