cutcutcodec.core.signal.window.band_to_alpha

cutcutcodec.core.signal.window.band_to_alpha(band: Real) → float

Inverse of the empirical estimation based on regression.

Bijection of alpha_to_band().

As there is no closed form for this function, it is approximated using the tangent method.

Examples

>>> from cutcutcodec.core.signal.window import alpha_to_band, band_to_alpha
>>> round(alpha_to_band(band_to_alpha(0.9)), 6)
0.9
>>> round(alpha_to_band(band_to_alpha(1.8)), 6)
1.8
>>> round(alpha_to_band(band_to_alpha(3.4)), 6)
3.4
>>> round(alpha_to_band(band_to_alpha(4.9)), 6)
4.9
>>> round(alpha_to_band(band_to_alpha(6.4)), 6)
6.4
>>>