You are actually using TAL-U-NO-62 ? Or TAL-U-NO-LX ?
If you have downloaded and installed TAL-U-NO-LX it is absolutely normal to hear the plug-in fading in a white noise sound every minute as long as you haven't registered it.
If you have really downloaded and installed TAL-U-NO-62 it is absolutely impossible to hear that white noise every now and then... simply because there is neither restriction at all nor any ad at all in that totally free tool.
Conclusion : you have downloaded and installed TAL-U-NO-LX instead of TAL-U-NO-62. That's all.