Method and apparatus for pitch determination of a

专利名称：Method and apparatus for pitch

determination of a low bit rate digital voicemessage

发明人：Jian-Cheng Huang,Floyd Simpson,Sunil

Satyamurti,Kenneth Finlon

申请号：US09410007申请日：19990930公开号：US018407B1公开日：20020709

专利附图：

摘要：A pitch determiner () of a system controller () that generates a smoothed pitch

value for a current frame of a low bit rate voice message includes a pitch functiongenerator () that generates a pitch detection function (PDF) for each frame of digitalsamples of a voice signal, a pitch candidate selector () that selects a future frame pitchcandidate from a pitch detection function (PDF), and a pitch adjuster () that generates thesmoothed pitch value. The pitch adjuster includes a subharmonic pitch corrector () thatdetermines a future frame pitch value by performing pitch subharmonic correction of afuture frame pitch candidate using a roughness factor of the frequency transformedwindow.

申请人：MOTOROLA, INC.

代理人：Randi L. Dulaney

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