Hello Guys,

I'm in need of implementing butter worth filter in C++. Problem is I don't know about the butter worth filter internals.

I have a code in MathLab which used to filter some ECG signals( Echo Cardio Gram) this will be used further to process. I need to port this code portion to VC++.
The code snippet is
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%
%%% Frequency Analysis and Pre Filtering
%%% Type 4th order Butterworth (fixed) & fc =30Hz

[BB1,AA1] =butter(4,30*SamplingTime/1000); % fc=30Hz

%%% ECG waveform
EW1 =filter(BB1,AA1,NECG);

Where NECG is an array of 640 double values.

Any help to this porting will be highly appreciated.

Anurag

We can probably help with porting but you'll have to provide the definition of butter() and filter(). Check any documentation you've got.