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Terms and Glossary

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s


S Connector

Video connector used for video signals with separate luminance and chrominance (YC) - normally 4 pin as in HI-8 or S-VHS.

S-Video

Super-video or Component video. A format in which a video signal is split into a Luminance (brightness) component and a Chrominance (color) component

S/N

Signal to noise ratio (normally the greater the better).

SAV

Abbreviation for "Start of Active Video". A digital synchronization sequence consisting of a sequence of four consecutive code words (a code word of all ones, a code word of all zeros, another code word of all zeros, and a code word including F (field/frame), V (vertical), H (horizontal), P3, P2, P1, and P0 (parity) bits.) which is used to designate the end of the horizontal blanking interval. The pixel immediately following the SAV is known as pixel 0 and designates the first pixel of the specific line of the digital image. See also EAV

Scanning

The way the picture refreshes. The main two types are Progressive or Interlaced.

Progressive: A scanning mode where the whole image refreshes at the same time. At low frame rates such as 25 fps this gives a filmic quality to the recorded pictures.

Interlaced: A scanning mode in which the odd lines of pixels are scanned first followed by the even lines of pixels a fraction of a second later. This creates two fields of pixels giving a perceived doubling of the picture refresh rate, but where each field has half the resolution of the whole frame. For example, at 25 frames per second, the picture is divided into 50 interlaced fields per second giving a more realistic "video" look than progressive scanning.

PsF: Some recording formats use a hybrid of the two scanning types called Progressive Segmented Frame or PsF. Here progressively captured pictures are reprocessed in-camera to be interlaced. A PsF picture has the same filmic quality as a progressive picture although it is actually interlaced.

Scart Connector

Or peritel 21 pin euro standard connector used to carry various signal information including audio and video.

Schema

A definition of a structure of optional or required fields and allowed values for data entry. OFten used in relation to metadata within files or within a database.

SDI

Serial Digital Interface. A bit-serial digital interface for SDTV component signals operating at data rates ranging from 19.4Mb/s up to 540Mb/s. The SDI interface is standardized in SMPTE 259M, SMPTE 310M and can be carried over coaxial and fiber optic cables

Secam

Sequential colour with memory, system used in France.

Sequential Switcher

Typically a device used in surveillance to provide dis-continuous monitoring of two or more outputs on a single display screen.

Serial data transport interface (SDTI)

Transmission standard defined by the Society of Motion Picture and Television Engineers (SMPTE) to transmit compressed digital video using serial digital video interface (SDI) connections.

Serial Digital (SDI)

Serial Digital Interface a standardised interface for transmitting digital television signals using a coaxial cable in serial form. Often used informally to refer to the 4:2:2 sampled standard definition serial digital television signals as specified in SMPTE 259M

Serial digital video interface (SDI)

Transmission standard defined by SMPTE which is used to connect video production equipment to transfer SD video at 270, 360, or 540 Mbps and HD video at 1.485 Gbps.

Server

A computer terminal dedicated to serving stored data to other computers connected to a network. Multiple servers may be connected in areas such as electronic newsrooms and the Internet.

Servo

Electronic regulator for a motor providing precise control.

sF

Acronym for segmented frame which is a method of transporting progressive HDTV images over an HDSDI interface. The picture is progressively scanned, however it is divided into two segments, containing the odd and even lines. The segments are then sent out the serial digital interface in the same way that the fields of an interlaced video signal are. This format is often used at nominal frame rates of 24, 25 or 30 frames per second

Skew

Vertical break up of picture on poor VTR recordings.

Skew Regulator

This adjusts tape tension when a tape is changed to avoid skewing distortion at the top of the screen resulting from the video track length altering after the changeover.

Slave

A secondary machine (usually VTR) controlled by a primary 'Master' machine.

SMPTE

Society of Motion Picture and Television Engineers. SMPTE is a professional organisation that recommends standards for the film and television industries. Evertz is a sustaining member of this engineering organization

SMPTE 125M

The SMPTE standard for bit parallel digital interface for component video signals. SMPTE 125M defines the parameters required to generate and distribute component video signals on a parallel interface for 525 line video systems

SMPTE 12M-1

The SMPTE standard for the Time and Address Control signal in widespread use in the professional video and audio industries. SMPTE 12M-1 defines the specifications for both Linear Time Code (LTC) and Vertical Interval Time Code (VITC).

SMPTE 12M-2

The SMPTE Recommended Practice for transmitting Time code in the ancillary data space of serial digital television signals

SMPTE 170M

The SMPTE standard for the NTSC Composite Analog Television signals

SMPTE 259M

The SMPTE standard for the serial digital interface for standard definition 10 bit 4:2:2 component and 4Fsc composite interfaces. (Often referred to as SDI)

SMPTE 272M

The SMPTE standard for embedding AES audio into standard definition serial digital interfaces

SMPTE 274M

The SMPTE standard for HDTV 1920 x 1080 line scanning and analog and parallel interfaces for multiple frame rates

SMPTE 276M

The SMPTE standard for transmission of AES digital audio over coaxial cable

SMPTE 291M

The SMPTE standard for Ancillary Data Packet and Space Formatting

SMPTE 292M

The SMPTE standard for the 1.485 Gb/s serial digital interface for High Definition television signals. (Often referred to as HD SDI)

SMPTE 293M

Television - 720 x 483 Active Line at 59.94-Hz Progressive Scan Production - Digital Representation

SMPTE 296M

The SMPTE standard for HDTV 1280 x 720 line progressive images - scanning and analog and parallel interfaces

SMPTE 299M

The SMPTE standard for embedding AES audio into high definition serial digital interfaces

SMPTE 305M

Television - Serial Data Transport Interface (SDTI)

SMPTE 309M

The SMPTE standard for the encoding Date and Time Zone information into SMPTE 12M-1 Time code signals

SMPTE 310M

Television - Synchronous Serial Interface for MPEG-2 Digital Transport Streams

SMPTE 349M

Television - Transport of Alternate Source Image Formats through SMPTE 292M

SMPTE 372M

The SMPTE standard for the dual link 1.485 Gb/s serial digital interface for High Definition television signals

SMPTE 424M

The SMPTE standard for the nominal 3Gb/s serial digital interface for High Definition television signals

SNMP

Simple Network Management Protocol. SNMP is a standard computer network protocol that enables different devices sharing the same network to communicate with each other

Society of Motion Picture and Television Engineers (SMPTE)

Forum that defines standards for television

SPG

Synchronising Pulse Generator used to produce master timings for studios.

SRW

Model number prefix for Sony HDCAM SR HD mastering equipment

Standard definition television (SDTV)

Standard definition video format that has 4:3 aspect ratio.

Standards Converter

Used to convert TV pictures from one standard to another, typically NTSC to PAL. The highest specification is that with motion compensation especially ALCHEMIST with Phc. (Phase Correlation)

Still Frame

Continuous reproduction of a stationary helical scan video tape.

SxS

This is a solid state card format, for example used by the Arri Alexa and the Sony XDCAM EX range of cameras.

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