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   » » Wiki: Vehicle Audio
Tag Wiki 'Vehicle Audio'.
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Vehicle audio is equipment installed in a car or other vehicle to provide in-car entertainment and information for the vehicle occupants. Until the 1950s it consisted of a simple AM radio. Additions since then have included (1952), 8-Track tape players, cassette players, CD players (1984), DVD players, Blu-ray players, navigation systems, Bluetooth telephone integration, and smartphone controllers like and . 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 , telecommunication, in-vehicle security, calling, navigation, and remote diagnostics systems. The same loudspeakers may also be used to minimize road and engine noise with active noise control, or they may be used to augment engine sounds, for instance making a smaller engine sound bigger.


History
In 1904, well before commercially viable technology for mobile radio was in place, American inventor and self-described "Father of Radio" Lee de Forest did some demonstration around a car radio at the 1904 Louisiana Purchase Exposition in St. Louis. Radiomuseum.org Accessed February 16, 2018

Around 1920, technology had matured to the point where the availability of made radio broadcasting viable. A technical challenge was that the vacuum tubes in the radio receivers required 50 to 250 but car batteries ran at 6V. Voltage was stepped up with a vibrator that provided a pulsating DC which could be converted to a higher voltage with a , , and filtered to create higher-voltage DC.

In 1924, Kelly's Motors in NSW, Australia, installed its first car radio.

In 1930, the American Galvin Manufacturing Corporation marketed a branded for $130. It was expensive: the contemporary Ford Model A cost $540. A Plymouth sedan, "wired for Philco Transistone radio without extra cost," is advertised in Ladies' Home Journal in 1931. In 1932 in Germany the AS 5 and radio was marketed for 465 Reichsmark, about one third of the price of a small car. Because it took nearly 10 litres of space, it could not be located near the driver, and was operated via a steering wheel remote control. In 1933 offer a factory fitted car radio.

(1977). 9780900424540, Guinness Superlatives.
By the late 1930s, push button AM radios were considered a standard feature. In 1946 there were an estimated 9 million AM car radios in use.

An FM receiver was offered by Blaupunkt in 1952. In 1953, Becker introduced the AM/FM Becker Mexico with a Variometer tuner, basically a station-search or scan function.

In April 1955, the Chrysler Corporation had announced that it was offering a model 914HR branded all transistor car radio, as a $150 option for its 1956 Chrysler and Imperial car models. Chrysler Corporation had decided to discontinue its all transistor car radio option at the end of 1956, due to it being too expensive, and replaced it with a cheaper hybrid (transistors and low voltage vacuum tubes) car radio for its new 1957 car models. In 1963 Becker introduced the Monte Carlo, a tubeless solid state radio, with no vacuum tubes.

In 1964 launched the and in 1968 a dashboard car radio with a built in cassette player was also introduced by Philips. In 1965 Ford and Motorola jointly introduced the 8-track tape in-car tape player as optional equipment for the new 1966 Ford car models. In subsequent years cassettes supplanted the 8-track, and improved with longer play times, better tape quality, auto-reverse, and Dolby noise reduction. They were popular throughout the 1970s and '80s. While the CD had been on the market since 1982, it was in 1984 that Pioneer introduced the CDX-1, the world's first car CD player. It was known for its improved sound quality, instant track skipping and the formats increased durability over cassette tapes. Due to the ability that allowed drivers and passengers to change up to 10 CD's at a time, car CD changers started to gain popularity in the late 80s and continuing throughout the 90s. Stock and aftermarket players began appearing in the late 1980s, competing with the cassette. The first car with an OEM CD player was the 1987 Lincoln Town Car, and the last new cars in the American market to be factory-equipped with a cassette deck in the dashboard was the 2010 Lexus SC430, and the Ford Crown Victoria.

From 1974 to 2005 the Autofahrer-Rundfunk-Informationssystem was used by the German ARD network. Developed jointly by the Institut für Rundfunktechnik and Blaupunkt, it indicated the presence of traffic announcements through manipulation of the 57 of the station's FM signal. ARI was replaced by the Radio Data System.

In the 2010s new ways to play music came into competition with the CD and FM radio such as , satellite radio, USB and , and in-dash slots for . And the automobile head unit became increasingly important as a housing for front and , navis, and operating systems with multiple functions, such as , and . Latest models are coming equipped with features like Bluetooth technology along with HDMI port for better connectivity. Screen size varies from 5-inch to 7-inch for the double Din car stereos.


Active noise control and noise synthesis
The automobile sound system may be part of an active noise control system which reduces engine and road noise for the driver and passengers. One or more microphones are used to pick up sound from various places on the vehicle, especially the engine compartment, underside or exhaust pipes, and these signals are handled by a digital signal processor (DSP) then sent to the loudspeakers in such a way that the processed signal reduces or cancels out the outside noise heard inside the car. An early system focused only on engine noise was developed by and licensed for the 1992 /ref> One benefit of active noise control is that the car can weigh less, with less sound-deadening material used, and without a heavy /ref> Other operating data may also play a part in the DSP, data such as the engine's speed in revolutions per minute (RPM) or the car's highway speed. A multiple source reduction system may reach as much as 80% of noise removed.http://what-when-how.com/automobile/adaptive-noise-control-automobile/

The same system may also be used to synthesize or augment engine noise to make the engine sound more powerful to the driver. For the 2015 EcoBoost Fastback and EcoBoost Fastback Premium, an "Active Noise Control" system was developed that amplifies the engine sound through the car speakers. A similar system is used in the . uses a , a special speaker to play sounds in cars such as the GTi and Beetle Turbo. plays a recorded sample of its motors through the car speakers, using a different samples according to the engine’s load and power.


Components and terms
Stock system is the application that the vehicle's manufacturer specified to be installed when the car was built.

Aftermarket components can also be used.

  • : Headunit products includes the screen and buttons and are manufactured mainly in DIN form factor, which refers to ISO 7736. Head units come as single DIN or double DIN.
  • Connectors for car audio, where ISO 10487 Harness Adapter is used.
  • Mobile audio power amplifiers

Amplifiers increase the power level of audio signals. Some head units have built-in stereo amplifiers. Other car audio systems use a separate stand-alone amplifier. Every amplifier has a rated power level sometimes noted on the head unit with the built in amplifier, or on the label of a stand-alone unit.

  • Car and .
  • Damping: sound deadening material is often used in the door cavities and boot/trunk area to damp excess vibration of the panels in the car in response to loud subwoofer bass tones, especially the boot/trunk.


Legality
Extremely loud sound systems in automobiles may violate the noise ordinance of some municipalities, some of which have outlawed them. In 2002 the U.S. Department of Justice issued a guide to police officers on how to deal with problems associated with loud audio systems in cars.

==Gallery==

[File:Autoradio]]


See also
  • List of car audio manufacturers and brands

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