iir: tweak
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186a1a33ce
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14
src/iir.rs
14
src/iir.rs
@ -1,3 +1,6 @@
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use core::ops::{Add, Mul};
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use core::iter::Sum;
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use core::f32;
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pub type IIRState = [f32; 5];
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@ -22,8 +25,10 @@ fn copysign(x: f32, y: f32) -> f32 {
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}
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}
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fn macc(y0: f32, x: &[f32], a: &[f32]) -> f32 {
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y0 + x.iter().zip(a.iter()).map(|(&i, &j)| i * j).sum::<f32>()
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fn macc<T>(y0: T, x: &[T], a: &[T]) -> T
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where T: Sum + Add<Output=T> + Mul<Output=T> + Copy
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{
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y0 + x.iter().zip(a.iter()).map(|(&i, &j)| i * j).sum()
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}
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impl IIR {
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@ -55,9 +60,10 @@ impl IIR {
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pub fn get_x_offset(&self) -> Result<f32, &str> {
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let b: f32 = self.ba[..3].iter().sum();
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if abs(b) < f32::EPSILON {
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return Err("b is zero")
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Err("b is zero")
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} else {
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Ok(self.y_offset/b)
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}
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Ok(self.y_offset/b)
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}
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pub fn set_x_offset(&mut self, xo: f32) {
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