Is it possible to control the individual products and accumulators of my QFILT object with the DSP Blockset 5.0 (R13)?

I can set the properties for my QFILT object for FIR and IIR filters. However, I do not have access to each accumulator and multiplier input/ output.

QFILT allows me to assign all the attributes at once. However, for optimal design, I need the internal accumulators and multipliers to be of different sizes or need them to have different rounding schemes.

For example,in my project, I need to assign attributes such as "bit width", "type of rounding" etc., to each internal accumulator and multiplier.

Answer 1

[MathWorks Support Team]

The ability to control the individual products and accumulators of the QFILT object is available with the DSP Blockset 5.0(R13).

You can start with a QFILT object "Hq" that has a filter structure and coefficients and then execute the following line of code to get a Simulink model in which you can control individual adders and gains.

realizemdl(Hq)

For a clearer understanding, refer to the example below:

[b,a] = butter(5,.5);

Hq = qfilt('df1',{b,a});

%#1 Default syntax:

realizemdl(Hq);

%#2 Using parameter/value pairs:

realizemdl(Hq, 'BlockType', 'Fixed-point blocks', 'OptimizeZeros', 'on');