downsample

2011 11 18
2 个回答
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1 个投票

is there a matlab command that will filter and downsample data?

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Baba
Baba 2011-11-18
I found a command " decimate ". it seems like it does the trick. I have not tried it yet though.
Walter Roberson
Walter Roberson 2011-11-18
decimate is in the signals processing toolbox
Honglei Chen
Honglei Chen 2011-11-18
Be aware that decimate has limited filtering support, not as flexible as the ones I mentioned below.
Baba
Baba 2011-11-21
yes, i noticed that only a chebishev I and FIR filters are available, as I understand for decimate command.
Baba
Baba 2011-11-21
yep, the only toolbox that i have is the sptool

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Honglei Chen
Honglei Chen 2011-11-18

0 个投票

There are several possibilities. You can use either upfirdn or design the filter using fdesign.decimator and then filter your signal.
doc upfirdn
doc fdesign.decimator

更多回答（1 个）

Walter Roberson
Walter Roberson 2011-11-18

1 个投票

imresize() in the Image Processing Toolbox

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Baba
Baba 2011-11-18
unfortunately i don't have that toolbox
Walter Roberson
Walter Roberson 2011-11-18
There isn't any command for it in basic MATLAB. You may be able to construct routines for it out of basic MATLAB, depending on how you want to do your filtering. For example, you could fft2, adjust the frequency matrix, then ifft2() specifying fewer points than the original had.

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