DEVICE TO RECEIVE MULTIFREQUENCY SIGNALS Russian patent published in 2001 - IPC

FIELD: electric communication. SUBSTANCE: invention can find use specifically in receivers of signals of telephone signaling, in systems for transmission of discrete information. Proposed device includes unit 1 to match with communication channel, low frequency filter 2, analog- to-digital converter 3, rejection filter 4, linear detector 5, integrating link 6, first, second, third and fourth threshold elements 7, 17, 21, 23, unit of matched filters 8.1-8.6, unit of linear detectors 9.1-9.6, unit of integrating links 10.1-10.6, unit of controlled keys 11.1-11.6, controlling timer 12, arithmetic unit 13, first, second and third adders 14, 15, 20, first and second ratio computing units 16, 22, inverter 18, time delay unit 19, logic AND gate 24, display unit 25. Given device provides for stable extraction of legitimate signal from mixture of channel noises and parasitic speech signals with the aid of frequency selection of input signal, for isolation of two frequency components with maximum level, for computation of ratio of level of these two components to summary level of other components, for evaluation of power of signal in information band of frequencies, for evaluation of ratio of first and second maxim of frequency components and for evaluation of sign of increment of sum of two greatest frequency components. EFFECT: increased accuracy of reception of multifrequency signals. 1 dwg