Northern Telecom Limited

Geoffrey B Brown

David William Park

A method of demodulating an oversampled digitised analogue signal F(t) wherein n samples per bit of the digitised signal represent the instantaneous frequency and/or phase of the signal. The method includes the steps of selecting a sequence of bits containing bit value transitions, determining the magnitude of F(t) within the sequence so that all the extrema are maxima (or minima), whereby the maxima (or minima) of .vertline.F(t).vertline. provide a defined timing position in relation to the bits of the sequence. The value of .vertline.F(t).vertline. over a succession of said bits is averaged and a timing control signal is derived therefrom for demodulation of the digitised analogue signal.

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Bishops Stortford, United Kingdom

Geoffrey B Brown