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US 7,010,118 B2Granted
Noise compensation methods and systems for increasing the clarity of voice communications
AssigneeAgere Systems Inc.
InventorWalter Etter
Life of this patent
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Abstract
The amount of noise compensation applied to a signal is controlled by a system operating as both a noise-adaptive expander and compressor based on far-end and near-end noise level estimates.
Claims29
A system for noise compensation comprising:
- a near-end noise level estimator receiving a near-end signal and generating a near-end noise level estimate based on the near-end signal;
- and
- a first noise adaptive compander comprising:
- a first input for receiving a far-end signal;
- a second input for receiving the near-end noise level estimate;
- a first output for producing a near-end noise compensated output signal;
- and
- a noise adaptive gain controller for generating a noise adaptive gain GN that is a function of the near-end noise level estimate and a noise sensitivity coefficient, the noise sensitivity coefficient is set to a variable value to account for variability in the near-end noise level estimate resulting from imprecise measurement of the near-end noise, whereby the first noise adaptive compander receiving the far-end signal at the first input and receiving the near-end noise level estimate at the second input, the first noise-adaptive compander operating to adjustably amplify the far-end signal based upon the noise adaptive gain GN to produce the near-end noise compensated output signal at the first output.
5 more elements
A method of compensating for noise comprising:
- receiving a near-end noise level estimate of a near-end signal in a compander,
- receiving a far-end signal in the compander, the far-end signal to be adaptively amplified to compensate for noise;
- setting a noise sensitivity coefficient to a variable amount to account for the near-end noise level estimate having an imprecise representation of the near-end noise;
- generating a noise adaptive gain in a noise adaptive gain controller, the noise adaptive gain a function of the near-end noise level estimate and the noise sensitivity coefficient;
- amplifying the far-end signal based on the near-end noise level estimate and the noise sensitivity coefficient.
2 more elements
A system for noise compensation comprising:
- a near-end noise level estimator receiving a near-end signal and generating a near-end noise level estimate based on the near-end signal;
- and
- a first noise adaptive compander comprising:
- a first input for receiving a far-end signal;
- a second input for receiving the near-end noise level estimate;
- a first output for producing an output signal;
- and
- a noise adaptive gain controller for generating a noise adaptive gain GN that is a function of the near-end noise level estimate and a noise sensitivity coefficient, the noise sensitivity coefficient is set to a variable value to account for variability in the near-end noise level estimate resulting from imprecise measurement of the near-end noise, the first noise adaptive compander receiving the far-end signal at the first input and receiving the near-end noise level estimate at the second input, the first noise-adaptive compander operating to apply the noise adaptive gain GN to the far-end signal to compensate the output signal at the first output for near end noise.
5 more elements
Dependencies are inferred from the claim text.