Üstel pencere ailesi tabanlı yeni M-kanallı kosinüs modüleli tekdüze süzgeç öbeklerinin tasarımı, analizi ve EKG altbant işleme uygulaması

Öz

Bu çalışmada, M-kanallı kosinüs modüleli süzgeç öbeklerinin tasarımı için yeni bir yöntem sunulmaktadır. Önerilen bu yöntemde, süzgeç öbeklerinin prototip FIR (Sonlu Dürtü Yanıtlı) süzgeç tasarımı için iki bağımsız parametreli üstel pencere ailesi kullanılmıştır. Süzgeç öbeklerinin tasarımında oluşan genlik ve örtüşme hatalarını minimize etmek için, kesim frekansını optimize eden hızlı ve basit bir amaç fonksiyonu kullanılmıştır. Önerilen sistemin performansı farklı kanal sayıları, minimum durdurma bandı zayıflatmaları ve süzgeç uzunlukları için tasarımlar yaparak genlik ve örtüşme hataları cinsinden analiz edilmiştir. Sonra, pratik tasarım örneği olarak, önerilen yöntem kullanarak ses kodlayıcılarında kullanılan süzgeç öbeğine yakın 32 kanallı ve 100 dB durdurma bandı zayıflatmasına sahip bir kosinüs modüleli süzgeç öbeği tasarlanmış ve Kaiser penceresi tabanlı Lin yöntemiyle kıyaslanmıştır. Bununla birlikte, genlik ve örtüşme hataları cinsinden farklı kanal sayıları, minimum durdurma bandı zayıflatmaları ve süzgeç uzunluklarında önerilen yöntem ve Lin yöntemiyle tasarlanan süzgeç öbekleri kıyaslanmıştır. Son olarak önerilen yöntem ve Lin yöntemiyle tasarlanan süzgeç öbeklerinin farklı EKG sinyallerinin altbant işleme uygulamasındaki performansları incelenmiştir. Benzetim sonuçları, üstel pencere tabanlı önerilen yöntemle oluşturulan süzgeç öbeklerinin genlik ve örtüşme hataları cinsinden Kaiser penceresi tabanlı Lin yöntemiyle tasarlanan süzgeç öbeklerine göre daha iyi performans sergileyebileceğini göstermiştir. 

Anahtar Kelimeler

• Çoklu oranlı sinyal işleme,kosinüs modüleli süzgeç öbeği,Lin yöntemi,Üstel pencere,Kaiser penceresi

Kaynakça

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