[SI-LIST] Re: ECHO cancellation hybrid

Venu,

The transformer in a 2-4 wire hybrid just acts as a summing element with 
hopefully low distortion.  Ideally the termination network on the receive 
port terminates all of the energy propagating towards the LIU receive port 
which includes the far-end signal and about half of the transmit port 
output power.  So, the receive signal from the far-end doesn't reflect back 
up the line, and half the original transmit power propagates towards the 
far-end.  Now, all we have to do is subtract out the the same amount of the 
transmit signal image from the receive port signal as appears on that port.

Regards,


Steve.
At 03:26 AM 8/21/2003 -0700, venu wrote:
>hi all,
>Can anybody plz. explain me how an Echo cancellation hybrid
>works?
>I want to have an Echo cancellation hybrid for ISDN BRI line.
>I found one part with part number PE36005 suitable for my
>application as per datasheet of my LIU.
>But i can't understand how it works exactly.
>Can anybody plz. explain me how does it work?
>Thnx in advance,
>venu.
>
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