broadcast quality video

broadcast quality video

(communications, multimedia)
Roughly, video with more than 30 frames per second at a resolution of 800 x 640 pixels.

The quality of moving pictures and sound is determined by the complete chain from camera to receiver. Relevant factors are the colour temperature of the lighting, the balance of the red, green and blue vision pick-up tubes to produce the correct display colour temperature (which will be different) and the gamma pre-correction to cancel the non-linear characteristic of cathode-ray tubes in television receivers. The resolution of the camera tube and video coding system will determine the maximum number of pixels in the picture.

Different colour coding systems have different defects. The NTSC system (National Television Systems Committee) can produce hue errors. The PAL system (Phase Alternation by Line) can produce saturation errors.

Television modulation systems are specified by ITU CCIR Report 624. Low-resolution systems have bandwidths of 4.2 MHz with 525 to 625 lines per frame as used in the Americas and Japan. Medium resolution of 5 to 6.5 MHz with 625 lines is used in Europe, Asia, Africa and Australasia. High-Definition Television (HDTV) will require 8 MHz or more of bandwidth.

A medium resolution (5.5 MHz in UK) picture can be represented by 572 lines of 402 pixels. Note the ratio of pixels to lines is not the same as the aspect ratio. A VGA display (480n lines of 640 pixels) could thus display 84% of the height of one picture frame.

Most compression techniques reduce quality as they assume a restricted range of detail and motion and discard details to which the human eye is not sensitive.

Broadcast quality implies something better than amateur or domestic video and therefore can't be retained on a domestic video recorder. Broadcasts use quadriplex or U-matic recorders.

The lowest frame rate used for commercial entertainment is the 24Hz of the 35mm cinema camera. When broadcast on a 50Hz television system, the pictures are screened at 25Hz reducing the running times by 4%. On a 60Hz system every five movie frames are screened as six TV frames, still at the 4% increased rate. The six frames are made by mixing adjacent frames, with some degradation of the picture.

A computer system to meet international standard reproduction would at least VGA resolution, an interlaced frame rate of 24Hz and 8 bits to represent the luminance (Y) component. For a component display system using red, green and blue (RGB) electron guns and phosphor dots each will require 7 bits. Transmission and recording is different as various coding schemes need less bits if other representations are used instead of RGB. Broadcasts use YUV and compression can reduce this to about 3.5 bits per pixel without perceptible degradation. High-quality video and sound can be carried on a 34 Mbaud channel after being compressed with ADPCM and variable length coding, potentially in real time.
This article is provided by FOLDOC - Free Online Dictionary of Computing (
References in periodicals archive ?
Broadcast quality video assets are available to the broadcast media.
Integration of Field59's video platform within BLOX CMS allows our customers to have broadcast quality video available for their desktop, mobile, and OTT applications."
Broadcast quality video encoding will allow broadcasters to stream live events to millions of viewers with the same visual quality (VQ) as video on demand (VOD).
It enables the reporting teams to carry out live broadcast quality video contributions to a variety of destinations, via satellite connectivity.
C360 Technologies focuses on linear and over-the-top (OTT) broadcast quality video solutions and has established itself as a player in the VR/AR industry.
Soulful Welsh five-piece Peasant's King are former winners of Acapela's Real Ale Real Music competition, where local emerging talent compete for the opportunity to win a session at Acapela studios to record a broadcast quality video or track.
On average one terabyte drive is capable of holding 472 hours of broadcast quality video or 150 hours of hi-definition recording.
Developed by a company called Aerosight, this type of drone is primarily used for capturing broadcast quality video with cameras like the Red Epic, Canon C300 or Sony PMW F3.
It supports loss-free video compression, enabling FORscene users to see broadcast quality video as they are editing.
Special training sessions on how to "Deliver Broadcast quality video from anywhere with only a BGAN and ClipWay" will take place on Saturday, September 12 and Monday, September 14 at the RAI center.About SeaMobile EuropeFor nearly 20 years, SeaMobile Europe has been a pioneer in providing global satellite communication services.

Full browser ?