Transfer and coherence function with Labview.

[Roustan]

Please send me a Labview code with transfer function (gain vs frequency) and coherence function of 2 signals: stimulus signal (1024 pts) and response signal (1024 pts). Thanks.

[LocalDSP]

The Frequency Response Function (Mag-Phase).vi VI located in the Analyze>>Waveform Measurements palette returns the Coherence function. The attached example (LabVIEW 6.1) VI shows how it work (using a digital filter as unit-under-test).

Note that the coherence is always equal to 1.0 (by definition) if you are not averaging.