ABox Help Basics Objects Signals Tutorials
ButtonKnob
OscillatorNoise
Math OperatorFunction 1
ADSRSample and Hold
Pitch QuantizerRandom Sequence
Math KnobDelta
DelayDivider
DamperDecay
IIR z PlaneIIR Block
SplitterMixer
MultiplexerDemultiplexer
Wave OutWave In
OscilloscopeSpectrum Analyzer
LabelFile
IIR z Plane

The IIR z plane allows mouse control of the pole and zero for a biquad filter. The graphic shows the z plane with a pole (X) and zero (O) control.


Pins:
Xinputrequired to operate
Aattenuationinputoptional, default = 1.0
YOutput
Controls:
O Zero control
X Pole control
Keyboard and Context menu:
deldelete the object
Default State:
as shown
internal values reset to zero at play start.
Notes:
The graphic shows the z plane with the unit circle. 0Hz is at 3 o'clock, 11025 Hz is at noon, and 22050 Hz at 9 o'clock. The unit circle shows where the filter will break into oscillation.
Moving the pole or zero control will change the filter coefficients. The locations are interpolated accross sample frames.
To prevent saturation, this object clips the output at ±1.0. Use attenuation to prevent this.