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I guarantee those spikes are noise encoded in the track either from the recording itself or some sort of issue with the way the file was created. Not that it matters a whole lot given that only your dog could appreciate the flaw.
It's called tape bias. It happens during the tape transfer.
MikeCan you hear the difference between the normal CD and the hirez version of Raising Sand?greetzKyrill
From another HDtracks 24/96 FLAC download: Duke Ellington & Johnny Hodges' Side By Side, the track "Stompy Jones."Never seen anything like this one before: 21K to ~22.7K is flat at approx. -82.5dB, followed by a slow rise to -81dB at ~31K, stays flat to 34K, then a slow fall to the floor (-90dB) at ~45.8K (with a not-surprising bump at 38.5K).Any Ideas?
Since we have a thread for "faux" HiRez, would it be useful (or at least interesting) to have a thread discussing the real deal? I finally got around to trying out HDtracks, and downloaded their 24/96 FLAC of Alison Krauss & Robert Plant "Raising Sand."Out of curiosity, I ran the first track, "Rich Woman," through Audacity to see what the graph looks like. I was surprised by the bumps at ~28.75K & 45K...
The upper spike looks to be at 44.1KHz. Possibly leakage from the CD A/D sample rate clock.
@ Nap: I can half speed it, but I don't understand why:
At half speed the content in the ultrasonic range becomes audible. So you could get an idea what it is. If it sounds like music in "slow motion" then it may be some useful signal. If it sounds like noise then it's noise.You could even do more, like apply a high pass first so you eliminate the 0-20kHz signal then play in half/quarter speed so you could hear only the ultrasonic content.Nap.
I wonder if Chesky's guys are simply tweaking a CD master, and not sourcing the originals. That would explain what I'm seeing on the other graph...
Yeah... that's what we're doing.