Speaker Embedding
A fixed-dimensional dense vector intended to encode speaker-related characteristics from a speech segment.
Representation
A speaker embedding maps a variable-length speech segment into a fixed-dimensional vector. The objective is for segments from the same speaker to occupy nearby regions of the learned space while different speakers are separated.
Comparison
Verification systems can score two embeddings with cosine similarity, PLDA or another backend. In diarization, embeddings are commonly used as the representation supplied to clustering.
The model, segmentation strategy and decision threshold have to be validated together.
Data Quality
Segment duration, overlapping speech, channel, codec, noise and domain mismatch can all affect the vector. A short or incorrectly segmented input can produce an unreliable representation even with a strong model.
An embedding is not a content-free identity number. Biometric use also requires explicit storage, access-control and privacy decisions.
Related Concepts
Related article: Audio Feature Vectors and Matching