What is echo?

What Does echo Mean

The echo is the repetition of a sound by an acoustic phenomenon that consists of the reflection of the sound wave on a hard body. Once reflected, the sound returns to the place of origin with a certain delay and, in this way, the ear distinguishes it as another independent sound.

The minimum delay required for this phenomenon to occur varies depending on the type of sound. In cases where the sound is so distorted that it becomes unrecognizable, it is called reverb .
For example: "The echo of his voice in the cathedral made it difficult to understand the songs" , "On vacation I went to the mountains with my parents and we played with the echo that was generated when shouting on the cliffs" , "I need you to come down the volume of the television as the telephone echoes ” .

This acoustic phenomenon also allows us to use the concept of echo (which comes from the Latin echo ) in a symbolic way. In this way, the person who repeats what another says is also known as an echo, like the sayings that are markedly influenced by an antecedent: “He wants to present himself as a novel candidate, but he is nothing more than the echo of the old political leader. of the people ” , “ I ask you to mark my mistakes, not to be my echo and join in everything I say ” .
The faintly perceived sound, the vague rumor of an event and the impact of a news item are other ideas that can be expressed through the notion of echo: "The echo of the player's statements reached the club and sparked controversy" , "The echo of the bombs is heard throughout the region . "
Echolocation
Also known as echolocation , echolocation is a mechanism used by some animal species for the purpose of detecting objects around them. Basically, it consists of the emission of sounds and the subsequent analysis of their echoes. It should be mentioned that unlike sonar, developed for the assistance of navigators, animals have several receptors.
Mammals that use echolocation include bats (with some exceptions), sperm whales, and dolphins. With regard to the oviparous, we can mention the guácharos (also known as cave birds ), the salanganas and the swifts. Some scientists have tried to prove that humans also possess this ability to some extent, but no one has yet presented irrefutable evidence.
By means of the interpretation of the echo, the animals are able to measure the distance at which they are from the detected objects, taking as a fundamental data the delay time of the sound. Furthermore, the fact that each ear perceives the echo at different times, with a different intensity and frequency, allows the recreation of the size and certain characteristics of the elements, more complex than their mere position.

Despite what many think, bats have a sense of sight, and some use it to navigate and hunt during the day, reserving echolocation for flights in absolute darkness . In these cases, in addition to detecting their prey, they use this resource to avoid dangers such as areas inhabited by predators and to find a source of insects that has not been found by many hunters.
Ultrasound is generated in the larynx and emitted through the mouth or nose, to form a call whose frequency range goes from 14,000 to 100,000 Hz, 80,000 Hz above the limits of our auditory perception. On the other hand, these same animals are capable of producing sounds of considerably low frequencies, reaching 10 Hz.

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