Çeyrek ayna süzgeç bankası tasarımında Kaiser-Hamming penceresinin performansının incelenmesi

Öz

Son yıllarda hızlı sayısal süzgeçler ve süzgeç bankalarında önemli gelişmeler olmuştur. Çoklu hıza sahip süzgeç bankalarının bir uygulaması olarak bilinen QMF (Çeyrek Ayna Süzgeç-Quadrature Mirror Filter) bankası alt bant kodlama, görüntü sıkıştırma, kelime kodlama, biyomedikal sinyal işleme ve haberleşme sistemlerinde yaygın olarak kullanılmaktadır. Bu çalışmada; QMF bankası tasarımında istenilmeyen salınımları ortadan kaldırmak için Kaiser ve Hamming pencerelerinin kaskat bağlanması ile elde edilen pencere fonksiyonu kullanılarak tasarlanan prototip FIR (Finite Impulse Response-Sonlu dürtü tepkili) süzgeçle QMF bankası tasarımı gerçekleştirilmiştir. Farklı pencere fonksiyonları ile tasarlanan süzgeçlerde süzgecin derecesinin performansı nasıl değiştirdiği incelenmiş ve sonuçta daha yüksek durdurma bandı zayıflaması sergileyen Kaiser-Hamming penceresinin QMF bankası tasarımında kullanılabileceği sonucuna varılmıştır. 

Anahtar Kelimeler

• FIR,QMF bankası,Pencereleme,Kaiser penceresi,Hamming penceresi,Kaiser-Hamming penceresi

Investigation of the performance of the Kaiser-Hamming window in design of QMF bank

Öz

In recent years, significant improvements have been in fast digital filters and filter banks. QMF (Quadrature Mirror Filter) bank, known as an application of multi-speed filter banks are widely used sub-band coding, image compression, word coding, biomedical signal processing and communication systems. In this study; QMF bank design is realized via a windowing method with prototype FIR (Finite Impulse Response) filter design and based on cascade bounded Kaiser and Hamming windows for eliminating undesired oscillations in QMF bank design. It has been investigated how the performance changed of the filter degree in designing filter with different window functions and at the result it is shown that Kaiser-Hamming window with lower stopband attenuation could be used in QMF bank design.

Anahtar Kelimeler

• FIR QMF bank,Windowing,Kaiser window,Hamming window,Kaiser-Hamming window

Kaynakça

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