In article , Gareth Halfacree
wrote:
Rob wrote:
I'd never thought of that 33s at 45 ruse to save time - does it
actually degrade quality?

Indeed it does.

If you run your 33s at 45 RPM, then every second of captured audio
contains 32,340 samples. Because these are played back at the rate of
44,100 samples per second it sounds too fast, so you have a choice of
either dropping the sample rate to 32,000 (32KHz, often referred to as
'Radio Quality' in older Windows applications)

Yes. I've not checked the URL but if they don't make a suitable correction,
then replying a 33 at 45 would also mean the standard RIAA correction would
be inappropriate, thus altering the frequency response. May also encounter
problems with the stylus being able to track the increased modulation
velocities, etc.

In principle, the above could be corrected during the resampling from 33k
up to 44.1k, but as you say, the result would still lose any info above
16kHz.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html