n = order(hq) returns the order n of the quantized filter hq. When hq is a single-section filter, n is the number of delays required for a minimum realization of the filter.

When hq has more than one section, n is the number of delays required for a minimum realization of the overall filter.

Examples

Create a discrete-time filter. Quantize the filter and convert to second-order section form. Then use order to check the order of the filter.

[b,a] = ellip(4,3,20,.6); % Create the reference filter.
hq = dfilt.df2(b,a);
% Quantize the filter and convert to second-order sections.
set(hq,'arithmetic','fixed');

n=order(hq) % Check the order of the overall filter.
n = 4

nstates

parallel

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