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An octave band is a frequency band that spans one octave (Play ⓘ).In this context an octave can be a factor of 2 [1] [full citation needed] or a factor of 10 0.301. [2] [full citation needed] [3] [full citation needed] An octave of 1200 cents in musical pitch (a logarithmic unit) corresponds to a frequency ratio of 2 / 1 ≈ 10 0.301.
A one-third octave is a logarithmic unit of frequency ratio equal to either one third of an octave (1200/3 = 400 cents: major third) or one tenth of a decade (3986.31/10 = 398.631 cents: M3 Play ⓘ). [1] An alternative (unambiguous) term for one tenth of a decade is a decidecade. [2] [3]
In music, an octave (Latin: octavus: eighth) or perfect octave (sometimes called the diapason) [2] is an interval between two notes, one having twice the frequency of vibration of the other. The octave relationship is a natural phenomenon that has been referred to as the "basic miracle of music", the use of which is "common in most musical ...
For example, the frequency one octave above 40 Hz is 80 Hz. The term is derived from the Western musical scale where an octave is a doubling in frequency. [note 1] Specification in terms of octaves is therefore common in audio electronics. Along with the decade, it is a unit used to describe frequency bands or frequency ratios. [1] [2]
Octave clef Treble and bass clefs can be modified by octave numbers. An "8" below the clef (as in the third diagram) indicates that pitches will sound an octave lower than they would with the unmodified clef. A "15" below indicates a two-octave shift. These numbers may also be used above the clef to indicate pitches one or two octaves higher.
The noise reduction coefficient is "a single-number rating, rounded to the nearest 0.05, of the sound absorption coefficients of a material for the four one-third octave bands at 250 Hz, 500 Hz, 1000 Hz and 2000 Hz". [4]
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A style of composition in which two sections of singers or instrumentalists exchange sections or music one after the other; typically the performers are on different sides of a hall or venue apaisé (Fr.) Calmed appassionato Passionate appoggiatura or leaning note One or more grace notes that take up some note value of the next full note. arco