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Method of generating time-frequency signal representation preserving phase information

Patent image
NSA

A method of generating a time-frequency representation of a signal that preserves phase information by receiving the signal, 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 the elements within the joint time-frequency domain according to the estimated instantaneous frequencies as modified, computing a magnitude for each element in the joint time-frequency domain as redistributed, and plotting the results as the time-frequency representation of the signal.

Inventors: 
Nelson, Douglas J.; Smith, David Charles
Patent Number: 
Technical domain: 
IT and Software
FIle Date: 
2005-06-09
Grant Date: 
2008-11-25
Grant time: 
1,265 days
Grant time percentile rank: 
23
Claim count percentile rank: 
3
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
NATIONAL SECURITY AGENCY