Improve sound insulation in the ceiling and partition walls

Hello We have a single-family house with an exposed wooden beam ceiling on the ground floor, on which an exposed formwork was applied, 4 cm impact sound insulation, 8 cm rigid foam/Styrofoam insulation, floating cement screed with underfloor heating, and 80% of the floor covering is laminate, the rest tile (in the bathroom). The interior walls on the ground floor consist of a KVH battens (8x6 cm) with 12 mm OSB and 12.5 mm drywall on both sides, and in the 8 cm cavity a 60 mm thick Rockwool partition board was installed. The building is from 2012, so not very old. We want to improve the sound insulation between the upper/lower floors and between the interior walls on the ground floor. The problem is that, for example, when lying in bed in the children's room upstairs, you can hear the TV below so clearly that you can almost understand every word. This disturbs the children a lot when sleeping. Conversely, it disturbs downstairs when the children play upstairs (when the little one walks through the room it sounds downstairs as if a stomper is running around, or when, for example, toy cars zip across the floor you can hear it clearly below). On the ground floor, between the living and bedroom, it is also very noisy; when the TV is on in the living room or someone coughs, sleeping is not possible. Of course, the basic principle can be replaced/changed... What are the possibilities to improve the sound insulation? We would give up the exposed beam ceiling on the ground floor anyway, as it is not as nice as hoped and my wife does not like it. Best regards

So, not much can be done on the floor. Still, I would see if a carpet can be laid on it. And underneath, the ceiling can be suspended. Beams with mineral wool (I would prefer wood fiber because of the fibers), triple-layered with drywall. I would have this planned by a professional because the proper decoupling and damping are very important. Of course, a few centimeters of room height will be lost. Actually a good example of why a solid massive construction is best.

You mean mineral wool/wood fiber above the drywall or between the wooden beams?

Well, in our previous house the construction was identical (just not as well insulated) where the ceiling beams did not run all the way through but were laid per room and rested on a load-bearing interior wall. I guess a lot of sound goes through the 9-meter-long ceiling beams from the living room to the bedroom on the ground floor (kind of like a tin can phone) and yes, no idea why it’s worse here than in the previous house up to the upper floor, as I don’t know the floor structure on the upper floor in detail or the structure of the exterior wall (certainly a lot also goes upwards here)

So, a beam structure decoupled from the ceiling. Under this beam structure [Gipskarton] and between/on the beams, that is [Gipskartonplatten], the insulation. But in any case, have it planned by a professional who knows the overall construction. It won’t be cheap. With a wooden ceiling spanning 9 meters, it really isn’t surprising that sound passes through.

Ah ok now I understand, basically not letting the sound reach the ceiling beams at all... The next point would then be to check to what extent the sound travels through the walls into the upper floor... Hm ok then I will start looking for someone who knows about this and can also measure such things...