Multiplex communications – Wide area network – Packet switching
Patent
1982-10-29
1985-02-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
179 18BC, H04M 356
Patent
active
044995784
ABSTRACT:
For use in multiport digital conference arrangements wherein speech samples of selected speakers are summed for distribution to the conferees, the disclosed method and apparatus controls the level of speech represented by information samples to be included in an output sample for distribution to the ports and equalizes the speech level between speakers to reduce speech level contrast heard by the conferees. In addition, a speech detector for each port and microprocessor-controlled switching hardware also adjust the signal level represented by samples received on the ports to effect speaker selection. Furthermore, gain coefficients for a port may be incrementally adjusted during a predetermined period of time to avoid noticeble signal level changes when implementing speaker selection.
REFERENCES:
patent: 4197429 (1980-04-01), Sparber
patent: 4268716 (1981-05-01), Groves et al.
patent: 4276639 (1981-06-01), Fukuda et al.
patent: 4316059 (1982-02-01), Toth
patent: 4325139 (1982-04-01), Van Dine
patent: 4359603 (1982-11-01), Heaton
patent: 4389720 (1983-06-01), Baxter et al.
Bell System Practices, AT&T Co. Standard, "Toll Conference Service Multiport Conference Bridge Description", Issue 1, pp. 1-13, May, 1969.
Marouf Mohamed A.
Vancil Paul W.
AT&T Bell Laboratories
Chin Wellington
Davis Charles H.
Godlewski Richard J.
Olms Douglas W.
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