Low delay MP3 Internet Telephony

The use of MP3 as a compression codec for Internet Telephony has become feasible in view of the latest developments in PC hardware and broadband Internet capacity. In this context, this paper examines the implementation details behind such an Internet telephone, measuring delay in the end hosts. A new approach to detecting and correcting audio skew is proposed and implemented, focusing on the accuracy of measurements and on the algorithm’s effect on the audio experience of the listener. The algorithms presented are shown to successfully remove audio skew, thus reducing delay and loss and hence improving audio quality. The feasibility of MP3 as a codec for Internet telephony is shown to be feasible and to work well within the required delay bounds. Key-words: MP3, Internet Telephony, VoIP, Audio Skew, Delay.