Fluctuations Based Digital Signal Processor Including Phase Variations
Patent, Filed 31 Dec 96, patented 24 Mar 98
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A scheme for filtering noise from a signal, in which the noise fluctuates significantly in phase. The signal is sampled to produce N members of a time series and the phase of each signal extracted in the form of a magnitude and a phaser, i.e., for a time series X1e1itheta,X2e2itheta,...,XNeNitheta, where Xn is the magnitude of the nth member of the N time samples, and eNitheta the phase for the nth sample. The phasers are added to form a complex value S such that S Summation from N-1 to N of Reeithetan iImeithetan. Phase noise which fluctuates strongly will tend cancel itself in the sum S, whereas phase resulting from a stable signal will tend to reinforce. Thus the scalar S will be relatively large in the presence of stable tonals, and small in the presence of noise along, making it an effective signal filter.
- Radiofrequency Wave Propagation