Discovering criminal and terrorist networks is the primary task of law enforcement and intelligence agencies across Europe. Criminals and terrorists use voice communication over different media. While the personal communication within their networks is usually performed within standard mobile networks and VoIP-type communications (skype, Google Hangouts, others), there might be a significant share of voice in public media, typically hate or propaganda speech on Youtube, Facebook or other social media channels. Determining and tracking target identities across such channels is extremely difficult, and speaker identification (SID) techniques (such as investigated in the European SiiP project) might not be effective in such challenging environments considering isolated data from one speaker only.
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