Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1997-10-24
2000-04-04
Zele, Krista M.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704207, G10L 1902
Patent
active
060472545
ABSTRACT:
The present invention comprises an improved vocoder system and method for estimating the pitch of a speech signal. The speech signal comprises a stream of digitized speech samples. The speech samples are partitioned into frames. For each frame of the speech signal, an optimal order-two inverse filter is determined. The optimal order-two inverse filter is determined by computing an order-two inverse filter at various locations within the speech frame. For each order-two inverse filter an energy value is calculated which represents the proportion of energy which would remain if the speech signal were filtered with the order-two inverse filter. The order-two inverse filter which minimizes the energy proportion is chosen to be the optimal order-two inverse filter. The optimal order-two inverse filter is then used to filter the samples of the speech frame. An autocorrelation is performed on the filtered signal for a range of tine-delay values. The peaks of the autocorrelation function are analyzed to determine the pitch period.
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Bartkowiak John G.
Ireton Mark A.
Advanced Micro Devices , Inc.
Hood Jeffrey C.
Opsasnick Michael N.
Zele Krista M.
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