Patent ID: 9570057
Date: 2017-02-14
CPC Classifications: G10H,G10L,H04R

Claim:
1. A method of identifying at least one fundamental frequency component of an audio signal, the method comprising receiving and recording an audio event, and converting the recorded audio event into an audio signal, the method further comprising: (a) filtering the audio signal to produce a plurality of sub-band time domain signals; (b) transforming the plurality of sub-band time domain signals into a plurality of sub-band frequency domain signals by mathematical operators; (c) summing together the plurality of sub-band frequency domain signals to yield a single spectrum; (d) calculating the bispectrum of each of the plurality of sub-band time domain signals; (e) summing together the bispectra calculated in (d); (f) calculating the diagonal of the summed bispectra; (g) multiplying the single spectrum and the diagonal of the summed bispectra to produce a product spectrum; and (h) identifying at least one fundamental frequency component of the audio signal from the product spectrum or information contained in the product spectrum.