# time interval over the duration of an effect and not the signal

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jérôme TAÏEB on 2 Oct 2018
Edited: Guillaume on 3 Oct 2018
Hi,
I write a little script in command window of Matlab:
between:
t = (0: 0.001: 10)';
y = sin (2 * pi * 50 * t)
sound (y, Fs);
and
t = (0: 0.001: 100)';
y = sin (2 * pi * 50 * t)
sound (y, Fs);
the 2nd sound is lengthened in duration
OK!
Now I add an effect to this signal with effect.m:
(E)
t = (0: 0.001: 100)';
y = sin (2 * pi * 50 * t)
z = effect (y);
sound (z, Fs);
How to correct (E) for this effect to act in a time interval t1 = (a: 0.001: b) with a> 0 and b <100?
thanks
jérôme TAÏEB on 3 Oct 2018
sorry,i found the answer with a=30 and b=70:
t= (0: 0.001:30)';
x = sin (2 * pi * 50 * t);
sound(x,20000);
t = (30: 0.001:70)';
y_2= sin (2 * pi * 50 * t);
y=tremolo(y_2,20000);
sound(y,20000);
t = (70: 0.001:100)';
z = sin (2 * pi * 50 * t);
sound(z,20000);
but there lies the following problem:
from an audio file whose variable t does not intervene explicitly:
what is the function of Matlab who captures his time t?
thanks

R2018b

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