8/30/2023 0 Comments Digital bandpass filter design![]() In the sequel, fundamentals of VDFs are first reviewed. One of the famous applications is adaptive notch filters, which have been studied since the 1980s and the details will be reviewed in this chapter. Moreover, in the field of VDFs, application-oriented results have also been actively reported. Hence, research topics on VDFs as well as fixed characteristic filters are broadly classified into three categories : the approximation problem, the realization problem, and the implementation problem. The problems that should be solved in development of VDFs are essentially the same as those in digital filters of fixed characteristics. Among them, details of the results until the 1990s are widely reviewed in. Research on VDFs emerged in the 1970s and since then, many results have been reported. Such requirements can be fulfilled by means of variable digital filters (VDFs). In addition, many signal processing applications such as digital audio equipment and telecommunication systems sometimes require simultaneous realization of digital filtering and real-time control of filter characteristics. Digital filter is well known as one of the essential and fundamental components in signal processing devices.
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