Signal Processing - Waveform envelope analysis

[y,Fs] = audioread("E:\free_lancing_projects\15.Waveform analysis\4000 Hz.wav");

t = linspace(0,2,2*Fs);

[yupper,ylower] = envelope(y);

ydB = db(y);

[R,rlt,rut,rll,rul] =risetime(db(yupper),t);

%riseTime = ut - lt;

[OS,OSLEV,OSINST] = overshoot(db(yupper),t);

[f,flt,fut,fll,ful] = falltime(db(yupper),t);

risetime(db(yupper),t);hold on;

overshoot(db(yupper),t);hold on;

falltime(db(yupper),t);