fir1 {signal} | R Documentation |
FIR filter coefficients for a filter with the given order and frequency cutoff.
fir1(n, w, type = c("low", "high", "stop", "pass", "DC-0", "DC-1"), window = hamming(n + 1), scale = TRUE)
n |
order of the filter (1 less than the length of the filter) |
w |
band edges, strictly increasing vector in the range [0, 1], where 1 is the Nyquist frequency. A scalar for highpass or lowpass filters, a vector pair for bandpass or bandstop, or a vector for an alternating pass/stop filter. |
type |
character specifying filter type, one of "low" for a low-pass filter,
"high" for a high-pass filter, "stop" for a stop-band (band-reject)
filter, "pass" for a pass-band filter, "DC-0" for a
bandpass as the first band of a multiband filter, or "DC-1" for a
bandstop as the first band of a multiband filter. |
window |
smoothing window. The returned filter is the same shape as the smoothing window. |
scale |
whether to normalize or not. Use TRUE or 'scale' to set
the magnitude of the center of the first passband to 1, and
FALSE or 'noscale' to not normalize. |
The FIR filter coefficients, an array of length(n+1), of class Ma
.
Original Octave version by Paul Kienzle, pkienzle@user.sf.net. Conversion to R by Tom Short.
http://en.wikipedia.org/wiki/Fir_filter
Octave Forge http://octave.sf.net
freqz(fir1(40,0.3)) freqz(fir1(10,c(0.3, .5), "stop")) freqz(fir1(10,c(0.3, .5), "pass"))