Patent ID: 9047878
Filing Date: 2015-06-02
Classification: G10L

Abstract:
1. A speech determination apparatus comprising: a frame extraction processor unit configured to extract, from an input signal having a plurality of frames, a signal portion per frame, with each signal portion having a specific duration, so as to generate a per-frame input signal that is in a time domain; a spectrum generation processor unit configured to convert the per-frame input signal that is in a time domain into a per-frame input signal that is in a frequency domain, thereby generating a spectral pattern that is defined by a spectra of a plurality of spectrums; a peak detection processor unit configured to determine whether an energy ratio is higher than a specific first threshold level, the energy ratio being a ratio of spectral energy of a first spectrum in the spectral pattern to subband energy in a subband that involves the first spectrum, the subband being involved in a plurality of subbands of a specific frequency band, wherein each subband has a specific bandwidth; a speech determination processor unit configured to determine, based on a result of the determination at the peak detection processor unit, whether the per-frame input signal that is in a frequency domain is a speech segment; a frequency averaging processor unit configured to derive average energy, in a frequency domain, based on energy of spectrums in the spectral pattern that are in the plurality of subbands; and a time-domain averaging processor unit configured to derive subband energy for each subband by averaging, in the time domain, and over the plurality of frames, the average energy derived by the frequency averaging processor unit.