| 摘要 |
FIELD: radio communications; receiving broadband signals on narrow-band signal and pulse noise background. ^ SUBSTANCE: proposed device has series-connected narrow-band filter whose input functions as channel signal input, amplifier, limiter, adjustable amplifier, phase shifter whose output functions as channel signal output, and also envelope detector, low-pass filter, and threshold unit. Adjustable-amplifier control input is connected to output of comparator whose two inputs are connected to channel automatic gain control input and to signal quality estimate input. Novelty is introduction of multiplier whose other input is connected through high-pass filter to envelope detector output, band filter, one more phase shifter, and switching unit whose signal input is connected to amplifier output; newly introduced are also amplitude detector and comparison unit whose other input is connected to low-pass filter output. Multiplier, high-pass filter, band filter, additional phase shifter, and switching unit are series-connected between limiter output and adjustable amplifier input. Amplitude detector and comparison unit are series-connected between band filter output and switching unit control input. Minimal- and maximal-level selection units are series-connected between low-pass filter output and signal quality estimate input; their other outputs are connected, respectively, to outputs of amplitude detector and threshold unit. ^ EFFECT: enhanced noise immunity. ^ 1 cl, 5 dwg |
