Function synfx_dsp::process_simper_svf

pub fn process_simper_svf(
    input: f32,
    freq: f32,
    res: f32,
    israte: f32,
    ic1eq: &mut f32,
    ic2eq: &mut f32
) -> (f32, f32, f32)

This function processes a Simper SVF with 12dB. It’s a much newer algorithm for filtering and provides easy to calculate multiple outputs.

• input - Input sample.
• freq - Frequency in Hz. otherwise the filter becomes unstable.
• res - Resonance from 0.0 to 0.99. Resonance of 1.0 is not recommended, as the filter will then oscillate itself out of control.
• israte - 1.0 divided by the sampling rate (eg. 1.0 / 44100.0).
• band - First state variable, containing the band pass result after processing.
• low - Second state variable, containing the low pass result after processing.

This function returns the low pass, band pass and high pass signal. For a notch or peak filter signal, please consult the following example:

    use synfx_dsp::*;

    let samples   = vec![0.0; 44100];
    let mut ic1eq = 0.0;
    let mut ic2eq = 0.0;
    let mut freq  = 1000.0;

    for s in samples.iter() {
        let (low, band, high) =
            process_simper_svf(
                *s, freq, 0.5, 1.0 / 44100.0, &mut ic1eq, &mut ic2eq);

        // You can easily calculate the notch and peak results too:
        let notch = low + high;
        let peak  = low - high;
        // ... do something with the result here.
    }