echo cancellation
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echo cancellation

The elimination of an echo in a two-way voice transmission. Echo is created in the telephone company's central office switch when two-wire lines from the customer are converted to four-wire lines for backbone trunks. The echo is exacerbated over longer distances and by certain kinds of network equipment. A delay of 30ms or more is noticeable, and 50ms is annoying. To eliminate it, the carriers put echo cancellers on their switch ports and in their long-distance trunks at 500 mile intervals.

Using sophisticated DSP circuits that isolate the echo and transmit a reverse frequency to cancel it, echo cancellation is also built into analog modems, speakerphones and quality sound cards. See echo suppression and noise cancellation.

echo cancellation - A process which removes unwanted echoes from the signal on a telephone line. Echoes are usually caused by impedance mismatches along an analogue line.

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No references found			GL Communications has introduced its new and enhanced echo canceller testing tools, which were designed to enable communications carriers and equipment manufacturers to improve the voice quality of wireline and wireless networks. GL Communications enhances echo canceller tests. (New Products) by Customer Interaction Solutions The SX-24 can be mounted in an adapter card that allows customers simply to remove a number of older-generation echo canceller cards (from Ditech and other vendors) that fail to provide additional voice enhancement features and plug-in the new SX-24 card with VQoS. DITECH COMMUNICATIONS ANNOUNCES SX-24 AND SX-30 ECHO CANCELLER by EDP Weekly's IT Monitor Expanded Product Line Includes New Telephony Interface Cards and High Performance Software Based Echo Canceller HUNTSVILLE, Ala. Digium Introduces New Technologies to Enhance Voice Quality and ... by Business Wire			Echinopsilon echinopsine Echinosoricinae Echinosteliaceae Echinosteliales echinostome cercaria Echinothuriidae Echinothurioida Echinozoa Echinuriasis echinus echinus and astragal Echis Echium Echiurida Echiuridae Echiuroidea Echiuroinea Echmiadzin Echo echo amplitude echo area echo attenuation echo box echo cancellation Echo canceller Echo Canyon State Park echo chamber echo check echo contour echo frequency echo intensity Echo Lake State Park echo matching echo power echo pulse echo ranging echo recognition echo repeater echo signal echo sounder echo sounding echo suppression echo suppressor echo talker echo-ranging sonar echo-splitting radar Echocardiography echoencephalograph Echoencephalography echogram			Echo (computing) Echo (mythology) Echo Alpha Yankee Zulu Echo Amphitheater echo amplitude Echo and the Bunnymen echo area echo attenuation Echo Award Echo Awards echo back to Echo Bay Mines Limited echo beat echo beat echo beat echo beat echo boomers echo box Echo Bridge Entertainment Echo Bubble Echo Bubbles Echo Canceler Echo Canceler Demand & Facility System Echo Canceler Method Echo cancellation Echo cancellation Echo Cancellation Equipment Echo Cancellation Technique Echo canceller Echo Canceller Controller Echo Canyon State Park Echo cardiogram Echo cardiogram Echo cardiogram echo chamber echo chamber echo chamber Echo Chamber Project echo chambers echo chambers echo chambers Echo Channel echo check echo check echo contour Echo Control echo diplacusis echo diplacusis Echo Dogs White Shepherd Rescue Echo Doppler Color Flow Echo Doppler studies Echo Doppler studies Echo Doppler studies echo frequency Echo generation Echo Hill Campership Fund Echo Hill Outdoor School Echo Hills Kennel Club echo home

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echo cancellation (redirected from Echo canceller)

echo cancellation
(redirected from Echo canceller)