Refinement of pitch detection

Details Refinement of pitch detection Refinement of pitch detection

2005-04-26

2005-04-26

{hacek over (S)}mits, Tālivaldis Ivars (Department: 2655)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

06885986

ABSTRACT:
Successive pitch periods/frequencies are accurately determined in an audio equivalent signal. Using a suitable conventional pitch detection technique, an initial value of the pitch frequency/period is determined for so-called pitch detection segments of the audio equivalent signal. Based on the determined initial value, a refined value of the pitch frequency/period is determined. To this end, the signal is divided into a sequence of pitch refinement segments. Each pitch refinement segment is associated with at least one of the pitch detection segments. The pitch refinement segments are filtered to extract a frequency component with a frequency substantially corresponding to an initially determined pitch frequency of an associated pitch detection segment. The successive pitch periods/frequencies are determined in the filtered signal.

REFERENCES:
patent: 5781880 (1998-07-01), Su
patent: 0527527 (1993-02-01), None
patent: 0527529 (1993-02-01), None
“Measurement of Pitch by Subharmonic Summation”, D.J. Hermes, Journal of the Acoustical Society of America, vol. 83, No. 1, 1988, pp. 257-264.
“Multiband Excitation Vocoder”, Daniel W. Griffin and Jae S. Lim, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 36, No. 8, Aug. 1988, ppgs. 1223-1235.

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