576i is a standard-definition video mode originally used for terrestrial television in most countries of the world where the utility frequency for electric power distribution is 50 Hz. Because of its close association with the colour encoding system, it is often referred to as simply PAL , PAL/ SECAM or SECAM when compared to its 60 Hz ...
576i is a standard-definition video mode originally used for terrestrial television in most countries of the world where the utility frequency for electric power distribution is 50 Hz. Because of its close association with the color encoding system, it is often referred to as simply PAL , PAL/SECAM or SECAM when compared to its 60 Hz (typically, see PAL-M ) NTSC -color-encoded counterpart ...
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576i este un mod video cu definiție standard folosit inițial pentru televiziunea difuzată în majoritatea țărilor lumii în care frecvența utilității pentru distribuția energiei electrice este de 50 Hz. Din cauza asocierii sale strânse cu sistemul de codificare culoare, este adesea menționată simplu ca PAL, PAL/SECAM sau SECAM, în ...
Phase Alternating Line ( PAL) is a colour encoding system for Analog television used in broadcast television systems in most countries broadcasting at 625-line / 50 field (25 frame) per second ( 576i ). It was one of three major analogue colour television standards, the others being NTSC and SECAM .
- 5 MHz
- 1.65+0.4−0.1 μs
- 64.000 μs
576i is a standard-definition video mode originally used for terrestrial television in most countries of the world where the utility frequency for electric power distribution is 50 Hz. Because of its close association with the colour encoding system, it is often referred to as simply PAL, PAL/ SECAM or SECAM when compared to its 60 Hz ...
- Baseband Interoperability
- Modulation For TVRO Transmission
- Use with Progressive Sources
- Pal Speed-Up
- See Also
When 576i video is transmitted via baseband (i.e., via consumer device cables, not via RF), most of the differences between the "one-letter" systemsare no longer significant, other than vertical resolution and frame rate. In this context, unqualified 576iinvariably means 1. 625 lines per frame, of which 576 carry picture content 2. 25 frames per second interlaced yielding 50 fields per second 3. Two interlaced video fields per frame 4. With PAL or SECAMcolor (4.43 MHz or 3.58 MHz (576i-N & 576i-NC)) 5. frequency-modulated or amplitude-modulatedaudio (mono) 6. Mono or stereo audio, if sent via connector cables between devices
576i when it is transmitted over free-to-air satellitesignals is transmitted substantially differently from terrestrial transmission. Full transponder mode (e.g., 72 MHz) 1. Luma signal is frequency-modulated (FM), but with a 50 Hz ditheringsignal to spread out energy over the transponder 2. Chroma is phase-modulated (PM) 3. An FM subcarrier of 4.50, 5.50, 6.0, 6.50 or 6.65 MHz is added for mono sound 4. Other FM subcarriers (usually 7.02, 7.20, 7.38, 7.56, 7.74 and 7.92 MHz) are added for a true-stereo service and can also carry multi-lingual sound and radio services. These additional subcarriers are normally narrower bandwidth than the main mono subcarrier and are companded using Panda 1 or similar to preserve the signal-to-noise ratio. 5. Data subcarriers may also be added Half-transponder mode (e.g., 36 MHz) 1. All of the above is done, but signal is bandwidth-limited to 18 MHz 2. The bandwidth limiting does not affect audio subcarriers
When 576i is used to transmit content that was originally composed of 25 full progressive frames per second, the odd field of the frame is transmitted first. This is the opposite of NTSC. Systems which recover progressive frames, or transcode video should ensure that this field order is obeyed, otherwise the recovered frame will consist of a field from one frame and a field from an adjacent frame, resulting in 'comb' interlacing artifacts.
Template:AnchorMotion pictures are typically shot on film at 24 frames per second. When telecined and played back at PAL's standard of 25 frames per second, films run about 4% faster. This also applies to most TV series that are shot on film or digital 24p. Unlike NTSC's telecine system, which uses 3:2 pull downto convert the 24 frames per second to the 30 fps frame rate, PAL speed-up results in the telecined video running 4% shorter than the original film as well as the equivalent NTSC telecined video. Depending on the sound system in use, it also slightly increases the pitch of the soundtrack by 70.67 cents (0.7067 of a semitone). More recently, digital conversion methods have used algorithms which preserve the original pitch of the soundtrack, although the frame rate conversion still results in faster playback. Conversion methods exist that can convert 24 frames per second video to 25 frames per second with no speed increase, however image quality suffers when conversions of this...
Template:Portal 1. List of common resolutions 2. 4320p, 2160p, 1080p, 1080i, 720p, 576p, 480p, 480i, 360p, 240p 3. Standard-definition television 4. 405-line television system