AES E-Library

A perceptual Post Filter for Wideband Speech and Audio ACELP Codecs

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.

Authors: Bouchard, Martin; Shao, Cathy
Affiliation: University of Ottawa
AES Convention:118 (May 2005) Paper Number:6379 Import into BibTeX
Subject:Low Bit Rate Coding

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD 118Papers)   /118/6379.pdf

Start a discussion about this paper!