LPC for voice conversion

[Mouhamad A]

Is it possible to LPCs to accomplish voice conversion between speakers A and B, by estimating the LPC filter and residual signal from speaker A and B then filtering the residual signal from A with the LPC filter of B?

[Simon]

Yes, that’s a reasonable approach.

In this classic paper on voice conversion they use the cepstrum to represent the spectral envelope rather than LPC co-efficients.

In this paper, we do use linear prediction as the parameterisation of the spectral envelope. But we don’t use the co-efficients of the difference equation (the LPC parameters) directly – we transform them to another representation called line spectral frequencies (LSFs) for reasons explained in the paper.

Rather than use the source speaker’s residual (which is one option), we predict the residual from the converted spectral envelope.

[Author]

Posts