Abstract: A method and system for converting a source voice to a target voice is disclosed. The method comprises: recording source voice data and target voice data; extracting spectral envelope features from the source voice data and target voice data; time-aligning pairs of frames based on the extracted spectral envelope features; converting each pair of frames into a frequency domain; generating a plurality of frequency-warping factor candidates, wherein each of the plurality of frequency-warping factor candidates is associated with one of the pairs of frames; generating a single global frequency-warping factor based on the candidates; acquiring source speech; converting the source speech to target speech based on the global frequency-warping factor; generating a waveform comprising the target speech; and playing the waveform comprising the target speech to a user.

Abstract: A voice coder configured to resolve periodic and aperiodic components of spectra is disclosed. The method of voice coding includes parsing the speech signal into a plurality of speech frames; for each of the plurality of speech frames: (a) generating the spectra for the speech frame, (b) parsing the spectra of the speech frame into a plurality of sub-bands, (c) transforming each of the plurality of sub-bands into a time-domain envelope signal, and (d) generating a plurality of sub-band voicing factors, wherein each sub-band voicing factor indicates the harmonicity of one of the plurality of sub-bands, and each sub-band voicing factor is based on the periodicity of one of said time-domain envelope signals associated with one of the plurality of sub-bands.