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Appendix G. Echo Illustration

A clear message (signal) will be distorted if there are any reflections from the end of the transmission line. One solution to the reflection problem is to slow down the message (slow down the rise time of the signal). UltraCAD has placed three audio files on its Web site that illustrate these points. The first, testwave1.wav, is a simple phrase. The second, testwave2.wav, is the same phrase with considerable (admittedly forced) echoes (reflections) added. The third, testwave3.wav, is the same expression with the same echoes, but the phrase is spoken more slowly.

The three files illustrate how reflections can obscure a message, and how slowing down the message can help improve the receiver’s ability to understand it. The three files can be found at:


  

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