Fan and compressor noise attenuation

Electrical audio signal processing systems and devices – Binaural and stereophonic – Pseudo stereophonic

Reexamination Certificate

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Details

C381S071100, C181S204000, C415S119000

Reexamination Certificate

active

06973193

ABSTRACT:
An exciting sound wave generator is positioned within a nacelle of a jet engine at its inlet to generate an exciting sound wave having a primary frequency generally different from a frequency of the primary tone of the noise. The exciting sound wave is used to modulate the primary tone of the noise and, therefore, distribute sound energy of the noise from the primary tone to a broad range of side bands so that the amplitude of the primary tone of the noise is reduced.

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