Frequency profile sensitivity based perceptual acoustic echo cancellation

• Main Authors: Chuang, Wei-Lun, 莊瑋倫
• Other Authors: Chi, Tai-Shih
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/34366354100136826974

碩士 === 國立交通大學 === 電信工程研究所 === 100 === Conventional acoustic echo cancellers are developed and evaluated using mathematical perspective performance measures. They are seldom evaluated from perception viewpoints by assessing the perceived residual echo. In addition to the fact that human hearing possesses different sensitivity to different frequencies, our brain analyzes sounds in terms of their spectro-temporal modulation contents. This spectro-temporal modulation filtering concept has been successfully used in many speech-related applications, such as noise reduction, voice activity detection and speech intelligibility assessment. In this thesis, we design a two-stage pre-emphasis filter based on hearing thresholds and detection thresholds of the spectral modulation transfer function for NLMS acoustic echo cancellers. The Aachen impulse response (AIR) database and TIMIT corpus are used to simulate real acoustic echo environments. Listening tests show that our design, which increases the convergent rates in those hearing-sensitive frequency bands and spectral modulation bands, effectively reduces the perceived residual echo produced by echo cancellers during their convergence.