In the first part of this tutorial lesson, you will define a digital filter as a basic delay element. The Z-domain transfer function of this filter is given by:
<math>H(z) = z^{-1/2} = \frac{1}{z} = \frac {0(-z^{1/2})^2 + 0(-z^{1/2}) + 1}{1(-z^{1/2})^2 + 0(-z^{1/2}) + 0} </math>
This means that N= 1, M = 0, the coefficients of the denominator must be "1 0 0" and the numerator has only one coefficient "1". You don't have to enter the leading zero coefficients in the numerator.