Digital frequency modulation receiver with frequency variation signal and demodulation method used by the same
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United States of America Patent
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Nov 7, 2017
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app pub date -
Jul 28, 2016
filing date -
Mar 6, 2015
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Abstract
A digital frequency modulation receiver includes a phase capturer, an adder, a digital filter and a phase estimator. The phase estimator is used to generate a first phase value according to an input signal. The adder is coupled to the phase estimator for subtracting a second phase value from the first phase value to generate a phase difference. The digital filter is coupled to the adder for performing a filtering calculation with the phase difference so as to generate a frequency variation signal. The phase estimator is coupled to the digital filter and the adder so as to update the second phase value according to the frequency variation signal.
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