S

(as in "S-Video") a two-component video interface

SAD

Sum of Absolute Distortions

SAP

Secondary Audio Program

SAR

Successive Approximation Register

SAV

Start of Active Video

SC

Subcarrier

SCART

Consumer A/V connector (common in Europe)

SCH

Subcarrier to Horizontal sync timing

SCR

System Clock Reference

SCSI

Small Computer Systems Interface

SDDI

Serial Digital Data Interface

SDI

Serial Digital Interface

SDTI

Serial Digital Transport Interface

SDTV

Standard Definition Television

SEC

Sequence End Code

SECAM

Sequence de Couleur A Memoire

SFX

Special Effects

SID

Source ID

SIF

Standard Interface Format

SIS

Sound in Sync

SMATV

Satellite Master Antenna Television

SMPTE

Society of Motion Picture and Television Engineers