×

Method and apparatus for reducing noise radiated from a complex vibrating surface

  • US 5,410,607 A
  • Filed: 09/24/1993
  • Issued: 04/25/1995
  • Est. Priority Date: 09/24/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. An apparatus for reducing noise radiated from a vibrating surface comprising:

  • a motion sensor to sense the mechanical movement of a vibrating surface, said vibrating surface developing a broadband noise field having multiple propagation modes in a fluid medium, said motion sensor being operative to convert movement of said vibrating surface into a motion signal;

    a controller having a substantially fixed transfer function, said controller being responsive to said motion signal and operative to produce an antinoise signal; and

    an output transducer responsive to said antinoise signal and operative to produce a broadband antinoise field having multiple propagation modes which is approximately the same amplitude and which is approximately 180°

    out-of-phase with said noise field, such that said antinoise field and said noise field combine to reduce noise in a quiet zone in said fluid medium without substantially affecting vibrations of said vibrating surface;

    wherein at least one of said controller and said output transducer are physically attached to said vibrating surface.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×