Function mel_to_hz_htk 

pub fn mel_to_hz_htk(mel: Smpl) -> Smpl

Convert mel to frequency (Hz)

• mel Input mel to convert

Converts a scalar from the mel scale to the frequency domain, using the equation defined by O’Shaughnessy, as implemented in the HTK speech recognition toolkit:

f = 700 * e ^ (f / 1127 - 1)

See also hz_to_mel_htk(), mel_to_hz().