A method of compositing images that removes components in the foreground image that contain a specified colour (chroma). Typically, a subject is captured in front of a blue background, commonly referred to as a ‘blue screen’, and the blue background is removed, leaving only the subject for compositing.

 

Colour bar

A test signal which displays vertical coloured stripes on a monitor. Used to adjust the hue and saturation of colours on video cameras and monitors.

 

Default gateway

A router or computer on a network which serves as an entrance to an outside network. Other computers in the network access the outside network via the default gateway.

 

Delay

A function that delays audio to bring it into synchronisation with video and is used when video is input later than the corresponding audio.

 

DHCP (Dynamic Host Configuration Protocol)

A protocol for automatically assigning IP addresses to devices when they connect to a network, and recovering the addresses when they disconnect.

 

DNS (Domain Name System)

A system which allows internet domain names to be translated into IP addresses.

 

Embedded audio

Audio that is included in a video signal with multiple channels into one channel.

 

Encoding

Data rate conversion that uses compression technology and is performed based on the transmission bandwidth and the capacity of the recording media.

 

HDCP (High-bandwidth Digital Content Protection)

A form of copyright protection that encrypts digital signals as they travel across connections and prevents unauthorised copying of content.

 

HDMI (High-Definition Multimedia Interface)

A transmission interface standard for transferring video and audio as a digital signal.

 

Luminance keying

A method of compositing images that removes components in the foreground image based on brightness (luminance) differences. Typically, this is used to composite text by placing bright coloured text on a black background.

 

Material

Video and audio data that is input to the unit in an unchanged state.

 

Mix

A transition effect that mixes the next picture into the current picture to eventually replace the current picture.

 

Mixdown

Combining audio inputs from multiple channels into one channel.

 

Monitor

Viewing video or listening to audio. Alternatively, a device for viewing and listening.

 

Picture-in-Picture (PinP)

An effect achieved by embedding a video within another video.

 

Program (PGM)

The final video and audio signals output from this system after the application of effects. This is the video seen by viewers.

 

RGB

An output signal format which displays pictures by using the three primary colours: red, green, and blue.

 

Streaming

A method of transferring audio and data over a network for real-time playback.

 

Transition

Switching the video and audio within a specified duration.

 

Wipe

A transition effect that slides the next picture into the current picture, as if wiping the current picture away.

 

XLR

A 3-pin connector, often called a Cannon connector. A locking mechanism keeps the connector securely connected even when the cable is pulled. Very stable despite its simple structure, and often used on microphones to suppress handling noise.