Periodic wave elimination by negative feedback

Details Periodic wave elimination by negative feedback Periodic wave elimination by negative feedback

1982-02-10

1984-06-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

455296, H04J 1500

Patent

active

044569904

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.

REFERENCES:
patent: 4249260 (1981-02-01), Fisher et al.
patent: 4268914 (1981-05-01), Fisher et al.
patent: 4308614 (1981-12-01), Fisher et al.
Modulation Theory, by H. S. Black, New York, 1953, pp. 48, 57, 103.

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