Digital signal demodulators with single-sideband

Digital methods for processing signals constantly become more common in communications because of low cost, reliability and stability. A simple single-sideband demodulator for such use is described. Demodulation processes are analyzed in order to determine the most effective high-speed algorithms for its operation, without using multiplication operations in data processing. Theoretical presumptions and a series of three algorithms are summarized. The third selects discretization frequency, changes as needed for operation, obtains parallel values for successive operations with cosine or sine components for precise or linear-interpolated data, and obtains successive digital values by alternative selection from the previous successions. Use has shown this algorithm to be more precise as well as more rapid than those previously employed. Design of the actual digital device is diagramed and described.