Patent ID: 7254534

Claim:
A wideband speech encoding method comprising: sampling the speech to obtain successive voice frames each comprising a predetermined number of samples, and each voice frame having determined parameters of a code-excited linear prediction model, the parameters comprising a long-term excitation digital word extracted from an adaptive coded directory, and an associated long-term gain, and a short-term excitation word extracted from a fixed coded directory and an associated short-term gain; and updating the adaptive coded directory on the basis of the extracted long-term excitation word and of the extracted short-term excitation word, and comprising adding the product of the long-term excitation digital word times the associated long-term gain with the product of the short-term excitation word times the associated short-term gain to generate a summed digital word, and filtering the summed digital word with a low-pass filter having a cutoff frequency greater than a quarter and less than a half of a sampling frequency to obtain a filtered word, and updating the adaptive coded directory with the filtered word.