Speech signal separation and synthesis based on auditory scene analysis and speech modeling

Patent metadata

Field	Value
Publication number	US-9536540-B2
Application number	US-201414335850-A
Country	US
Kind code	B2
Filing date	Jul 18, 2014
Priority date	Jul 19, 2013
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

Provided are systems and methods for generating clean speech from a speech signal representing a mixture of a noise and speech. The clean speech may be generated from synthetic speech parameters. The synthetic speech parameters are derived based on the speech signal components and a model of speech using auditory and speech production principles. The modeling may utilize a source-filter structure of the speech signal. One or more spectral analyzes on the speech signal are performed to generate spectral representations. The feature data is derived based on a spectral representation. The features corresponding to the target speech according to a model of speech are grouped and separated from the feature data. The synthetic speech parameters, including spectral envelope, pitch data and voice classification data are generated based on features corresponding to the target speech.

First claim

The invention claimed is:

1. A method for generating clean speech from a mixture of noise and speech, the method comprising:
deriving speech parameters, based on the mixture of noise and speech and a model of speech, the deriving using at least one hardware processor, wherein the deriving speech parameters comprises:
performing one or more spectral analyses on the mixture of noise and speech to generate one or more spectral representations;
deriving, based on the one or more spectral representations, feature data;
grouping target speech features in the feature data according to the model of speech;
separating the target speech features from the feature data; and
generating, based at least partially on the target speech features, the speech parameters; and

synthesizing, based at least partially on the speech parameters, clean speech.

2. The method of claim 1 , wherein candidates for the target speech features are evaluated by a multi-hypothesis tracking system aided by the model of speech.

3. The method of claim 1 , wherein the speech parameters include spectral envelope and voicing information, the voicing information including pitch data and voice classification data.

4. The method of claim 3 , further comprising, prior to grouping the feature data, determining, based on a noise model, non-speech components in the feature data.

5. The method of claim 4 , wherein the pitch data are determined based, at least partially, on the non-speech components.

6. The method of claim 4 , wherein the pitch data are determined based, at least on, knowledge about where noise components occlude speech components.

7. The method of claim 5 , further comprising, while generating the speech parameters:
generating, based on the pitch data, a harmonic map, the harmonic map representing voiced speech; and
estimating, based on the non-speech components and the harmonic map, an unvoiced speech map.

8. The method of claim 7 , further comprising extracting a sparse spectral envelope from the one or more spectral representations using a mask, the mask being generated based on a harmonic map and an unvoiced speech map.

9. The method of claim 8 , further comprising estimating the spectral envelope based on a sparse spectral envelope.

10. The method of claim 3 , wherein the pitch data are interpolated to fill missing frames before synthesizing clean speech.

11. A system for generating clean speech from a mixture of noise and speech, the system comprising:
one or more processors; and
a memory communicatively coupled with the processor, the memory storing instructions which if executed by the one or more processors perform a method comprising:
deriving speech parameters, based on the mixture of noise and speech and a model of speech, wherein the deriving speech parameters comprises:
performing one or more spectral analyses on the mixture of noise and speech to generate one or more spectral representations;
deriving, based on the one or more spectral representations, feature data;
grouping target speech features in the feature data according to the model of speech;
separating the target speech features from the feature data; and
generating, based at least partially on the target speech features, the speech parameters; and

synthesizing, based at least partially on the speech parameters, clean speech.

12. The system of claim 11 , wherein candidates for the target speech features are evaluated by a multi-hypothesis tracking system aided by the model of speech.

13. The system of claim 11 , wherein the speech parameters include a spectral envelope and voicing information, the voicing information including pitch data and voice classification data.

14. The system of claim 13 , further comprising, prior to grouping the feature data, determining, based on a noise model, non-speech components in the feature data.

15. The system of claim 14 , wherein the pitch data are determined based partially on the non-speech components.

16. The system of claim 14 , wherein the pitch data are determined based, at least on, knowledge about where noise components occlude speech components.

17. The system of claim 15 , further comprising, while generating the speech parameters:
generating, based on the pitch data, a harmonic map, the harmonic map representing voiced speech; and
estimating, based on the non-speech components and the harmonic map, an unvoiced speech map.

18. The system of claim 15 , further comprising extracting a sparse spectral envelope from the one or more spectral representations using a mask, the mask being generated based on a harmonic map and an unvoiced speech map.

19. The system of claim 18 , further comprising estimating the spectral envelope based on the sparse spectral envelope.

20. A non-transitory computer-readable storage medium having embodied thereon a program, the program being executable by a processor to perform a method for generating clean speech from a mixture of noise and speech, the method comprising:
deriving speech parameters, based on the mixture of noise and speech and a model of speech, via instructions stored in the memory and executed by the one or more processors, wherein the deriving speech parameters comprises:
performing one or more spectral analyses on the mixture of noise and speech to generate one or more spectral representations;
deriving, based on the one or more spectral representations, feature data;
grouping target speech features in the feature data according to the model of speech;
separating the target speech features from the feature data; and
generating, based at least partially on the target speech features, the speech parameters; and

synthesizing, based at least partially on the speech parameters, via instructions stored in the memory and executed by the one or more processors, clean speech.

Assignees

• Knowles Electronics Llc

Inventors

• Avendano Carlos
• Klein David
• Woodruff John
• Goodwin Michael M

Classifications

• G10L21/0272 Primary

  Voice signal separating · CPC title

• G10L21/0208

  Noise filtering · CPC title