Edge distortion when resampling a signal

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Romio
Romio 2020-1-18
评论： Star Strider 2020-1-19
I have the follwing cosine signal that is sampled at rate fs = 32 Hz.
f = 30;
fs = 32;
dt = 1/fs;
t = -0.5:dt:0.5;
c = cos(2.*pi.*f.*t);
figure
plot (t,c)
I want to upsample it as follows:
figure
ty = linspace(-0.5,0.5,270)
y = resample(c,1003,123);
plot(ty,y)
But as you can see there is distrotion at the edge. Is there any way to avoid that?

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Star Strider
Star Strider 2020-1-18
From the documentation:
‘When filtering, resample assumes that the input sequence, x, is zero before and after the samples it is given. Large deviations from zero at the endpoints of x can result in unexpected values for y.’ (In: Resample Linear Sequence)
Minimize it by increasing the filter order and using a Kaiser window.
For example:
y = resample(c,1003,123, 16, 192);
Experiment with these and other additional arguments to see the result.
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