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Time/pitch modification using narrowband am-FM signals

Time-scale modification and pitch modification are two of the most fundamental effects in telecommunications and music information processing. The phase vocoder provides a good framework for such modifications. However, it has long been known that the technique introduces an undesired degrading factor known as “phasiness”. To remove this phenomenon we propose a new phase vocoder, which adopts an FIR narrowband filter bank for analysis, and an AM-FM signal for the synthesis of each band. It is applied to time-scale/pitch conversion, vibrato extraction and addition for reading and singing voices. The impairment was removed and consequently the modified sound quality improved.