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| R2012a Documentation → Communications System Toolbox | |
Learn more about Communications System Toolbox |
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y = filter(b,a,x)
[y,zf] = filter(b,a,x)
y = filter(b,a,x) filters the data in the vector x with the filter described by numerator coefficient vector b and denominator coefficient vector a. The vectors b, a, and x must be Galois vectors in the same field. If a(1) is not equal to 1, filter normalizes the filter coefficients by a(1). As a result, a(1) must be nonzero.
The filter is a "Direct Form II Transposed" implementation of the standard difference equation below.
a(1)*y(n) = b(1)*x(n) + b(2)*x(n-1) + ... + b(nb+1)*x(n-nb) ... - a(2)*y(n-1) - ... - a(na+1)*y(n-na)
[y,zf] = filter(b,a,x) returns the final conditions of the filter delays in the Galois vector zf. The length of the vector zf is max(size(a),size(b))-1.
An example is in Huffman Coding.
Learn how to apply early verification to your development process through these technical resources.
How much time do you spend on testing to ensure implementation meets system-level requirements?
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