Pulse or digital communications – Receivers – Amplitude modulation
Reexamination Certificate
2008-03-04
2008-03-04
Lugo, David B. (Department: 2611)
Pulse or digital communications
Receivers
Amplitude modulation
C375S268000, C375S300000
Reexamination Certificate
active
07340012
ABSTRACT:
A method for detecting encoded digital data from a substantially sinusoidal waveform, the encoded digital data having one of a first value and a second value at selected phase angles θncomprises generating the waveform having an amplitude Y defined by a first function at phase angles lying outside of regions having a range Δθ beginning at each phase angle θn, said first function being Y=sin θ; generating the waveform having an amplitude Y defined by the first function at phase angles lying inside the regions having a range of Δθ beginning at each phase angle θnwhere 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 Δθ associated with each phase angle θnwhere data of the second value is to be encoded, the second function being different from Y=sin θ, the detection including deriving sync pulses from minima and maxima of the substantially sinusoidal waveform to frame data words.
REFERENCES:
patent: 6574284 (2003-06-01), Jordan
patent: 6621426 (2003-09-01), van Nguyen
patent: 7046741 (2006-05-01), Brown et al.
Harold R. Walker, “Understanding Ultra Narrowband Modulation”,Microwaves&RF, pp. 53-54, 56, 58, 60-61, Dec. 2003.
Brown Forrest J.
D'Alessandro Kenneth
Kunzel Ronald E.
Loar David W.
Data Flow Technologies, Inc.
Lugo David B.
Sierra Patent Group Ltd.
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