Mnyb wrote: > Do you remeber our tread about "intersample overs" not many DAC > especially older ones shave not acounted for this effect , which in turn > is an artefact of modern record producing . > DAC mfg is often hunting specs so even if some filters alows for gain > adjustments in theri parameters you get better snr if you don't :) so > they just assume perfect recordings
This relates to the function of the newest Benchmark DAC, the DAC2. Pasted below is their brief discussion in their advertising. I think there is a longer discussion somewhere on their website. (I'm not claiming any of this is correct, as I don't know....just pointing out this example). High Headroom DSP - with 3.5 dB "Excess" Digital Headroom All of the digital processing in the DAC2 HGC is designed to handle signals as high as +3.5 dBFS. Most digital systems clip signals that exceed 0 dBFS. The 0 dBFS limitation seems reasonable, as 0 dBFS is the highest sinusoidal signal level that can be represented in a digital system. However, a detailed investigation of the mathematics of PCM digital systems will reveal that inter-sample peaks may reach levels slightly higher than +3 dBFS while individual samples never exceed 0 dBFS. These inter-sample overs are common in commercial releases, and are of no consequence in a PCM system until they reach an interpolation process. But, for a variety of reasons, virtually all audio D/A converters use an interpolation process. The interpolation process is absolutely necessary to achieve 24-bit state-of-the art conversion performance. Unfortunately, inter-sample overs cause clipping in most interpolators. This clipping produces distortion products that are non-harmonic and non-musical . We believe these broadband distortion products often add a harshness or false high-frequency sparkle to digital reproduction. The DAC2 HGC avoids these problems by maintaining at least 3.5 dB of headroom in the entire conversion system. We believe this added headroom is a groundbreaking improvement. *Home:* VortexBox 4TB (2.3) > LMS 7.8 > Transporter, Touch, Boom, Radio (all ethernet) *Cottage:* VBA 3TB (2.3) > LMS 7.8 > Touch > Benchmark DAC I, Boom, Radio w/Battery (all ethernet except Radio) *Office:* Win8(64) > LMS 7.9 > Squeezelite *Spares:* Touch(3), Radio(3), Boom, SB3, CONTROLLER *Controllers:* iPhone6 & iPadAir2 (iPeng8 & Squeezepad), CONTROLLER, or SqueezePlay 7.8 on Win7(64) laptop *Files:* ripping: dbpoweramp > FLAC; post-rip: mp3tag, PerfectTunes; Streaming: Spotify ------------------------------------------------------------------------ garym's Profile: http://forums.slimdevices.com/member.php?userid=17325 View this thread: http://forums.slimdevices.com/showthread.php?t=103842 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
