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"Sounding" derives from the Old English sund, meaning "swimming, water, sea"; it is not related to the word sound in the sense of noise or tones, [2] but to sound, a geographical term. Traditional terms for soundings are a source for common expressions in the English language, notably "deep six" (a sounding of 6 fathoms).
The following is the chart of the International Phonetic Alphabet, a standardized system of phonetic symbols devised and maintained by the International Phonetic Association. It is not a complete list of all possible speech sounds in the world's languages, only those about which stand-alone articles exist in this encyclopedia.
Within the chart “close”, “open”, “mid”, “front”, “central”, and “back” refer to the placement of the sound within the mouth. [ 3 ] At points where two sounds share an intersection, the left is unrounded, and the right is rounded which refers to the shape of the lips while making the sound. [ 4 ]
[note 2] For example, the sound (the sh in shoe) was originally represented with the letter c for English but with x for French and German; with German, c was used for the sound of Bach. [6]
The first research on the topic of how the ear hears different frequencies at different levels was conducted by Fletcher and Munson in 1933. Until recently, it was common to see the term Fletcher–Munson used to refer to equal-loudness contours generally, even though a re-determination was carried out by Robinson and Dadson in 1956, which became the basis for an ISO 226 standard.
The charts below show the way in which the International Phonetic Alphabet (IPA) represents Classical Latin and Ecclesiastical Latin pronunciations in Wikipedia articles. For a guide to adding IPA characters to Wikipedia articles, see Template:IPA and Wikipedia:Manual of Style/Pronunciation § Entering IPA characters.
The SOFAR channel (short for sound fixing and ranging channel), or deep sound channel (DSC), [1] is a horizontal layer of water in the ocean at which depth the speed of sound is at its minimum. The SOFAR channel acts as a waveguide for sound, and low frequency sound waves within the channel may travel thousands of miles before dissipating.
Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...