SPEECH-OFF DETECTOR FOR PULSE-CODE MODULATION SYSTEM Russian patent published in 1998 - IPC

FIELD: channel static multiplexing systems, speech and multifunctional batch terminals of communication networks with integration of services in case of acoustic noise. SUBSTANCE: speech-off detector has in main channel 1 initial setting unit 2, first and second shift registers 3 and 4, first and second modulo-two adder units 5 and 6, first and second OR gates 7 and 8, first through fifth switches 9 through 13, first and second delay elements 14 and 15, inverter 16, pulse shaper 17, first and second counters 18 and 19, storage unit 20, flip-flop 21, decoder 22; in additional channel 23, it has switch 24 and channel multiplexing unit 25. EFFECT: improved performance characteristics due to introducing circuit implementing comparative analysis of integral level of noncoincidence of signals in speech and noise channels of device. 2 dwg