The point where there is a lot of multiple echo and you have reached the threshold of visibility in a DTV signal is called

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The "cliff effect" refers to the phenomenon in digital television (DTV) broadcasting where the signal quality remains high and unchanged until it reaches a certain threshold (the "cliff"), beyond which the signal quality degrades rapidly, resulting in a sudden loss of picture and sound. This contrasts with analog signals, which degrade gradually.

The Point Where There Is a Lot of Multiple Echo