Effective multifrequency receiver design

An experimental digital multifrequency receiver was designed and implemented to verify the hypothesis that aliasing techniques can be used to improve the performance-cost ratio of these systems. The receiver employs specific spectral analysis and digit decoding algorithms to take advantage of the aliasing fold-over in order to reject voice-simulated digits. An approximate 2:1 reduction in computational requirement is obtained. Rigorous tests were carried out to verify that computational benefits are not obtained at the expense of degraded performance.