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Fir filter design (windowing technique)

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Fir filter design (windowing technique)

  1. 1. FIR Filter Design (WindowingTechnique)The basic idea behind the window design is to choose a properideal frequency-selective filter (which always has a noncausal,infinite-duration impulse response) and then to truncate (orwindow) its impulse response to obtain a linear-phase and causalFIR filter.Therefore the emphasis in this method is on selecting anappropriate windowing function and an appropriate ideal filter. Wewill denote an ideal frequency-selective filter by ,which hasa unity magnitude gain and linear-phase characteristics over itspassband, and zero response over its stopband.( )jdH e 
  2. 2. The impulse response will be
  3. 3. • jjkjjkjkjThis multiplication in time domain impliesconvolution in frequency domain. Because it is oneof the properties of DTFT, DFT or Z-Transform
  4. 4. Commonly used windows
  5. 5. Matlab Implimentation

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