Audio basics

This post is a summary of the content that we have seen in class during the weeks devoted to audio in the workshop. Most of the content are linked to online content hosted on wikipedia, so it will be very easy for you to expand knowledge and fully understand all questions by selecting the preferred language.

 Sound is a mechanical that is an oscillation of pressure transmitted through a solid, liquid or gas, composed of frequencies within the range of hearing.
http://en.wikipedia.org/wiki/Sound
http://upload.wikimedia.org/wikipedia/commons/6/6d/Sine_waves_different_frequencies.svg

Hearing range usually describes the range of frequencies that can be heard by an animal or human, though it can also refer to the range of levels. In humans the audible range of frequencies is usually 20 to 20,000 Hz, although there is considerable variation between individuals, especially at high frequencies, where a gradual decline with age is considered normal.
http://en.wikipedia.org/wiki/Audible_range

Audio Frequencie http://en.wikipedia.org/wiki/Audio_frequency

 The decibel (dB) is a logarihm unit that indicates the ratio of a physical quantity relative to a specified or implied reference level.
http://www.cyberphysics.co.uk/graphics/diagrams/db_scale.gif

Tracks and Channels
Mono http://en.wikipedia.org/wiki/Monaural
Monaural or monophonic sound reproduction (often shortened to mono) is single-channel. Typically there is only one microphone, one loudspeaker, or (in the case of headphones and multiple loudspeakers) channels are fed from a common signal path. In the case of multiple microphones the paths are mixed into a single signal path at some stage

Stereo http://en.wikipedia.org/wiki/Stereo
Stereophonic sound or, more commonly, stereo, is a method of sound reproduction that creates an illusion of directionality and audible perspective. This is usually achieved by using two or more independent audio channels through a configuration of two or more loudspeakers in such a way as to create the impression of sound heard from various directions, as in natural hearing.[1] Thus the term “stereophonic” applies to so-called “quadraphonic” and “surround-sound” systems as well as the more common 2-channel, 2-speaker systems. It is often contrasted with monophonic, or “mono” sound, where audio is in the form of one channel, often centered in the sound field (analogous to a visual field). Stereo sound is now common in entertainment systems such as broadcast radio and TV, recorded music and the cinema. 

Surround Sound http://en.wikipedia.org/wiki/Surround_sound

This entry was posted in Uncategorized. Bookmark the permalink.

Leave a Reply