tuneR (version 0.2-6)

Waveforms: Create Wave Objects of Special Waveforms

Description

Create a Wave object of special waveform such as silcence, (white/pink) noise, sawtooth, sine, and square.

Usage

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, ...)

Arguments

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 be 1 (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

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 ar

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.

Value

• A Wave object.

concept

• Wave
• sound
• waveform
• silcence
• sample

See Also

Wave, normalize, noSilence

Examples

Wobj <- sine(440, bit = 16, duration = 1000)
Wobj2 <- noise(bit = 16, duration = 1000)
plot(Wobj)
plot(Wobj2)