FORUMS
Can somebody help me understand what does the widening/broadening of central peak, representing the 11.025kHz tone explains/means in the jitter test of dCS Puccini U-Clock?
I have been noticing this phenomenon in all jitter tests where USB was the digital input, e.g. Wavelength Cosecant v3 USB DAC (fig. 12 & 13 of measurement section), Ayre Acoustics QB-9 USB DAC (fig. 14 of measurement section), Musical Fidelity V-DAC (fig. 10 of measurement section). In all cases central peak, representing the 11.025kHz tone is actually two spikes at either side of actual 11.025kHz that are meeting at the top.
Whereas when S/PDIF was the digital input, central peak, representing the 11.025kHz tone, is thick but narrower and never split into two spikes except at bottom, e.g. Bryston BCD-1 CD player (fig. 9 of measurement section), Boulder 1021 disc player (fig. 10 of measurement section), dCS Scarlatti DAC (fig. 16 of measurement section), Lavry Engineering DA2002 D/A processor (fig. 11 of measurement section).
