Digital voice switch for a multi-port conference circuit

Details Digital voice switch for a multi-port conference circuit Digital voice switch for a multi-port conference circuit

1987-12-28

1988-12-27

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

370 681, H04Q 1104

Patent

active

047945915

ABSTRACT:
An echo cancellation arrangement is provided for decreasing the "singing" of a connection of a large number of telephone subscribers in a conference calling arrangement. This arrangement includes a means for inserting quiet code during time when the voice samples of incoming PCM data are zero or below a predetermined minimum threshold level. This helps decrease the amount of feedback which is amplified and output through the codec/filter to the listeners through the PCM network. An attenuation arrangement is also included which decreases the level of a summed signal of a summing node of the conference circuit. This sum signal is the combination of each of the conferees' speech. Attenuation of this signal prohibits excessive coupling of amplified feedback to each of the listening conferees.

REFERENCES:
patent: 4741025 (1988-04-01), Maruyama et al.

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