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Active noise control using bass management

  • US 8,559,648 B2
  • Filed: 09/29/2008
  • Issued: 10/15/2013
  • Est. Priority Date: 09/27/2007
  • Status: Active Grant
First Claim
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1. An active noise cancellation system for reducing, at a listening position, the power of a noise signal being radiated from a noise source to the listening position, the system comprising:

  • an adaptive filter that receives a reference signal representing the noise signal, and provides a compensation signal;

    a bass management unit comprising an all-pass filter that receives the compensation signal and applies a variable phase shift as a function of frequency to the compensation signal to provide a phase shifted compensation signal;

    a first acoustic radiator that receives the phase shifted compensation signal and radiates audio indicative thereof to the listening position; and

    a second acoustic radiator that receives the compensation signal and radiates audio indicative thereof to the listening position;

    where transfer function characteristics from the input of the bass management system to the listening position approximately matches a desired transfer function.

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