anti-aliasing filter after sampling
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can I applied an anti-aliasing filter to the signal after sampling; and how to do this
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Star Strider
2014-12-31
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As a general rule, anti-aliasing filters are implemented in hardware (as analogue filters) before sampling. An aliased signal in your sampled signal will always be part of it.
8 个评论
mouh nyquist
2015-1-1
Star Strider
2015-1-1
The problem with not using an anti-aliasing filter in hardware is that signals above the Nyquist frequency of your digitising hardware will be included in your sampled signal. You cannot then filter them out. A discrete anti-aliasing filter will be a broadband filter including everything up to the Nyquist frequency — and that would be your entire sampled signal. It would therefore serve no purpose to filter it.
mouh nyquist
2015-1-1
Star Strider
2015-1-1
My pleasure.
I have no idea what a ‘Dspace 1104’ is or what it can do.
Anything you can implement in Simulink is essentially the same as the rest of MATLAB, with the same restrictions. What I said earlier applies to Simulink as well.
A suitable anti-aliasing hardware filter is fairly easy to design and construct using a single op-amp. You can probably find the instructions and design equations online. The op-amp and design of course depend on the frequency you are filtering.
mouh nyquist
2015-1-1
Star Strider
2015-1-1
My pleasure.
Does it have its own anti-aliasing filters? If it is a DAQ board, it might.
mouh nyquist
2015-1-1
Star Strider
2015-1-1
My pleasure!
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