Прочитал. Вариант джиттеродава - такое делают почти все (правда, все по своему), но в основном в цапах, а не в транспортах.
Вот что по этому поводу пишет Дэн Лаври:
"Yet it matters very much WHERE that jitter is.
It is only important to have the low jitter AT THE CONVERTER, right where the digital is converted to analog. That is the "
conversion jitter" and that is the
jitter that matters. Moving data around can tolerate 100 times the jitter level with no sonic impact. We call that "
data transfer jitter". If we have say huge jitter on say the spdif cable, but we get to "clean it" before it gets to the critical circuitry, then we are doing fine.
And BTW, the real difficulties are much more pronounced at say 20 bit performance where the jitter requirement is 16 times tighter then at 16 bits! As a rule, the signal getting to the DA has much higher jitter than the jitter at the critical circuitry, and the DA clocking circuitry needs to clean it up."
и еще он же:
"Virtually
all DA's have some jitter cleaning circuitry. At the minimum one has some circuit called a PLL (phase lock loop) which cleans up much of the higher frequency jitter content. There are other schemes as well, some are very sophisticated.
And jitter is not only about the timing errors in the signal arriving on some cable into the DA.
Much of the jitter issue has to do with timing errors due to power supply, component and circuit noise, electromagnetic pick up, poor layout...
All that is INSIDE the DA, and that is where most of the issues are."
Я к тому, что все эти клоки и джиттеродавы на транспорте, конечно, не лишние, но все же второстепенные и не определяющие вещи.
