How to remove group delay for CMSIS DSP FIR low pass filter function?

Hello Danno5060,

Thanks for replying to my Post. So for real time data filtering what Filter do you suggest??

And, if there is a delay , then How can I ignore that delay? I've read that it can be removed in MATLAB but how to do it in C language?

I've applied what I'll call "smoothing" algorithms to buffered data as well as on simulated systems that don't delay the signal.

However, this requires not only the samples before the time in question, but the samples that are going to occur after the time of the current sample.

With buffered data, there's the buffer delay. With simulated systems, there's the fact that reality doesn't always have to happen. For most real time systems, this won't work. You don't have the sample data from what's going to happen in the future, only the samples from the past to put through your filter. That's what creates the delay for all low pass filters.

There are many things I don't know about your specific system that could possibly be re-thought. (Why use a function generator, then process the data through a computer, when you can use the computer itself to generate your functions? If you're comparing two channels worth of data, can you buffer the other channel by your delay time so that both channels line up in time at the end? I'm sure you have answers to these questions and more for your system. In the end, it's your system and not mine.)

Hello Danno,

your statement below helped me solve my issue!!

" If you're comparing two channels worth of data, can you buffer the other channel by your delay time so that both channels line up in time at the end?"

I shifted the input(last samples) & output (first samples) by the group delay and Got the original sinewave !!

Thanks