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#' Contains functions related to electronic filters.
#'
#' @references
#' \url{http://en.wikipedia.org/wiki/Electronic_filter}
#'
#' @author Nathan Campos \email{nathanpc@@dreamintech.net}
#' Calculates the cutoff frequency of a RC filter.
#'
#' @references
#' \url{http://en.wikipedia.org/wiki/RC_circuit}
#' \url{http://en.wikipedia.org/wiki/Low-pass_filter}
#' \url{http://en.wikipedia.org/wiki/High-pass_filter}
#'
#' @param r Resistance (Ohms).
#' @param c Capacitance (Farads).
#' @return Cutoff frequency (Hertz).
filter.rc <- function (r, c) {
return(1 / (2 * pi * r * c))
}
#' Calculates resistor value for a RC filter.
#'
#' @param f Frequency (Hertz).
#' @param c Capacitance (Farads).
#' @return Resistance (Ohms).
filter.rc.r <- function (f, c) {
return(1 / (2 * pi * c * f))
}
#' Calculates capacitor value for a RC filter.
#'
#' @param f Frequency (Hertz).
#' @param r Resistance (Ohms).
#' @return Capacitance (Farads).
filter.rc.c <- function (f, r) {
return(1 / (2 * pi * r * f))
}
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