Trilobite 1.2
User Guide


© Darwin Arts L.L.C., 2015










Biquad Filter Module




The Biquad Filter Module implements a subtractive synthesis six-coefficient digital IIR filter with input/output power balancing for some pole stability. It takes an input signal and several continuous real-time parameter values and produces a filtered output Signal. Available forms of the filter include: Lowpass, Highpass, Bandpass, Notch, and Allpass. For more information about IIR filter forms and configurations, see Robert Bristow-Johnson's excellent EQ Cookbook.

For a key to understanding the tables on this page, see the Module Types page.

Adding Input Ports

Adding input ports is not enabled for this module.

Static Parameters

#

Title

Type

Description

0

Filter Type

Choice

Has the options

  • Lowpass

  • Highpass

  • Bandpass

  • Notch

  • Allpass

Input Ports

#

Title

Description

Input Scalar Used

Parameter Scalar Used

0

Center Frequency

Indicates the filter center frequency in Hz (cycles per second) for each filter form

YES

YES

1

Q

Indicates the 'Quality value' of the filter

YES

YES

2

(unused)

Future feature placeholder.

N/A

N/A

3

Input Signal

Any input signal.

NO

NO

Output Ports

#

Title

Description

0

Filtered Signal

A filtered and power-balanced version of the Input Signal