(compMus1) More Analog Synthesis, LFO's and Filters

LFO (Low Frequency Oscillator): an oscillator that is optimized to generate sub-audio-rate waveforms, generally from 0 Hz to ~35 Hz (slightly above audio threshold). Used for modulating parameters of other generators or processors.

Filter:  Any device designed for the purpose of boosting and/or cutting frequencies within specified frequency ranges.

What to Know About Filters (for now)

  • Common filter types: low pass, high pass, bandpass, and band reject (notch)
  • Frequency responses typical for each type (what passes and what is rejected)
  • Associated terms: cutoff frequency, center frequency, pass band, stop band, slope, bandwidth (and from what points on freq response curve bandwidth is measured), and Q.


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