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Is downsampling a better option??????

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wajahat

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Hi everyone.I am sampling at 8000.This is the min sampling rate possible.I cant sample at rate lower than this in dsp tms320c6713.I want to implement a bandpass and a notch filter in cascade.If i change the sampling rate to 300 using decimation and interpolation i would be able to reduce the computations required.
But on the other hand interpolation and decimation filter themself apply a lowpass filter .So the number of computations i would be saving in bandpass and notch filter they will be used by this low pass filter.
So what should i do for this arrangement.
Should i apply a multirate filter or do whitout it.
Any response in this regard would be helpful.
Thanks wajahat.
 

Hi

It depends on the signals you are processing, if there is no lose of information when you do the decimation thing, there is no problem, on the other hand if you lose some valueable information it will be a problem.

Sal
 

What is your signal bandwidth? decimation can be reduced just dropping samples (no filtering), if your signal is no bigger than 150 Hz. Then, it would be just enough to work at 300 samples/s.
-b
 

Go for the decimation method. Since you are bringing the samp freq by almost 25 times, i dont think the time you lose to down sample is going to be a big issue. Becos you have now 25 times the time!
 

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