Pitch lag estimation using frequency-domain lowpass filtering of

Details Pitch lag estimation using frequency-domain lowpass filtering of Pitch lag estimation using frequency-domain lowpass filtering of

1995-05-30

1998-07-14

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704217, 704219, G10L 302

Patent

active

057818800

ABSTRACT:
A pitch estimation device and method utilizing a multi-resolution approach to estimate a pitch lag value of input speech. The system includes determining the LPC residual of the speech and sampling the LPC residual. A discrete Fourier transform is applied and the result is squared. A lowpass filtering step is carried out and a DFT on the squared amplitude is then performed to transform the LPC residual samples into another domain. An initial pitch lag can then be found with lower resolution. After getting the low-resolution pitch lag estimate, a refinement algorithm is applied to get a higher-resolution pitch lag. The refinement algorithm is based on minimizing the prediction error in the time domain. The refined pitch lag then can be used directly in the speech coding.

REFERENCES:
patent: 4989250 (1991-01-01), Fujimoto et al.
Sadaoki Furui, Digital Speech Processing, Synthesis, and Recognition, Dekker, pp. 82,85-87, 1989.
John R. Deller, Jr., John G. Proakis, and John H.L. Hansen, Discrete-Time Processing of Speech Signals, Macmillan, pp. 333-334,355, 1993.
Wolfgang J. Hess, "Pitch and Voicing Determination", in Advances in Speech Signal Processing, edited by Sadaoki Furui and M. Mohan Sondhi, Dekker, p. 15, 1991.

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