
Originally Posted by
zonepress
η εγγενώς jitterόπληκτος μεταφορά data μέσω USB
Το εξαιρετικά χαμηλά μετρούμενο (μέτρον > μετρέω ...
) jitter του Benchmark μου θυμίζει την αποστροφή του Watkinson
στο "The Digital Interface Handbook", αποστροφή στην οποία έχω ξανα-αναφερθεί:
"Although it has been documented for many years, attention to control of clock jitter is not as great in actual hardware as it might be. It accounts for much of the slight audible differences between convertors reproducing the same data. A well-engineered convertor should substantially reject jitter on an external clock and should sound the same when reproducing the same data irrespective of the source of the data. A remote convertor which sounds different when reproducing, for example, the same CD via the digital outputs of a variety of CD players is simply not well engineered and should be rejected. Similarly if the effect of changing the type of digital cable feeding the convertor can be heard, the unit is deficient. Unfortunately many consumer external DACs fall into this category, as the steps outlined above have not been taken. Some consumer external DACs, however, have RAM timebase correction which has a large enough correction range that the convertor can run from a local fixed frequency crystal. The incoming clock does no more than control the memory write cycles. Any incoming jitter is rejected totally."
"Θαυμάζω την κομψότητα της μεθόδου σας. Πρέπει να είναι ωραίο να καλπάζεις με το άλογο των αληθινών Μαθηματικών, ενώ εμείς οι υπόλοιποι αγκομαχάμε στον ποδαρόδρομο" - ο Άλμπερτ Άινσταϊν στον Τούλλιο Λέβι-Τσίβιτα