Restoration of Clipped Audio Signals

Öz

Restoration process is performed to remove degradations formed on the audio signals. In the restoration of clipped audio signals, which is one of these degradations, the degraded section is aimed to be restored to its original by the part of the undegraded section of the signal. The transformation of the signal from as normally given or recorded in the time domain to a different domain and thus reducing the number of samples required to be represented might be possible due to sparse representation. In this study, a restoration method is presented that relies on sparse representation of the discrete Fourier transform coefficients of the signal. In order to evaluate the performance of the proposed method, experiments were performed on various speech and music signal examples. It has been shown that the proposed method achieves better signal to noise ratio performance compared to the other methods in cases of higher clipping ratios.

Anahtar Kelimeler

• Audio restoration
• Clipping
• Sparse representation
• Optimization

KIRPILMIŞ SES İŞARETLERİNİN YENİLENMESİ

Öz

Ses işaretlerinde oluşan bozulmaların ortadan kaldırılması için yenileme işlemi yapılmaktadır. Bu bozulmalardan birisi olan kırpılmış ses işaretlerinin yenileme işleminde, işaretin bozulmamış bölgesindeki işaret parçası aracılığı ile işaretin bozulmaya uğramış bölgesinin özgün durumuna geri getirilmesi amaçlanmaktadır. İşaretin normal olarak verildiği ya da kayıt edildiği zaman ortamından farklı bir ortama dönüştürülmesi ve bu sayede temsil edilmesi için gerekli örnek sayısının azalması seyrek gösterim sayesinde mümkün olmaktadır. Bu çalışmada işaretin ayrık Fourier dönüşümü katsayılarının oluşturduğu seyrek gösterime dayanan bir yenileme yöntemi sunulmaktadır. Önerilen yöntemin başarımının değerlendirilmesi için farklı konuşma ve müzik işaretlerinden oluşan örnekler üzerinde çalışmalar yapılmıştır. Önerilen yöntemin işaretin daha yüksek oranda kırpılması durumunda karşılaştırılan diğer yöntemlere göre daha iyi işaret gürültü oranı başarımı elde ettiği gösterilmiştir.

Anahtar Kelimeler

• Ses yenileme
• Kırpılma
• Seyrek gösterim
• Eniyileme

Kaynakça

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