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Historical
ANSI S1.22-1992 (R2002)
Scales and Sizes for Frequency Characteristics and Polar Diagrams in Acoustics
Covers rectangular cartesian graphs in which a level (in decibels) of an acoustical quantity is plotted against frequency on a logarithmic scale, the scale proportions shall be those for which the length for a 10:1 frequency ratio on the abscissa is equal to the length for a level difference of 25, 50, or 10 decibels (db) on the ordinate. For polar diagrams in which an absolute or relative level (in decibels) is shown increasing outward along a radius on a linear scale, a reference circle shall be identified whose radius is a difference in level of 50 db (alternatively, 25 db), and such that maximun level is preferably plotted within 5 db (alternatively, 2.5 db) of the reference circle. For polar diagrams of relative level, the level assigned to the reference circle is preferably 0 db; the angle assigned to the reference direction is preferably zero degrees. The preferred size for one decibel is 2, 1 or 5 mm.
Content Provider
Acoustical Society of America [asa]
