How can I calculate SNR of a sound signal by FFT function of LabWINDOWS?

[Lab]

I can calculate THD of a sound signal through some functions of LabWINDOWS,but SNR?Are there some functions that is useful to calculate SNR in LabWINDOWS?

[RajivG]

Hello,

To compute SNR in LabWindows/CVI, you can use it's equation. The CVI code for the equation would look like the following:

RMS (VS_Array, VS_Elements, &VSrms);
RMS (VN_Array, VN_Elements, &VNrms);
SNR = 10*log10 (VSrms/VNrms);

I hope it helps,
Rajiv