Acoustic signal enhancement system
First Claim
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1. A method for enhancing an input signal, the method comprising:
- determining a time-frequency representation of a noisy input signal;
estimating a background noise level and a signal-to-noise ratio;
determining a matching low noise signal template for the time-frequency representation; and
replacing a portion of the time-frequency representation with a mix of the time-frequency representation and the matching low noise signal template, the mix weighted by the signal-to-noise ratio.
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Abstract
A signal enhancement system improves the quality of a noisy input signal. The system finds a low noise signal model which best matches the noisy input signal. Noisy portions of the input signal are replaced with portions of the low noise signal models. As the input signal increases in noise content, the output signal includes an increasing amount of the low noise signal model. The system thereby produces an output signal with very low noise which corresponds to the input signal.
33 Citations
25 Claims
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1. A method for enhancing an input signal, the method comprising:
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determining a time-frequency representation of a noisy input signal;
estimating a background noise level and a signal-to-noise ratio;
determining a matching low noise signal template for the time-frequency representation; and
replacing a portion of the time-frequency representation with a mix of the time-frequency representation and the matching low noise signal template, the mix weighted by the signal-to-noise ratio. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9)
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4. The method of claim 4, where the multiple low noise signal templates comprise low noise spectrograms.
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10. A system for enhancing an input signal, the system comprising:
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means for transforming the acoustic input signal to a time-frequency representation;
means for determining a matching low noise signal template for the time-frequency representation; and
means for replacing a portion of the time-frequency representation with a signal-to-noise ratio weighted mix of the time-frequency representation and the matching low noise signal template. - View Dependent Claims (11, 12, 13)
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14. A signal enhancement system comprising:
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a processor;
memory coupled to the processor, the memory comprising instruction which cause the processor to;
establish a signal model comprising multiple low noise signal templates;
obtain an input signal;
determine a matching low noise signal template in the signal model for the input signal; and
replace a portion of the input signal with a signal-to-noise ratio weighted mix of the input signal and the matching low noise signal template. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A product comprising:
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a machine readable medium; and
instructions stored on the machine readable medium which cause a processor to;
determine a matching low noise signal template for a noisy input signal from a signal model comprising multiple low noise signal templates; and
replace a portion of the input signal with a signal-to-noise ratio weighted mix of the input signal and the matching low noise signal template. - View Dependent Claims (22, 23, 24, 25)
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Specification