Pulse or digital communications – Transmitters – Amplitude modulation
Reexamination Certificate
2007-11-20
2007-11-20
Lugo, David B. (Department: 2611)
Pulse or digital communications
Transmitters
Amplitude modulation
C375S268000
Reexamination Certificate
active
11383439
ABSTRACT:
A method for generating a substantially sinusoidal waveform containing 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.
REFERENCES:
patent: 6574284 (2003-06-01), Jordan
patent: 6621426 (2003-09-01), van Nguyen
patent: 7046741 (2006-05-01), Brown et al.
patent: 2005/0286645 (2005-12-01), D'Alessandro et al.
Harold R. Walker, “Understanding Ultra Narrowband Modulation”, Microwaves and RF, Dec. 2003, pp. 53-54, 56, 58, 60-61.
Brown Forrest J.
D'Alessandro Kenneth
Kunzel Ronald E.
Loar David W.
Pownell Charles V.
Data Flow Technologies, Inc.
Lugo David B.
Sierra Patent Group Ltd.
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