sdr.energy(x: ArrayLike, axis: int | tuple[int, ...] | None = None, db: bool = False) → NDArray[float64]

Measures the energy of a time-domain signal x[n].

E=∑n=0N−1|x[n]|2

Parameters:
x: ArrayLike

The time-domain signal x[n] to measure.

axis: int | tuple[int, ...] | None = None

Axis or axes along which to compute the energy. The default is None, which computes the energy of the entire array.

db: bool = False

Indicates whether to return the result in decibels (dB).

Returns:

The signal energy. If db=False, E is returned. If db=True, 10log10⁡E is returned.