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A perceptual Post Filter for Wideband Speech and Audio ACELP Codecs

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In this paper, a novel post filtering method is proposed to improve the perceptual quality of wideband speech and audio Algebraic Code Excited Linear Prediction (ACELP) codecs (such as the ITU-G722.2 AMR-WB). This perceptual processing is derived from the characteristics of the human hearing system. Based on these characteristics and more specifically on the analysis of the perceptual loudness difference between the original and the coded signal, it is proposed to add a post filter to reduce the perception of the coding noise. Simulation results show that the objective assessment scores obtained using wideband Perceptual Evaluation of Speech Quality (w-PESQ) can be improved significantly using the proposed method, especially for wideband female speech.

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