Do you have LabVIEW (not only Runtime Engine)? It is very easy to place a compare node and beep sound using PC sound card.
i have labview, but how can i export data to labview from heart rate variability (HRV) analyzer in the biomedical kit3.0.
also how can i perform the same for real time signal using hrv analyzer
The HRV Analyzer could export a report (txt). You could load the txt which contains the LF/HF value in LabVIEW using read from text file VI.