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US 2010/0303256 A1Published application
Noise cancellation system with signal-to-noise ratio dependent gain
OwnerRichard Clemowinventor
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Abstract
There is provided a noise cancellation system, comprising: a voice input, for receiving a wanted signal; a noise input for receiving a detected signal representative of ambient noise; a signal processor, for generating a noise cancellation signal for addition to the wanted signal, the signal processor having an adjustable gain; and control circuitry, for determining a relationship between levels of the wanted signal and the detected signal, and for controlling the adjustable gain on the basis of the determined relationship.
Claims24
A noise cancellation system, comprising:
- a voice input, for receiving a wanted signal;
- a noise input for receiving a detected signal representative of ambient noise;
- a signal processor, for generating a noise cancellation signal for addition to the wanted signal, the signal processor having an adjustable gain;
- and
- control circuitry, for determining a relationship between levels of the wanted signal and the detected signal, and for controlling a level of the adjustable gain on the basis of the determined relationship.
2 more elements
A method of controlling a noise cancellation system, comprising:
- receiving a wanted signal;
- receiving a detected signal representative of ambient noise;
- generating a noise cancellation signal for addition to the wanted signal, said generating comprising at least the substep of applying gain;
- determining a relationship between levels of the wanted signal and the detected signal;
- and
- adjusting a level of said gain on the basis of the determined relationship.
3 more elements
Dependencies are inferred from the claim text.