Low Cost Turntable - Incredible Performance

@thecarpathian 

May I ask, are you of Irish descent

The only bits of me that are remotely Irish would have been assembled from Guinness molecules! 

The British car industry was doomed by its reliance on electrics from Lucas, known locally as the Prince of Darkness

@fa8362 and @richardbrand ​​​​​​, his use of "your" was correct. 

@richardbrand ,

In the U.S. he’s also known as The Man who Invented Dark.

I ask about your lineage because your picture screams Dubliner to me!

@ericrhodes1 

his use of "your" was correct

In 3 of 5 goes, yes it was correct.  The other two times were wrong, the last after his error was pointed out!  I don't think his contribution is worth the acrimony ... my highlights and thumbs up and down below

Your  not a quality person with your  comment

Pdvonnahme. public or not your  insult is ridiculous.. Again go away your  not much as a person spewing your  junk

@oberoniaomnia 

Found an article which may help!  Virtins Sound Card Instrument Manual.

It describes how software called Multi-Instrument can be used with a PC sound card to measure turntable wow, and flutter.  More importantly, it has an excellent description of what wow, flutter, drift and scrape are.  It talks about Fourier transforms to convert the output signal from the time domain to the frequency domain, and how we are really trying to output a Frequency Modulated (FM) signal.

There’s remarkably little Chinglish and reference to quite a variety of standards which are mainly equivalent.

There is a major outlier however with the Japanese standard.

Wow and flutter (W&F) is often expressed in terms of peak or RMS value of the frequency deviation. The former is adopted in AES6-2008(r2012) while the latter is used in JIS.

Obviously, the Root Mean Square value is less than the peak value so turntables rated using the JIS standard (typically Japanese ones) will appear to have lower wow and flutter than those rated using the AES standard.

Wow and flutter measurements go way back before computers, Fast Fourier Transforms and Digital Signal Processing, and the earlier versions of the standards described analog methods of returning the FM signal.

in classical music, sustained notes are smeared with vibrato

That’s why the frequency (not amplitude) beating effect is most easily heard with instruments that do not have the vibrato option - such as piano and clarinet - and not with strings or trombones.  In theory!