Transmission quality of digital audio teleconferencing bridge

A conference call can be set up by interconnecting the speech paths in a distributing network. The quality of conference speech is dependent on the circuit conditions and the speech leakage through the hybrids which convert the two wire paths into four wire paths and vice versa. In this paper we analyze the summing algorithm and extend previously published results. We also present a single speaker algorithm that is experimentally shown to be effective.