Packet Based Echo Cancellation for Voice Over Internet Protocol Simulated with Variable Amount of Network Delay Time

In today's modern telephony network, VoIP is fast emerging as one of the main communication technique. However, the performance and the quality of VoIP are affected by echo. Packet Based Echo Canceller (PBEC) is introduced, as a solution to cancel echo in the VoIP network. PBEC can replace the current echo cancellers, which are located in the Public Switched Telephony Network (PSTN) central switches. The operating principle of the PBEC is explained and its advantages are highlighted. Simulations have been done with variable amount of network delay using the PBEC and PSTN based echo cancellation system. The PBEC has performed better than the PSTN based echo cancellation system when simulated with variable amount of network delay time. The PBEC had a 2.25dB advantage over the PSTN based echo cancellation system when simulated with 400 ms of network delay time.