Çeyrek ayna süzgeç bankası tasarımında Kaiser-Hamming penceresinin performansının incelenmesi

Yıl 2019, Cilt: 25 Sayı: 2, 165 - 173, 22.04.2019

Bircan Kamışlıoğlu Nurhan Karaboğa

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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