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An equal temperament is a musical temperament or tuning system that approximates just intervals by dividing an octave into steps such that the ratio of the frequencies of any adjacent pair of notes is the same. This system yields pitch steps perceived as equal in size, due to the logarithmic changes in pitch frequency.
In music, notes are distinct and isolatable sounds that act as the most basic building blocks for nearly all of music. This discretization facilitates performance, comprehension, and analysis. Notes may be visually communicated by writing them in musical notation.
Concert pitch is the pitch reference to which a group of musical instruments are tuned for a performance. Concert pitch may vary from ensemble to ensemble, and has varied widely over time. The ISO defines international standard pitch as A440, setting 440 Hz as the frequency of the A above middle C. Frequencies of other notes are defined relative to this pitch.
Route 440 is a state highway in New Jersey, United States. It comprises two segments, a 5.15-mile (8.29 km) freeway in Middlesex County linking Interstate 287 (I-287) and the New Jersey Turnpike (I-95), in Edison to the Outerbridge Crossing in Perth Amboy and an 8.18-mile (13.16 km) four-lane divided highway in Hudson County running from the Bayonne Bridge in Bayonne to US Route 1-9 Truck in Jersey City. These two segments are connected by New York State Route 440 (NY 440), which runs across Staten Island. The freeway portion in Middlesex County is six lanes wide and intersects the Garden State Parkway and US 9 in Woodbridge.
A440 (also known as Stuttgart pitch) 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 A4 in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16. While other frequencies have been (and occasionally still are) used to tune the first A above middle C, A440 is now commonly used as a reference frequency to calibrate acoustic equipment and to tune pianos, violins, and other musical instruments.
Northeast Ohio is a geographic and cultural region that comprises the northeastern counties of the U.S. state of Ohio. Definitions of the region consist of 16 to 23 counties between the southern shore of Lake Erie and the foothills of the Appalachian Mountains, home to over 4.5 million people. It is anchored by the metropolitan area of Cleveland, the most populous city in the region with over 372,000 residents in 2020. Other metropolitan centers include Akron, Canton, Mansfield, Sandusky, and Youngstown. Northeast Ohio includes most of the area known historically as the Connecticut Western Reserve.
The Fairchild PT-19 is an American monoplane primary trainer aircraft that served with the United States Army Air Forces, RAF and RCAF during World War II. Designed by Fairchild Aircraft, it was a contemporary of the Kaydet biplane trainer, and was used by the USAAF during Primary Flying Training. As with other USAAF trainers of the period, the PT-19 had multiple designations based on the powerplant installed.
The Desert Eagle is a single-action, gas-operated, semi-automatic pistol known for chambering the .50 Action Express, the largest centerfire cartridge of any magazine-fed, self-loading pistol.
Swimming has been a sport at every modern Summer Olympics. It has been open to women since 1912. At the Olympics, swimming has the second-highest number of medal-contested events.
Scientific pitch notation (SPN), also known as American standard pitch notation (ASPN) and international pitch notation (IPN), is a method of specifying musical pitch by combining a musical note name and a number identifying the pitch's octave.
This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A4), tuned to 440 Hz (referred to as A440). Every octave is made of twelve steps called semitones. A jump from the lowest semitone to the highest semitone in one octave doubles the frequency (for example, the fifth A is 440 Hz and the sixth A is 880 Hz). The frequency of a pitch is derived by multiplying (ascending) or dividing (descending) the frequency of the previous pitch by the twelfth root of two (approximately 1.059463). For example, to get the frequency one semitone up from A4 (A♯4), multiply 440 Hz by the twelfth root of two. To go from A4 up two semitones (one whole tone) to B4, multiply 440 twice by the twelfth root of two (or once by the sixth root of two, approximately 1.122462). To go from A4 up three semitones to C5 (a minor third), multiply 440 Hz three times by the twelfth root of two (or once by the fourth root of two, approximately 1.189207). For other tuning schemes, refer to musical tuning.
The percent sign% is the symbol used to indicate a percentage, a number or ratio as a fraction of 100. Related signs include the permille sign ‰ and the permyriad sign ‱, which indicate that a number is divided by one thousand or ten thousand, respectively. Higher proportions use parts-per notation.
Noko is an English musician, multi-instrumentalist, composer and producer who has formed and/or played with a number of bands primarily as a guitarist or bassist. In chronological order they were: Alvin the Aardvark and the Fuzzy Ants, the Umbrella, the Pete Shelley Group, the Cure, Luxuria, Apollo 440, Stealth Sonic Soul, Fast, Maximum Roach, James Maker and Noko 440, Magazine, Raw Chimp, Levyathan, SCISM, Am I Dead Yet? and Buzzcocks.
A or La is the sixth note and the tenth semitone of the fixed-do solfège.
Interstate 440 (I-440), also known as the Raleigh Beltline, the Cliff Benson Beltline, or locally as The Beltline, is an Interstate Highway in the US state of North Carolina. I-440 is a 16.4-mile-long (26.4 km) partial beltway that nearly encircles central Raleigh. I-440 begins in west Raleigh at an interchange with I-40 as a continuation of U.S. Highway 64 (US 64)/US 1 and traverses a primarily residential area in west Raleigh. The freeway makes a turn toward the east, crossing US 70, Six Forks Road, and Wake Forest Road. US 1 branches north off I-440 at US 401, becoming US 401/US 1. I-440 turns toward the southeast and follows a brief concurrency with U.S. Highway 64 Business before intersecting I-87/US 64/US 264. US 64 and I-87 are concurrent with I-440 along the remainder of the road's southwesterly routing. Exit 16 is the last exit on I-440, where I-440 splits to join either I-40 eastbound or I-40 westbound.
The Convair CV-240 is an American airliner that Convair manufactured from 1947 to 1954, initially as a possible replacement for the ubiquitous Douglas DC-3. Featuring a more modern design with cabin pressurization, the 240 series made some inroads as a commercial airliner, and had a long development cycle that produced various civil and military variants. Though reduced in numbers by attrition, various forms of the "Convairliners" continue to fly in the 21st century.
Area codes 440 and 436 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Ohio, serving the parts of the Greater Cleveland area, surrounding the city of Cleveland, but not the city and most of its inner suburbs.
German submarine U-440 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 1 October 1940 by Schichau-Werke, Danzig as yard number 1491, launched on 8 November 1941 and commissioned on 24 January 1942 under Oberleutnant zur See Hans Geissler. On 20 May 1943, Geissler was replaced as commander by Oberleutnant zur See Werner Schwaff.
Interstate 87 (I-87) is a partially completed Interstate Highway in the US state of North Carolina, the shortest designated primary Interstate Highway at 12.90 miles (20.76 km) long. The completed portion is in eastern Wake County, between Raleigh and Wendell; the majority of the completed route is known as the Knightdale Bypass, while the remaining three miles (4.8 km) follows the Raleigh Beltline (I-440). It is planned to continue northeast through Rocky Mount, Williamston, and Elizabeth City, ending in Norfolk, Virginia. It is signed as north–south, in keeping with the sign convention for most odd-numbered interstates, but the route goes primarily east–west, with the eastern direction aligning to the north designation. The entire route is concurrent with US Highway 64 (US 64), with portions also concurrent with I-440 and US 264.
The Dehler 22 is a West German trailerable sailboat that was designed by E. G. van de Stadt and first built in 1983. It is van de Stadt's design number 374.
References
- ↑ "Facts about the number 440". Numbermatics - the number explorer. Retrieved 21 March 2017.
- ↑ Guy, Richard (9 March 2013). Unsolved Problems in Number Theory. Springer Science & Business Media. p. 358. ISBN 9780387266770.