Echo target determination using acoustic round trip delay for voice over IP conferences

This paper proposes a method for determining acoustic echo cancellation targets by combining acoustic round trip delay data and psyche-acoustic echo target data. An accurate determination of echo targets is required to minimize detrimental switched-loss attenuation effects. The nonlinear processor (NLP) can use the proposed echo cancellation targets to lower the amount of switched-loss attenuation added by the echo suppression system. Lower levels of switched-loss attenuation increase the system gain and reduce unwanted half-duplex effects. Most voice over Internet protocol (VoIP) conferencing products can use the proposed echo suppression system because it is ITU-T H.323 compliant