Excitation pulse positioning method in a linear predictive speec

Details Excitation pulse positioning method in a linear predictive speec Excitation pulse positioning method in a linear predictive speec

1990-03-30

1993-03-09

Fleming, Michael R.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381 38, G10L 914

Patent

active

051931400

ABSTRACT:
A method for positioning excitation pulses for a linear predictive coder (LPC) operating according to the multi-pulse principle, i.e. a number of such pulses are positioned at specific time points and with specific amplitudes. The time points and the amplitudes are determined from the predictive parameters (a.sub.k) and the predictive residue signal (d.sub.k), by correlation between a speech representative signal (y) and a composed synthesized signal (y). All possible time positions for the excitation pulses within a given frame interval are provided. The possible time positions are divided into a number (n.sub.f) of phase positions and each phase position is divided into a number of phases (f). All phases are vacant for the first excitation pulse. When this pulse has been positioned, the phase determined for this pulse is denied to the following excitation pulses until all pulses in a frame have been positioned.

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"Generalization of the Multipulse Coding for Low Bit Rate Coding Purposes: The Generalized Decimation", ICASSP 85, IEEE International Conference on Acoustics, Speech, and Signal Processing, Mar. 1985, vol. 1, pp. 256-259, Adoul et al.
"A Regular-Pulse Excited Linear Predictive Codec", Speech Communication, vol. 7, No. 2, Jul. 1988, pp. 209-215, Vary et al.

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