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Adaptive noise reduction technique for multi-point communication system

  • US 6,175,634 B1
  • Filed: 12/17/1996
  • Issued: 01/16/2001
  • Est. Priority Date: 08/28/1995
  • Status: Expired due to Term
First Claim
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1. A method of suppressing noise in an input signal, the method comprising:

  • repeatedly locating a noise level based on the input signal;

    selecting an attenuation function from a plurality of selectable attenuation functions based on the input signal and a current state of the noise level, wherein a first one of the selectable attenuation functions specifies a minimum level for an output signal if the input signal corresponds to a first range, and a second one of the selectable attenuation functions specifies a range of levels for the output signal greater than the minimum level if the input signal corresponds to a second range higher than the first range; and

    applying the selected attenuation function to the signal.

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