themaccabee
Full Member level 4
Hi,
Can someone tell me how old telephone systems transmit two way voice communication using 2 wires only??
while reading i came across the term hybrid and i think 2 way voice by two wire transmission was made becoz of this..
But i fail to understand the operation of hybrid can some body please explain...
I read Wikipedia it says
The fundamental principle is that of impedance matching. The send signal is applied to both the telephone line and a ‘balancing network’ that is designed to have the same impedance as the line. The receive signal is derived by subtracting the two, thus canceling the send audio. [1] Early hybrids were made with transformers configured as hybrid coils that had an extra winding that could be connected out of phase. The name ‘hybrid’ comes from these special mixed-winding transformers
But im totally lost here..(
I came across a figure in net too that shows a typical connection..but icant make out how this thing works
http://www.pixtick.com/uploads/themaccabee_1329393627918.jpg
Can someone tell me how old telephone systems transmit two way voice communication using 2 wires only??
while reading i came across the term hybrid and i think 2 way voice by two wire transmission was made becoz of this..
But i fail to understand the operation of hybrid can some body please explain...
I read Wikipedia it says
The fundamental principle is that of impedance matching. The send signal is applied to both the telephone line and a ‘balancing network’ that is designed to have the same impedance as the line. The receive signal is derived by subtracting the two, thus canceling the send audio. [1] Early hybrids were made with transformers configured as hybrid coils that had an extra winding that could be connected out of phase. The name ‘hybrid’ comes from these special mixed-winding transformers
But im totally lost here..(
I came across a figure in net too that shows a typical connection..but icant make out how this thing works
http://www.pixtick.com/uploads/themaccabee_1329393627918.jpg