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Unformatted text preview: Testing a “Folk Theorem” Overview One area in which discrete-time signal processing has enjoyed widespread use is in the field of speech processing. In this project we consider various issues relating to applying digital filtering to speech. Specifically, in this project, we consider the effect of all-pass filtering on speech. Historically, DSP courses have put considerable emphasis on design techniques for both I IR and FIR filters, as discussed in Chapter 7 of the course text. A variety of filter design algorithms are now implemented in common software packages such as fdatool in M ATLAB . This makes it unnecessary for most practitioners to learn the details of the design algorithms; however, ceding the design function to a software package makes it more important to understand the properties of different types of optimal filters, the meanings of the design parameters, and some of the trade-offs between filter classes....
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