0.4 Fir filter on ti chip

5. fir filter on the ti chip.

To create a FIR filter which matches a desired inverse filter, use the built in MATLAB filter design program called fir2 [b = fir2(n,f,m)]. This designs an n order FIR filter which attempts to create an FIR filter whose spectrum matches a linear interpolation between input amplitudes m at frequencies f. The coefficients (b) are obtained by applying an inverse Fourier transform to m at frequencies f and multiplying by a window. In creating an inverse filter, the default Hamming window is acceptable because it provides a balance between the dynamic range and the resolution of the signal. The response of the inverse filter at different frequencies should not be so different that a huge dynamic range is required. Finally enter these coefficients into the TI chip and produce an FIR filter.

h=fir2(62, ((10.^(linspace(0,1,length(targetfft))'))-1)/9,targetfft);