Finding peaks on a curve

Hi! As part of an assignment I am to analyse a few hundred audio files graphically. Each data files contain two arrays that I have plotted against each other on a set of axis, however the curve isn't smooth at all, rather it is quite hazy. Still I want to calculate the number of slopes of significant magnitude (these are quite clear when looking at them graphically, these are the parts that are not hazy and are straight slopes between the greatest maxima/minima). I have tried to use the findpeaks function on the arrays, although they give me all the local minima and maxima they do not give the number of slopes between the significant maxima/minima due to the haziness of the curve. I genuinely appreciate all help

[bym]

can you post a picture of your graphs?