1. In a system for jamming wireless communications with the aid of a searching receiver for ascertaining senders which are engaged in the transmission of messages, a powerful jamming transmitter for radiating jamming signals on the waves of ascertained senders, whereby said receiver and transmitter are alternately operative to ascertain transmitting senders and to transmit jamming signals, respectively, which comprises means at the searching receiver for converting received frequency signals into lower frequency ranges, means for successively converting said lower frequency range signals into a plurality of individual ranges, means forming a group of frequency-analyzing channels, means for connecting said frequency-analyzing channel means to respective outputs of said plurality of individual ranges, whereby each individual range is searched for frequencies therein by the common group of frequency-analyzing channels, means operatively connected to said frequency-analyzing channel means responsive upon ascertainment of a signal thereby, to effect jamming transmission corresponding to the received frequency of such ascertained signal.
Disclosed and claimed in a communications system which permits the simultaneous reception and jamming of a transmitted radio frequency signal. This is accomplished by sampling the signal for a minimal period with the jammer off, operating the jammer for a much longer time than was previously thought possible, then using the coefficients output from a linear prediction filter to provide an estimate signal from the transmitted signal while the jammer transmitter is on. The coefficients may be smoothed by averaging over several segments. In addition, if the transmitted signal was a voice signal, voiced-unvoiced decision logic may be used to improve the system's performance.
