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Noise suppression device, system, and method

  • US 9,190,071 B2
  • Filed: 09/14/2012
  • Issued: 11/17/2015
  • Est. Priority Date: 09/14/2012
  • Status: Active Grant
First Claim
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1. A noise-suppression assembly of a mechanical drive system having a rotational frequency, the mechanical drive system including a rotor of a helicopter, the assembly comprising:

  • an audio filter unit configured to receive a first audio signal and a timing signal of the mechanical drive system, the audio filter unit configured to generate a noise-cancellation signal based on a frequency of the timing signal, said frequency based on the rotational frequency of the rotor, to suppress a noise generated by the mechanical drive system and to apply the noise-cancellation signal to the first audio signal to produce a filtered first audio signal, the frequency based on a signal obtained from at least one sensor located on the rotor, wherein the sensor is a proximity sensor configured to detect the position of the rotor relative to a fixed position.

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