Two-pitch estimation for co-channel speakers separation

This paper deals with the estimation of fundamental frequency for two speakers recorded on the same channel. We estimate a set of speech models based upon sinusoidal plus autoregressive noise representations. We then detect the best model from this set using Rissanen criterion. Equivalent to a penalized log-likelihood, the criterion is also used to carry out a voicing detection. The detector compares the likelihood of a sinusoid plus noise model with the likelihood of a simple autoregressive model. Several simulations are presented to illustrate this estimation method.