How to make simple audio measures with a sound card?

Hello

I have audio simple (level, THD, frequency) of the measures in LabVIEW with a sound card.

The audio signal is a sinusoidal 1 kHz analog single.
I know it's better to do it with a real audio Analyzer, but it would be a significant investment.
So, how can it be achieved with a standard of PC sound card? Thank you.

I have a measurement of base (amplitude, frequency) with the following code:

Tags: NI Software

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