Speech Pitch Shifting using Complex Continuous Wavelet Transform

Pitch shifting finds applications in voice morphing and other speech related applications. We have used complex wavelet transform to obtain and manipulate pitch of the signal. The novelty of our model is extraction of wavelet `pitch-scale' values, which correspond to average pitch value of signal's voiced frame. The phase matrix corresponding to this scale is altered keeping modulus unchanged. The pitch has been measured using autocorrelation in wavelet domain, both for unaltered frame and for modified frame. The results obtained indeed display altering of pitch as desired.