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RE: Questions

Posted by GGA (A) on February 12, 2008 at 18:14:17

In Reply to: RE: Questions posted by Charles Hansen on February 11, 2008 at 20:01:54:

If you were 30 feet from a magical wall that had the exact same impedance as the air, it would absorb the sound and you wouldn't hear any echo. Terminating a cable with an impedance that matches the cable's impedance does the same thing. The signal travels down the cable and is absorbed completely and won't reflect back. So there only has to be perfect absorption at one end or the other to avoid problems whereby the receiver receives multiple pulses when there should just be one pulse.


With the echo I assume the sound is being converted to heat/vibration when it is being absorbed in the wall. Is there an analogy for when a cable sees a matching impedance of how the signal is being absorbed? Perhaps absorbed is not the right word? Perhaps "complete transmission" would be better? If the impedance of the wall and the air were the same wouldn't the sound just pass through the wall?

But if the cable is 20 or 30 feet long, the reflection will arrive long after the transition and not cause so many problems.

Couldn't the reflection interfere with the next or some following transition rather than the original transition?

I appreciate the time you take to answer these theoretical questions. I actually find them very interesting.

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The Cable Cooker

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