Analysis-by-Synthesis Algorithms for Low Bit Rate Coding
G. Riccardi, Gian Antonio Mian · 2005
In speech coding at low bit-rates, the computation of a robust excitation signal is a key point, which characterizes the perceptive quality provided by a vocoder. Recently a lot of work has been done in this direction, namely for good quality and coding efficiency in the design of vocoders [4-6]. This work proposes a set of algorithms which apply the rationale of the Analysis by-Synthesis together with High Resolution technique to low-bit rate coding. In the following we shall call this technique High Resolution Analysis-by-Synthesis (HRAS). As a whole this method provides a precise Analysis parameter estimation and a detailed excitation signal used in signal reconstruction.