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Difference Equation

We first write the comb filter specification in a more ``mathematical'' form as a digital filter difference equation:

$\displaystyle y(n) = x(n) + g_1\, x(n-M_1) - g_2\, y(n-M_2), \protect$ (4.1)

where $ x(n)$ denotes the $ n$th sample of the input signal, $ y(n)$ is the output at time $ n$, and $ g_1$ and $ g_2$ denote the feedforward and feedback coefficients, respectively. The signal flow graph is shown in Fig.3.1.
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