Monday, November 10, 2014

S-Video Physical Connectors

The four-pin mini-DIN connector is the most common of several S-Video connector types. Other connector variants include seven-pin locking "dub" connectors used on many professional S-VHS machines, and dual "Y" and "C" BNC connectors, often used for S-Video patch panels. Early Y/C video monitors often used phono (RCA connector) that were switchable between Y/C and composite video input. Though the connectors are different, the Y/C signals for all types are compatible.

JVC introduced the DIN-connector as both an S-VHS connector and as Super Video.

The mini-DIN pins, being weak, sometimes bend. This can result in the loss of colour or other corruption (or loss) in the signal. A bent pin can be forced back into shape, but this carries the risk of the pin breaking off.

Non-4-pin variants
These plugs are usually made to be plug-compatible with S-video, and include optional features, such as component video using an adapter. They are not necessarily S-video, although they can be operated in that mode.

7-pin mini-DIN

Non-standard 7-pin mini-DIN connectors (known as "7P") are used in some computer equipment (PCs and Macs). A 7-pin socket accepts and is pin compatible with a standard 4-pin S-Video plug. The three extra sockets may be used to supply composite (CVBS), an RGB or YPbPr video signal, or an I²C interface. The pin out usage varies between manufacturers. In some implementations, the remaining pin needs to be grounded to enable the composite output or disable the S-Video output.

Some Dell laptops have a digital audio output in a 7-pin socket.

9-pin Video In/Video Out

9-pin connectors are used in graphics systems that feature the ability to input video as well as output it. Again, there is no standardization between manufacturers as to which pin does what, and there are two known variants of the connector in use. As can be seen from the diagram above, although the S-Video signals are available on the corresponding pins, neither variant of the connector will accept an unmodified 4-pin S-Video plug, though they can be made to fit by removing the key from the plug. In the latter case, it becomes all too easy to misalign the plug when inserting it with consequent damage to the small pins.