Periodic wave elimination by negative feedback
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United States of America Patent
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-
Jun 26, 1984
Grant Date -
N/A
app pub date -
Feb 10, 1982
filing date -
Feb 10, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Means and method for substantially eliminating a selected periodic wave from a frequency band-limited combined wave containing other waves. The combined wave is sampled in a sampling gate, opened by short gating pulses with a frequency equal to the selected frequency divided by an integer, and greater than the Nyquist frequency for the combined wave, timed from the selected periodic waves. The samples are reconstructed in a filter with the pass-band equal to the frequency band of the combined wave. The direct-current component in the output of the sampling gate, due to any error in the timing of the instants, is used in a negative-feedback circuit to adjust the sampling instants so that the periodic wave is substantially completely eliminated.
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