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Changing Arithmetic to fixed point for a multistage FIR design

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Pedro Gelabert
Pedro Gelabert 2018-2-7
关闭： MATLAB Answer Bot 2021-8-20
I am trying to observe the fixed point effects of a multistage decimation. However, the system object does not seem to change arithmetic to fixed point. For example:
fdDecim = fdesign.decimator(M,'lowpass', Fpass, Fstop, Apass, Astop);
msDecim = design( fdDecim, 'multistage', 'Usehalfbands', true, 'SystemObject', true);
msDecim.Stage1.CoefficientsDataType = 'Custom';
msDecim.Stage1.ProductDataType = 'Custom';
msDecim.Stage1.AccumulatorDataType = 'Custom';
msDecim.Stage2.CoefficientsDataType = 'Custom';
msDecim.Stage2.ProductDataType = 'Custom';
msDecim.Stage2.AccumulatorDataType = 'Custom';
msDecim.Stage1.CustomCoefficientsDataType = numerictype([],32,31);
msDecim.Stage1.CustomAccumulatorDataType = numerictype([],32, 31);
msDecim.Stage1.CustomProductDataType = numerictype([],32, 31);
msDecim.Stage2.CustomCoefficientsDataType = numerictype([],32,31);
msDecim.Stage2.CustomAccumulatorDataType = numerictype([],32, 31);
msDecim.Stage2.CustomProductDataType = numerictype([],32, 31);
But info(msDecim) shows Arithmetic : double
What else do I need to set to convert this object to a fixed point implementation?

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