US Patent 7694460 Tuned window sash

A window pane having a window sash attached thereto to reduce noise transmitted through the window pane. The window sash comprising a bracket and tuned mass damper attached to the bracket at one or more spaced intervals. The one or more spaced intervals are adjusted to tune the window sash to a targeted frequency to reduce the noise transmitted through the window pane. The targeted frequency may be the coincidence frequency of the window pane. The stiffness and/or mass of the bracket and tuned mass damper can also be chosen to reduce the noise transmitted through the window pane.