An improvement regarding the down pitching quality of the Pitch Synchronous Overlap Add (PSOLA) technique is presented. The behavior of the common PSOLA algorithm when decreasing the input signal's pitch by one octave or even less is analyzed. A new grain processing algorithm is proposed, which modifies the synthesis grains depending on the synthesis period. The time domain and frequency domain properties of the proposed algorithm are discussed. The presented algorithm improves the perceived quality of the PSOLA algorithm when down-pitching while preserving the low complexity.
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