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RECEIVER FOR INDUCTIVE COMMUNICATION SYSTEM

  • US 3,809,825 A
  • Filed: 04/26/1972
  • Issued: 05/07/1974
  • Est. Priority Date: 07/23/1969
  • Status: Expired due to Term
First Claim
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1. In an induction communicatiOn system, apparatus for detecting signals in a dynamic magnetic field, comprising a coil, a high permeability core, said core including a thin flat member of a high mu metal and having a width substantially equal to an inside dimension of said coil, a utilization device, said utilization device includes a low level amplifier and a speaker, said speaker being relatively insensitive to said dynamic magnetic field, said coil comprises a plurality of winding layers and wherein the coil end on the inside layer closest to said core is connected to the signal input terminal of said amplifier and the coil end on the outside winding layer is connected to the ground terminal of said amplifier.

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