scipy.signal.ShortTimeFFT.

scipy.signal.ShortTimeFFT.dual_win

property ShortTimeFFT.dual_win

Dual window (canonical dual window by default).

A STFT can be interpreted as the input signal being expressed as a weighted sum of modulated and time-shifted dual windows. If no dual window is given on instantiation, the canonical dual window, i.e., the window with the minimal energy (i.e., minimal L²-norm) is calculated. Alternative means for determining dual windows are provided by closest_STFT_dual_window and the from_win_equals_dual class-method. Note that win is also always a dual window of dual_win.

dual_win has same length as win, namely m_num samples.

If the dual window cannot be calculated a ValueError is raised. This attribute is read only and calculated lazily. To make this array immutable, its WRITEABLE flag is set to FALSE.

See also

m_num

Number of samples in window win and dual_win.

win

Window function as real- or complex-valued 1d array.

from_win_equals_dual

Create instance where win and dual_win are equal.

closest_STFT_dual_window

Calculate dual window closest to a desired window.

numpy.ndarray.setflags

Modify array flags.

ShortTimeFFT

Class this property belongs to.