Multi-pitch determination algorithm based on mixture laplacian distribution

A multi-pitch determination algorithm based on mixture Laplacian distribution (MLD) is proposed. MLD replaces the autocorrelation function (ACF) of correlogram which shows the possibility of the lag being the pitch period. The peaks of summary MLDs indicate the multiple pitch periods. Compared with summary correlogram, summary MLDs has better resolution and less pseudo peaks which do not correspond to the pitch period. The proposed algorithm is evaluated on a database of speech utterances mixed with various types of interference. The comparisons show that our algorithm has better performances.