FIELD: electrocommunication. SUBSTANCE: invention is intended specifically for reception of control and interaction signals transmitted in mix of group 32-channel digital 2048 kilobytes flow with nonlinear PCM. Versatile digital group receiver processes two- frequency signals of dialing-in in "two-out-of-six" code and single-frequency signals of "station response", "network monitoring", "automatic identification of number" type in each of 32 channels. These signals are used to control switching equipment of digital electron automatic telephone exchanges with nonlinear PCM. Objective of proposed invention consists in expansion of dynamic range of reception level of two- frequency signal and in increased noise immunity of adaptive digital group receiver of control and interaction signals with nonlinear PCM which are achieved thanks to automatic gain control of signal across input of receiver. Adaptive digital group receiver incorporates on-line storage 1, address switch 2, unit 3 of generators, first 4 and second 5 permanent storages, automatic gain control unit 6, first 7 and second 8 code multipliers, first 9 and second 10 counters, computer 11, first 12 and second 14 registers and code comparator 13. Receiver carries out accelerated single-channel processing of group signal in the course of which nonlinear eight-digit code of counts is converted to four-digit linear code in each of 32 channels. Usage of automatic gain control unit prevents overloading of code converter and corrects nonlinear distortions across its output which contributes to expansion of dynamic range of reception levels of two-frequency signal, to rise of permissible " skew " in levels of harmonic components of two-frequency signal and growth of noise immunity in process of reception of signal under condition of " interval-free package " when dialing-in signals follow one another without any interruption. EFFECT: expanded dynamic range of levels of reception of two-frequency signal and increased noise immunity of adaptive digital group receiver of control and interaction signals. 2 dwg
