15. A non-transitory computer-readable storage medium comprising instructions for causing one or more processor to: receive a plurality of different spoken utterances from a user; for each of the plurality of different spoken utterances: generate a respective phoneme-independent representation from the spoken utterance, the respective phoneme-independent representation including a respective spectral signature for each of a plurality of frames sampled from the spoken utterance; and decompose the respective phoneme-independent representation to obtain a respective content-independent recognition unit for the user; calculate a content-independent recognition distribution value for the user based on the respective content-independent recognition units generated from the plurality of different spoken utterances; and provide the content-independent recognition distribution value for use in a speaker identification process.
15. A non-transitory computer-readable storage medium comprising instructions for causing one or more processor to: receive a plurality of different spoken utterances from a user; for each of the plurality of different spoken utterances: generate a respective phoneme-independent representation from the spoken utterance, the respective phoneme-independent representation including a respective spectral signature for each of a plurality of frames sampled from the spoken utterance; and decompose the respective phoneme-independent representation to obtain a respective content-independent recognition unit for the user; calculate a content-independent recognition distribution value for the user based on the respective content-independent recognition units generated from the plurality of different spoken utterances; and provide the content-independent recognition distribution value for use in a speaker identification process. 16. The computer-readable storage medium of claim 15 , wherein decomposing the respective phoneme-independent representation for each of the plurality of different spoken utterances further comprises: applying a singular value decomposition to the respective phoneme-independent representation.