Broadcast television systems

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Terrestrial television systems (or Broadcast television systems in the US and Canada) are the encoding or formatting standards for the transmission and reception of terrestrial television signals.wikipedia
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NTSC

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There were three main analog television systems in use around the world until the late 2010s (expected): NTSC, PAL, and SECAM.
The articles on broadcast television systems, and analogue television further describe frame rates, image resolution and audio modulation.

Analog television

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There were three main analog television systems in use around the world until the late 2010s (expected): NTSC, PAL, and SECAM.
All broadcast television systems used analog signals before the arrival of digital television (DTV).

SECAM

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There were three main analog television systems in use around the world until the late 2010s (expected): NTSC, PAL, and SECAM.
The articles on broadcast television systems, and analogue television further describe frame rates, image resolution and audio modulation.

Interlaced video

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All analog television systems are interlaced: alternate rows of the frame are transmitted in sequence, followed by the remaining rows in their sequence.
To prevent flicker, all analog broadcast television systems used interlacing.

ISDB

ISDB-TIntegrated Services Digital BroadcastingISDB-S
Now in digital terrestrial television (DTT), there are four main systems in use around the world: ATSC, DVB, ISDB and DTMB.
Brazil, which currently uses an analogue TV system (PAL-M) that slightly differs from any other countries, has chosen ISDB-T as a base for its DTV format, calling it ISDB-Tb or internally SBTVD (Sistema Brasileiro de Televisão Digital-Terrestre).

Television channel frequencies

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* Also see: television channel frequencies
See Broadcast television systems for a table of signal characteristics, including bandwidth, by ITU letter designator.

PAL

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There were three main analog television systems in use around the world until the late 2010s (expected): NTSC, PAL, and SECAM.
The articles on broadcast television systems and analogue television further describe frame rates, image resolution and audio modulation.

CCIR System M

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CCIR (or FCC) System M, sometimes called 525 line, is the analog broadcast television system used in the United States since July 1, 1941, and also in most of the Americas and Caribbean, South Korea, and Taiwan.

Terrestrial television

Broadcastover-the-airterrestrial
Terrestrial television systems (or Broadcast television systems in the US and Canada) are the encoding or formatting standards for the transmission and reception of terrestrial television signals.

Color television

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Each country, faced with local political, technical, and economic issues, adopted a color television system which was grafted onto an existing monochrome system, using gaps in the video spectrum (explained below) to allow color transmission information to fit in the existing channels allotted.
There are three main analog broadcast television systems in use around the world, PAL (Phase Alternating Line), NTSC (National Television System Committee), and SECAM (Séquentiel Couleur à Mémoire—Sequential Color with Memory).

Digital television

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DVB-C stands for Digital Video Broadcasting - Cable and it is the DVB European consortium standard for the broadcast transmission of digital television over cable.
Digital television supports many different picture formats defined by the broadcast television systems which are a combination of size and aspect ratio (width to height ratio).

Analog high-definition television system

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The French 819 line system E was a post-war effort to advance France's standing in television technology.
Analog high-definition television was an analog video broadcast television system developed in the 1930s to replace early experimental systems with as few as 12-lines.

441-line television system

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441 lines, or 383i if named using modern standard, is an early electronic monochrome television system.

576i

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Typically, for 25 frame/s formats (European among other countries with 50 Hz mains supply), the content is PAL speedup, while a technique known as "3:2 pulldown" is used for 30 frame/s formats (North America among other countries with 60 Hz mains supply) to match the film frame rate to the video frame rate without speeding up the play back.
When 576i video is transmitted via baseband (i.e., via consumer device cables, not via RF), most of the differences between the "one-letter" systems are no longer significant, other than vertical resolution and frame rate.

405-line television system

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Note that the British 405-line system A, unlike all the other systems, suppressed the upper sideband rather than the lower—befitting its status as the oldest operating television system to survive into the color era (although was never officially broadcast with color encoding).
405-line is System A in the CCIR assignment of broadcast systems.

Digital terrestrial television

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Now in digital terrestrial television (DTT), there are four main systems in use around the world: ATSC, DVB, ISDB and DTMB.

ATSC standards

ATSCdigitalATSC standard
Now in digital terrestrial television (DTT), there are four main systems in use around the world: ATSC, DVB, ISDB and DTMB.

Digital Video Broadcasting

DVBDigital Video BroadcastDVB Project
Now in digital terrestrial television (DTT), there are four main systems in use around the world: ATSC, DVB, ISDB and DTMB.