hann_series

boulderopal.signals.hann_series(duration, coefficients)

Create a Signal object representing a sum of Hann window functions.

Parameters:

duration (float) – The duration of the signal, \(T\).
coefficients (np.ndarray) – The coefficients for the different Hann window functions, \(c_n\). It must be a 1D array.

Returns:

The Hann window functions series.

Return type:

Signal

See also

boulderopal.signals.cosine_pulse: Create a Signal object representing a cosine pulse.
boulderopal.signals.sinusoid: Create a Signal object representing a sinusoidal oscillation.
Graph.signals.hann_series_pwc: Graph operation to create a Pwc representing a sum of Hann window functions.
Graph.signals.hann_series_stf: Graph operation to create an Stf representing a sum of Hann window functions.

Notes

The series is defined as

\[\mathop{\mathrm{Hann}}(t) = \sum_{n=1}^N c_n \sin^2 \left( \frac{\pi n t}{T} \right) ,\]

where \(N\) is the number of coefficients.

Examples

Define a simple Hann series.

>>> signal = bo.signals.hann_series(
...     duration=5.0,
...     coefficients=np.array([0.5, 1, 0.25]),
... )
>>> signal.export_with_time_step(time_step=0.5)
array([0.15925422, 1.00144425, 1.375     , 1.05757275, 0.78172879,
   0.78172879, 1.05757275, 1.375     , 1.00144425, 0.15925422])