Method and apparatus for training a text independent speaker recognition system using speech data with text labels

1. A Hidden Markov Model (HMM) speaker recognition system, comprising:

at least one data storage unit; and

at least one processor programmed to:

create a Gaussian Mixture Model (GMM) by pooling Gaussians from a plurality of HMM states; and

normalize Gaussian weights with respect to the plurality of HMM states to provide a Text Independent (TI) speaker recognition mode in the HMM speaker recognition system;

wherein the HMM speaker recognition system is selected from a group consisting of a Text Dependent (TD) HMM speaker recognition system and a Text Constrained (TC) speaker recognition system.

2. The system of claim 1 , wherein said at least one processor is further programmed to:

in creating the GMM, derive a GMM Universal Background Model (UBM) from an HMM UBM and/or derive a speaker specific GMM from a speaker specific HMM.

3. The system of claim 1 , wherein said at least one processor is further programmed to:

normalize the Gaussian weights based on durations of the plurality of HMM states and/or normalize the Gaussian weights by dividing each of the Gaussian weights by an overall number of the plurality of HMM states.

4. The system of claim 1 , wherein the HMM speaker recognition system is based on a single HMM per word, a single HMM per phonetic unit, and/or a single HMM per sub-phonetic unit.

5. A Text Independent (TI) Gaussian Mixture Model (GMM) speaker recognition system, comprising:

at least one data storage unit; and

at least one processor programmed to:

create a Hidden Markov Model (HMM) by assigning states to Gaussians from a GMM; and

calculate state transition probabilities and Gaussian weights with respect to a plurality of HMM states to provide a Text Dependent (TD) HMM speaker recognition mode and/or a Text Constrained (TC) HMM speaker recognition mode in the TI GMM speaker recognition system.

6. The system of claim 5 , wherein said at least one processor is further programmed to:

in creating the HMM, derive a HMM Universal Background Model (UBM) from a GMM UBM and/or derive a speaker specific HMM from a speaker specific GMM.

7. The system of claim 5 , wherein said at least one processor is further programmed to:

calculate the state transition probabilities and the Gaussian weights based on durations of the plurality of HMM states and/or based on only an overall number of the plurality of HMM states.

8. The system of claim 5 , wherein the Text Dependent (TD) Hidden Markov Model (HMM) speaker recognition mode and/or the Text Constrained (TC) HMM speaker recognition mode is based on a single HMM per word, a single HMM per phonetic unit, and/or a single HMM per sub-phonetic unit.

9. A first Hidden Markov Model (HMM) speaker recognition system, comprising:

at least one data storage unit; and

at least one processor programmed to:

create an HMM with a smaller number of states or a larger number of states by pooling Gaussians from a plurality of HMM states into a single HMM state or splitting the Gaussians from the plurality of HMM states into different HMM states, respectively; and

normalize Gaussian weights with respect to the HMM states to provide a TD HMM speaker recognition mode and/or a TC HMM speaker recognition mode in a second HMM speaker recognition system;

wherein the first HMM speaker recognition system is selected from a group consisting of a Text Dependent (TD) HMM speaker recognition system and a Text Constrained (TC) speaker recognition system.

10. The system of claim 9 , wherein said at least one processor is further programmed to:

in creating the HMM, derive a first HMM Universal Background Model (UBM) from a second HMM UBM and/or derive a first speaker specific HMM from a second speaker specific HMM.

11. The system of claim 9 , wherein said at least one processor is further programmed to:

normalize the Gaussian weights based on HMM state durations and/or normalize the Gaussian weights by dividing each of the Gaussian weights by an overall number of the HMM states.

12. The system of claim 9 , wherein the second HMM speaker recognition system includes a single HMM per phoneme and/or a single HMM per phonetic unit, and the TD HMM speaker recognition mode and/or the TC HMM speaker recognition mode includes a single HMM per word.

13. The system of claim 9 , wherein the second HMM speaker recognition system includes a single HMM per word and the TD HMM speaker recognition mode and/or the TC HMM speaker recognition mode includes a single HMM per phrase.