G.723.1
and G.729 Speech Transmission over Wireless and Internet Environments
Abstract
G.723.1
and G.729 are both ITU-T speech coding standards. These two speech coders are
designed for the compression of speech and audio signals in multimedia
applications. The target applications are the voice transmission over Internet
and the voice coding of H.323 based Internet video conferences.
To
enhance the error robustness of G.729, we propose an error protection scheme by
applying BCH(31, 26) to protect significant bits in a frame. Furthermore, the
BCH(31, 26) scheme is compatible to G.729 standard. In Internet environment, the
packets often get lost and the error propagation effect degrades the speech
quality substantially. Therefore, we apply the error concealment techniques to
both G.729 and G.723.1. In simulations, the objective and subjective evaluation
tests all show that the G.729 BCH(31, 26) error protect scheme and the error
concealment techniques of G.729 and G.723.1 can improve speech quality
significantly.