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Method of operating a single loud speaker drive system

  • US 5,917,922 A
  • Filed: 01/17/1997
  • Issued: 06/29/1999
  • Est. Priority Date: 11/08/1995
  • Status: Expired due to Fees
First Claim
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1. A method of operating a single speaker driver circuit for use in association with a source of audio signals and a single coil driven speaker for communicating said signals to said speaker and for reducing unwanted noise in said speaker, said driver circuit having, a low frequency input coil connected between the output of said audio circuit and the input of said single speaker, a low frequency return coil, connected between the return of said single speaker and the return of the audio signal, said low frequency return coil being bifilar wound with said low frequency input coil, whereby signals passing through said low frequency input coil, and through said speaker coil and then through said low frequency return coil will substantially reduce unwanted noise in said speaker, a higher frequency input coil connected between said output of said audio circuit and a location between the return of the speaker and the input to the low frequency return coil, and, a secondary coil connected between the input of said speaker, and said return of said audio signal, said higher frequency input coil and said secondary coil being bifilar wound with one another, and said secondary coil acting as the secondary of a transformer, and being adapted to be excited by higher frequency signals passing through said higher frequency input coil to induce secondary signals which are passed to said speaker input, and comprising the steps of:

  • passing said low frequency signals through said low frequency input coil;

    passing said high frequency signals through said high frequency input coil, and thereby inducing secondary signals in said secondary coil;

    combining said low frequency signals and said secondary signals and passing them through said speaker coil, and,passing said signals from said speaker coil through said low frequency coil bifilar wound with said input coil thereby suppressing unwanted noise signals in said low and high frequency signals.

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