Example Tapped Delay Line

• Two internal taps
• Total delay is $M_3$ samples
• Taps at $M_1$ and $M_2$ samples

Difference equation:

$$y(n) = b_0 x(n) + b_{M_1} x(n-M_1) + b_{M_2} x(n-M_2) + b_{M_3} x(n-M_3)$$

Transfer function:

$$H(z) = b_0 + b_{M_1} z^{-M_1} + b_{M_2} z^{-M_2} + b_{M_3} z^{-M_3}$$