downsample

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Baba
Baba 2011-11-18
is there a matlab command that will filter and downsample data?
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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
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
imresize() in the Image Processing Toolbox
  2 个评论
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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