Fig. 2

Operation of the algorithm using a speech signal. Left figure, top: raw speech data. Center correlation function (black line) and peak detector function (dashed gray line). Vertical gray lines indicate a completed fundamental frequency detection. Bottom: stem plot of calculated F₀ estimates. The dashed gray lines illustrate the most recent estimate. Right figure: zoomed view of the correlation result and peak detector function contained in the box in the center plot of the left figure. The use of the new segment creates a discontinuity in \( {z}_k \)