1. A system for isolating individual channels comprising: a receiver for receiving a transmitted signal and generating an input signal; a switch coupled to the receiver, the switch receiving the input signal; a plurality of multipliers, each having an input coupled to the switch and an output, each receiving the input signal from the switch; a summer coupled to the outputs of each of the plurality of multipliers for generating an output; and a multiplication factor system for providing multiplication factors to the multipliers, wherein a predetermined frequency channel of the transmitted signal is selected as a function of the multiplication factors.