Calculating CBV from peak in spectrum

This method calculates the capillary blood cell velocity (CBV) by finding the frequency component in the power spectrum with the strongest signal.

All frequencies above the highest frequency which is higher than the threshold are ignored, and the peak is searched for in only the higher50% of frequencies below this.

This method is best for good signals with a strong peak and a characteristic 'whistling' sound, it also exhibits a lower dependence on the threshold setting than the Maximum method.