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SYSTEMS AND METHODS FOR RECURSIVE NORM CALCULATION

  • US 20200135165A1
  • Filed: 10/31/2018
  • Published: 04/30/2020
  • Est. Priority Date: 10/31/2018
  • Status: Active Grant
First Claim
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1. A noise-cancellation method, comprising the steps of:

  • receiving a value from a noise sensor at a time step;

    storing the received value in a buffer, the buffer having a length, the buffer further storing a number of additional values, wherein an end value is removed from the buffer to accommodate the received value;

    providing a previously-computed result, wherein the previously-computed result represents the sum of the square of the values stored in the buffer at a previous time step;

    performing one of;

    (i) adding a square of the received value to the previously-computed result and subtracting a square of the end value from the sum of the received value and the previously computed value in order to yield a newly-computed result;

    or(ii) subtracting a square of the end value from the previously-computed result and adding a square of the received value to the result of subtracting the square of the end value from the previously computed result in order to yield a newly-computed result; and

    updating a plurality of coefficients of an adaptive filter according to, in part, the value of the newly-computed result;

    generating with the adaptive filter a noise-cancelling signal using the updated plurality of coefficients; and

    providing the noise-cancellation signal to an actuator for transduction of a noise-cancellation audio signal based on the noise-cancellation signal, the noise-cancellation audio signal destructively interfering with an undesired noise signal in a noise-cancellation zone.

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