Demodulators – Frequency modulation demodulator – Input signal converted to and processed in pulse form
Patent
1998-11-19
2000-02-29
Mis, David
Demodulators
Frequency modulation demodulator
Input signal converted to and processed in pulse form
329300, 375334, 455214, 455337, H03D 300, H03K 906, H04L 2714
Patent
active
060314184
ABSTRACT:
A method for demodulating digital frequency modulation (FM) signals is disclosed. A group of complex-valued discrete-time FM signal samples is initially received. A corresponding first complex product for each of the complex-valued discrete-time FM signal samples is computed, and a corresponding second complex product for each of the first complex values of the complex-valued discrete-time FM signal samples is computed. Subsequently, an inverse tangent of the second complex products are computed to yield an angle for each of the second complex values, wherein each of the angles represents a second-order difference of a phase of the complex-valued discrete-time FM signal samples. Finally, a digital integration is performed to obtain a first-order difference of the phase of the complex-valued discrete-time FM signal samples.
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Cogan Robert P.
Dillon Andrew J.
Lockheed Martin Corporation
Mis David
Ng Antony P.
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