Help Needed to Reduce Installed Generator Noise

Yesterday I did a Bing search for "noise cancelling ear plugs" and learned that several companies including Bose sell "noise masking" and "noise cancelling" ear buds that are practical for use when sleeping. I knew that aviation headsets had this technology but had no Idea that the technology is now small enough for ear plugs. These are "active" devices with miniature batteries.

This may be the simplest solution yet.