sinusoid: Create Sinusoids

In phonTools: Tools for Phonetic and Acoustic Analyses

Create Sinusoids

Description

Create and display one or more sinusoids.

Usage

sinusoid (freqs, amps = rep(1, length(freqs)), dur = 50, 
phases = rep(0, length(freqs)), fs = 10000, sum = FALSE, 
show = FALSE, colors = NULL)

Arguments

freqs	A vector of frequencies, one for each desired sinusoid.
amps	A vector of peak amplitudes, one for each desired sinusoid.
dur	The desired duration of the sinusoids, in milliseconds.
phases	A vector of initial phases, one for each desired sinusoid, expressed in radians.
fs	The desired sampling frequency of the sinusoids.
sum	If TRUE, the sum the generated sinusoids is also found.
show	If TRUE, the generated sinusoids are plotted. If sum is TRUE, a second plot is created to display the sum of the sinusoids.
colors	An optional vector of colors used to plot the individual sinusoids. If the number of colors given is less than the number of frequencies specified, the colors are repeated.

Details

A number of sinusoids are generated, and optionally plotted and/or returned. The number of frequencies specified must equal the number of amplitudes and initial phases.

Value

A dataframe with the following columns:

time	The time, in milliseconds, at which is sample is taken.
waveN	A series of columns, each indicating the amplitude of wave N at a given time.
sum	A column indicating the sum of all of the sinusoids.

Author(s)

Santiago Barreda <[e-mail]>

Examples

## several waves, and the sum
#sum = sinusoid (freqs = c(100,200,300), amps = c(1,3,2), 
#sum = TRUE, show = TRUE)

## no sum, different phase shifts
#nosum = sinusoid (freqs = c(100,200,300), amps = c(1,3,2), 
#phases = c(pi/2, 0, pi/4), sum = FALSE)

phonTools documentation built on Nov. 21, 2023, 1:07 a.m.