Digital Filters, Demodulationmoller.physics.berkeley.edu/~yury/Phys250/filters.pdf · More FIR Filters 5-tap “Gaussian” FIR filter. 11/16/2006 YGK, Phys250 Ideal Low-Pass FIR
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Digital Filters,Demodulation
Nov. 16, 21
11/16/2006 YGK, Phys250
FIR filters
11/16/2006 YGK, Phys250
Box-car Filter Response
11/16/2006 YGK, Phys250
Time-Domain Signal After Filteringfsignal=fs/32
fsignal=3fs/32
11/16/2006 YGK, Phys250
Frequency-Domain Response
11/16/2006 YGK, Phys250
More FIR Filters
5-tap “Gaussian” FIR filter
11/16/2006 YGK, Phys250
Ideal Low-Pass FIR FilterFrequency response
Time-domain coefficients
11/16/2006 YGK, Phys250
Convoluted Low-Pass Filter
11/16/2006 YGK, Phys250
Example: Blackman Window(approximates Gauss)
Magnitude of time-domain response
dB
11/16/2006 YGK, Phys250
More (Tunable) Filters
(c.f. hardware filters)
11/16/2006 YGK, Phys250
More Tunable Filters
11/16/2006 YGK, Phys250
Bandpass Filter
11/16/2006 YGK, Phys250
Highpass Filter
11/16/2006 YGK, Phys250
Phase Response in FIR FiltersLinear phase shift in passband: constant group delay (no spectral distortions): good !