UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Test Gear and Workshop Equipment

Notices

Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

Closed Thread
 
Thread Tools
Old 7th Jul 2016, 9:52 pm   #1
wd40addict
Heptode
 
wd40addict's Avatar
 
Join Date: May 2009
Location: Stevenage, Herts. UK.
Posts: 724
Default Audacity based Wow & Flutter Visualiser

Recent acquisition of a wow & flutter meter has given me the ability to measure average levels, but it is also useful to actually be able to see the unsteadiness. The attached plug-in allows Audacity to display the wow & flutter contained in imported, or recorded audio.

The attached file needs to be unzipped and the resulting *.ny file needs to be copied to your Audacity Plug-Ins directory and, if you're using a recent version, enabled in the 'manage' function.

This done a new item 'Wow and Flutter Visualiser' will appear under the 'Analyze' menu (see picture). Now record a 3kHz or 3.15kHz mono tone from a test disc or tape.

The recording should look like the 'Before' picture (this is a recording of the 3kHz tone from LXT5346). Now click on 'Wow and Flutter Visualiser' and the file will be analysed and look something like the 'After' picture. + and -1 represent +/-1% peak wow and flutter.

The data is presented raw, there is no RMS or weighting so any defects can be clearly seen. This trace is from a modern AT-120LP direct drive turntable and probably represents the limits of my test disc.

Finally the comparison picture shows the results from the AT and some vintage turntables. Top trace is the AT, second down is the Collaro 4T200 (results very similar to the AT, so again probably the limit of the disc). Third down is my Garrard 301 - slightly worse. Finally the Goldring-Lenco GL58 which is a lot worse.

Regards,

Paul
Attached Thumbnails
Click image for larger version

Name:	Analyse.png
Views:	156
Size:	10.6 KB
ID:	127158   Click image for larger version

Name:	Before.png
Views:	176
Size:	35.6 KB
ID:	127159   Click image for larger version

Name:	After.png
Views:	177
Size:	39.5 KB
ID:	127160   Click image for larger version

Name:	Comparisons.png
Views:	188
Size:	145.8 KB
ID:	127161  
Attached Files
File Type: zip wow_flutter_visualiser.zip (578 Bytes, 94 views)
wd40addict is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 12:42 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2019, Paul Stenning.