Method of removing noise and interference from signal using...

Pulse or digital communications – Testing – Signal noise

Reexamination Certificate

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Details

C375S260000, C381S083000, C600S507000, C704S206000

Reexamination Certificate

active

07492814

ABSTRACT:
Removing noise and interference from a signal by calculating a joint time-frequency domain of the signal, estimating instantaneous frequencies of the joint time-frequency domain, modifying each estimated instantaneous frequency, if necessary, to correspond to a frequency of the joint time-frequency domain to which it most closely compares, redistributing elements within the joint time-frequency domain according to the modified instantaneous frequencies, computing a magnitude for each element in the redistributed joint time-frequency domain, plotting the results, identifying peak values, eliminating from the redistributed joint time-frequency domain elements that do not correspond to the peak values, identifying noise and interference in the peak values, eliminating the noise and the interference from the redistributed joint time-frequency domain elements, and recovering a signal devoid of noise and interference from the modified redistributed joint time-frequency domain.

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patent: 2002/0173276 (2002-11-01), Tschirk
Dogulas J. Nelson, Cross-spectral methods for processing speech, Nov. 2001, J. Acosut. Soc. Am. 110 (5), Pt 1.

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