Hector Martin on Twitter: "The mastering doesn't matter, because the timecode vinyl's only job is to inform the software of position (relative and absolute). The response to fast/slow scratching is down to the interpolation algorithm. "Noise map" is their marketing term for "an LFSR modulates the 1kHz".… https://t.co/jL2RITcPQe"

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Hector Martin‏ @marcan42 9 Jul 2020

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Replying to @yukkuriyankey

Oh sure, if you're going beyond audio at standard speed then it starts making sense :-)

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ゆっくりヤンキーと言うグレェ「grey」、どうぞよろしくお願いします。‏ @yukkuriyankey 9 Jul 2020

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A lot of DJ mixers intended for DVS use only do 24bit 48KHz presumably to reduce computational load and cost. Some nicer ones do 32bit 96KHz though AFAIK @Serato doesn't support higher sample rates. In theory, I imagine it's possible to recompile @mixxxdj to handle such things.pic.twitter.com/CMoxsFapjt

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Hector Martin‏ @marcan42 9 Jul 2020

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Replying to @yukkuriyankey @Serato @mixxxdj

32bit ADC/DACs aren't a (useful) thing. That's just bullshit marketing. You can't get that level of precision without going to very expensive lab test equipment, at DC, nevermind AC! Those extra 8 bits are just noise.

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Hector Martin‏ @marcan42 9 Jul 2020

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Replying to @marcan42 @yukkuriyankey and

96k is useful when processing is involved (sometimes), though often it makes more sense to resample around specific operations that benefit from higher sample rates (e.g. nonlinear ones) rather than run the whole world at 96k.

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Hector Martin‏ @marcan42 9 Jul 2020

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Replying to @marcan42 @yukkuriyankey and

OTOH 32bit *float* processing makes sense for digital audio, as an intermediate format. I do all my audio work at 32f/48k with 24b I/O (96k not worth the overhead) When I coded FW for a DSP for my speakers I set it up as 24b I/O 32b fixed point processing (no float supp) at 96k.

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Hector Martin‏ @marcan42 9 Jul 2020

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Replying to @marcan42 @yukkuriyankey and

DVS uses a 1kHz pilot tone, so I would expect it to maintain tracking up to 660 RPM or so during scratching, at 48kHz, which seems sufficient? :-)

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ゆっくりヤンキーと言うグレェ「grey」、どうぞよろしくお願いします。‏ @yukkuriyankey 9 Jul 2020

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Replying to @marcan42 @Serato @mixxxdj

Depends on the DVS, some use a 2KHz timecode signal. Other devices can be configured to provide up to a 9999Hz signal. Though, yes, Serato uses a 1KHz timecode signal. It tends to be much more noticeable with *slow* skratchin':https://www.youtube.com/watch?v=fTj-L7EKCL8 …

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Hector Martin‏ @marcan42 9 Jul 2020

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Replying to @yukkuriyankey @Serato @mixxxdj

I get the feeling that's mostly down to the software. Sample rate shouldn't matter for slow scratching, and honestly most vinyl rigs aren't going to have a noise floor sub 16 bit.

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Hector Martin‏ @marcan42 9 Jul 2020

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Replying to @marcan42 @yukkuriyankey and

Is it possible that Serato isn't applying RIAA equalization properly for their DVS? Slow scratching is supposed to sound deeper/warmer due to that. If they're just interpolating in flat response domain that would explain it.

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ゆっくりヤンキーと言うグレェ「grey」、どうぞよろしくお願いします。‏ @yukkuriyankey 9 Jul 2020

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Replying to @marcan42

That would probably come down to how the timecode vinyl is mastered which I can't speak to personally. I know Serato timecode vinyl has something called a "noise map" beyond the 1000Hz control tone but that's about it.

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Hector Martin‏ @marcan42 9 Jul 2020

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Replying to @yukkuriyankey

The mastering doesn't matter, because the timecode vinyl's only job is to inform the software of position (relative and absolute). The response to fast/slow scratching is down to the interpolation algorithm. "Noise map" is their marketing term for "an LFSR modulates the 1kHz".

12:17 PM - 9 Jul 2020

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1. Hector Martin‏ @marcan42 9 Jul 2020
  
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  (which is how they get absolute position out of it, and it's the obvious non stupid solution to this problem, see e.g. GPS which does vaguely the same thing)
  
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