Greensboro, North Carolina

Greensboro (ⁱ/ˈɡriːnzbʌroʊ/) (formerly Greensborough) is a city in the U.S. state of North Carolina. It is the third-largest city by population in North Carolina and the largest city in Guilford County and the surrounding Piedmont Triad metropolitan region. According to the 2012 U.S. Census Estimate, Greensboro's population is 277,080. It is located at the intersection of three major interstate highways (Interstate 85, Interstate 40 and Interstate 73) in the Piedmont region of central North Carolina.

In 2003, the previous Greensboro – Winston-Salem – High Point metropolitan statistical area (MSA) was re-defined by the U.S. Office of Management and Budget, resulting in the formation of the Greensboro-High Point MSA and the Winston-Salem MSA. The 2010 population for the Greensboro-High Point MSA was 723,801. The Greensboro – Winston-Salem – High Point combined statistical area (CSA), popularly referred to as the Piedmont Triad, had a population of 1,599,477.

In 1808, Greensborough (the spelling before 1895) was planned around a central courthouse square to succeed the nearby town of Guilford Court House as the county seat. This act moved the county courts closer to the geographical center of the county, a location more easily reached by the majority of the county's citizens.

Radio

Radio is the use of radio waves is to carry information, such as sound, by systematically modulating some property of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and vice versa. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc. Radio frequencies occupy the range from a 3 kHz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum.

North Carolina

North Carolina (ⁱ/ˌnɔːrθ kærəˈlaɪnə/) is a state in the southeastern region of the United States. The state borders South Carolina and Georgia to the south, Tennessee to the west, Virginia to the north, and the Atlantic Ocean to the east. North Carolina is the 28th most extensive and the 9th most populous of the 50 United States. North Carolina is known as the Tar Heel State and the Old North State.

North Carolina is composed of 100 counties. Its two largest metropolitan areas are among the top ten fastest-growing in the country: its capital, Raleigh, and its largest city, Charlotte. In the past five decades, North Carolina's economy has undergone a transition from reliance upon tobacco, textiles, and furniture-making to a more diversified economy with engineering, energy, biotechnology, and finance sectors.

North Carolina has a wide range of elevations, from sea level on the coast to 6,684 feet (2,037 m) at Mount Mitchell, the highest point in North America east of the Mississippi River. The climate of the coastal plains is strongly influenced by the Atlantic Ocean. Most of the state falls in the humid subtropical climate zone. More than 300 miles (500 km) from the coast, the western, mountainous part of the state has a subtropical highland climate.

Vehicle audio

Vehicle audio is equipment installed in a car or other vehicle to provide in-car entertainment and information for the vehicle occupants. Until the 1960s it consisted of a simple AM radio. Additions since then have included FM radio, CD players, navigation systems, Bluetooth telephone integration, and smartphone controllers like CarPlay and Android Auto. Once controlled from the dashboard with a few buttons, they can now be controlled by steering wheel controls and voice commands.

Initially implemented for listening to music and radio, vehicle audio is now part of car telematics, telecommunication, in-vehicle security, handsfree calling, navigation, and remote diagnostics systems. It is also used to create fake engine noise. For the 2015 Ford Mustang EcoBoost, an "Active Noise Control" system was developed that amplifies the engine sound through the car speakers. A similar system is used in the F-150 pickup truck. Volkswagen uses a Soundaktor, a special speaker to play sounds in cars such as the Golf GTi and Beetle Turbo. BMW plays a recorded sample of its motors through the car speakers, using a different samples according to the engine’s load and power.

21 (disambiguation)

Twenty-one or 21 may refer to:

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