VOICE MESSAGE CODING AND DECODING DEVICE Russian patent published in 1997 - IPC

FIELD: RADIO ENGINEERING; telephone and radio communications. SUBSTANCE: input voice signal is passed in turn through low- and high-frequency filters in coder and frequency distortions appearing in the process are compensated for in decoder. Device has input filter 1, spectrum inverting unit 2, first and second switches 3, 4, adder 5, standard generator 6, control pulse shaper 7, modulo-two adder 8, sync pulse shaper 9, low-frequency filter 10, high-frequency filter 11, input filter 12, spectrum inverting unit 13, standard generator 14, synchronizing unit 15, control signal shaper 16, first and second switches 17, 18, low-frequency filter 19, high-frequency filter 20. EFFECT: reduced intelligibility at coder output without impairing speech sounding at decoder output. 12 dwg