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