Native IIR notch (module 20); previously wrapped the signal package's
iirnotch / filtfilt. Falls back to a stop with NotYetPorted if
signal is unavailable.
Usage
morie_dsp_notch(x, freq, fs, q = 30)
Arguments
- x
Numeric vector.
- freq
Notch centre frequency (Hz).
- fs
Sampling frequency (Hz).
- q
Quality factor. Default 30.
Value
Filtered vector, length(x).
References
Rangayyan & Krishnan (2015), Ch. 3, sec. 3.7.
Examples
fs <- 1000
t <- seq(0, (fs - 1) / fs, length.out = fs)
x <- sin(2 * pi * 10 * t) + 0.5 * sin(2 * pi * 60 * t)
y <- morie_dsp_notch(x, freq = 60, fs = fs)
length(y)
#> [1] 1000
