Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1983-12-27
1987-12-29
Heckler, Thomas M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 500
Patent
active
047165928
ABSTRACT:
A voice encoding system is constituted by a short time voice signal series producing circuit inputted with a discrete voice signal series for dividing the same at each short time; a parameter extracting circuit for extracting a parameter representative of a spectrum envelope from the short time voice signal series and encoding the parameter; an impulse response series calculating circuit for calculating the impulse response series based on the parameter representative of the spectrum envelope; an autocorrelation function sequence calculating circuit utilizing the impulse response series; a cross-correlation function sequence calculating circuit utilizing the impulse response series and the short time voice signal series; a circuit for calculating and encoding an excitation signal series of the short time voice signal series by utilizing the autocorrelation function sequence; and a circuit for combining and outputting a code of the parameter representative of the spectrum envelope and a code representative of the excitation signal series. With the system, high quality voice encoding can be made at a transmission rate of less than 10k bits/second with a relatively small amount of calculation.
REFERENCES:
patent: 4544919 (1985-10-01), Gerson
Makhoul, J., "Stable and Efficient Lattice Methods for Linear Prediction", IEEE ASSP-25, No. 5, Oct., 1977, pp. 423-428.
"A New Model of LPC Excitation for Producing Natural-Sounding Speech at Low Bit Rates" on pp. 614 to 617 of Advanced Manuscripts Published by I.C.A.S.S.P., 1982.
J. Max's paper of the title "Quantizing for Minimum Distortion", IRE Transactions on Information Theory, 1960, Mar., pp. 7 to 12.
J. Makhoul's paper entitled "Linear Prediction: A tutorial Review", pp. 561 to 580, Apr., 1975 of Proceedings of IEEE.
R. Viswanathan et al paper of the title "Quantizing Properties of Transmission Parameters in Linear Predictive Systems", pp. 309 to 321, IEEE Transactions on Acoustics, Speech, and Signal Processing, Jun., 1975.
Araseki Takashi
Ozawa Kazunori
Heckler Thomas M.
NEC Corporation
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