At a recent checkup, I was shocked: Even though I was eating foods rich in saturated fat and a seemingly more indulgent diet, my total cholesterol was down 10 points, my bad LDL cholesterol was stellar, and my good HDL was the highest it's ever been.
As the frequency of the signal to be measured increases to approach the frequency of the source frequency, measurement error increases. To improve the accuracy of the frequency measurement for higher unknown frequency, we can use this second measurement method, count number of pulses in known time.
Mean frequency is a pitch measure, that assesses the center of the distribution of power across frequencies. Here is an example of mean frequency estimates in a thrush nightingale song: -. As indicated by the purple curve, the mean frequency provides a smooth estimate of the concentration of spectral power. This estimate is often (but not always) superior to peak frequency, which might 'jump' from one harmonic to the next.