Techniques for Comfort Noise Generation in a Communication System
AssigneeFreescale Semiconductor, Inc.
InventorsRoman A. Dyba, Perry P. He, Brad L. Zwernemann
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Abstract
A technique of operating a communication device includes dividing a frequency band associated with a background noise signal into respective sub-bands. Respective individual level estimates for each of the respective sub-bands are then determined. A total level estimate for the background noise signal is determined. Finally, a comfort noise signal (whose characteristics are based on the respective individual level estimates and the total level estimate) is provided.
Claims20
A method of operating a communication device, comprising:
- determining respective individual level estimates for respective sub-bands included in a frequency band associated with a background noise signal;
- determining a total level estimate for the background noise signal;
- and
- providing a comfort noise signal whose characteristics are based on the respective individual level estimates and the total level estimate.
A communication device, comprising:
- an analysis task block configured to:
- divide a frequency band associated with a background noise signal into respective sub-bands;
- determine respective individual level estimates for each of the respective sub-bands;
- and
- determine a total level estimate for the background noise signal;
- and
- a synthesis task block in communication with the analysis task block, wherein the synthesis task block is configured to provide a comfort noise signal whose characteristics are based on the respective individual level estimates and the total level estimate.
A method of operating a communication device, comprising:
- filtering a background noise signal to derive sub-band level estimates for respective sub-bands included in a frequency band associated with the background noise signal;
- integrating the respective sub-band level estimates to derive respective individual level estimates;
- integrating the background noise signal to derive a total level estimate;
- and
- providing a comfort noise signal whose characteristics are based on the respective individual level estimates and the total level estimate.
Dependencies are inferred from the claim text.