Accession Number : ADA308580

Title :   Efficient Calculation of Spectral Tilt from Various LPC Parameters,

Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA

Personal Author(s) : Goncharoff, V. ; VonColln, E. ; Morris, R.

PDF Url : ADA308580

Report Date : MAY 1996

Pagination or Media Count : 6

Abstract : A coarse measure of a discrete signal's power distribution vs. frequency is its 'spectral tilt,' which we define as the slope of least squares linear fit to the log power spectrum (0 < or = omega < or = (pi)rads/sec). One application of calculating spectral tilt is to help discriminate between voiced and unvoiced - silent time segments while processing sampled speech signals. When linear predictive coding (LPC) of speech is used to model its short time spectrum, it is computationally more efficient to calculate spectral tilt directly from the LPC model parameters instead of from the log power spectrum. In this paper we present methods for calculating spectral tilt from cepstral coefficients, pole values, and polynomial coefficients. These methods are all based on calculating spectral tilt as a weighted sum of cepstral coefficients.

Descriptors :   *VOCODERS, *CEPSTRUM TECHNIQUE, SIGNAL PROCESSING, LINEAR SYSTEMS, COMPUTATIONS, PREDICTIONS, SHORT RANGE(TIME), CODING, COEFFICIENTS, SAMPLING, DISCRETE DISTRIBUTION, SPEECH, POWER DISTRIBUTION.

Subject Categories : Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE