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Method of removing noise and interference from signal using peak picking

Patent image
NSA

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.

Inventors: 
Nelson, Douglas J.
Patent Number: 
Technical domain: 
IT and Software
FIle Date: 
2005-06-09
Grant Date: 
2009-02-17
Grant time: 
1,349 days
Grant time percentile rank: 
24
Claim count percentile rank: 
4
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY