Speed Stability of Record Players
When I tested one uf the used Record Players I bought, the Feickert Adjust+ software showed quite some speed deviations. I was curious to find out more and came across a number of threads on different Internet-Forums regarding plotting the results of a Speed test as polar plot to get a better idea on how the deviation looks like and how to find out the reason of the deviation.
Here is a Collection of Links to keep together what I found out so far.
- The Scott Wurcer python script for polar plotting https://www.audiosciencereview.com/forum/index.php?threads/wow-flutter-w-f-weighted-and-unweighted-jis-din-ccir-and-nab-help-me.10737/page-2#post-300056
- Someone put the Scott Wurcer script in Github https://github.com/FidelisAnalog/TTPolarPlot/
- The Korf Blog has some good Insights in the Measurements of Speed Stability http://korfaudio.com/blog76
- The Pink Fish Media Thread https://pinkfishmedia.net/forum/threads/turntable-speed-analysis.70027/
- The DIY Audio thread which is somehow the successor of the Pink Fish Media Thread https://www.diyaudio.com/forums/analogue-source/309349-turntable-speed-stabilty.html
- A Blog Entry regarding the Analysis of Turntable Speed Stability http://audiamorous.blogspot.com/2009/02/some-thoughts-on-digital-wowflutter.html
- A Method to do Polar Plots "by Hand" http://teribil-audio.com/2012/06/software-based-wow-and-flutter-analysis/
- IQ FM Demodulation of Wow and Flutter Signal in Software https://dsp.stackexchange.com/questions/38601/iq-fm-demodulation-of-wow-and-flutter-signal-in-software
- Python Audio Restoration Suite https://github.com/HENDRIX-ZT2/pyaudiorestoration