index :: flt

flt.bpf12~

Two pole band-pass butterworth filter

available since version: 0.1

---

information

Band-pass filter passes frequencies within a certain range and rejects frequencies outside that range. Butterworth filter is a type of filter designed to have a frequency response as flat as possible in the passband.

arguments:

• FREQ center frequency
  type: float
  units: Hz
  

• Q quality factory: @freq/BANDWIDTH
  type: float
  

methods:

• reset reset filter state
  

properties:

• @freq Get/set center frequency
  type: float
  units: Hz
  range: 20..20000
  default: 1000
  

• @q Get/set quality factor: @freq/BANDWIDTH
  type: float
  range: 0.01..100
  default: 2
  

• @active Get/set on/off dsp processing
  type: bool
  default: 1
  

• @osc (initonly) Get/set OSC server name to listen
  type: symbol
  

• @id (initonly) Get/set OSC address id. If specified, bind all properties to /ID/flt_bpf12/PROP_NAME osc address, if empty bind to /flt_bpf12/PROP_NAME.
  type: symbol
  

inlets:

• input signal
  type: audio
• set frequency
  type: control
• set Q-factor
  type: control

outlets:

• filtered signal
  type: audio

keywords:

filter biquad bpf

See also: [flt.bpf24~] [flt.c_bpf~]

Authors: Alex Nadzharov, Serge Poltavsky

License: GPL3 or later