How can I visualize filter coefficients after fixed point conversion using FVTOOL?

I have an FIR filter with a single coefficient "pi" and I perform the following steps :

1. Open a new Simulink model.

2. Use the Digital Filter block from the Signal Processing Blockset to represent this filter in a three-bit word and two-bit fraction length fixed-point representation.

The mask option "View Filter Response" opens FVTOOL to show the filter response but the Magnitude squared value of the FVTOOL plot shows pi^2 instead of the saturated value 0.75^2 after fixed point conversion.

Answer 1

[MathWorks Support Team]

The ability to view filter coefficients in fixed-point format is not available in the Filter Design Toolbox when using the Filter Visualization Tool (FVTool).

As a workaround you can use the Filter Design and Analysis Tool (FDATool) to view fixed-point filters.