Methods and apparatus for separating desired signals from a mixed signal. A preferred method includes identifying the frequencies associated with the independent signals within the mixed signal and sampling the mixed signal once for each of the identified frequencies. Using the identified frequencies, a set of constant coefficients is determined and applied to the samples to separate at least one of the independent signals from the mixed signal. The other independent signals may then be suppressed. A signal processing system is also supplied that includes memory and a circuit. The memory stores samples of the mixed signal for the circuit to process. The circuit identifies the frequencies of the independent signals, determines a set of coefficients, and applies the coefficients to the mixed signal. Thus, the system separates a desired signal from the mixed signal.