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US 8,559,619 B2Granted
Methods and devices for reducing sidetone noise levels
AssigneeAlcatel Lucent
InventorWalter Etter
Life of this patent
Estimating the term…
Abstract
The sidetone noise level in a wireless or wired telephone, for example, is reduced by adjusting both noise and signal levels and/or by improving the signal-to-noise ratio of such signals.
Claims26
A device for at least reducing sidetone noise levels comprising:
- a noise estimation unit adapted to estimate a noise level of a near-end signal that includes both voice and background signals;
- a sidetone gain computation unit adapted to generate an adjustment factor based on the estimate;
- a sidetone gain control unit adapted to generate a sidetone signal consisting of adjusted noise and signal levels of the near end signal using the generated adjustment factor;
- and
- a sidetone mixer adapted to output the adjusted, sidetone signal to the near-end.
2 more elements
A device for at least reducing sidetone noise levels comprising:
- one or more noise reduction units adapted to reduce the noise level of a near-end signal;
- a sidetone gain control unit adapted to generate a signal consisting of a sidetone signal of the near-end signal having an improved SNR;
- and
- a sidetone mixer adapted to output the sidetone signal to the near-end.
1 more element
A method for at least reducing sidetone noise levels comprising:
- estimating a noise level of a near-end signal that includes both voice and background signals;
- generating an adjustment factor based on the estimate;
- generating a sidetone signal consisting of adjusted noise and signal levels of the near-end signal using the generated adjustment factor;
- and
- further outputting the adjusted, sidetone signal to the near-end.
2 more elements
A method for at least reducing sidetone noise levels comprising:
- reducing the noise level of a near-end signal that includes both voice and background signals;
- generating a signal consisting of a sidetone signal of the near-end signal having an improved SNR;
- and
- further outputting the sidetone signal to the near-end.
1 more element
Dependencies are inferred from the claim text.