goertzel

Rust implementation of the Goertzel filter.

The Goertzel filter is faster than the FFT for a small range of frequencies of interest.

interface

• pub fn filter_naive(input: &Vec<f64>, linear_freq: f64) -> Vec<Complex<f64>>

  Just applies the filter equations and gives you the complete output.

• pub fn dft(input: &Vec<f64>, linear_freq: f64) -> Complex<f64>

  Computes the associated (closest) DFT term to a given linear frequency.

• pub fn dft_power(input: &Vec<f64>, linear_freq: f64) -> f64

  Computes the power of the signal at a given DFT bin.

TODO

• Tests