cheb1ord | R Documentation |
Compute Chebyshev type-I filter order and cutoff for the desired response characteristics.
cheb1ord(Wp, Ws, Rp, Rs, plane = c("z", "s"))
Wp , Ws |
pass-band and stop-band edges. For a low-pass or high-pass
filter, |
Rp |
allowable decibels of ripple in the pass band. |
Rs |
minimum attenuation in the stop band in dB. |
plane |
"z" for a digital filter or "s" for an analog filter. |
A list of class 'FilterSpecs'
with the following list
elements:
filter order
cutoff frequency
filter type, normally one of "low"
, "high"
,
"stop"
, or "pass"
.
Paul Kienzle, Laurent S. Mazet, Charles Praplan.
Conversion to R by Tom Short, adapted by Geert van Boxtel,
G.J.M.vanBoxtel@gmail.com.
cheby1
## low-pass 30 Hz filter
fs <- 128
spec <- cheb1ord(30/(fs/2), 40/(fs/2), 0.5, 40)
cf <- cheby1(spec)
freqz(cf, fs = fs)
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