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RCA connector by jojo
Uses
RCA sockets, or jacks, here used for YPbPr video output.
In the most normal usage, cables have a standard plug on each end, consisting of a central Male Connector, surrounded by a ring. The ring is often segmented for flexibility. Devices mount the jack, consisting of a central hole with a ring of metal around it. The ring is slightly smaller in diameter and longer than the ring on the plug, allowing the plug's ring to fit tightly over it. The jack has a small area between the outer and inner rings which is filled with an insulator, typically plastic (very early versions, or those made for use as RF connectors used ceramic).
As with many other connectors, the RCA has been adopted for other uses than originally intended, including as a power connector, an RF connector, and as a connector for loudspeaker cables. Its use as a connector for composite video signals is extremely common, but provides poor impedance matching. RCA connectors and cable are also commonly used to carry S/PDIF-formatted digital audio, with plugs colored orange to differentiate them from other typical connections.
Connections are made by pushing the cable's plug into the female jack on the device. The signal-carrying pin protrudes from the plug, and often comes into contact with the socket before the grounded rings meet, resulting in loud hum or buzz if the audio components are powered while making connections. Continuous noise can occur if the plug partially falls out of the jack, breaking ground connection but not the signal. Some variants of the plug, especially cheaper versions, also give very poor grip and contact between the ground sheaths due to their lack of flexibility.
They are often color-coded, yellow for composite video, red for the right channel, and white or black for the left channel of stereo audio. This trio (or pair) of jacks can be found on the back of almost all audio and video equipment. At least one set is usually found on the front panel of modern TV sets, to facilitate connection of camcorders (through 3.5mm Jack to 3 RCA, also called Mini RCA plug), digital cameras, and video gaming consoles. Although nearly all audio-visual connectors, including audio, composite and component video, and S/PDIF audio can use identical 75 cables, sales of special-purpose cables for each use have proliferated. Varying cable quality means that a cheap line-level audio cable might not successfully transfer component video or digital audio signals due to impedance mismatch and poor shielding quality (causing signal-to-noise ratio to be too low). Cables should meet the S/PDIF specification as defined by the international standard IEC 60958-3 for assured performance.
The male plug has a center pin which is 3.70 mm (1/7 inch) in diameter, and is surrounded by an outer shell which is 8.25 mm (1/3 inch) in diameter.
Disadvantages
"Bullet plug" variation. Notice the hollow center conductor and the single pin point for the return signal.
One problem with the RCA connector is that, connecting the male into the female, first the inner 'hot' (signal) connection is made before the 'cold' (screening) connection has been guaranteed. This could very well harm the equipment in question if it has not been switched off beforehand. Another problem with the RCA connectors is that each signal requires its own plug. Even the simple case of attaching a cassette deck may need four of them, two for stereo input, two for stereo output. In any common setup this quickly leads to a mess of cables and confusion how to connect them, which is made worse if one considers more complex signals like component video (a total of three for video and two for analog audio or one for digital coaxial audio).
There have been numerous attempts to introduce combined audio/video connectors for direct signals[citation needed]but in the analog realm none of these have ever become universal, except in Europe where the SCART connector is very successful. For a time the 5-pin DIN connector was popular for bi-directional stereo connection between A/V equipment, but it has been entirely displaced on modern consumer devices. Though RF modulators inherently transmit combined A/V signals in video applications, they depend on broadcast television systems and RF connectors which are not universal worldwide; RF signals are also generally inferior to direct signals due to protocol conversion and the RF limitations of the three major analog TV systems (NTSC, PAL and SECAM).
Nearly all modern TV sets, VCRs, and DVD players sold in Europe have SCART connectors, though sometimes supplemented by RCA and/or RF connectors and there are also SCART-RCA adapters. Outside Europe, separate RCA connectors are the norm[citation needed], supplemented by RF connectors for backward compatibility and simplicity; though mini-DIN connectors are sometimes used for S-Video connections, composite video, component video, and analog audio (mono or stereo) all use RCA connectors unless RF is used. In the digital realm, however, combined A/V connectors are gaining ground; HDMI is commonly being used today, and DisplayPort is a potential competitor to HDMI.
For audio signals, an RCA connection is called unbalanced, and a true balanced connection is generally preferred in certain applications because it allows for the use of long cables while reducing susceptibility to external noise.
Origin
The back of an RCA AM radio from the 1940s with RCA connector for adding a turntable. Tag around connector reads "An inexpensive RCA Victor record player will make a fine Victrola of this radio. Plug here."
The word phono in phono connector is an abbreviation of the word phonograph, because this connector was originally created to allow the connection of a phonograph turntable to a radio receiver, utilizing the radio as an amplifier. This setup was present in most radios manufactured in the 1930s onward by the Radio Corporation of America (RCA), who later marketed a special turntable for 45 RPM records (see photo).[citation needed]
Phono input
A "phono input" is a set of RCA input jacks, usually behind a stereo receiver, to which a phonograph or turntable is attached. Modern phonograph needles (styli) and phono cartridges output a very low level signal, which is input to the receiver then amplified and equalized.
Phonograph recordings are made with high frequencies boosted. This reduces background noise, including clicks or pops, and also conserves the amount of physical space needed for each groove, by reducing the size of the larger low-frequency undulations. During playback the high frequencies are rescaled to their original level. This is accomplished in the amplifier with a phono input that incorporates standardized RIAA equalization circuitry.
While in the 1980s even some larger boombox radios had phono inputs, by 2006 mostly only very sophisticated and expensive stereo receivers retained the phono input, since most users were expected to use digital music formats such as CD or satellite radio. Some newer low-cost turntables include built-in amplifiers to produce line-level outputs; devices are available that perform this conversion for use with computers; and used amplifiers and receivers are often inexpensive. All DJ mixers have phono inputs as well. One of the few midline-priced receivers currently available that has the phono input is the Sherwood RX-4109.
Color coding in consumer equipment
Plugs and sockets on consumer equipment are conventionally color-coded to aid correct connections. The standard colors for the various signals are shown below; however, beyond 7.1 audio, there are no standardized colors as of yet[citation needed].
In stereo audio applications there are combinations of either Black+Red or White+Red RCA connectors; in both cases, Red denotes Right. White or Purple may also be replaced by Black.
While these are the standard colours found on commercially made products, same-coloured cables may also be used. For example, a red cable may be used instead of a yellow one, as there is no other significant difference between them.
Composite analog video
Composite
Yellow
Analog audio
Left/Mono
White
Right
Red
Center
Green
Left surround
Blue
Right surround
Gray
Left back surround
Brown
Right back surround
Tan
Subwoofer
Purple
Digital audio
S/PDIF
Orange
Component analog video (YPbPr)
Y
Green
PB
Blue
PR
Red
Component analog video/VGA (RGB/HV)
R
Red
G
Green
B
Blue
H(Horizontal sync)/S(Composite Sync)
Yellow
V(Vertical sync)
White
References
^ http://uk.cinenow.com/articles/7249-hdmi-when-scart-scarpers
^ http://uk.cinenow.com/articles/7249-hdmi-when-scart-scarpers
^ http://www.amabilidade2002.com/scart5.htm
^ Sherwood RX-4109 http://www.sherwoodusa.com/prod_rx4109.html
^ Consumer Electronics Association standard CEA-863-A "Connection Color Codes for Home Theater Systems"
See also
Wikimedia Commons has media related to: RCA connectors
Component video
High-end audio cables
SCART
XLR connector
RF connector
v d e
Audio and video connectors
Single conductor audio
Binding post Banana plug Fahnestock clip
Analog audio
TRS XLR DIN / Mini-DIN D-sub Speakon
Digital audio
BNC S/PDIF TosLink XLR D-sub
Video
DVI / Mini-DVI / Micro-DVI DMS-59 / LFH VGA / Mini-VGA DFP BNC DIN / Mini-DIN DB13W3 D-Terminal
Audio and Video
RCA ADC Belling-Lee DisplayPort / Mini DisplayPort EVC F HDMI P&D SCART TRS
Visual charts
List of video connectors
v d e
Audio and Video Interfaces and Connectors
Audio Only
Analog
Interface: PC System Design Guide Connectors: TRS 3.5mm
Digital
Interface: S/PDIF Connectors: RCA Jack (Coaxial), TOSLINK (Optical), BNC
Video Only
Analog
Interface: VGA Connectors: DB-15 Interface: Composite Connectors: RCA jack yellow Interface: S-Video Connectors: Mini-DIN 4 Pin Interface: Component Connectors: RCA Jacks 3 Interface: Composite, S-Video, and Component Connectors: VIVO using Mini-DIN 9 Pin
Digital and
Analog
Interface: DVI Connectors: DVI
Video and Audio
Digital
Interface: HDMI Connectors: HDMI connector Interface: DisplayPort Connectors: DisplayPort connector
v d e
RF connectors (coaxial)
APC-7 BNC C F FME Hirose U.FL IPX Motorola MCX MMCX N QLS QMA/QN RCA SMA SMB SMC Twin-lead TNC TV aerial plug UHF / Mini-UHF
Variations and alternate names: 2.9 mm (SMA) 7 mm Triax / Triaxial Twin BNC / Twinax (BNC) IPEX MHF AMC (UFL) SnapN RP-TNC RP-SMA
Old or seldom used: EIA GR LEMO 00 Musa
See also: Radio frequency Radio spectrum Audio and video connectors Audio and video interfaces and connectors
Categories: Audiovisual connectors | Coaxial connectors | Signal connectorsHidden categories: All articles with unsourced statements | Articles with unsourced statements from May 2009 | Articles with unsourced statements from December 2009
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