Broadcast-safe or broadcast legal or legal signal is a term used in the
broadcastindustry to define videoand audiocompliant with the technicalor regulatory broadcast requirements of the target area or region the feed might be broadcasting to [ [http://livedocs.adobe.com/en_US/AfterEffects/8.0/help.html?content=WSE0A9B424-9673-4fd0-BED7-2ED4E1EB1E8D.html After Effects CS3 - Broadcast-safe colors] ] . In the United States, the Federal Communications Commission(FCC) is the regulatory authority; in most of Europe, standards are set by the European Broadcasting Union(EBU).
Broadcast safe video
Broadcast safe Standard Definition video
Broadcast safe 625 video
Broadcast safe standards for 625 lines of
Standard Definition(Inaccurately referred to as PAL, a colour encoding that is usually used with such systems) videoare [ [http://www.matrox.com/video/support/ds/specs/ds_video/composite_video_measurements.cfm Matrox - Composite video measurements] ] [ [http://www.videouniversity.com/palbars.htm VideoUniversity.com - PAL Colour Bars] ] :
* Commonly used No. of Vertical Lines = 625 (576 visible active video)
* Commonly used Frame rate = 25 Hz (25 frame/s)
* Commonly used TV Resolution = 720 x 576 (
* Black levels = 0 mV or 0 IRE
* White levels (
** 700 mV p-p or 100 IRE - 100% intensity setting which corresponds to 126.96.36.199
** 75% intensity corresponding to 188.8.131.52 color bars, also referred to as EBU Bars .
Broadcast safe 525 video
Broadcast safe standards for 525 lines of
Standard Definition( NTSC) video are [ [http://www.videouniversity.com/engineer.htm VideoUniversity.com - Engineering Primer] ] [ [http://www.tek.com/Measurement/App_Notes/NTSC_Video_Msmt/colorbars.html?view=print&page=http://www.tek.com/Measurement/App_Notes/NTSC_Video_Msmt/colorbars.html Tektronix - The Color Bars Signal -- Why and How] ] [ [http://www.glennchan.info/articles/technical/setup/75IREsetup.html The 7.5 IRE Setup Problem] ] [ [http://www.geniusdv.com/weblog/archives/adobe_photoshop_and_ntsc_color_safe.php GeniusDV - Adobe Photoshop and NTSC Color Safe] ] [ [http://www.videouniversity.com/bcstreq.htm VideoUniversity.com - Broadcast Requirements for Commercials and Informercials] ] :
* Commonly used Frame rate = 30 frame/s black and white, 29.97 frame/s color
* Black level = 7.5 IRE for
NTSCin the US, 0 IRE in Japan.
* Blanking level = 0 IRE
* White levels = 100 IRE, 714 mV
* Maximum signal level = 120 IRE
* Minimum signal level = -20 IRE
Video gear aimed at consumers sometimes produces video signals which are not broadcast safe. Usually this is to reduce the cost of the gear, and because a non-standard video signal in the home might not create the problems that one might find in a broadcast facility. Some potential flaws:
* VHS and 8 mm: These formats are prone to
time base error, and in their non high-bandversions transmit noticeably less detail and more noise than is normal for standard definition TV.
* Older videogame systems: Before the sixth generation of videogame consoles, most videogames generated a video signal lacking the half scan line needed to make
interlacehappen. This subtle simplification caused NTSC sets to scan 240p instead of 480i, with similar results for PAL. While this actually improved picture quality for the kind of images that videogames of this era generated, such a signal would cause problems in a broadcast environment.
* VGA to NTSC converters: VGA runs at true 60 frame/s, not the slightly slower rate of NTSC. Some low cost VGA to NTSC converters could not correct for this, and would generate an NTSC signal with accelerated timing. Most TVs had no problem displaying this, but such a signal would rapidly deteriorate if recorded onto analog VCRs that are unable to compensate for the increased framerate.
Broadcast safe High Definition video
Digital broadcasting is very different from analog. The NTSC and PAL standards describe both transmission of the signal and how the electrical signal is converted into an image. In digital, there is a separation between the subject of how data is to be transmitted from tower to TV, and the subject of what content that data might contain. While data transmission is likely to be a fixed and consistent affair, the content could vary from High Definition video one hour, to SD multicasting the next, and even to non-video datacasting. In the US,
8VSBtransmits the data, while MPEG-2encodes pictures and sound.
Broadcast safe audio
Broadcast engineers in
North Americausually line up their audio gear to 0 db (-4.0 ~ 0.1 db) using a VU meter, in Europeequating to roughly +4 dB ~ +6 dB on a PPM [ [http://www.shure.com/ProAudio/Products/us_pro_ea_vu Shure - VU and PPM Audio Meters: An Elementary Explanation] ] .
Broadcast audio as a rule must be as free as possible of
Gaussian noise, that is to say, it must be as close to the noise floor, as is reasonably possible, considering the storage or transmission medium.
Broadcast audio must have a good
signal-to-noise ratio, where speech or music is a bare minimum of 16db above the noise of the recording or transmission system. For audio that has a much poorer signal-to-noise ratio (like cockpit voice recorders), sonic enhancement is recommended.
Peak programme meter
SMPTE color bars
* [http://www.ee.surrey.ac.uk/Contrib/WorldTV/broadcast.html More information about TV standards]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Broadcast engineering — Infobox Occupation name= PAGENAME caption= official names= Broadcast engineer * Broadcast Systems Engineer. * Broadcast IT Engineer. * Broadcast Network Engineer. * Broadcast Maintenance Engineer. * Studio Broadcast Engineer. * Outside Broadcast… … Wikipedia
Broadcast television systems — There are several broadcast television systems in use in the world today. An analogue television system includes several components: a set of technical parameters for the broadcast signal, a system for encoding color, and possibly a system for… … Wikipedia
Broadcast programming — Not to be confused with television program. TV guide redirects here. For the American television magazine, see TV Guide. Broadcast programming or scheduling is the practice of organizing television shows or radio programs in a daily, weekly, or… … Wikipedia
Safe area — is a term used in television production to describe the areas of the television picture that can be seen on television screens.Older televisions can display less of the space outside of the safe area than ones made more recently. Flat panel… … Wikipedia
Safe At Home (TV series) — Safe At Home was an American comedy show airing in the mid to late 1980s on the then Superstation WTBS. Initially, the show focused on Caroline Ford, a young woman who moves away from her mom and dad to join her older brother in Chicago. Martha… … Wikipedia
Safe & Sound (Prison Break episode) — Infobox Television episode Title = Safe Sound Series = Prison Break Caption = Season = 4 Episode = 5 Airdate = September 22, 2008 Writer = Seth Hoffman Director = Karen Gaviola Season list = Infobox Prison Break season 4 episode list Episode list … Wikipedia
Digital Terrestrial Multimedia Broadcast — List of digital television broadcast standards DVB standards (Europe) DVB S (satellite) DVB S2 DVB T (terrestrial) DVB T2 DVB C ( … Wikipedia
Automatic dependent surveillance-broadcast — (ADS B) is a cooperative surveillance technique for air traffic control and related applications. An ADS B out equipped aircraft determines its own position using a global navigation satellite system and periodically broadcasts this position and… … Wikipedia
Fail Safe (2000 TV) — Infobox Film name = Fail Safe imdb id = 0235376 producer = George Clooney Pamela Oas Williams Laura Ziskin Walter Bernstein Harvey Wheeler Tom Park Eric J. Wilker Amy Minda Cohen director = Stephen Frears writer = Eugene Burdick Harvey Wheeler… … Wikipedia
Fail-Safe (1964 film) — articleissues plot = July 2008 trivia = July 2008 unreferenced = July 2008Infobox Film name = Fail Safe caption = original movie poster amg id = 1:16577 imdb id = 0058083 producer = Sidney Lumet Charles H. Maguire Max E. Youngstein director =… … Wikipedia