Low complexity VQ for multi-tap pitch predictor coding

Pitch predictors are successfully used in Linear Prediction Analysis-by-Synthesis (LPAS) coders to model periodicity in speech. The various structures of pitch predictors are investigated and used in LPAS coders. In most of the low bit-rate LPAS coder design, single-tap or three-tap pitch are commonly used. Higher prediction gain can be achieved by using additional taps. 5-tap pitch predictor is rarely used in low bit-rate speech coder because of high complexity and bandwidth requirement in encoding additional tap gains. This paper describes a technique for reducing the complexity and bandwidth requirement for 5-tap pitch predictor.