What is the difference between text dependent and text independent voice verification?
The majority of voice verification systems are text dependent, meaning the user must state a specific word, phrase or digit sequence in order to be verified. This is ideal for combining knowledge verification (password, account number) with biometrics. There are some voice biometrics systems that are text independent, meaning a speaker can be verified based on any voice sample. This type of system is most suitable for systems that run in the background, such as for surveillance operations, where it is not possible to prompt the subject to state a specific word or phrase.
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