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Tone control of the operational type

  • US 4,382,158 A
  • Filed: 09/11/1980
  • Issued: 05/03/1983
  • Est. Priority Date: 03/22/1980
  • Status: Expired due to Term
First Claim
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1. A tone control circuit for modifying an audio signal comprising:

  • an input terminal;

    an output terminal;

    means for directly passing said audio signal from said input terminal to said output terminal;

    modification means for modifying said audio signal to produce a boost or attenuation signal corresponding to at least a portion of the frequency spectrum of said audio signal;

    said means for directly passing said audio signal further including means for adding or subtracting said boost or attenuation signal to said audio signal, only when desired, to boost or attenuate the portion of said frequency spectrum selected by said modification means.

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