I have designed and cascaded two multi-rate filters in FDATool and I would like to export the coefficients of an equivalent one-stage FIR filter.
The first stage is an FIR filter with 18 coefficients and a decimation by 2. The second stage is an FIR filter with 60 coefficients and another decimation by 2. When I combine them in FDATool, the resulting filter has 137 coefficients which doesn't make sense.
When I try to export the coefficients to the MATLAB Workspace as coefficients, I only get the coefficiencts of the two stages separately. How can I combine the two?
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