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Sound reproducing system with Hall effect motional feedback

  • US 4,821,328 A
  • Filed: 10/24/1986
  • Issued: 04/11/1989
  • Est. Priority Date: 10/24/1986
  • Status: Expired due to Fees
First Claim
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1. Means for sensing the motion of sound generating member of a sound reproducing system, wherein said means comprise:

  • at least one Hall generator, linked to and mechanically driven by said sound generating member;

    a reference magnet structure, comprising two magnets, wherein said magnets form single gap between their homonymous poles, and wherein spatial relation of said reference magnet structure to said Hall generator results in said Hall generator reciprocating along the axis connecting said homonymous poles of said reference magnet structure;

    a current source energizing said Hall generator; and

    an amplifier jointly responsive to an input signal and a feedback signal, derived from said Hall generator.

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