Distance-based automatic gain control and proximity-effect compensation
AssigneeAlcatel-Lucent USA Inc.
InventorWalter Etter
Life of this patent
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Abstract
An automatic gain control derives the gain from the distance between the sound source and the microphone. The distance-based automatic gain control normalizes signal level changes caused by a speaker not maintaining a constant distance with respect to the microphone. Also, a proximity-effect compensation that derives the adaptive filter from the distance between the sound source and the microphone. The proximity-effect compensation corrects frequency response changes due to undesired proximity-effect variations. Determination of the distance between a sound source and a microphone permits accurate compensation for both frequency response changes and distance-related signal level changes.
Claims20
An automatic gain control system for use with a sound source and a microphone, comprising:
- a gain controller configured to receive an input audio signal and configured to generate an output audio signal;
- wherein the gain controller is configured to control a level of the output audio signal based on a distance between the sound source and the microphone.
A frequency control system for use with a sound source and a microphone, comprising:
- a frequency response controller configured to receive an input audio signal and configured to generate an output audio signal;
- wherein the frequency response controller is configured to control the frequency spectrum of the output audio signal based on a distance between the sound source and the microphone.
An audio signal processing system for use with a sound source and a microphone, comprising:
- a frequency response controller configured to receive an input audio signal and configured to generate an output audio signal, wherein the frequency response controller is configured to control the frequency spectrum of the output audio signal based on a distance between the sound source and the microphone;
- and
- a gain controller configured to control the level of the output audio signal based on the distance between the sound source and the microphone.
Dependencies are inferred from the claim text.