Glossary CH3 Flashcards
(38 cards)
Hertz
Frequency unit from the international measuring system that equals the repetition of a phenomenon whose period is a second. It is abbreviated as Hz.
Frequency
It is the number of cycles that happen in a second.
Echolocation
It is the location of an object through the reflection of sound waves. It is used by some animal species such as bats, and cetaceans, and it may have technological applications such as the sonar system.
Infrasound
It is a sound whose vibration frequency is lower than the one which can be perceived by the human ear.
Ultrasound
It is the sound whose frequency of vibrations is superior to the highest limit perceived by the human ear. It has many industrial applications and it is also used in medicine.
Sound
It is the sensation produced in the hearing organ by the vibrational movement of the bodies that is transmitted through an elastic means.
Elasticity
It is the characteristic that a material has to recover its extension and shape when a force that deformed it stops being put on it.
Acoustics
It is a branch of physics that studies the sound production, transmission, storing, perception and reproduction.
Transducer
It is the equipment that transforms a type of energy into another one and may work as a recipient or as a generator.
Tuning Fork
It is a voice and instrument regulator that consists of a Steel sheet folded as a hook with a foot, and when it is hit, it presents 435 vibrations per second.
Compression
It is the effort that an object is subject to by the action of two opposing forces that tend to diminish its volume.
Rarefaction
It refers to making a gaseous body less dense.
Cycle
It is the complete sequence of a periodic vibration. It goes from rarefaction to compression.
Period
It is a period of time that happens in a cycle.
Sound Wave Frequency
Measured in Hertz (Hz) is the number of cycles that go through a same point during a second. In other words, it is the number of cycles per second.
Wavelength
It is the distance that the sound goes over in a complete cycle of change in pressure and it is the physical measure of a cycle’s length.
Amplitude
It is the distance between a balance point and the highest wave point.
Tone
It is the subjective perception of frequency. There are high tones and low tones. In order to measure them, we use hertz.
Decibel (dB)
It is a measuring unit that compares the minimum that human can hear (odB) against the level we want to measure.
Absorption
It is the process in which sound is absorbed by an object when crashing against it.
Reflection
It is the quantity of acoustic energy that will change directions when it crashes against the edge of an object.
Refraction
It is the change in direction of the sound wave due to a variation of the means of scattering.
Bitrate
It is the transmission rate. It refers to the number of bits that is transmitted in a unit of time, usually kilobits per second.
Codecs
It means order-decoder. It is software that consists on an algorithm to compress and decompress video in real time. Its use doesn’t interfere with the playing speed. There are also codecs for audio files.
