METHOD AND APPARATUS FOR DIGITAL ATTENUATION BY PATTERN SHIFTING

摘要

A digital attenuator is disclosed which is capable of having the output PCM signal attenuated nearly in proportion to the input PCM signal level based upon simple logic operations of Pout = alpha Pin + N where Pout = output PCM signal Pin = input PCM signal processed by a compressor alpha = A REAL NUMBER SATISFYING THE CONDITION 0 < alpha < 1, AND N = a real number larger than or equal to 0.