It has been reported that the application of broadband noise cancelling techniques to the control of aircraft cockpit noise pickup is only successful at low frequencies. This effect is explained in terms of measures of the noise transmission across a standard British oxygen mask and a discussion of the spatial characteristics of the cockpit's acoustic field. A theoretical prediction of the maximum noise reduction given by a single channel noise cancelling system controlling a group of independantly excited noise transmission paths is presented.
TNT R000CTIONThe sound pressure levels experienced in contemporary fighter aircraft are typically >90 dBSPL over the entire speech frequency band, with noise levels increasing dramatically in the low level high speed flight envelopes required in tactical operations.These cockpit noises can cause severe operational problems if they are detected either by the microphone at the front end of' the communication system or by the pilot's ear.
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