DH_BiquadFilter

Multiple-mode 12 dB / octave filter
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DH_BiquadFilter Ranking & Summary

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  • Rating:
  • License:
  • Freeware
  • Publisher Name:
  • David Haupt
  • Operating Systems:
  • Windows All
  • File Size:
  • 81 KB

DH_BiquadFilter Tags


DH_BiquadFilter Description

The DH_BiquadFilter SynthEdit module was developed to be a multiple-mode 12 dB / octave filter. Inputs: Input - audio signal Center Freq - the filter's center or cutoff frequency, either directly in Hz, OR in volts, using SE's 1 volt/octave scale, as selected by the Input Mode parameter. Bandwidth - the width of the filter's pass band, either directly in octaves, OR using the SE voltage scale, as selected by the Input Mode parameter. Note: In voltage mode, this input is inversely proportional to the bandwidth, consistent with other SE filters. Gain - Used only with the EQ Peak, Low Shelf and High Shelf modes. Controls the amount of boost or cut applied. Range: -30 to +30 dB, OR 0 - 10 volts, as selected by the input mode parameter. Filter Type - The following filter modes are available: LP - Low pass filter HP - High pass filter BP - Band pass filter Notch - Notch filter EQ Peak - Boosts selected frequency band by amount of gain control Low Shelf - Boosts low frequencies by amount of gain control High Shelf - Boosts high frequencies by amount of gain control Custom - Allows direct entry of filter coefficients. For advanced users. a0, a1, a2, b1, b2 - (for Custom mode only) Coefficients for the biquad filter's difference equation: y = a0*x + a1*x + a2*x - b1* - b2* Outputs: Output - the filtered signal Parameters: (right-click Properties) Input Mode - Selects between using actual Hz, octave, and dB units for the frequency, bandwidth and gain inputs, or using the standard SE 0 - 10 volt input range for each of these. Quality - Selects between Economy mode, which saves CPU, and Fast Modulation mode, which allows the center frequency or bandwidth to be modulated at audio frequencies.


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