Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-09-27
1991-03-19
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 49, G10L 500
Patent
active
050017594
ABSTRACT:
A multi-pulse speech coding method and apparatus capable of encoding speech at a bit rate of 16 kbps or less. The method determines the location and amplitude of a pulse by searching through all of the samples of a criterion function, modifying all of the samples of the criterion function, and them repeating the pulse search. After the predetermined number of pulses have been determined, the method modifies the amplitude of the determined pulse, modifies the criterion function at the location where the pulses are set, and repeats such pulse amplitude modification. The method is, therefore, capable of modifying a pulse amplitude by using only a minimum amount of computation. As compared to the amount of computerization required by a method of the kind which modifies pulse amplitude in a pulse search loop.
REFERENCES:
patent: 4720865 (1988-01-01), Taguchi
patent: 4776015 (1988-10-01), Takeda et al.
"A New Model of LPC Excitation for Producing Natural-Sounding Speech at Low Bit Rates" ICASSP, pp. 614-617, 1982, Atal, et al.
"Multi-Pulse Excited Speech Coder Based on Maximum Crosscorrelation Speech Algorithm" IEEE Global Telecommunications Conf., 23.3, 12/87, Ozawa, et al.
"A Study on Pulse Search Algorithms for Multipulse Excited Speech Coder Realizations" IEEE Journal on Selected Areas in Communications, vol. SAC-4, No. 1, Jan. 1986.
Kemeny Emanuel S.
NEC Corporation
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