Two-pole, two-zero filter
|filter-parameters (5 floats)||list||opt||Up to five numbers, to set initial values for the coefficients a0, a1, a2, b1, and b2. If a signal is connected to a given inlet, the coefficient supplied as an argument for that inlet is ignored.|
||The coefficients in inlets 2 to 6 may be specified by ainstead of a signal. If a signal is also connected to the inlet, the is ignored.|
|list||filter-coefficients (5 floats) [list]
||The five coefficients can be provided as ain the left inlet. The first number in the is coefficient a0, the next is a1, and so on. If a signal is connected to a given inlet, the coefficient supplied in the for that inlet is ignored.|
|clear||Clears the biquad~ object's memory of previous inputs and outputs, resetting xn-1, xn-2, yn-1, and yn-2 to 0.|
|signal|| In left inlet: Signal to be filtered. The filter mixes the current input sample with the two previous input samples and the two previous output samples according to the formula:
yn = a0xn + a1xn-1 + a2xn-2 - b1yn-1 - b2yn-2.
In 2nd inlet: Amplitude coefficient a0, for scaling the amount of the current input to be passed directly to the output.
In 3rd inlet: Amplitude coefficient a1, for scaling the amount of the previous input sample to be added to the output.
In 4th inlet: Amplitude coefficient a2, for scaling the amount of input sample n-2 to be added to the output.
In 5th inlet: Amplitude coefficient b1, for scaling the amount of the previous output sample to be added to the current output.
In right inlet: Amplitude coefficient b2, for scaling the amount of output sample n-2 to be added to the current output. .
|stoke||filter coefficient values [list]
||The word, followed by a list that specifies a set of filter coefficient values, will preload the filter so that it starts in a given initial state, allowing the filter to be used for purposes such as a ringing oscillator.|
|Toggles the smoothing of filter coeffient changes. .|
|buffir~||buffer-based FIR filter|
|cascade~||Cascaded series of biquad filters|
|filtergraph~||Graphical filter editor|
|lores~||Resonant lowpass filter|
|onepole~||Single-pole lowpass filter|
|reson~||Resonant bandpass filter|
|teeth~||Comb filter with feedforward and feedback delay control|