• Frank H. Duffy
  • Vasudeva G. Iyer
  • Walter W. Surwillo


If the amplifier is the heart of the EEG machine, then the filters could rightly be referred to as the brain. The filters are the selective devices that screen out unwanted signals and determine which features of the EEG will appear in the tracing. As we already mentioned in Chapter 1, there are three different types of filters on modern EEG machines: low-frequency filters, high-frequency filters, and 60-Hz “notch” filters. All three types operate according to the same basic principles. We will consider the principles of operation first before going into the details of how they actually function.


Cutoff Frequency Notch Filter Frequency Filter Differential Amplifier True Curve 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag New York Inc. 1989

Authors and Affiliations

  • Frank H. Duffy
    • 1
    • 2
  • Vasudeva G. Iyer
    • 3
  • Walter W. Surwillo
    • 4
  1. 1.Harvard Medical SchoolBostonUSA
  2. 2.The Children’s HospitalBostonUSA
  3. 3.University of Louisville School of MedicineLouisvilleUSA
  4. 4.Department of Psychiatry and Behavioral SciencesUniversity of Louisville School of MedicineLouisvilleUSA

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