Manchester decoder

Abstract

A decoder for Manchester encoded data. Each mid-bit transition of the Manchester encoded data is detected and used to activate a counter which counts pulses from a local clock having a pulse rate eight times the data bit rate. The sixth pulse thus occurs at a point one-fourth of a data bit interval after the start of the next data bit interval. At that point the Manchester encoded data is sampled. Since the clock utilized to produce the Manchester encoded data is at a logic level zero at the sampling time, the sampled logic level of the Manchester data is the same as the logic level of the original data. The sampled logic level is used to recreate the original data level, and so the recreated pulse waveform is of the same wave shape as the original data pulse waveform but lags the original by one-fourth a data bit interval.

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