Abstract
In this paper, we have analyzed the performance of modified Cosh window function.A new parameter has been proposed to the previous 2-parameter Cosh window to improve its spectral characteristics in terms of ripple-ratio and transition width.It is observed by several iterations that by increasing the values of new parameter so proposed there is a significant variation in ripple ratio and transition width of the window spectrum.By the suitable combination of two parameters of the proposed window function, an optimum modified Cosh window is derived for N=51 and N=101.Optimum window provides better spectral characteristics. This modified window has applications in digital FIR designing, image processing as it provides better minimum stop band attenuation and contrast ratio respectively.An example has been taken to show the better performance of the proposed window for FIR filter designing for specified requirements.
Highlights
Electronic filters are electronic circuits which perform signal processing functions, to remove unwanted frequency components from the signal
The covered work was done on studying and analyzing the proposed window performance on varying its parameters.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
In the result and discussion part, various plots are discussed related to modified Cosh window function in time and frequency domain and its dependence on parameters
Summary
Electronic filters are electronic circuits which perform signal processing functions, to remove unwanted frequency components from the signal. Digital filters are classified as finite impulse response (FIR) and infinite impulse response (IIR) filters based on the duration of their impulse response. Window functions are widely used to truncate the infinite response of a filter to make the filter realizable. Various window functions have been proposed in literature. Due to the flexible spectral properties of windows various windows like Dolph-Chebyshev, Kaiser, Barlett etc. Have been proposed for signal processing applications. Cosh window when modified by introducing a new parameter, performs better in terms of ripple ratio. It provides better MSA as compared to Kaiser window, Cosh window, Exponential window in FIR filter designing [14]
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