Hallo Everybody,
   
  I'd like to ask about FIR filter coefficients, I am using "firceqrip" command. I
get all the coeff. in positive value, i.e., the impulse response is only positive values. 
  I'd like to knoe if it is practically to implement such a filter?
  What is the difference between to have all the coeff. positive or to have it mix between
positive and negative.
   
  Thanks in advance.