Programmable audio mixer

Details Programmable audio mixer Programmable audio mixer

1983-10-25

1985-12-10

Brown, Thomas W.

Multiplex communications

Wide area network

Packet switching

370 62, H04M 356, H04Q 1104

Patent

active

045581800

ABSTRACT:
Audio mixes for a plurality of conference locations are controllably obtained by using a matrix multiplication arrangement. The audio mixes for the individual conference locations are obtained by multiplying a dynamically determined gain matrix by an audio input matrix. Coefficient values in the gain matrix are dependent on whether incoming and outgoing transmission paths are assigned to a location and on whether an audio sample is being received or not.

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patent: 4054908 (1977-10-01), Poirier et al.
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patent: 4360827 (1982-11-01), Braun
patent: 4389720 (1983-06-01), Baxter et al.
patent: 4449238 (1984-05-01), Lee et al.
"Optical Fibres in Subscriber Loop Networks", R. Francois et al., Commutation & Transmission, No. 2/3, 1982, (Paris, France), pp. 119-136.
"Teleconferencing", IEEE 1981 Conference on Communications, vol. 2, pp. 31.2.1-31.2.4, Jun. 1981, by David W. Kennett.
Bernard A. Wright, "The Design of PICTUREPHONE.RTM. Meeting Service (PMS) Conference Centers for Video Teleconferencing", IEEE Communications Magazine, pp. 30-36, Mar. 1983.
Audrey J. Kames and W. Gordon Heffron, "Human Factors Design of PICTUREPHONE.RTM. Meeting Service", GLOBECOM '82 Conference Record, vol. 3, pp. 976-981, 1982.

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