Struct Decay 

pub struct Decay { /* private fields */ }

The decay of one tail: the noise floor and a decay time per fit range.

Implementations

impl Decay

pub fn of(tail: &[f64], rate: SampleRate) -> Self

Analyses the samples of a tail that starts at a stop.

The analysis starts at the loudest 10 ms block, which is the first block unless the tail opens with silence or a pre-delay. That block is the reference level.

1. The noise floor is the mean power of the last 10 % of the tail, relative to the power of the reference block.
2. A line fitted to the 10 ms block levels down to 10 dB above the floor gives the time where the decay meets the floor.
3. The Schroeder integral runs from each sample to that time, plus the energy the decay would add after it at the fitted rate.
4. A line fitted to the decay curve between the range limits gives the decay time, -60 / slope: the time a 60 dB drop takes.

A fit fails when the floor lies less than 10 dB below the bottom of its range or the curve never reaches that bottom.

pub fn floor(&self) -> Option<Decibels>

Returns the noise floor relative to the level at the stop, or None when the end of the tail is digital silence.

pub fn truncation(&self) -> Seconds

Returns the time after the stop where the integral was truncated.

pub fn t20(&self) -> Result<Seconds, DecayFailure>

Returns the decay time from the -5 to -25 dB fit.

Errors

Returns the DecayFailure of the fit.

pub fn t30(&self) -> Result<Seconds, DecayFailure>

Returns the decay time from the -5 to -35 dB fit.

Errors

Returns the DecayFailure of the fit.

Trait Implementations

impl Clone for Decay

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Decay

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

Formats the value using the given formatter.

impl PartialEq for Decay

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Decay