The spoofing-aware speaker verification (SASV) challenge was designed to
promote the study of jointly-optimised solutions to accomplish the
traditionally separately-optimised tasks of spoofing detection and speaker
verification. Jointly-optimised systems have the potential to operate in
synergy as a better performing solution to the single task of reliable speaker
verification. However, none of the 23 submissions to SASV 2022 are jointly
optimised. We have hence sought to determine why separately-optimised
sub-systems perform best or why joint optimisation was not successful.
Experiments reported in this paper show that joint optimisation is successful
in improving robustness to spoofing but that it degrades speaker verification
performance. The findings suggest that spoofing detection and speaker
verification sub-systems should be optimised jointly in a manner which reflects
the differences in how information provided by each sub-system is complementary
to that provided by the other. Progress will also likely depend upon the
collection of data from a larger number of speakers.Comment: Accepted to IberSPEECH 2022 Conferenc