echo canceler
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Echo suppressor — An echo suppressor (sometimes acoustic echo suppressor / AES) is a telecommunications device used to reduce the echo heard on long telephone circuits, particularly circuits that traverse satellite links. Echo suppressors were first developed in… … Wikipedia
canceler — noun Something that, or someone who cancels something; specifically an electronic device that cancels a signal. The echo canceler is basically an adaptive tapped delay line filter with near and far end sections … Wiktionary
Blue box (phreaking) — An early phreaking tool, the blue box is an electronic device that simulates a telephone operator s dialing console. It functions by replicating the tones used to switch long distance calls and using them to route the user s own call, bypassing… … Wikipedia
