Steps the NCO with variable frequency and/or phase signals.

Parameters:¶

freq: NDArray[float_] | None = None¶

The variable frequency signal $f[n]$ in radians/sample. This input signal varies the per-sample phase increment of the NCO. If None, the signal is all zeros.

phase: NDArray[float_] | None = None¶

The variable phase signal $p[n]$ in radians. This input signal varies the per-sample phase offset of the NCO. If None, the signal is all zeros.

Returns:¶

The output complex signal $y[n]$.

Examples¶

See the Phase-locked loops example.