Demodulators – Frequency modulation demodulator – Having specific distortion – noise or other interference...
Patent
1994-12-19
1996-02-27
Grimm, Siegfried H.
Demodulators
Frequency modulation demodulator
Having specific distortion, noise or other interference...
329341, 455214, 375328, H03D 300
Patent
active
054952042
ABSTRACT:
Digital FM demodulator and method in which zero-crossings of a frequency modulated input signal are detected, a binary pulse is provided for each of the zero-crossings, and the binary pulse stream is filtered digitally to provide enhanced resolution of the incremental phase (frequency) of the input signal over a period which is asynchronous with the input signal. In the disclosed embodiments, the digital filtering is done with comb decimation filters, with a higher order filter being employed where greater resolution is desired.
REFERENCES:
patent: 3571712 (1971-03-01), Hellwarth
patent: 3636454 (1972-01-01), Pasternack et al.
patent: 4541105 (1985-09-01), Lee et al.
BEI Electronics, Inc.
Grimm Siegfried H.
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