Struct DirectForm 

pub struct DirectForm<T, const N: usize = 1, const M: usize = 2> {
    pub x: [T; M],
    pub y: [[T; M]; N],
}

Direct Form biquad/SOS state

Fields

x: [T; M]

Input delay line

[x0, x1]

y: [[T; M]; N]

Intermediate and output delay lines

[[y0, y1]]

Implementations

impl<T: Copy, const N: usize> DirectForm<T, N>

pub fn x0(&self) -> T

Get latest input

pub fn y0(&self) -> T

Get current output

pub fn set_y(&mut self, y: T)

Set current and last output of the last stage.

This is a NOP for N=0.

Trait Implementations

impl<T: Clone, const N: usize, const M: usize> Clone for DirectForm<T, N, M>

fn clone(&self) -> DirectForm<T, N, M>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug, const N: usize, const M: usize> Debug for DirectForm<T, N, M>

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

Formats the value using the given formatter.

impl<T, const N: usize, const M: usize> Default for DirectForm<T, N, M>

where [T; M]: Default, [[T; M]; N]: Default,

fn default() -> Self

Returns the “default value” for a type.

impl<T: Copy + Add<Output = T>, const N: usize> Process<T> for DirectForm<T, N, 1>

N Poles at DC, N zeros at Nyquist

fn process(&mut self, x: T) -> T

Update the state with a new input and obtain an output

fn block(&mut self, x: &[X], y: &mut [Y])

Process a block of inputs into a block of outputs

impl<C, T: Copy> SplitInplace<T, DirectForm<T>> for Normal<C>

where Self: SplitProcess<T, T, DirectForm1<T>>,

fn inplace(&self, state: &mut S, xy: &mut [X])

See also [Inplace::inplace]

impl<T: 'static + Copy + Add<Output = T> + PartialOrd, C: Copy + Mul<T, Output = A>, A: Add<Output = A> + AsPrimitive<T>> SplitProcess<T, T, DirectForm<T>> for Biquad<C>

fn process(&self, state: &mut DirectForm1<T>, x0: T) -> T

Process an input into an output

fn block(&self, state: &mut S, x: &[X], y: &mut [Y])

Process a block of inputs

impl<T: Copy + Add<Output = T> + PartialOrd, C> SplitProcess<T, T, DirectForm<T>> for BiquadClamp<C, T>

where Biquad<C>: SplitProcess<T, T, DirectForm1<T>>,

use dsp_process::SplitProcess;
use idsp::iir::*;
let biquad = BiquadClamp::<f32, f32>::from(Biquad::IDENTITY);
let mut state = DirectForm2Transposed::default();
let x = 3.0f32;
let y = biquad.process(&mut state, x);
assert_eq!(x, y);

fn process(&self, state: &mut DirectForm1<T>, x0: T) -> T

Process an input into an output

fn block(&self, state: &mut S, x: &[X], y: &mut [Y])

Process a block of inputs

impl<C: Copy + Mul<T, Output = A> + Neg<Output = C>, A: Add<Output = A> + AsPrimitive<T>, T: 'static + Copy> SplitProcess<T, T, DirectForm<T>> for Normal<C>

The y1, y2 aren’t DF1 but y1.re() and y1.im()

fn process(&self, state: &mut DirectForm1<T>, x0: T) -> T

Process an input into an output

fn block(&self, state: &mut S, x: &[X], y: &mut [Y])

Process a block of inputs

impl<T: Copy + Mul<Output = T> + Add<Output = T>> SplitProcess<T, T, DirectForm<T, 0>> for Biquad<T>

use dsp_process::SplitProcess;
use idsp::iir::*;
let biquad = Biquad::<f32>::IDENTITY;
let mut state = DirectForm2Transposed::default();
let x = 3.0f32;
let y = biquad.process(&mut state, x);
assert_eq!(x, y);

fn process(&self, state: &mut DirectForm2Transposed<T>, x0: T) -> T

Process an input into an output

fn block(&self, state: &mut S, x: &[X], y: &mut [Y])

Process a block of inputs

impl<T: Copy + Add<Output = T> + Mul<Output = T> + PartialOrd> SplitProcess<T, T, DirectForm<T, 0>> for BiquadClamp<T, T>

fn process(&self, state: &mut DirectForm2Transposed<T>, x0: T) -> T

Process an input into an output

fn block(&self, state: &mut S, x: &[X], y: &mut [Y])

Process a block of inputs

impl<const N: usize, T: 'static + Copy, C: Copy + Mul<T, Output = A>, A: Add<Output = A> + AsPrimitive<T>> SplitProcess<T, T, DirectForm<T, N>> for Cascade<[Biquad<C>; N]>

let mut state = DirectForm1 {
    x: [0.0, 1.0],
    y: [[2.0, 3.0]],
};
let x0 = 4.0;
let y0 = Biquad::<f32>::IDENTITY.process(&mut state, x0);
assert_eq!(y0, x0);
assert_eq!(state.x, [x0, 0.0]);
assert_eq!(state.y[0], [y0, 2.0]);

fn process(&self, state: &mut DirectForm<T, N>, x0: T) -> T

Process an input into an output

fn block(&self, state: &mut S, x: &[X], y: &mut [Y])

Process a block of inputs