| abstract |
FIELD: fire safety. n SUBSTANCE: invention relates to fire safety and provides fire detection at early stages of smouldering and ignition of combustible materials. Device includes a sensor in form of, for example, gas sensor, a matching amplifier, analogue-to-digital converter, microprocessor, light and sound signals, light alarm, sound alarm, modulating code shaper, master oscillator, phase manipulator, power amplifier and transmitting antenna, and at receiving side to receive complex phase-shift keyed (Psk) signals has a receiving antenna, HF amplifier, heterodyne, mixer, intermediate frequency amplifier, total frequency amplifier, amplitude detector, key demodulator of FM signals, multipliers, narrow-band filter, low-pass filter and a recording unit. n EFFECT: technical result is high selectivity and noise-immunity of receiving device by suppressing spurious signals (noise) received over additional channels. n 2 cl, 6 dwg |