biquad~
Two-pole, two-zero filter
Description
Two-pole, two-zero filter
biquad~ implements a two-pole, two-zero filter using the following equation:
y[n] = a0 * x[n] + a1 * x[n-1] + a2 * x[n-2] - b1 * y[n-1] - b2 * y[n-2]
You can specify the coefficients a0, a1, a2, b1, and b2 as signals or floats (if you make the filter explode by making the b coefficients too high, you can recover (after lowering them) with the clear message, or by turning the audio on and off).
Arguments
a0 [auto]
Set the value for the a0 filter coefficient. If a signal is connected to the second inlet, the coefficient supplied as an argument is ignored.
a1 [auto]
Set the value for the a1 filter coefficient. If a signal is connected to the third inlet, the coefficient supplied as an argument is ignored.
a2 [auto]
Set the value for the a2 filter coefficient. If a signal is connected to the fourth inlet, the coefficient supplied as an argument is ignored.
b1 [auto]
Set the value for the b1 filter coefficient. If a signal is connected to the fifth inlet, the coefficient supplied as an argument is ignored.
b2 [auto]
Set the value for the b2 filter coefficient. If a signal is connected to the sixth inlet, the coefficient supplied as an argument is ignored.
Inlets
x [auto]
The signal to be filtered.
a0 [auto]
Set the value for the a0 filter coefficient. If a signal is connected to the second inlet, the coefficient supplied as an argument is ignored.
a1 [auto]
Set the value for the a1 filter coefficient. If a signal is connected to the third inlet, the coefficient supplied as an argument is ignored.
a2 [auto]
Set the value for the a2 filter coefficient. If a signal is connected to the fourth inlet, the coefficient supplied as an argument is ignored.
b1 [auto]
Set the value for the b1 filter coefficient. If a signal is connected to the fifth inlet, the coefficient supplied as an argument is ignored.
b2 [auto]
Set the value for the b2 filter coefficient. If a signal is connected to the sixth inlet, the coefficient supplied as an argument is ignored.
Outlets
out1 [signal]
The filtered signal.
Dynamic Attributes
These attributes can be modified in the code during execution using the set object
a0 [auto]
Set the value for the a0 filter coefficient. If a signal is connected to the second inlet, the coefficient supplied as an argument is ignored.
a1 [auto]
Set the value for the a1 filter coefficient. If a signal is connected to the third inlet, the coefficient supplied as an argument is ignored.
a2 [auto]
Set the value for the a2 filter coefficient. If a signal is connected to the fourth inlet, the coefficient supplied as an argument is ignored.
b1 [auto]
Set the value for the b1 filter coefficient. If a signal is connected to the fifth inlet, the coefficient supplied as an argument is ignored.
b2 [auto]
Set the value for the b2 filter coefficient. If a signal is connected to the sixth inlet, the coefficient supplied as an argument is ignored.
reset [bang] (default: 0)
Banging this attribute will reset the object to its default state.
x [auto]
The signal to be filtered.
See Also
| Name | Description |
|---|---|
| biquad~ | |
| filtercoeff~ | Signal-rate filter coefficient generator |
| allpass~ | Apply an allpass filter effect |
| comb~ | Apply a comb filter effect |
| cross~ | Third-order crossover filter |
| lores~ | Resonant lowpass filter |
| reson~ | Resonant bandpass filter |
| svf~ | State-variable filter with simultaneous outputs |
| swanramp~ | Switch-and-ramp click compensation |