Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ
îðèãèíàëüíîãî äîêóìåíòà
: http://www.mrao.cam.ac.uk/~rachael/systems/Summary2.html
Äàòà èçìåíåíèÿ: Tue Feb 10 15:01:56 2004 Äàòà èíäåêñèðîâàíèÿ: Tue Oct 2 04:55:00 2012 Êîäèðîâêà: Ïîèñêîâûå ñëîâà: spacecraft |
1. Sampling is multiplication by a comb of delta functions:
á á
2. Fourier transformá á á
á á
3. Alternative representation of FT:
á á
á á á á á á á á possibility of aliasing.
4.
Finite
length sequence á convolution with sinc function.
5.
Windowingá á multiply sequence in order to achieve balance
between width and sidelobes of convolving function
6.
Leakage á sidelobes of window function may affect
appearance of samples in the frequency domain.
7.
Circular convolution á sampling the function in the frequency domain á
á periodicity in the time domain.
8. Filtering of sampled data in frequency domain is convolution in the time domain over a periodic function.
9. Stability determined as for continuous systems: stable if no poles in Right Half-Plane.