Applicant speaker: The speaker using a speaker recognition system at a
given instant. Alternative terms: current speaker, test speaker, unknown
speaker,
customer, user, etc.
Registered speaker: A speaker who belongs to the list of registered
users for a given speaker recognition system . For speaker classification systems, we propose the term
conform speaker (conformant speaker) to qualify a speaker who belongs to one of the classes of
speakers for a given speaker classification system. Alternative terms: reference speaker, valid
speaker, authorised speaker, subscriber, client, etc.
Genuine speaker: A speaker whose real identity is
in accordance with the claimed identity. By extension: a speaker whose actual
character and claimed class are in accordance. Alternative terms: authentic speaker,
true speaker, correct speaker, etc.
Impostor (speaker) : In the context of speaker identification , an
impostor is an applicant speaker who does not belong to the set of registered
speakers . In the context of speaker verification , an impostor is a speaker
whose real identity is different from his claimed identity. Alternative terms:
impersonator, usurpat , etc. For
speaker classification tasks, this concept is better rendered
by the term: discordant speaker.
Identity assignment : Decision outcome which consists in attributing an identity to an applicant speaker , in the context of speaker identification. For speaker classification , the term class assignment should be used instead.
Acceptance : Decision outcome which consists in responding positively to a speaker (or speaker class) verification task.
Rejection : Decision outcome which consists in refusing to assign a registered identity (or class) in the context of open-set speaker identification (or classification), or which consists in responding negatively to a speaker (class) verification trial.
(Speaker) misclassification: Erroneous identity assignment to a registered speaker in speaker identification .
False (speaker) rejection:
Erroneous rejection of a registered speaker or of a genuine speaker in
open-set speaker identification
or speaker verification respectively.
False (speaker) acceptance:
Erroneous acceptance of an impostor in open-set speaker identification
or in speaker verification .
Mistaken speaker: The registered speaker owning the identity assigned erroneously to another registered speaker by a speaker identification system.
Violated speaker: The registered speaker owning the identity assigned erroneously to an impostor in open-set speaker identification system. The registered speaker owning the identity claimed by a successful impostor, in speaker verification.
Text-dependent speaker recognition system: A speaker recognition system for which the training and test speech utterances are composed of exactly the same linguistic material, in the same order (typically, a password).
Text-independent speaker recognition system: A speaker recognition system for which the linguistic content of test speech utterances varies across trials.
Personal-password speaker recognition system: A text-dependent speaker recognition system for which each registered speaker has his own voice password.
Common-password speaker recognition system: A text-dependent speaker recognition system for which all registered speakers have the same voice password.
Fixed-vocabulary speaker recognition system: A text-independent speaker recognition system for which test utterances are composed of words, the order of which varies across speakers and sessions, but for which all the words were pronounced at least once by the speaker when he registered to the system.
Event-dependent speaker recognition system: A text-independent speaker recognition system for which test utterances must contain a certain linguistic event (or class of events) while the rest of the acoustic material is discarded. This approach requires a preliminary step for spotting and localising the relevant events.
Unrestricted text-independent speaker recognition system: A text-independent speaker recognition system for which no constraints apply to the linguistic content of the test speech material .
Text-prompted speaker recognition system: A speaker recognition system for which, during the test phase , a written text is prompted (through an appropriate device) to the user, who has to read it aloud.
Voice-prompted speaker recognition system: a speaker recognition system for which, during the test phase , the user has to repeat a speech utterance, which he listens to through an audio device.
Unprompted speaker recognition system:
A speaker
recognition system
using totally spontaneous speech , i.e. for which the user is totally free to
utter what he wants, or for
which the system has no control over the speaker.