Pulse or digital communications – Systems using alternating or pulsating current
Reexamination Certificate
2006-09-12
2006-09-12
Ha, Dac (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Reexamination Certificate
active
07106801
ABSTRACT:
A general method for extracting an electromagnetic or other wave-propagated signal of a desired source from the overall received waveform containing the sum of signals from a multitude of such sources, independently of signal contents and modulation. The method comprises the steps of first expanding the spectrum of the received sum of signals in proportion to their source distances so as to spectrally isolate the signal from the desired source, selecting the isolated signal spectrum using a bandpass filter, and finally, spectrally compressing the selected signal back to its original band of frequencies. The distance dependent expansion is performed by scanning the phase gradient of the signal spectrum. Related method for computing the spread of source distances by measuring low and high frequency bounds of the expanded sum of signals or subbands, or by plotting the expanded sum of signals or subbands on a graph.
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Ha Dac
Joseph Jaison
Ostrager Chong & Flaherty & Broitman P.C.
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