decimate: Decimate with 'FIR' or 'IIR' filter

In ravetools: Signal and Image Processing Toolbox for Analyzing Intracranial Electroencephalography Data

Decimate with 'FIR' or 'IIR' filter

Description

Decimate with 'FIR' or 'IIR' filter

Usage

decimate(x, q, n = if (ftype == "iir") 8 else 30, ftype = "fir")

Arguments

x	signal to be decimated
q	integer factor to down-sample by
n	filter order used in the down-sampling; default is 30 if ftype='fir', or 8 if ftype='iir'
ftype	filter type, choices are 'fir' (default) and 'iir'

Details

This function is migrated from gsignal package, but with padding and indexing fixed. The results agree with 'Matlab'.

Value

Decimated signal

Examples

x <- 1:100
y <- decimate(x, 2, ftype = "fir")
y

# compare with signal package
z <- gsignal::decimate(x, 2, ftype = "fir")

# Compare decimated results
plot(x, type = 'l')
points(seq(1,100, 2), y, col = "green")
points(seq(1,100, 2), z, col = "red")

ravetools documentation built on Sept. 11, 2024, 9:06 p.m.