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Experimental speakerphone system for teleconferencinga)

 

作者: J. E. West,   D. J. MacLean,   J. R. Nelson,   J. L. Flanagan,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1978)
卷期: Volume 64, issue 6  

页码: 1561-1565

 

ISSN:0001-4966

 

年代: 1978

 

DOI:10.1121/1.382138

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

Travel to distant conferences consumes time, energy, and human resources. An alternative, should it prove an adequate replacement for face‐to‐face communication, is ’’teleconferencing.’’ While the necessary and desirable elements of conferencing by telephone are yet to be quantified, we describe a rudimentary experimental system which provides a communication versatility that belies its simplicity. We establish a dedicated 4‐wire connection between distant conference rooms. We modify conventional speakerphones (Model 4A) by disconnecting the electronic hybrid to give separate transmit (microphone) and receive (loudspeaker) leads. We give each conferee an individual instrument. In a given conference room, we sum the signals from individual transmit leads and connect the results to the transmit path of the 4‐wire circuit. Similarly, we distribute the receive path of the 4‐wire connection to the individual receive leads. The voice operated attenuator (variolosser) and the noise‐operated gain‐adjusting device (NOGAD) in each individual speakerphone are left completely intact. Complementary connections are made in the other conference room. As a result of these features, the teleconferencing system is able to provide effective, interactive conferencing among large groups of users. Because of the distributed configuration of transmitters and receivers, it copes well with room reverberation and background noise.

 

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