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Learn about the three TV standards created by different countries and how they differ in lines, frames, color encoding, and cost. Find out which countries use NTSC, PAL, or SECAM and why they are incompatible with each other.
13 Δεκ 2021 · Learn the differences and similarities between NTSC, PAL, and SECAM, the three main video format standards used in different countries. Find out how they affect the picture quality and compatibility of your Sony products.
Phase Alternating Line (PAL) is a colour encoding system for analog television. It was one of three major analogue colour television standards, the others being NTSC and SECAM. In most countries it was broadcast at 625 lines, 50 fields (25 frames) per second, and associated with CCIR analogue broadcast television systems B, D, G, H, I or K.
Ήταν ένα από τα τρία κύρια πρότυπα αναλογικής έγχρωμης τηλεόρασης, ενώ τα άλλα δύο ήταν τα PAL και NTSC. Όλες οι χώρες που χρησιμοποιούν το SECAM βρίσκονται επί του παρόντος σε διαδικασία μετατροπής ή έχουν ήδη μετατραπεί σε Digital Video Broadcasting (DVB), το νέο πανευρωπαϊκό πρότυπο για την ψηφιακή τηλεόραση.
Multi-standard video monitors were already in use in Europe to accommodate broadcast sources in PAL, SECAM, and NTSC video formats. The heterodyne color-under process of U-Matic, Betamax & VHS lent itself to minor modification of VCR players to accommodate NTSC format cassettes.
SECAM differs significantly from the other color systems by the way the color difference signals are carried. In NTSC and PAL, each line carries color difference signals encoded using quadrature amplitude modulation (QAM). To demodulate such a signal, knowledge of the phase of the carrier signal is needed.
To fully understand the NTSC, PAL, and SECAM encoding and decoding processes, it is helpful to review the background of these standards and how they came about. Learn more about Chapter 8: NTSC, PAL, and SECAM Overview on GlobalSpec.
