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Design Method for Variable FIR Digital Filters with Some Variable Parameters Using WLS
Toma Miyata,Naoyuki Aikawa 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In the field of measurement signal processing, we should often change the characteristic of the stopband instantaneously. Such the filter that can change the frequency response instantaneously is called variable digital filters (VDFs). In this paper, we propose a design method of FIR VDFs with some variable parameters. The filter with the quasi-chebyshev characteristic is obtained by using an iterative weighted least square (WLS) method. Moreover, a memory required for the designing filter coefficients in the proposed method is less than that of the conventional method using SDP. The usefulness of the proposed design method is verified through some examples.