Patent ID: 7957978

Claim:
A method for encoding an analog signal subdivided into time frames and to which a synthetic signal is matched, comprising: using a communication terminal device to encode an analog signal by breaking down the analog signal into time frames and synthetically producing a synthetic signal to match the analog signal time frame by time frame via a synthesis filter, the communication terminal device having at least one adaptive codebook that contains a plurality of sample values, the sample values being comprised of at least one excitation signal from earlier time frames; exciting the synthesis filter via an excitation signal, the excitation signal formed by the communication terminal device performing an excitation signal generation method comprising: selecting a segment corresponding to a length of a current time frame from a plurality of the sampled values contained in the at least one adaptive codebook using a reference parameter dependent on a basic voice frequency that assumes non-integer values that identify locations for intermediate values positioned between the sampled values, choosing intermediate values corresponding to the sampled values, and using all the sampled values and all the intermediate values for forming the excitation signal.