Accelerating Symmetric FIR Filtering

• Coefficients in linear phase filters are either symmetric or anti-symmetric

• Symmetric coefficientsy[n] = h0 x[n] + h1 x[n-1] + h1 x[n-2] + h0 x[n-3] y[n] = h0 (x[n] + x[n-3]) + h1 (x[n-1] + x[n-2])

• Accelerated by FIRS (FIR Symmetric) instruction

x in twocircularbuffers

h inprogrammemory

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