Enum NoiseShaperCurve 

pub enum NoiseShaperCurve {
    Lipshitz5,
    FWeighted9,
    ModifiedE9,
    ImprovedE9,
    TpdfOnly,
}

Noise shaping curve presets All coefficients from SoX src/dither.c, NTF zeros verified |z| < 1

Variants

Lipshitz5

Lipshitz 5-tap - general purpose, works well at 44.1/48kHz NTF max|z| = 0.961, 4kHz notch -27.2dB

FWeighted9

F-weighted 9-tap - psychoacoustically optimized for 44.1kHz Deepest notch in 2-5kHz region (human hearing most sensitive) NTF max|z| = 0.914

ModifiedE9

Modified-E 9-tap - moderate high-frequency push NTF max|z| = 0.916

ImprovedE9

Improved-E 9-tap - most aggressive HF noise shaping NTF max|z| = 0.959

TpdfOnly

Pure TPDF only, no noise shaping Recommended for 96kHz+ where shaping benefit diminishes

Implementations

impl NoiseShaperCurve

pub fn auto_select(sample_rate: u32) -> Self

Auto-select curve based on sample rate

• 44.1kHz: Lipshitz5 (safe default)
• 48kHz: Lipshitz5 (acceptable 8.8% offset)
• 88.2/96kHz+: TpdfOnly (shaping benefit diminishes)

pub fn coeffs(&self) -> [f64; 9]

Get verified SoX coefficients Returns 9-element array (lower-order curves pad with zeros)

pub fn is_recommended_for(&self, sample_rate: u32) -> bool

Check if this curve is recommended for given sample rate Unified boundary at 50_000 Hz based on NTF degradation analysis:

• At 48kHz: all curves have ≤6dB 4kHz notch degradation (acceptable)
• At 88.2kHz: only FWeighted9/ImprovedE9 stay ≤6dB, others exceed
• Conservative choice: recommend TpdfOnly for all rates >50kHz

Trait Implementations

impl Clone for NoiseShaperCurve

fn clone(&self) -> NoiseShaperCurve

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for NoiseShaperCurve

impl Debug for NoiseShaperCurve

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

Formats the value using the given formatter.

impl Default for NoiseShaperCurve

fn default() -> NoiseShaperCurve

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for NoiseShaperCurve

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for NoiseShaperCurve

impl From<NoiseShaperCurve> for u8

fn from(curve: NoiseShaperCurve) -> Self

Converts to this type from the input type.

impl From<u8> for NoiseShaperCurve

fn from(value: u8) -> Self

Converts to this type from the input type.

impl PartialEq for NoiseShaperCurve

fn eq(&self, other: &NoiseShaperCurve) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for NoiseShaperCurve

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for NoiseShaperCurve