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YAPAY SİNİR AĞLARI YARDIMIYLA MODELLENEN PENCERE FONKSİYONU KULLANARAK FIR FİLTRE TASARIMI

DESIGN OF FIR FILTER USING MODELED WINDOW FUNCTION WITH HELPING OF ARTIFICIAL NEURAL NETWORKS

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study the process of modeling a window function having useful spectral parameter preferred at many application area has been presented. The aim of this study is to implement designing a useful window function containing good properties of Kaiser and Ultraspherical windows widely used in literature. While Kaiser window can control mainlobe width and ripple ration characteristic but it cannot control the sidelobe roll-off ratio. The three-parameter ultraspherical window provides a much better sidelobe roll-off ratio characteristic than other windows in literature. At work, the design of a new window function that has side-lobe roll-off ratio characteristic of ultraspherical window and Kaiser window’s main-lobe width and ripple ratio was obtained by helping of ANN (Artificial Neural Networks). The window obtained from the improved method was used at FIR (Finite Impulse Response) filter design. Thus it was provided to show better properties of the filter designed with window having useful spectral parameters.
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Abstract (Original Language): 
Bu çalışmada pek çok uygulama alanında tercih edilen kullanışlı spektral parametreli pencere fonksiyonunun modellenmesi işlemi gerçekleştirilmiştir. Çalışmamızın amacı, literatürde yaygın olarak kullanılan Kaiser penceresi ve ultraspherical pencere fonksiyonlarının iyi özelliklerini bir arada bulunduran kullanışlı bir pencere fonksiyonunun tasarımını gerçekleştirmektir. Kaiser penceresi, analob genişliği ve dalgalanma oranı karakteristiğinin kontrolünü sağlarken, yanlob azalma oranının kontrolünü yapamamaktadır. Üç parametreli ultraspherical penceresi, literatürdeki diğer pencerelerden çok daha iyi yanlob azalma oranı karakteristiği sağlamaktadır. Bu çalışmada, Kaiser penceresinin analob genişliği ve dalgalanma oranı ile ultraspherical penceresinin yanlob azalma oranı karakteristiğine sahip yeni bir pencere fonksiyonunun tasarımı YSA (Yapay Sinir Ağları) yardımıyla elde edilmiştir. Geliştirilen yöntemden elde edilen pencere FIR (Finite Impulse Response, Sonlu İmpuls Cevaplı) filtre tasarımında kullanılmıştır. Böylece, kullanışlı spektral parametrelere sahip pencere ile tasarlanan filtrenin daha iyi davranış göstermesi sağlanmıştır.
FULL TEXT (PDF): 
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  • Turkish

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