Partial magnitude rearrangement and harmonic relation confirmation for multiple pitch estimation

Two efficient techniques are proposed in this study for the multiple pitch estimation of polyphonic music. The partial magnitude rearrangement separates the overlapped partials into their possible pitches. The harmonic error can be corrected by harmonic relation confirmation. Random combinations of up to six notes at different pitches are analysed statically within one frame over the samples from 21 pitched instruments. The accuracy, efficiency, and robustness of the method using these two techniques are verified by three groups of experiments. The results show that the proposed techniques achieve a better balance between the higher accuracy and the lower computation cost.