Abstract
In this study, 2-parameter cosh window is modified to improve its spectral characteristic in terms of the ripple ratio by proposing a new additional parameter. It is observed that an increase in the new parameter results in wider mainlobe width and smaller ripple ratio. By choosing the suitable combinations of the two adjustable parameters for the proposed modified window, the optimum windows that yield the minimum ripple ratio for N=51 and N=101 are .found. Simulation results show that the filters designed by proposed 3-parameter Cosh window provide higher quality in terms of the minimum stop-band attenuation for a fixed order, and yield lower order for a fix minimum stop-band attenuation compared to the filters designed by other windows.
Highlights
Digital filters are the most important and frequently used elements in digital signal processing applications
It is found that an increase in the new parameter results in wider main-lobe width and smaller ripple ratio
The performance is counted on the basis of its spectral characteristics which are Ripple ratio, Side-lobe Roll-off ratio and Transition Width
Summary
Digital filters are the most important and frequently used elements in digital signal processing applications These are classified as finite impulse response (FIR) and infinite impulse response (IIR) filters based on the duration of their impulse response. In this paper nonrecursive digital FIR filter design by 3-parameter Cosh window is proposed which provides better far-end stop-band attenuation than filter designed by well known Kaiser window which is the figure of merit. 2-parameter Cosh window is modified by introducing third parameter so as to provide a more flexible and useful window family for designing higher quality nonrecursive digital filters in terms of the minimum stopband attenuation, low filter order and more far-end stopband attenuation
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