Method and arrangement for determining signal pitch

Details Method and arrangement for determining signal pitch Method and arrangement for determining signal pitch

1993-02-04

1994-06-14

Black, Thomas G.

Boots, shoes, and leggings

364554, 381 38, 324 7613, G01R 2316

Patent

active

053216369

ABSTRACT:
A method and an arrangement are described by means of which a pitch in a signal (s(t)) can be determined. In fact the probability density function (pdf) of the pitch is determined as a function of frequency. A pitch can then be derived from this probability density function. First a frequency spectrum A(f) is derived from a signal portion situated in a specific time interval T. Then, the probability contribution (K.sub.1i, K.sub.1j, . . . . ) is determined for a number of frequency components (f.sub.i, f.sub.j, . . . ), stating the relative probability that a pitch at a frequency (f.sub.1) is the result of a frequency component (f.sub.i, f.sub.j, . . . ). The probability contributions (K.sub.1i, K.sub.1j, . . . ) are multiplied by one another to obtain a probability density (K.sub.f1). This procedure is iterated for successive frequencies (f.sub.2, . . . ) to obtain at least a second probability density. The probability densities K.sub.f1, K.sub.f2, . . . are each a measure of the relative probability that a pitch occurs at the frequencies f.sub.1, f.sub.2, . . . , respectively. The probability density function (pdf) from which one or more pitches can be derived (FIG. 4 a) can be determined from the computed probability densities (K.sub.f1, K.sub.f2, . . . ).

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Duifhuis, H. et al. "Measurement of Pitch in Speech: An Implementation of Goldstein's Theory of Pitch Perception", J. Acoustical Society of America, vol. 71, No. 6, Jun. 1982, pp. 1568-1580.
Hermes, D. J. "Measurement of Pitch by Subharmonic Summation", Journal Acoustical Society of America, vol. 83, No. 1, Jan. 1988, 257-264.

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