Perceptual Acoustic Echo Suppressor for Audio Communication over Packet Networks

This paper presents an acoustic echo suppressor based on spectral subtraction that takes into account the perceptual effects of human hearing. This paper also propose here a method where the echo delay does not increase the computational cost. Effectively, in wireless system, it is not uncommon to have round trip delay up to 300 ms and even more. On most of echo cancellers, increasing the tail length makes the computation to increase. We will propose a method to have fixed computational cost whatever the echo delay is, based on the echo path delay estimation. Also, we will take into account all the perceptual effects (temporal post-masking, perceived echo versus end-to-end delay) that could improve the perceived voice quality