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trapezoid~

Trapezoidal wavetable

Description

trapezoid~ is a trapezoidal wavetable with signal inputs to change ramp up/down phase position. The default lo/hi points are 0. and 1., but may be changed using the lo/hi messages.

Arguments

Name Type Opt Description
ramp-up and ramp-down float opt Two floating-point values can be used to specify the ramp up and ramp down values. The arguments 0. 0. produce a ramp waveform, and 0.5 0.5 produces a triangle waveform.

Messages

float trapezoidal-control [float]
 In left inlet: Any float or signal or an input signal progressing from 0 to 1 is used to scan the trapezoid~ object's wavetable. The output of a phasor~ or some other audio signal can be used to control trapezoid~ as an oscillator, treating the contents of the wavetable as a repeating waveform.

In middle inlet: The ramp up portion of the trapezoidal waveform, specified as a fraction of a cycle between 0 and 1.0. The default is .1.

In right inlet: The ramp up portion of the trapezoidal waveform, specified as a fraction of a cycle between 0 and 1.0. The default is 0.9.
hi maximum-value [float]
 In left inlet: The word hi, followed by an optional number, sets the maximum value of trapezoid~ for signal output. The default value is 1.0.
lo minimum-value [float]
 In left inlet: The word lo, followed by an optional number, sets the minimum value of trapezoid~ for signal output. The default value is 0.
signal In left inlet: Any float or signal or an input signal progressing from 0 to 1 is used to scan the trapezoid~ object's wavetable. The output of a phasor~ or some other audio signal can be used to control trapezoid~ as an oscillator, treating the contents of the wavetable as a repeating waveform.

In middle inlet: The ramp up portion of the trapezoidal waveform, specified as a fraction of a cycle between 0 and 1.0. The default is .1.

In right inlet: The ramp up portion of the trapezoidal waveform, specified as a fraction of a cycle between 0 and 1.0. The default is 0.9.

Information for box attributes common to all objects

Output

signal: A signal which corresponds to the value referenced by the trapezoid~ object's input signal. If the output of a phasor~ or some other audio signal is used to scan the trapezoid~ object, the output will be a periodic waveform.

Examples

trapezoid~ generates a trapezoidal waveform that lets you specify the phase points at which it changes direction

See Also

Name Description
buffer~ Store audio samples
cos~ Signal cosine function (0-1 range)
phasor~ Sawtooth wave generator
wave~ Variable size wavetable
MSP Tutorial 2: Adjustable Oscillator MSP Tutorial 2: Adjustable Oscillator
MSP Tutorial 3: Wavetable Oscillator MSP Tutorial 3: Wavetable Oscillator