Sources

In the section Sources libraries Signal Processing you can generate signals such as variable frequency cosine (chirp) and continuous or discrete sine wave.

Chirp: Generation of a cosine signal with varying frequency (chirp).
Discrete Impulse: Generates a discrete pulse.
From Multimedia File: Stream from a multimedia file.
NCO: Generates real or complex sinusoidal signals.
Signal From Workspace: Loads data from the workspace as a signal.
DSP Sine Wave: Generates a discrete sinusoid.