Method to demodulate a signal component from a sampled input signal and field bus device
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United States of America Patent
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Feb 20, 2018
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Jun 3, 2016
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Jun 3, 2015
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Abstract
A method to determine the magnitude MA of a signal component with frequency ωA from a set of N digital samples of an input signal acquired at a sampling rate R, said input signal having a discrete spectral representation having n bins with frequencies ω1, . . . , ωn and corresponding magnitudes M1, . . . , Mn, the spectral representation being derivable from the input signal using a transform, involving choosing an extraction bin with index kε[1, . . . , n] and frequency ωk≠ωA from the spectral representation; determining a magnitude Mk of this extraction bin; determining an allocation factor indicating a portion Mks of a sinusoidal signal with frequency ωA and unity magnitude that is allocated to the extraction bin when the transform is applied to the sinusoidal signal to generate a spectral representation out of the sinusoidal signal; and determining the magnitude MA of the signal component from the magnitude Mk of the bin in combination with the factor.
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