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BIO-FEEDBACK APPARATUS

  • US 3,821,949 A
  • Filed: 04/10/1972
  • Issued: 07/02/1974
  • Est. Priority Date: 04/10/1972
  • Status: Expired due to Term
First Claim
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1. A bio-feedback apparatus for sensing the brain-wave potentials produced by a subject and providing feedback signals in response thereto, the apparatus comprising:

  • a brain-wave indicator detecting and sensing brain-wave potentials, and providing an output signal responsive thereto;

    a preamplifier receiving the brain-wave indicator output signal and providing an amplified output signal responsive thereto;

    a plurality of processing channels, each processing channel receiving the preamplifier output signal and providing a feedback signal responsive thereto, each processing channel comprising;

    a passband filter, having a predetermined passband, receiving the preamplifier output signal and providing an output signal responsive to a frequency component of the received signal within the passband; and

    means receiving the passband filter output signal and providing an output signal indicative of signal presence in the processing channel, including;

    an oscillator, interposed in each processing channel, each oscillator in each processing channel receiving the passband filter output signal and generating an output signal having a distinct, separately identifiable frequency in response thereto, the oscillator output signals indicating signal presence in the processing channels;

    a feedback indicator receiving the output signals indicative of the signal presence from each of the processing channels and providing subject-perceivable feedback signals responsive thereto, the feedback indicator including;

    a summing amplifier receiving the oscillator output signal from each of the oscillators in each processing channel and providing a single output signal in response to the received oscillator output signals; and

    an output indicator receiving the summing amplifier output signal and providing a subject-perceivable output indication responsive thereto.

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