What filter command is actually doing
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When i use filter command
y=filter(filnum, filden, x);
it filters the data in vector x with the filter described by vectors filnum and filden to create the filtered data Y.
I can also say that it convolves the signal x with the filter defined by fulnum and filden
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Wayne King
am 4 Nov. 2011
Hi, yes filter() is convolution.
filter() actually uses what is called a direct-form II transposed structure to implement the convolution.
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Wayne King
am 4 Nov. 2011
I think detection by using the DFT is the way to go. I understand the exercise you were working on, but I think most real-world algorithms use the DFT. Look at that demo in the Signal Processing Toolbox that uses the Goertzel algorithm for the DFT at a small set of frequencies.
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