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Theoretical question on downsampling

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Hey guys,

 

I have a samplerate of 48kSPS on the myRIO. After a phase selective detection, the wanted signal is at 0Hz = DC. Now, I have to downsample my signal, as I want to low pass filter the signal at around 1Hz or 0.5Hz.

For this I use a 2 stage CIC filter. The input is I24.24 converted into I64 and as I only use change rates which are powers of two, I scale my CIC output with a bitshift back to I24.24, so register growth is no issue for further processing.

 

Can someone tell me what are disadvantages of high decimation rates?

 

At the moment I use 512, but I cant find any disadvantage in using 1024 or 2048...

 

Kind regards

 

Slev1n


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