Efficient Implementation of Probabilistic Multi-Pitch Tracking

TitleEfficient Implementation of Probabilistic Multi-Pitch Tracking
Publication TypeConference Paper
Year of Publication2011
AuthorsWohlmayr, M., R. Peharz, and F. Pernkopf
Conference Name36th International Conference on Acoustics, Speech and Signal Processing (ICASSP 2011)

We significantly improve the computational efficiency of a probabilistic approach for multiple pitch tracking. This method is based on a factorial hidden Markov model and two alternative interaction models for magnitude and log-magnitude spectra, respectively. The main computational bottleneck comprises the determination of observation likelihoods. However, we show that up to 99.5% of the smallest likelihood values can be discarded at each time frame without affecting the overall tracking accuracy. For both interaction models, we present a heuristic to efficiently find the largest likelihood values. Experiments on the GRID database show that the proposed methods result in a major speedup without significantly changing tracking accuracy.

Citation Key1831