Digital Expression

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Hertz

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Its a frequency unit from the international measuring system that equals the repetition of a phenomenon whose period is a second.

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Frequency

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The rate at which something occurs or is repeated over a particular period of time or in a given sample

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Echolocation

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Identify the intensity and length of the noise and they can then calculate the orientation and distance from the object

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Infrasound

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If the frequency is lower it is called infrasound and if it is higher it is called ultra sound

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Ultrasound

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If the frequency is lower it is called infrasound and if it is higher it is called ultrasound

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Sound

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“Vibrations that travel through the air or another means and can be heard when they reach a person’s or animal’s ear.” In a few words, it is the perception of fast variations of pressure in form of waves through an elastic means be it gaseous, liquid or solid.

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Elasticity

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Is the attribute of a material to recover its extension and shape at the moment a force that deforms it stops falling upon it.

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Acoustics

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Refers to the branch of physics concerned with the properties of sound.

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Transducer

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A transducer transforms a type of energy into another one, and it may work as a generator or as a receiver.

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Turning Fork

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On one end of it; when we hit the tuning fork, it will vibrate and create acoustic energy that will hit the molecules of air surrounding it, and it will produce a compression.

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Compression

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The molecules that were affected at the beginning by the acoustic energy due to the compression will successively hit the molecules around them to scatter somewhere else.

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Rarefaction

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When many molecules congregate in one place, they tend to scatter somewhere else. That is what we call rarefaction.

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Cycle

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It refers to the complete sequence of a periodic vibration that goes from rarefaction to compression.

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Period

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It is the time interval in which a cycle takes place.

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Sound Wave Frequency

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Sound Wave Frequency measured in Hertz (Hz) is the number of cycles that go through a same point during a second.

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Wavelength

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It refers to the distance that the sound goes through in a complete cycle of change in pressure. It is the physic measure of cycle length.

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Amplitude

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It refers to the distance between the equilibrium position and the maximum wave point.

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Tone

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It refers to the subjective perception of frequency.

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Decibel (dB)

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In order to measure volume subjectively, we use the unit called decibel (dB) which is a comparison measure between the minimum number humans are able to listen and the level we want to calculate.

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Absorption

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Part in which the acoustic energy is absorbed and transformed into heat

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Reflection

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Change of trajectory of the acoustics energy´s direction when it crashes with an object

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Refraction

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Change of direction in the sound wave. Occurs because of a difference in the means of propagation due to the density of the materials

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Bitrate

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Quality of compression (kilobytes, Kbps)

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Codecs

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Encoders and compressor - decompressor. Algorithm used for encoding the information of a sound on a digital file.

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Wrappers

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Way of organizing information related to the digital audio.

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WAV

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Digital audio format that doesn´t need compression.

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AIFF

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Audio Interchange File Format Audio format used in computers to save audios.

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CDA

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Virtual file to reproduce sound

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MP3

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ENCODING FORMAT FOR DIGITAL AUDIO WHICH USES A FORM OF LOSSY DATA COMPRESSION

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AAC

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Digital audio compression format with better sound quality.

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MIDI

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Musical Instrument Digital Interface Communication protocol that allows electronic musical instruments, synthesizers, computers, etc to communicate among them

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Audacity

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Main audio editing software.

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Garage Band

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Not professional application to edit sound

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Monaural Sound

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It is given when an audio is stored in one single channel and it lacks spatial sensation.

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Stereophonic Sound

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It is stored in two channels that can be reproduced in different loudspeakers and simulate the sensation of listening on one single side.

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Surround Sound

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It stores the information in more channels that are located around us.

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Streaming

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Reproduction of audio and video files with no need to be downloaded to a device.