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I'm breaking head on telephone encryption in local loop. The local loop has only one pair of conductors forming a current loop. The telephone system works in full duplex mode. I fail to understand how it separates incoming and outgoing speech from the voice modulated current stream.
Thanks...
Re: Question about dB
In 10×log(A), the A is the power gain. Since power is proportional to square of the voltage so it becomes 20×log(V),where V is voltage gain.
Hope you got the point.
pardeep
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