The building's structure is concrete, as is the floor/roof. The wall to my neighbor is brick; so a lot of noise comes through - TVs, crying babies etc.
I've seen a number of options for constructing various wooden frames with layers of sound insulation; but am wondering if just hanging "curtains" of sound isolation foam could work well. The wall in question is pictured below, and the columns on each side are concrete. Discussions of wooden frames have various approaches to decoupling the sound isolation from the wall being soundproofed - and using curtains seems like a good way to tackle this to me.
Of course; if I ever wanted to use the wall as a wall; I would need a final frame + drywall; but there is enough space to put these on the outside of the concrete pillars.
Any thoughts; comments; suggestions welcome