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Frequency Response of Vinyl, Split from "To get into vinyl, or not?" (TOS #5)
almostmitch
post Dec 3 2012, 20:15
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QUOTE (botface @ Dec 3 2012, 13:49) *
I guess you can expect a factory installed arm/cartridge to be set up properly. I'd still want to check though even if only for reassurance that things haven't gone "off" in transit.


This was something I considered. I will most likely double check things, because as you implied, you never know what kind of beating the box took in transit.
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BFG
post Dec 4 2012, 00:16
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This whole conversation has me intrigued about the technical limitations of vinyl. For example, is there a minimum or maximum frequency that can be "encoded" in vinyl (akin to the ~20Hz and 44.1kHz cutoffs on digital CDs)? Does this differ for 33s, 45s, 78s? Is there a way (based on the needle tip and equipment setup) for a knowledgeable person to precalculate the bands that the most noise interference will likely be in, and thus minimize or remove it? Etc.

It's particularly pertinent as I'm planning to attempt a vinyl-to-FLAC encoding soon.

This post has been edited by BFG: Dec 4 2012, 00:17
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Axon
post Dec 4 2012, 09:01
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High frequency vinyl noise is strongly broadband, so there's little use shifting that around, per se.

The arm+cartridge resonance defines the low frequency limit. If you're lucky, it will be 8-12hz; if unlucky, 5-20hz.

The HF limit is dependent on many factors, but at the very least, CD4 records go all the way to 45khz. Typically, you'll know if you have a CD4 record. Otherwise, the useful frequency range limit might be as low as 15khz, or as high as 20-30khz.

Hypothetically, on arm+cart combinations which are too low (<8hz), it might make sense to e.g. play a 33rpm record at a much faster speed, so as to shift the signal spectrum away from the resonance, because spot frequency SNR is ludicrously low around resonance. But AFAIK, that's probably more trouble than it's worth.
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splice
post Dec 5 2012, 01:17
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QUOTE (Axon @ Dec 4 2012, 00:01) *
... The HF limit is dependent on many factors, but at the very least, CD4 records go all the way to 45khz. ...


The 4 channels of a CD-4 disc were limited to 15 KHz. Each rear channel difference signal was modulated onto a 30 KHz carrier. The cartridges had significant distortion and frequency response variations above 20 KHz or so, but because the modulation method was FM based the demodulated signal was acceptable provided the disc and stylus were in good condition.


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mzil
post Dec 5 2012, 01:46
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QUOTE (splice @ Dec 4 2012, 20:17) *
QUOTE (Axon @ Dec 4 2012, 00:01) *
... The HF limit is dependent on many factors, but at the very least, CD4 records go all the way to 45khz. ...

The cartridges had significant distortion and frequency response variations above 20 KHz or so,

Just a few dB off, even up to 45 kHz, isn't very significant in my book.
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