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DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

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SMPTE 259M, 10-Bit 4:2:2 Component<br />

and 4f SC Composite Digital<br />

Signals – Serial Digital Interface.<br />

SMPTE 344M, 540 Mb/s Serial<br />

Digital Interface.<br />

Serial digital interface (SDI)<br />

Serial digital interface (SDI) refers to a family of interfaces<br />

standardized by SMPTE. The Rec. 601 or 4f SC data<br />

stream is serialized, then subjected to a scrambling<br />

technique. SMPTE 259M standardizes several interfaces,<br />

denoted by letters A through D as follows:<br />

A Composite 4f SC NTSC video, about 143 Mb/s<br />

B Composite 4f SC PAL video, about 177 Mb/s<br />

C Rec. 601 4:2:2 component video, 270 Mb/s (This interface<br />

is standardized in Rec. 656.)<br />

D Rec. 601 4:2:2 component video sampled at 18 MHz to<br />

achieve 16:9 aspect ratio, 360 Mb/s<br />

Interfaces related to SMPTE 259M are standardized for<br />

the 483p59.94 systems specified in SMPTE 294M:<br />

• The 4:2:2p system uses two 270 Mb/s SDI links (“dual<br />

link”), for a data rate of 540 Mb/s<br />

• The 4:2:0p system uses a single link at 360 Mb/s<br />

SMPTE 344M standardizes an interface at 540 Mb/s,<br />

intended for 480i29.97, 4:4:4:4 component video; this<br />

could be adapted to convey 483p59.94, 4:2:0p video.<br />

SDI is standardized for electrical transmission through<br />

coaxial cable, and for transmission through optical fiber.<br />

The SDI electrical interface uses ECL levels, 75 Ω<br />

impedance, BNC connectors, and coaxial cable. Electrical<br />

and mechanical parameters are specified in<br />

SMPTE standards and in Rec. 656; see SDI coding on<br />

page 396. Fiber-optic interfaces for digital SDTV, specified<br />

in SMPTE 297M, are straightforward adaptations of<br />

the serial versions of Rec. 656.<br />

Component digital HDTV HD-SDI<br />

The basic coding parameters of HDTV systems are standardized<br />

in Rec. 709. Various scanning systems are<br />

detailed in several SMPTE standards referenced in<br />

Table 13.2, on page 116.<br />

130 DIGITAL VIDEO AND HDTV ALGORITHMS AND INTERFACES

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