Method of removing signal interference from sampled data and apparatus for effecting the same
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United States of America Patent
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Feb 26, 2002
Grant Date -
N/A
app pub date -
Nov 12, 1999
filing date -
Nov 12, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus that separates an interference signal from a sampled input signal is provided. The method and apparatus approximates the frequency, phase and amplitude of the interference signal through an optional reverse direction learning process and then separates that portion of the interference signal overlapped or combined with a sample of the input signal. The signals can be separated by generating a second signal of suitable approximation in frequency, amplitude and phase with the interference signal and then subtracting a sample of that signal from the sampled input signal. The second signal frequency and amplitude/phase may be derived through an iterative process that measures the amplitude of the interference signal and the phase angle between the second signal and an output signal and then adjusts the frequency and amplitude of the second signal based, in part, on these measurements until the second signal substantially matches the interference signal. If desired, the processing method and apparatus may be applied to a digitized sampled waveforms and can operate at any sample frequency.
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