How can I obtain the quantized filter coefficients as fixed-point objects in Filter Design Toolbox 4.0 (R2006b)?

teena_khurana asked: 2021-12-27 Filter Design Toolbox , Matlab , Programming

Learn how to obtain quantized filter coefficients as fixed-point objects using Filter Design Toolbox 4.0 (R2006b) in MATLAB. Get precise control & optimize your

Expert Answer

John Williams answered . 2025-07-30 12:40:31

The ability to obtain the quantized filter coefficients as fixed-point objects is not available in the Filter Design Toolbox 4.0 (R2006b).

To work around this you can manually convert the coefficients to fixed-point objects as shown below:

d=fdesign.lowpass(0.40,0.54,0.05,50);

hd=design(d,'kaiserwin','filterstructure','dffir');

hd.Arithmetic='fixed';

set(hd,'filterInternals','specifyprecision');

hd.productWordLength = 16;

hd.accumwordLength = 40;

myfi = fimath('maxproductwordlength',16,'maxsumwordlength',40);

numerator = fi(hd.numerator,hd.signed,hd.inputwordlength,...

          hd.inputfracLength, 'fimath', myfi)

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