Struct NoiseShaper 

pub struct NoiseShaper { /* private fields */ }

High-order noise shaping quantizer with SoX-verified coefficients

Features:

• 9-tap error feedback (supports all SoX curves)
• Internal xorshift64 RNG (realtime-safe, no thread_rng overhead)
• TPDF dither at ±1 LSB (standard amplitude)
• Error clamp ±2 LSB (prevents burst noise)
• Runtime curve switching with history reset

Implementations

impl NoiseShaper

pub fn new(channels: usize, sample_rate: u32, bits: u32) -> Self

Create new NoiseShaper with auto-selected curve

pub fn set_enabled(&mut self, enabled: bool)

Enable or disable noise shaping

pub fn set_bits(&mut self, bits: u32)

Set target bit depth (Defect 37 fix)

Reachable from the audio thread via NoiseShaperProcessor::sync_params, so this must stay allocation- and log-free.

pub fn curve(&self) -> NoiseShaperCurve

Get current curve

pub fn sample_rate(&self) -> u32

Get current sample rate

pub fn bits(&self) -> u32

Get current bit depth

pub fn set_curve(&mut self, curve: NoiseShaperCurve)

Switch to a different noise shaping curve.

Clears error history to prevent artifacts from coefficient mismatch, and respects the caller’s explicit choice even when the curve is not recommended for the current sample rate (callers can query NoiseShaperCurve::is_recommended_for beforehand). Reachable from the audio thread via NoiseShaperProcessor::sync_params, so it stays allocation- and log-free.

pub fn set_sample_rate(&mut self, sample_rate: u32)

Update sample rate (triggers curve auto-selection)

pub fn process_sample(&mut self, sample: f64, ch: usize) -> f64

Process a single sample with noise shaping and dither

Arguments

• sample - Input sample in [-1, 1] range
• ch - Channel index for error history

Returns

• Quantized sample in [-1, 1] range

pub fn process(&mut self, buffer: &mut [f64], channels: usize)

Process a buffer of samples (convenience method)

pub fn reset(&mut self)

Reset error history (useful when starting new track)