Method and apparatus for shifting pitch of acoustic signals

Details Method and apparatus for shifting pitch of acoustic signals Method and apparatus for shifting pitch of acoustic signals

2005-06-21

2005-06-21

Tran, Sinh (Department: 2644)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C084S603000, C084S622000

Reexamination Certificate

active

06909924

ABSTRACT:
A method for shifting a pitch of acoustic signals, which are expressed in terms of a series of digital signals, to an optional pitch, uses a compacting and/or expanding process on the time axis and cross-fades a fade-in acoustic signal, stored in a memory with a fade-out acoustic signal, also stored in memory. The compaction and/or expansion of the time axes minimizes phase differences between the fade-in and fade-out acoustic signals to minimize tremolo in the output signal. The reduction in phase difference employs fundamental tones of the two series of signals selected by low-pass filtering the acoustic signal. One embodiment performs two-step compensation with a rough compensation using blocks of the digital signals and a fine compensation using samples from blocks.

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Applicant's admitted prior art, Figures 8-12, pp. 2-6.
Applicant's admitted prior art, Figures 8-12, pp. 2-6.

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