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Decimate to a specific number

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youngz
youngz 2017-4-22
回答： Walter Roberson 2017-4-22
Hi,
I have a signal and I would like to downsample it at a specific number (e.g. 256). I am thinking to use the function decimate(), anyway, it accepts only the integers as input. So, I cannot downsample my signal to a specific value.
The code:
myArray = 1:980;
target = 256;
[p,q] = rat(256/length(myArray));
y = decimate(myArray,p/q);
My first idea is to interpolate the data in order to reach a multiple of my target sample rate. Anyway, maybe there is a different (and better) solution.
NB: I know that there is the function resample(), anyway I am trying to find new solutions.
Regards

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回答（1 个）

Walter Roberson
Walter Roberson 2017-4-22
myArray = 1:980;
target = 256;
n_ent = length(myArray);
y = interp1( 1:n_ent, myArray, linspace(1, n_ent, target) );
You cannot use decimate() the way you had hoped to.

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