3.6.3.1 Symmetric FIR Filter

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In symmetrical FIR filters, the coefficients are symmetrical. Because of the symmetry, an M-tap FIR filter can be implemented using M/2 Math blocks. The Math block pre-adder is used to add the input signal feeding the symmetric filter coefficients, as shown in the following figure.

Figure 3-9. Symmetric FIR Filter Implementation

Anti-symmetric FIR filters can also be implemented in the same way, but with the pre-adder configured to subtract the input signals feeding the anti-symmetric filter coefficients, as shown in Figure 1.

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