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A440 (also known as Stuttgart pitch [1]) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A 4 in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16.
The initial standard was A = 439 Hz ⓘ, but this was superseded by A = 440 Hz, possibly because 439 Hz was difficult to reproduce in a laboratory since 439 is a prime number. [ 22 ] In 1964, of 31 top professional U.S. orchestras, 19 were tuning at 440, the others at 441 or 442. [ 23 ]
Area code 440 was established on August 16, 1997, in a three-way split of area code 216, one of the original North American area codes, [1] to provide relief from central office prefix exhaustion from increasing popularity of cellular phones and population pressure. [2]
The initial Nationwide Numbering Plan of 1947 established eighty-six numbering plan areas (NPAs) that conformed mainly to existing U.S. state and Canadian provincial boundaries, though fifteen states and provinces were subdivided further. Forty NPAs were mapped to entire states or provinces.
Scientific pitch, also known as philosophical pitch, Sauveur pitch or Verdi tuning, is an absolute concert pitch standard which is based on middle C (C 4) being set to 256 Hz rather than ~ 261.63 Hz, [a] making it ~ 31.77 cents lower than the common A440 pitch standard.
A440 or A-440 may refer to: A440 (pitch standard) A440 highway (Australia), a road in Victoria, Australia; Quebec Autoroute 440 (Laval) Quebec Autoroute 440 (Quebec City)
The pair successfully established the Stephen J. Wampler Foundation in 2004 and opened Camp Wamp, a summer camp for children with physical disabilities. The first summer the camp hosted 24 ...
Year 440 was a leap year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valentinianus and Anatolius (or, less frequently, year 1193 Ab urbe condita ).