Data Acquisition Flashcards
1
Q
what does it mean for h(t) to be bandwidth limited
A
the FT of h(t) is non-zero over a finite range of frequencies
2
Q
if h(t) is bandwidth limited, there exists a critical frequency fc such that
A
H(f)=0 for all |f| > or = fc
3
Q
if sampling rate is much higher than f then
A
the signal is reasonably represented
4
Q
Nyquist-Shannon sampling theorem
A
If a band limited signal of maximum frequency fc is periodically sampled every T seconds where T<1\2fc or f>2fc
then these samples can be used to reconstruct the original signal
without any distortion
5
Q
alias effect
A
reconstructing the wrong apparent frequency from samples
