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The minimum and maximum of these ranges represent the preferred signal limits, though the video payload may venture outside these ranges providing that the reserved code words of 0 - 3 and - are never used for video payload. In addition, the corresponding analog signal may have excursions further outside of this range.
There are three colorimetries typically used with digital video:. It is permissible to encode analog vertical interval information such as vertical interval timecode or vertical interval test signals without breaking the interface, but such usage is nonstandard and ancillary data is the preferred means for transmitting metadata. Conversion of analog sync and burst signals into digital, however, is not recommended—and neither is necessary in the digital interface. Different picture formats have different requirements for digital blanking, for example all so called line HD formats have active lines, but total lines, with the remainder being vertical blanking.
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In addition to the regular serial digital interface described here, there are several other similar interfaces which are similar to, or are contained within, a serial digital interface. This allows for multiple video streams in one cable or faster-than-realtime 2x, 4x, ASI is popular way to transport broadcast programs from the studio to the final transmission equipment before it reaches viewers sitting at home.
This standard allows, for example, several independent standard definition video signals to be multiplexed onto an HD-SDI interface, and transmitted down one wire. This standard doesn't merely adjust EAV and SAV timing to meet the requirements of the lower-bitrate formats; instead, it provides a means by which an entire SDI format including synchronization words, ancillary data, and video payload can be encapsulated and transmitted as ordinary data payload within a M stream.
It is mainly used in the consumer area, but increasingly used in professional devices including uncompressed video, often called clean HDMI.
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The CoaXPress standard is another high-speed digital interface, originally design for industrial camera interfaces. The data rates for CoaXPress go up to From Wikipedia, the free encyclopedia. This article is about the serial digital interface used in professional video. For serial interfaces in general, see serial communication.
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Main article: Ancillary data. Main article: Serial Data Transport Interface. Main article: asynchronous serial interface. Main article: HDMI. Main article: G. Main article: HDcctv.
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Poynton Morgan Kaufmann. Digital interface handbook. Retrieved European Broadcasting Un. July Retrieved 20 July Archived from the original PDF on International Telecommunication Union. Retrieved February 27, Retrieved 19 September Categories : Film and video technology Serial digital interface ITU-R recommendations Serial buses Digital display connectors Television technology Audiovisual connectors High-definition television Broadcast engineering Video signal Television terminology.
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