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Active noise control in a duct with highly turbulent airflow

  • US 5,606,622 A
  • Filed: 09/29/1994
  • Issued: 02/25/1997
  • Est. Priority Date: 09/29/1994
  • Status: Expired due to Fees
First Claim
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1. In combination in an active noise cancellation system in a duct having an input microphone, a control speaker, and an error microphone;

  • a turbulent airflow control device disposed upstream in said duct from said input microphone;

    said input microphone and said error microphone having bullet shaped profiles;

    the combination wherein said turbulent airflow control device comprises a perforated plate wherein a honeycomb section is attached to said perforated plate.

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