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Ultrasound is a sound with a frequency greater than that which the ear of a human being can perceive, approximately 20,000 Hz. Some animals, like dogs, dolphins and bats, have an upper limit of sound perception by the human ear and can therefore hear ultrasound. There are “whistles” special on these frequencies that serve these principles. A sound is characterized by vibrations (pressure variation) in the air. The average normal human being can tell, or hear sounds in the frequency range that extends from about 20Hz to 20,000 Hz. Above this interval, the signals are known as ultrasound and below it, Infrasound.

The sound output in stereo, is the speaker. A speaker cone driven by a coil immersed in a magnetic field produced by a magnet permanent. This cone can “vibrate” the audio frequencies and thus promoting boost air pressure waves that reach to the human ear, are interpreted as sound signals. However, as the frequency of vibrations increases, the amplitude of vibration will be reduced. To generate high-frequency sounds and ultrasounds are often used ceramic or piezoelectric crystals, which produce mechanical vibrations in response to electrical impulses. If you are interested to be ultrasound technician, visit the ultrasound technician schools website

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