  Collective flavor oscillations driven by neutrino-neutrino self interaction
inside core-collapse supernovae have now been shown to bring drastic changes in
the resultant neutrino fluxes. This would in turn significantly affect the
diffuse supernova neutrino background (DSNB), created by all core-collapse
supernovae that have exploded in the past. In view of these collective effects,
we re-analyze the potential of detecting the DSNB in currently running and
planned large-scale detectors meant for detecting both electron neutrinos and
antineutrinos. The next generation detectors should be able to observe DSNB
fluxes. Under certain conducive conditions, one could learn about neutrino
parameters. For instance, it might be possible to determine the neutrino mass
hierarchy, even if theta_{13} is almost zero.
