Information technology - Generic coding of moving pictures and associated audio information - Part 9: Extension for real time interface for systems decoders (ISO/IEC 13818-9:1996, IDT)
This Malaysian Standard does not address decoder requirements related to clock acquisition and slew rate constraints. For example, suppose a system utilizes the 27 MHz system clock to derive an ITU-R PAL chroma clock of 4.434 MHz, with a 0.1 Hz/set slew rate limitation. With a source clock of 0.1 ppm accuracy, a decoder clock of 30 ppm accuracy, and straightforward phase-locked loop clock recovery circuitry, a decoder could require about 305 000 bits to prevent buffer under/overflow during frequency acquisition, even with low-jitter delivery. The actual number of bits a decoder requires for this purpose could be higher or lower, depending on the implementation.
Published
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PDF
07/05/2020
15
NSC 07 - Information Technology, Communications & Multimedia
