DEVICE FOR RECEPTION OF MULTIFREQUENCY SIGNALS Russian patent published in 2000 - IPC

FIELD: communication equipment. SUBSTANCE: device may be used for reception of multifrequency signals and interaction between telephone exchange stations using "2 of 6" code. Device has serial circuit of input amplifier, which input is designed as device input, first gate, amplitude corrector and second gate, which output is connected to input of amplitude detector, first input of second comparator and input of first mean signal value detector. Output of first mean signal value detector is connected to second input of second comparator. In addition device has envelope detector, which input is connected to output of input amplifier and which output is connected to inputs of minimal and maximal envelope value detectors. In addition device has serial circuit of minimal envelope value detector, first memory unit, and comparison circuit, serial circuit of maximal envelope value detector, second memory unit and voltage divider. Output of pulse generator is connected to inputs of first and second memory units directly and to inputs of minimal and maximal envelope value detectors through delay gate. Input of frequency divider is connected to output of pulse generator. In addition device has second mean signal value detector, amplitude detector, which output is connected to first input of first comparator directly and to second input of first comparator through second mean signal value detector. Outputs of first and second comparators are connected respectively to first inputs of first and second counters, which second inputs are connected to output of frequency divider and outputs are connected to inputs of decoder. Output of voltage divider is connected to second input of comparison circuit. Output of comparison circuit is connected to inputs of first and second gates. Second output of first gate is connected to second input of second gate. Outputs of decoder are designed as device outputs. EFFECT: simplified design, increased reliability of operations. 1 dwg