pub fn compute_e_p(pitch_est_buf: &[f32; 301]) -> [f32; 203]Expand description
Compute IMBE’s E(p) detectability function for one 301-sample
pitch-estimation buffer.
Returns 203 fractional values in [0, 1], one per candidate
pitch index on the 0.5-sample grid 21.0 .. 122.0. A value near
zero at index i means the signal is well-explained by a
period of 21 + i·0.5 samples (plus its harmonic multiples).
Exposed so the encoder can maintain a ring of 3 E(p) arrays
and hand them to PitchTracker::estimate_with_lookahead. The
single-frame PitchTracker::estimate calls this internally.