Struct ToneFeedback 

pub struct ToneFeedback {
    pub b0: f64,
    pub b1: f64,
    pub a1: f64,
    pub dc_gain: f64,
    /* private fields */
}

First-order IIR filter derived from an inverting op-amp active high-shelf circuit (e.g. Klon Centaur treble control).

Coefficients are computed analytically from component values and updated when the pot position changes.

Fields

b0: f64

b1: f64

a1: f64

dc_gain: f64

Implementations

impl ToneFeedback

pub fn new( rf: f64, ri: f64, c_tone: f64, r_shelf: f64, max_pot_r: f64, _pot_id: String, sample_rate: f64, pot_pos: f64, ) -> Self

Create a new ToneFeedback IIR from circuit component values.

Arguments

• rf — feedback resistor (Ω)
• ri — input resistor (Ω)
• c_tone — tone capacitor (F)
• r_shelf — shelf resistor in feedback path (Ω)
• max_pot_r — maximum pot resistance (Ω)
• _pot_id — pot label (for future binding, currently unused)
• sample_rate — sample rate (Hz)
• pot_pos — initial pot position in [0.0, 1.0]

pub fn recompute(&mut self, pot_pos: f64)

Recompute IIR coefficients for a new pot position.

This applies the bilinear transform to the s-domain transfer function with the updated pot resistance. Cheap arithmetic — no matrix ops.

pub fn process(&mut self, x: f64) -> f64

Process one audio sample through the first-order IIR.

pub fn reset(&mut self)

Reset filter state (clear delay line).