Struct synfx_dsp::VPSOscillator

pub struct VPSOscillator { /* private fields */ }

Vector Phase Shaping Oscillator. The parameters d and v control the shape of the sinus wave. This leads to interesting modulation properties of those control values.

 use synfx_dsp::*;

 // Randomize the initial phase to make cancellation on summing less
 // likely:
 let mut osc =
     VPSOscillator::new(rand_01() * 0.25);


 let freq   = 440.0; // Hz
 let israte = 1.0 / 44100.0; // Seconds per Sample
 let d      = 0.5;   // Range: 0.0 to 1.0
 let v      = 0.75;  // Range: 0.0 to 1.0

 let mut block_of_samples = [0.0; 128];
 // in your process function:
 for output_sample in block_of_samples.iter_mut() {
     // It is advised to limit the `v` value, because with certain
     // `d` values the combination creates just a DC offset.
     let v = VPSOscillator::limit_v(d, v);
     *output_sample = osc.next(freq, israte, d, v);
 }

It can be beneficial to apply distortion and oversampling. Especially oversampling can be important for some d and v combinations, even without distortion.

 use synfx_dsp::{VPSOscillator, rand_01, apply_distortion};
 use synfx_dsp::Oversampling;

 let mut osc = VPSOscillator::new(rand_01() * 0.25);
 let mut ovr : Oversampling<4> = Oversampling::new();

 let freq   = 440.0; // Hz
 let israte = 1.0 / 44100.0; // Seconds per Sample
 let d      = 0.5;   // Range: 0.0 to 1.0
 let v      = 0.75;  // Range: 0.0 to 1.0

 let mut block_of_samples = [0.0; 128];
 // in your process function:
 for output_sample in block_of_samples.iter_mut() {
     // It is advised to limit the `v` value, because with certain
     // `d` values the combination creates just a DC offset.
     let v = VPSOscillator::limit_v(d, v);

     let overbuf = ovr.resample_buffer();
     for b in overbuf {
         *b = apply_distortion(osc.next(freq, israte, d, v), 0.9,  1);
     }
     *output_sample = ovr.downsample();
 }

Implementations

impl VPSOscillator

pub fn new(init_phase: f32) -> Self

Create a new instance of VPSOscillator.

• init_phase - The initial phase of the oscillator.

pub fn reset(&mut self)

Reset the phase of the oscillator to the initial phase.

pub fn limit_v(d: f32, v: f32) -> f32

This rather complicated function blends out some combinations of ‘d’ and ‘v’ that just lead to a constant DC offset. Which is not very useful in an audio oscillator context.

Call this before passing v to VPSOscillator::next.

pub fn next(&mut self, freq: f32, israte: f32, d: f32, v: f32) -> f32

Creates the next sample of this oscillator.

• freq - The frequency in Hz.
• israte - The inverse sampling rate, or seconds per sample as in eg. 1.0 / 44100.0.
• d - The phase distortion parameter d which must be in the range 0.0 to 1.0.
• v - The phase distortion parameter v which must be in the range 0.0 to 1.0.

It is advised to limit the v using the VPSOscillator::limit_v function before calling this function. To prevent DC offsets when modulating the parameters.

Trait Implementations

impl Clone for VPSOscillator

fn clone(&self) -> VPSOscillator

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for VPSOscillator

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.