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.
KeywordsCutoff Frequency Notch Filter Frequency Filter Differential Amplifier True Curve
Unable to display preview. Download preview PDF.