Excitation synchronous time encoding vocoder and method

Details Excitation synchronous time encoding vocoder and method Excitation synchronous time encoding vocoder and method

1993-05-28

1995-12-26

MacDonald, Allen R.

395 217, G10L 900

Patent

active

054795591

ABSTRACT:
A method for excitation synchronous time encoding of speech signals. The method includes steps of providing an input speech signal, processing the input speech signal to characterize qualities including linear predictive coding (LPC) coefficients, epoch length and voicing and characterizing the input speech signals on a single epoch time domain basis when the input speech signals comprise voiced speech to provide a parameterized voiced excitation function. The method further includes steps of characterizing the input speech signals for at least a portion of a frame when the input speech signals comprise unvoiced speech to provide a parameterized unvoiced excitation function and encoding a composite excitation function including the parameterized unvoiced excitation function and the parameterized voiced excitation function to provide a digital output signal representing the input speech signal.

REFERENCES:
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patent: 5127053 (1992-06-01), Koch
Granzow et al., "High-Quality Digital Speech at 4 KB/S", 1990, pp. 941-945, Globecom '90: IEEE Global Telecommunications Conference.
Marques et al., "Improved Pitch Prediction with Fractional Delay in CELP Coding", 1990, pp. 665-668, ICASSP '90: Acoustics, Speech & Signal Processing Conf.
Nathan et al., "A Time-Varying Analysis Method for Rapid Transitions in Speech", 1991 pp. 815-824, IEEE Transactions on Signal Processing.
Wood et al., "Excitation Synchronous Formant Analysis", Apr. 1989, pp. 110-118, IEE Proceedings; Part I: Communications, Speech & Vision.
An article entitled "High-Quality Speech Coding at 2.4 to 4.0 KBPS Based On Time-Frequency Interpolation" by Yair Shoham, Speech Coding Research Dept., AT&T Bell Laboratories, 1993 IEEE, (1993), pp. 167-170.
An article entitled "Implementation and Evaluation of a 2400 BPS Mixed Excitation LPC Vocoder" by Alan V. McCree and Thomas P. Barnwell III, School of Electrical Engineering, Georgia Institute of Technology, (1993), pp. 159-162.
An article entitled "Excitation-Synchronous Modeling of Voiced Speech" by S. Parthasathy and Donald W. Tufts. From IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-15, No. 9., (Sep. 1987), pp. 1241-1249.
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