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3.8 Ideal filters

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Describes five ideal filters.

There are four fundamental filters. They are

  • Lowpass -- blocks high frequencies, allowing low frequencies through
  • Highpass -- blocks low frequencies, allowing high frequencies through
  • Bandpass -- blocks all frequencies except those within a certain range
  • Bandstop -- blocks only the frequencies within a certain range, allowing all others to pass through

Lowpass
Highpass
Bandpass
Bandstop
Ideal frequency domain representations of the four fundamental filters.

Another term one may come across in the study of filters is an "allpass" filter. This is one that allows all frequencies through. The onlymeaningful effect an allpass filter can have is on the phase of the signal.
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Source:  OpenStax, Ece 301 projects fall 2003. OpenStax CNX. Jan 22, 2004 Download for free at http://cnx.org/content/col10223/1.5
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