Gandalf-a Swedish telephone speaker verification database

The Gandalf speech database has been designed for use in research on automatic speaker verification. 86 customer speakers have been recorded in up to 24 telephone calls per speaker during a period of up to 12 months, and an additional 100 impostor speakers are currently being recorded. In addition to speech files, Gandalf includes a relational database with a twofold function: it stores information on subjects and calls, and it is a tool for making quantitative and qualitative analyses of speaker verification test data. The customer speaker part of the database is described, and some of the motivation behind the design is given. A small speaker verification experiment is then described that demonstrates how test results can be qualitatively analyzed using the relational database