index :: flt

flt.freqz~

compute the frequency response of a digital filter

available since version: 0.9

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information

Given the M-order numerator b and N-order denominator a of a digital filter, compute its frequency response: H(eʲʷ) = B(eʲʷ)/A(eʲʷ) = (b⁰+b¹e⁻ʲʷ+…+bᴹe⁻ʲʷᴹ)/(1+a¹e⁻ʲʷ+…+aᴺe⁻ʲʷᴺ)

properties:

• @a Get/set denominator (poles) coefficients. 'a0' always implicitly set to 1, property value set a1…an coefficients
  type: list
  

• @b Get/set numerator (zeros) coefficients
  type: list
  default: 1
  

• @sr Get/set normalize using current samplerate
  type: bool
  default: 0
  

• @db Get/set output amp response in db scale
  type: bool
  default: 0
  

inlets:

• input frequency in radians [0, π] or in hertz [0 sr/2] if @sr property is true
  type: audio

outlets:

• amplitude frequency response signal
  type: audio
• phase frequency response signal
  type: audio

keywords:

filter calc bode frequence response phase plot

Authors: Serge Poltavsky

License: GPL3 or later