This object computes crossover bi-quadratic filter coefficients and calculates the output of the input audio buffers
processed through the filters that users specify.
From SFD, the user can select what type of filtering to carry out via the “Biquad Topology field”:
- Direct Form I
- Direct Form II
- Transposed Direct Form II
In SFD, users can set the number of channels (the number of input and output channels is the same) as
well as the number of filters. Users can also select the object corresponding to the required mode.
The memory layout is exposed in GTT as (per filter):
- Frequency (Cut-off)
- Type of filter
- Bypass
- High pass 1
- High pass Butterworth 2
- High pass Bessel 2
- High pass Linkwitz Riley 2
- High pass Butterworth 3
- High pass Bessel 3
- High pass Butterworth 4
- High pass Bessel 4
- Low pass Linkwitz-Riley 4
- Low pass 1
- Low pass Butterworth 2
- Low pass Bessel 2
- Low pass Linkwitz Riley 2
- Low pass Butterworth 3
- Low pass Bessel 3
- Low pass Butterworth 4
- Low pass Bessel 4
- Low pass Linkwitz-Riley 4
- Bypass (on/off)