| Waveforms {tuneR} | R Documentation |
Create a Wave object of special waveform such as
silcence, (white/pink) noise, sawtooth, sine, and square.
noise(kind = c("white", "pink"), duration = samp.rate,
samp.rate = 44100, bit = 1, stereo = FALSE,
xunit = c("samples", "time"), ...)
sawtooth(freq, duration = samp.rate, from = 0, samp.rate = 44100, bit = 1,
stereo = FALSE, xunit = c("samples", "time"), reverse = FALSE, ...)
silence(duration = samp.rate, from = 0, samp.rate = 44100, bit = 1,
stereo = FALSE, xunit = c("samples", "time"), ...)
sine(freq, duration = samp.rate, from = 0, samp.rate = 44100, bit = 1,
stereo = FALSE, xunit = c("samples", "time"), ...)
square(freq, duration = samp.rate, from = 0, samp.rate = 44100, bit = 1,
stereo = FALSE, xunit = c("samples", "time"), up = 0.5, ...)
kind |
The kind of noise, either “white” or “pink” (the latter is not dB adjusted (!) but linear decreasing on a log-log scale). |
freq |
The frequency (in Hertz) to be generated. |
duration |
Duration of the Wave in xunit. |
from |
Starting value of the Wave in xunit. |
samp.rate |
Sampling rate of the Wave. |
bit |
Resolution of the Wave and rescaling unit. This may be1 (default) for rescaling to real values in [-1,1],8 (i.e. 8-bit) for rescaling to integers in [0, 254],16 (i.e. 16-bit) for rescaling to integers in [-32767, 32767],24 (i.e. 24-bit) for rescaling to integers in [-8388607, 8388607],32 (i.e. 32-bit) for rescaling to integers in [-2147483647, 2147483647], and0 for not rescaling at all. These numbers are internally passed to normalize.
The Wave slot bit will be set to 8, if bit=8, and to 16 otherwise. |
stereo |
Logical, if TRUE, a stereo sample will be generated.
The right channel is identical to the left one for sawtooth, silence,
sine, and square. For noise, both channel are independent. |
xunit |
Character indicating which units are used
(both in arguments duration and from).
If xunit = "time", the unit is time in seconds, otherwise the number of samples. |
reverse |
Logical, if TRUE, the waveform will be mirrored vertically. |
up |
A number between 0 and 1 giving the percentage of the waveform at max value (= 1 - percentage of min value). |
... |
Further arguments to be passed to Wave through the internal function postWaveform. |
A Wave object.
Uwe Ligges, ligges@statistik.uni-dortmund.de, partly based on code from Matthias Heymann's former package ‘sound’, code for pink noise adapted and simplified from C code of Steve Moshier.
Wobj <- sine(440, bit = 16, duration = 1000) Wobj2 <- noise(bit = 16, duration = 1000) plot(Wobj) plot(Wobj2)