I have a setup where I record several analog signals. I want to clean up these signals using a low pass filter.

Something like this:

     
      float k = 0.5; //alpha level for lowpass function
      float cleanSignal; // global veriable for lowpass function
      void setup()
      {
      cleanSignal = 0; //initialize global value for lowpass function
      }
     
      void draw()
      {
      println (lowpass (*input/signal*, k));
      }
     
      float lowpass(float signal, float k)
      {                     //is k set globally? is cleansignal initialized globally and declared in setup?
      float oldSignal = cleanSignal;
      cleanSignal = oldSignal + (k * (signal - oldSignal));
      return cleanSignal;
      }
 

Now, the problem is, i want to be able to call the function with each of my signals i.e. dataA = lowpass (signalA, k); and dataB = lowpass (signalB, k);

Is there any way of writing one function which can filter each signal individually for me? Possibly using the static function?

Any tip would be apreceated.

Thanks

P.

I need to solve 2 problems for a class and just realized that I have no clue how to do it and need to have it done by tomorrow morning.

Here is the one I cannot figure out:

Create a function that takes as input two arrays of the same size and returns a new array which is the pairwise sum of both input arrays.

Number one I believe I solved::

Create a function that takes as input an array of integers and returns the average of the array as the outcome.


float result;
float value;
void setup (){
 value = avarege(1,2,3,4);
 println (value);
}


float avarege ( int x1, int x2, int x3, int x4) {
  result = (x1 + x2 + x3 + x4) / 4 ;
  return (result);
}


****

Please, I would really, really appreciate some help or even the solution (as I am really stressing out with other stuff as well at the moment.)

You would be doing me a huge favor.

Regards

P.