Signal Adaptive FIR/IIR Predictors for Minimizing Entropy

摘要

The present document relates to coding. In particular, the present document relates to coding using linear prediction in combination with entropy encoding. A method (600) for determining a general prediction filter for a frame of an input signal (111) is described. The z-transform of the general prediction filter comprises an approximation to the z-transform of a finite impulse response, referred to as FIR, filter with the z variable of the FIR filter being replaced by the z-transform of an allpass filter. The FIR filter comprises a plurality of FIR coefficients (412). The allpass filter exhibits a pole defined by an adjustable pole parameter. The method (600) comprises determining the pole parameter and the plurality of FIR coefficients, such that an entropy of a frame of a prediction error signal (414) which is derived from the frame of the input signal (111) using the general prediction filter defined by the pole parameter and the plurality of FIR coefficients (412) is reduced.