Echo: The effect of a sound and a delayed version of that same sound. A 'Slap-Back Echo' is the original sound plus a single repeat; 'Multiple Echo' is the original sound plus several repeats with the identical delay spacing and decay times.

 

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Echo: The effect of a sound and a delayed version of that same sound. A 'Slap-Back Echo' is the original sound plus a single repeat; 'Multiple Echo' is the original sound plus several repeats with . . . View Full Definition

Line Echo Wave Pattern (LEWP): A wave-shaped bulge in a line of thunderstorms. It may often be seen as a 'S'-shaped radar echo signature and is often associated with severe weather.

Anechoic Chamber: A special room that is constructed without acoustically reflective surfaces, such that it is without echoes, or an-echo-ic. This experimental setup enables engineers to more precisely measur . . . View Full Definition

Clear-Air Echos: Radar returns from cloud- and precipitation-free (optical clear) air. Clear-air echos are caused by bragg scatter and insects. Bragg scatter comes from small-scale fluctuations of the refrac . . . View Full Definition

Bow Echo: A radar echo signature often associated with severe thunderstorms, especially those that produce wind damage. It is bent outward in a 'bow' shape.

Echo Box Performance Monitor: An accessory which is used for tuning the radar receiver and checking overall performance by visual inspection. An artificial echo as received from the echo box will appear as a narrow plume . . . View Full Definition

Hook Echo: A radar reflectivity pattern observed in a thunderstorm, appearing like a fish hook and indicating favorable conditions for tornadic development. However, hook echoes and tornadoes do not al . . . View Full Definition

Echopraxia: Repetition by imitation of the movements of another. The action is not a willed or voluntary one and has a semiautomatic and uncontrollable quality.

Echolalia: automatic imitation of anothers speech.

Echostar: The company that owns and operates DISH Network.