container : Array, predefined Array for holding results

The Filter( A, a, b ) command filters the signal (sample) in the array A using the IIR coefficients in the array a and the FIR coefficients in the array b. If b is omitted, no FIR filter is applied (there is only a single coefficient, 1).

Before the code performing the computation runs, the input Arrays are converted to datatype float[8] if they do not have that datatype already. For this reason, it is most efficient if the input Arrays have this datatype beforehand.

If the container=C option is provided, then the results are put into C and C is returned. With this option, no additional memory is allocated to store the result. The container must be an Array of size equal to the size of A and having datatype float[8].

The SignalProcessing[Filter] command is thread-safe as of Maple 17.

For more information on thread safety, see index/threadsafe.

$\mathrm{with}\left(\mathrm{SignalProcessing}\right)\:$

$\mathrm{with}\left(\mathrm{plots}\right)\:$

$A≔\mathrm{GenerateTone}\left(128\,1\,0.05\,3.0\right)\:$

$a≔\mathrm{Array}\left(1..3\,\left[\frac{1}{3}\,\frac{1}{3}\,\frac{1}{3}\right]\,\mathrm{datatype}=\mathrm{float}\left[8\right]\,\mathrm{order}=\mathrm{C\_order}\right)\:$

$b≔\mathrm{Array}\left(1..1\,\left[1\right]\,\mathrm{datatype}=\mathrm{float}\left[8\right]\,\mathrm{order}=\mathrm{C\_order}\right)\:$

$B≔\mathrm{Filter}\left(A\,a\,b\right)\:$

$\mathrm{display}\left(\mathrm{Array}\left(\left[\mathrm{SignalPlot}\left(A\right)\,\mathrm{SignalPlot}\left(B\right)\right]\right)\right)$

The SignalProcessing[Filter] command was introduced in Maple 17.

For more information on Maple 17 changes, see Updates in Maple 17.