About PAL(Phase Alternating Line)?

The PAL (shot for Phase Alternating Line) TTV standard was introduced in earlier 1960's in Europe. It's better Resolution than NTSC, having 576 lines from the Active Section of the Frame. The frame-rate, however, is slightly lower at 25fps.

PAL is employed in most from the eu countries, Australia, some countries of Africa, some countries of South usa plus some Asian countries. There are several versions of PAL, most often used method called PAL B/G, but others include PAL I (found in great britain and Ireland) and PAL M (a hybrid standard, that's a similar resolution as NTSC has, but uses PAL transmission and color coding technology). These types of standards normally work nicely together, but audio frequencies might vary and for that reason you need to be sure your appliances work in the country you intend to use them.



PAL commonly has 576 visible lines in contrast to 480 lines with NTSC, which means that PAL carries a 20% higher resolution. Both PAL and NTSC possess a higher frame rate than film, 24 fps, offering flicker-free motion. Most TV output for PAL and NTSC use interlaced frames meaning that even lines update on one frame and odd lines update for the next frame. Interlacing frames provides a smoother motion with half the frame rate, the negative effects is to use scene changes.

NTSC is utilized having a fps of 60i or 30p whereas PAL generally uses 50i or 25p; both use a sufficient frame rate to give the illusion of fluid motion. That is because that NTSC is generally found in countries with a Utility frequency of 60 Hz and PAL in countries with 50 Hz,

however a variety of exceptions. PAL has a closer frame rate thereto of film and is particularly not as likely in order to issues caused during frame rate conversion. Artefacts due to frame rate conversion required when video continues to be recorded in the wrong rate for that display can be severe. NTSC receivers have a very tint control to execute colour correction manually. Via a adjusted correctly, the colours might be faulty. The PAL standard automatically cancels hue errors by phase reversal, so a tint control is unnecessary. Chrominance phase errors inside the PAL system are cancelled out employing a 1H delay line contributing to lower saturation, which can be a lot less noticeable on the eye than NTSC hue errors. However, the alternation of colour information—Hanover bars—can result in picture grain on pictures with extreme phase errors even in PAL systems, if decoder circuits are misaligned or make use of the simplified decoders of early designs (typically to get rid of royalty restrictions). Generally such extreme phase shifts tend not to occur. This effect will often be viewed when the transmission path is poor, typically in piled up areas or the location where the terrain is unfavourable. The effects is much more noticeable on UHF than VHF signals as VHF signals are usually robust. PAL and NTSC have slightly divergent colour spaces, though the colour decoder differences listed here are ignored


PAL vs. SECAM SECAM transmissions tend to be robust over longer distances than NTSC or PAL. However, because of their FM nature, the colour signal remains present, although at reduced amplitude, even just in monochrome portions from the image, thus being at the mercy of stronger cross colour. Like PAL, a SECAM receiver requires a delay line, but unlike PAL, it's not at all possible to make a SECAM receiver without one. SECAM is an earlier work for balance compatible colour television which also tries to settle the NTSC hue problem. It does so by making use of an alternative approach to colour transmission, namely alternate transmission in the U and V vectors and FM, while PAL tries to improve within the NTSC method.

                      winx dvd ripper platinum                     winx hd video converter delux

^ Back to Top