Method of and circuit arrangement for automatic signal-level control

摘要

A binary input signal S multiplied by a level-controlling modifier Xn-1 is periodically sampled to determine its amplitude whose value is then differentially combined with a fixed reference value R to produce an error signal. The latter is multiplied by the same modifier Xn-1 and by a fractional coefficient k to yield a corrective value which is then algebraically combined with modifier Xn-1 to produce an updated modifier Xn for the next sampling cycle. To avoid instability, the modified input signal may be subjected to a limitation of its dynamic range before or after sampling. A load to be driven by the input signals may receive the modified signal itself or the modifier used to control its level.