Apparatus and methods for coding, decoding, analyzing and synthesizing a signal

摘要

In an ADPCM (Adaptive Differential PCM) system, in which the signal is commonly coded in Ci, Qn, and sigma parameters, a lower sampling rate which normally causes distortion is made possible by deriving additional parameters Ak, Bk as a function of the error (distortion) between the original signal Sn and the sampled signal Yn. The Ak, Bk coefficients control a distortion filter at the receiver.