SECAM

SÉCAMCIS-SECAMSECAM L
SECAM, also written SÉCAM (, Séquentiel couleur à mémoire, French for "Sequential colour with memory"), is an analog color television system first used in France.wikipedia
347 Related Articles

NTSC

analogNTSC-M30p
It was one of three major color television standards, the others being PAL and NTSC.
It was one of three major analog color television standards, the others being PAL and SECAM.

PAL

colour television25pPAL-N
It was one of three major color television standards, the others being PAL and NTSC.
It was one of three major analogue colour television standards, the others being NTSC and SECAM.

Broadcast television systems

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

Analog television

analoganalogueanalogue television
SECAM, also written SÉCAM (, Séquentiel couleur à mémoire, French for "Sequential colour with memory"), is an analog color television system first used in France.
The colors in those systems are encoded with one of three color coding schemes: NTSC, PAL, or SECAM, and then use RF modulation to modulate this signal onto a very high frequency (VHF) or ultra high frequency (UHF) carrier.

Digital television transition

digital switchoveranalog shutdowntransition
All the countries using SECAM are currently in the process of conversion, or have already converted to DVB, the new pan-European standard for digital television.

France 2

Antenne 2France 2 CinémaFrance2
SECAM was inaugurated in France on 1 October 1967, on la deuxième chaîne (the second channel), now called France 2.
The switch to colour occurred at 14:15 CET on 1 October 1967, using the SECAM system.

Gamma correction

gammagamma curvegamma compression
Two standards were developed: Non-linear NIIR, in which a process analogous to gamma correction is used, and Linear NIIR or SECAM IV that omits this process.
For television signals, the actual gamma values are defined by the video standards (NTSC, PAL or SECAM), and are always fixed and well-known values.

Henri de France

Development of SECAM began in 1956 by a team led by Henri de France working at Compagnie Française de Télévision (later bought by Thomson, now Technicolor).
His inventions include the 819 line French standard and the SECAM color system.

High-definition television

HDTVhigh definitionHD
Thomson also co-authored the ATSC standards which are used for American high-definition television.
European standards did not follow until the 1960s, when the PAL and SECAM color systems were added to the monochrome 625 line broadcasts.

YDbDr

YD B D R
The color difference signals in SECAM are actually calculated in the YDbDr color space, which is a scaled version of the YUV color space.
YDbDr, sometimes written YD B D R, is the colour space used in the SECAM analog terrestrial colour television broadcasting standard, which is used in France and some countries of the former Eastern Bloc.

Composite video

compositeCVBScomposite video signal
Dot crawl patterns can be completely removed by connecting the display to the signal source through a cable or signal format different from composite video (yellow RCA cable) or a coaxial cable, such as S-Video, which carries the chroma signal in a separate band all its own, leaving the luma to use its entire band, including the usually empty parts when they are needed.
There are three dominant variants of composite video: NTSC, PAL, and SECAM.

Digital Video Broadcasting

DVBDigital Video BroadcastDVB Project
All the countries using SECAM are currently in the process of conversion, or have already converted to DVB, the new pan-European standard for digital television.
Most European countries are fully covered by digital television and many have switched off PAL/SECAM services.

8 mm video format

Hi8Hi-8Video8
Although the older analog camcorders (VHS, VHS-C) were produced in SECAM versions, none of the 8 mm or Hi-band models (S-VHS, S-VHS-C, and Hi-8) recorded it directly.
The 8mm video format refers informally to three related videocassette formats for the NTSC and PAL/SECAM television systems.

YUV

Y'UVYUY2YV12
The color difference signals in SECAM are actually calculated in the YDbDr color space, which is a scaled version of the YUV color space.
The YDbDr color space used in the analog SECAM and PAL-N television broadcasting systems, are also related.

CCIR System A

System AABritish System A
The earlier systems System A & the 819-line systems were the only other systems to use positive video modulation.
System A has variously been tested with the NTSC, PAL and SECAM colour systems.

S-Video

A/VS videoS-Video out
Dot crawl patterns can be completely removed by connecting the display to the signal source through a cable or signal format different from composite video (yellow RCA cable) or a coaxial cable, such as S-Video, which carries the chroma signal in a separate band all its own, leaving the luma to use its entire band, including the usually empty parts when they are needed.
Carrying the color information as one signal means that the color has to be encoded in some way, typically in accord with NTSC, PAL, or SECAM, depending on the applicable local standard.

Antiope (teletext)

Antiope
In both cases, the teletext data was transmitted during the vertical blanking interval, the portion of time allocated for the electron beam to return from the bottom of the screen back up to the top between each frame of the image (which corresponds to a transmission time of 25 lines in each field of PAL or SECAM), and each line used conveyed a fixed number of bytes each cycle: 40 bytes for European systems, 32 in the United States.

Teletext

digital teletextVideotextbroadcast Teletext
In France, where the SECAM standard is used in television broadcasting, a teletext system was developed in the late 1970s under the name Antiope.

Color space

colour spaceabsolute color spacecolorspace
The color difference signals in SECAM are actually calculated in the YDbDr color space, which is a scaled version of the YUV color space.
It is similar to the YUV scheme used in most video capture systems and in PAL (Australia, Europe, except France, which uses SECAM) television, except that the YIQ color space is rotated 33° with respect to the YUV color space and the color axes are swapped.

Chrominance

chromachroma signalcolor
The color information is called chrominance or C for short, while the black-and-white information is called the luminance or Y for short.
Depending on the video standard, the chrominance subcarrier may be either quadrature-amplitude-modulated (NTSC and PAL) or frequency-modulated (SECAM).

Video modulation

However, incompatibility had started with the earlier unusual decision to adopt positive video modulation for French broadcast signals.

Tint control

control
NTSC was considered undesirable in Europe because of its tint problem requiring an additional control, which SECAM and PAL solved.
Since the problem of phase errors in the real world became well known after the introduction of NTSC, the later PAL and SECAM color television standards attempted to correct for them.

Dot crawl

Chroma Crawl
FM modulation of the color information allows SECAM to be completely free of the dot crawl problem commonly encountered with the other analog standards.
However, no comb filter can totally eliminate NTSC artifacts and the only complete solutions to dot crawl are not to use NTSC or PAL composite video, maintaining the signals separately by using S-Video or component video connections instead, or encoding the chrominance signal differently as in SECAM or any modern digital video standard as long as the source video has never been processed using any video system vulnerable to dot crawl.

VHS

videoVHS tapeVHS tapes
Although the older analog camcorders (VHS, VHS-C) were produced in SECAM versions, none of the 8 mm or Hi-band models (S-VHS, S-VHS-C, and Hi-8) recorded it directly. MESECAM is a method of recording SECAM color signals onto VHS or Betamax video tape.

Betamax

BetaBeta TapeBeta-Max
MESECAM is a method of recording SECAM color signals onto VHS or Betamax video tape.