Patent ID: 6393390
Filing Date: 2002-05-21
Classification: G10L

Abstract:
In a system having a working memory and a digital processor, a method for encoding speech signals comprising the steps of:providing an encoder including (a) a pitch predictor and (b) a source excitation codebook, the pitch predictor having various parameters, and being a multi-tap pitch predictor utilizing a codebook subdivided into at least a first vector codebook and a second vector codebook; using the pitch predictor, (i) removing certain redundancies in a subject speech signal, and (ii) vector quantizing the pitch predictor parameters, said vector quantizing employing product code vector quantization, the vector quantizing reducing the computational complexity and memory requirements of the encoder; and using the source excitation codebook, (i) indicating pulses in the subject speech signal, and (ii) deriving ternary values (1, âˆ’1, 0) indicating pulses of the subject speech signal, the ternary values further reducing the computational complexity and memory requirements of the encoder.