Struct Welch 

pub struct Welch {
    pub resolution: f64,
    pub overlap: f64,
    pub taper: Taper,
}

Welch’s method: what resolution to estimate at, and how hard to average.

Averaging the periodograms of overlapping segments trades frequency resolution for a quieter estimate, which is the trade a noisy measurement wants and a phase-sensitive one does not. Welch::estimate is the run.

Fields

resolution: f64

The frequency resolution to aim for, in Hz.

One segment is rate / resolution samples long, so a finer resolution buys more bins out of fewer averages.

overlap: f64

How much of each segment the next one repeats, 0.0..1.0.

taper: Taper

The taper applied to every segment.

Implementations

impl Welch

pub fn new(resolution: f64) -> Self

A default estimate at a stated resolution: half overlap, Hann taper.

pub fn estimate(&self, samples: &[f64], rate: f64) -> Estimate

Estimates the amplitude spectrum of samples sampled at rate Hz.

Segments shorter than 64 samples are not worth averaging and the segment length is clamped there; a signal too short to divide is transformed once instead, so an estimate is always answered on the same terms.

Phase is not part of the answer, and that is the method rather than an omission: averaging periodograms discards it.

Trait Implementations

impl Clone for Welch

fn clone(&self) -> Welch

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Welch

impl Debug for Welch

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

Formats the value using the given formatter.

impl Default for Welch

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for Welch

fn eq(&self, other: &Welch) -> 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 StructuralPartialEq for Welch