Insulation, Radiant and Vapor Barriers - Insulating floor/ceiling in Duplex

I own an old over/under duplex, and live in the lower unit myself. I would like to reduce sound travel betweent he units and have been thinking about blowing in some kind of insulation into the floor from the upstairs unit. What I had in mind was to pull back the carpet in the upstairs unit and blow in insulation into the floor. Can this be done by cutting some small holes in the floor, then patching the holes and re-carpeting? Would this help soundproof between the floors? Is something I could do myself?

Thanks,

Steve

There are products such as rubber mats that are marketed as soundproofing materials.

http://soundproofing.org/infopages/flooring.htm

As with rubber mats, installing insulation would tend to make the floor less acoustical but would not soundproof it, as the acoustical energy of sound such as that transmitted by footsteps is transmitted through the structure.

" For footfalls, there is nothing better than thick carpeting, not because carpets have much sound-stopping power -- they do not -- but because a foot striking a carpet will not produce sound in the first place. This is the reason that some apartment leases contain a clause requiring that all floors be carpeted." Bergman, P. "Soundproofing." UHF Magazine. Retrieved 27 May 2002. http://www.uhfmag.com/Issue63/soundproofing.html