On a delta modulation based real time autocorrelator
Jing Yuan, Jing Ou-Yang · 2005
Theoretical analysis indicates that the quantization error of a linear delta modulator (LDM) output can be divided into an equivalent PCM quantization error and a high frequency noise irrelevant to the input. Under certain treatment the autocorrelation of a DM output can approximate that of the input signal's derivative. Simulation and experimental results prove that a delta modulation based autocorrelator (DMAC) is an efficient aid to extracting speech features.