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.
References in periodicals archive ?
CopperGate's CopperStream technology, in production today, has been integrated with Ucentric's Whole-Home Media Software Suite to enable a highly reliable IP network capable of distributing high-definition (HD) and standard definition (SD) broadcast quality video sessions.
Tzero Technologies, the only IC supplier that enables broadcast quality video over wireless networks, today announced the appointment of Dan Karr to senior vice president of sales and marketing.
Tetsuro Wada, business development and technical marketing director of the TX RISC business unit of TAEC said, "Based on our strategy for the Entertainment Home Gateway market, we chose to collaborate with ViXS because they are the clear leader in delivering broadcast quality video over any standards-based wireless network.
Artel now supports the largest installed base of broadcast quality video transport hardware in the world," said Richard Dellacanonica, President of Newfound Technology.
PK), the world's leading broadcast quality IP-based video communications service provider, today announced that Rudin Management has selected GlowPoint to introduce broadcast quality video conferencing services into Rudin Management's New York Information Technology Center located at 55 Broad Street, world renowned as the cornerstone of Silicon Alley and the location for the company's flagship "Digital Sandbox" Network Event Center.
DWJ Television today announced a new Digital Video Download system, allowing TV news producers to download broadcast quality mpeg2 digital files of VNRs and B-roll on demand, making DWJ Television the first VNR producer to offer broadcast quality video over the Internet.
264 encoding and decoding solution available in the market, not one of them really delivered on the promise of broadcast quality video at substantially lower bandwidth than MPEG-2.
As content owners and network providers select best-of-breed products that guarantee quality, reliability and scalability over IP, Path 1 is committed to providing our customers with seamless and cost effective solutions for the real-time transport of live broadcast quality video over those networks.
This same efficiency applies equally well to a broad range of corporate services, military, government and educational applications -- basically, anywhere broadcast quality video needs to be moved and efficient bandwidth usage is desired.
AMEX: PNO), an industry leader in providing products that enable broadcast quality video to be transmitted over packet-based IP networks and Axiowave Networks, the leading provider of core/metro network routers that offer the industry's first ATM-Grade IP SLAs, announced today they have formed a strategic partnership that will enable service providers to offer ATM-Grade, point-to-point and extremely low worst case latency and jitter guarantees to their customers under all network traffic conditions for the first time.
The bandwidth limitations inherent with existing DSL platforms create a challenge for operators in providing a broadcast quality video service to their customers.
AMEX:PNO), a leading provider of video routing products that enable broadcast quality video to be sent over IP networks, announced today that Dr.

Full browser ?