[QUOTE=jamescooley1;2535742]Yamaha’s advanced Audio Master Quality Recording (AMQR) system, burns larger “pits” and “lands” into the disc surface, theoretically resulting in a better-sounding, more durable CD. In our listening tests, we noticed slightly superior dynamics in the AMQR-recorded CD, but only by the slimmest of margins. In any case, we appreciate any technology that will extend the life of our discs. [I]–Gordon Goble[/I]
Jitter is no concern-eh. Well it is to me-sorry. Also the book you mention is 7 years old.[/QUOTE]
I would say it’s a marketing doc. Burning long pits & lands does not imply that motors in CD players will read them with less jitter, and as for listening tests let’s not forget about the placebo effect.
Digital bits on a CD are recorded as Manchester Encoded or RLL (Run Length Limited). So a group of bits are recorded as a length from 3 to 11 T units, where T = can be from 1.2m/s to 1.4m/s. Simply put a CD consists of recorded strips of pits and lands whose lengths represent whole numbers of 3T to 11T.
The laser in a CD player needs to read of these lengths. It measures them by timing how long it takes for a transition to occur. Naturally the measurements won’t be exact (jitter), e.g. the CD player could measure lengths like 2.9, 3.1, 3.2 etc for a 3T length, which is rounded to a whole number by the PLL chip. You will get this even if the pits and lands were burned longer, because the problem lies with the measurement being an analogue process.