Monaural noise suppression based on computational auditory scene analysis
First Claim
1. A method for performing noise reduction, the method comprising:
- executing a program stored in a memory to transform a time-domain acoustic signal into a plurality of frequency-domain sub-band signals;
tracking multiple pitched sources within a sub-band signal in the plurality of sub-band signals, the tracking including;
calculating transition probabilities for associations of existing pitch tracks to new pitch candidates,determining a largest of the transition probabilities, andforming associations between the existing pitch tracks and the new pitch candidates according to the largest of the transition probabilities;
generating a speech model and one or more noise models based on the tracked pitch sources; and
performing noise reduction on the sub-band signal based on the speech model and the one or more noise models.
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Abstract
The present technology provides a robust noise suppression system that may concurrently reduce noise and echo components in an acoustic signal while limiting the level of speech distortion. An acoustic signal may be received and transformed to cochlear domain sub-band signals. Features, such as pitch, may be identified and tracked within the sub-band signals. Initial speech and noise models may be then be estimated at least in part from a probability analysis based on the tracked pitch sources. Speech and noise models may be resolved from the initial speech and noise models and noise reduction may be performed on the sub-band signals. An acoustic signal may be reconstructed from the noise-reduced sub-band signals.
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Citations
20 Claims
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1. A method for performing noise reduction, the method comprising:
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executing a program stored in a memory to transform a time-domain acoustic signal into a plurality of frequency-domain sub-band signals; tracking multiple pitched sources within a sub-band signal in the plurality of sub-band signals, the tracking including; calculating transition probabilities for associations of existing pitch tracks to new pitch candidates, determining a largest of the transition probabilities, and forming associations between the existing pitch tracks and the new pitch candidates according to the largest of the transition probabilities; generating a speech model and one or more noise models based on the tracked pitch sources; and performing noise reduction on the sub-band signal based on the speech model and the one or more noise models. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for performing noise reduction in an audio signal, the system comprising:
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a memory; an analysis module stored in the memory and executed by a processor to transform a time-domain acoustic signal to frequency-domain sub-band signals; a source inference engine stored in the memory and executed by a processor to track multiple sources of pitch within the sub-band signals and to generate a speech model and one or more noise models based on the tracked pitch sources, the tracking including; calculating transition probabilities for associations of existing pitch tracks to new pitch candidates, determining a largest of the transition probabilities, and forming associations between the existing pitch tracks and the new pitch candidates according to the largest of the transition probabilities; and a modifier module stored in the memory and executed by a processor to perform noise reduction on the sub-band signals based on the speech model and one or more noise models. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A non-transitory computer readable storage medium having embodied thereon a program, the program being executable by a processor to perform a method for reducing noise in an audio signal, the method comprising:
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transforming an acoustic signal from a time-domain signal to frequency-domain sub-band signals; tracking multiple sources of pitch within the sub-band signals, the tracking including; calculating transition probabilities for associations of existing pitch tracks to new pitch candidates, determining a largest of the transition probabilities, and forming associations between the existing pitch tracks and the new pitch candidates according to the largest of the transition probabilities; generating a speech model and one or more noise models based on the tracked pitch sources; and performing noise reduction on the sub-band signals based on the speech model and one or more noise models. - View Dependent Claims (18, 19, 20)
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Specification