Single and multiple sinewave modulation and demodulation...

H - Electricity – 04 – L

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H04L 27/02 (2006.01) H03C 1/00 (2006.01) H04L 27/28 (2006.01)

Patent

CA 2564081

A method for detecting encoded digital data from a substantially sinusoidal waveform (10), the encoded digital data having one of a first value and a second value at selected phase angles .theta. n comprises generating the waveform having an amplitude Y defined by a first function at phase angles lying outside of regions having a range .DELTA..theta. beginning at each phase angle .theta. n, said first function being Y = sin.theta.; generating the waveform having an amplitude Y defined by the first function at phase angles lying inside the regions having a range of .DELTA..theta.beginning at each phase angle .theta. n where data of the first value is to be encoded; and generating the waveform having an amplitude Y defined by a second function at phase angles lying inside the regions having a range of .DELTA..theta. associated with each phase angle .theta. n where data of the second value is to be encoded, the second function being different from Y = sin.theta., the detection including deriving sync pulses (16) from minima and maxima of the substantially sinusoidal waveform (10) to frame data words.

L'invention concerne un procédé de détection de données numériques codées à partir d'une forme d'onde sensiblement sinusoïdale, ces données ayant une première ou seconde valeur aux angles de phase détectés <i : production de la forme d'onde d'amplitude Y définie par une première fonction aux angles de phase en dehors des zones à gamme <i

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