Automatic carrier pitch estimation for coherent demodulation

This paper proposes a method for estimating carrier frequencies for coherent demodulation using low-frequency amplitude modulation criteria and a frequency-smoothing regularizer. This process combines with coherent modulator estimation to create an iterative approach for simultaneously determining the optimally low-frequency modulator and corresponding carrier for an arbitrary signal. The method is demonstrated with unsupervised semi-blind source separation of speech mixed with several types of tonal interference.