Much research has shown that the voice source has strong influence on the quality of speech processing [4][5][6]. But in most of the existing speech modification algorithms, the effect of the voice source variation is neglected. This work explains why the existing modification scheme can’t truly reflect the voice source variation during pitch modification. We use synthesized voiced speech sound to compare an existing pitch modification scheme with our proposed voice source scaling based modification scheme. Results show that voice source scaling based pitch modification can be used for wider range pitch modification. Key word: speech pitch modification, voice source, formant synthesis.

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