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Unformatted text preview: Matlab Ripple Overview In many of the projects, it may be helpful to use M ATLAB s order estimation functions (e.g. buttord , cheb1ord , ...). Another alternative is M ATLAB 's fdatool , an interesting tool which can read your input specifications and design and plot filters, all in a graphical user interface environment. Either the script- based method or the graphical method may be preferable depending on your needs. A major cautionary note is in order: there is a difference in the specification definitions for IIR and FIR filters, for example in the definitions used by fdatool . This difference is due to historical reasons. Analog filter design techniques were developed in the early 1900s based on passive electrical networks, before gain was readily available. Many IIR filter design techniques are based on passive analog designs, so for IIR filters the definitions of the specifications do not include gain. However, FIR filters were developed exclusively in the context of digital filtering and the specification definitions include gain. In developed exclusively in the context of digital filtering and the specification definitions include gain....
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