Special purpose sine-wave sources are easily obtained using digital counting-decoder-filter methods with second-harmonic distortion less than 1%. Good frequency stability and reasonable variety in choice of output frequency results when the input clock signal is derived from a crystal oscillator through programmable divider chains. The resulting sine wave output would be suitable for applications such as the 90- and 150-Hz modulation frequencies of ILS transmitters, as well as other limited-range audio-frequency use.
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