title: Filter coefficients in matlab
body: <p>I'm learning about signal processing and currently I have to do an speech synthesizer in Matlab. For emulate the resonator system of the mouth I've this transfer function:</p>
  
  <p>R(z) = 1   -   z ^(-1)</p>
  
  <p>Can I implement this system with filter function in Matlab? I don't know how to extract the coeficients "a" and "b"...</p>
  
  <p>Note: y = filter(b, a, x), where x is the input signal that we have to filter.</p>
  
  <p>Thank you all!</p>