pub fn occupied_bandwidth(
frequency: &[f64],
magnitude: &[f64],
low: f64,
high: f64,
fraction: f64,
) -> Option<(f64, f64, f64)>Expand description
The narrowest span of the band holding fraction of its energy.
Answers (lower, upper, bandwidth) in Hz, where the bandwidth includes the
width of the bins at both ends. Unlike rolloff, which always starts at
the bottom, this slides a window: a signal sitting high in the band is
measured where it is.