darrenyeats wrote: > I have a question about this. > http://www.stereophile.com/content/quality-lies-details-page-6#DQEqFEA63RHRhQcK.97 > > I thought such a waveform would be impossible with 16 bit data when fed > into an upsampling, 24 bit DAC. I thought the samples would be > interpolated at higher rate and greater bit depth, leading to a smooth > sine even at -90dB. But looking at any number of reviews on Stereophile, > the stair steps (with Gibbs ringing) are seen. > > I infer that the "16 bit undithered sine at -90dB" is a deliberately > staircased waveform delivered in a hi-rez container. My question: is > this inference correct? If not, DAC upsampling doesn't quite do what I > thought it did!
Note the explanation. "Fig.8 shows the ideal waveshape (assuming an infinite bandwidth);", so the so-called "signal" is actually just a simulated graphic (as a real system wouldn't have infinite bandwidth). It continues with "a nearly perfect reproduction of this signal is shown in fig.9, which overlays the fig.8 waveform with small amounts of Gibbs Phenomenon ringing at the bit transitions owing to the CD system's limited, 22kHz bandwidth.", leading me to think that that waveform, too, only exists in a plotting program, not as a real signal. "To try to judge the real from the false will always be hard. In this fast-growing art of 'high fidelity' the quackery will bear a solid gilt edge that will fool many people" - Paul W Klipsch, 1953 ------------------------------------------------------------------------ Julf's Profile: http://forums.slimdevices.com/member.php?userid=42050 View this thread: http://forums.slimdevices.com/showthread.php?t=105769 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
