Multiple access telephone extension systems and methods
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
Oct 7, 1991
filing date -
Oct 7, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and system for conducting multiple access simultaneous telephone communications in full duplex either over the power lines of a building or using RF transmission. It employs a combination of multiple access techniques selected from among the following: time division, code division, and frequency division. The following features result: a) security coding to prevent unauthorized access and eavesdropping, b) multiple simultaneous conversations through identical and closely coupled transmission media, c) non-interference to other communications systems and users, and d) processing gain for operating in noisy environments.
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