Voltage controlled filter: Difference between revisions

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A '''voltage-controlled filter''' '''(VCF)''' is an [[filter|electronic filter]] whose operating characteristic can be set by a [[CV/gate|control voltage]].<ref>''[https://books.google.co.uk/books?id=3hjvWzkMK-sC&pg=PA27#v=onepage&q=filter&f=false Analog Days: The Invention and Impact of the Moog Synthesizer]'' by Trevor Pinch and Frank Trocco, Harvard University Press, 2004, ISBN 0674016173</ref>
An audio filter is a frequency dependent amplifier circuit, working in the audio frequency range, 0 Hz to beyond 20 kHz. Audio filters can amplify (boost), pass or attenuate (cut) some frequency ranges.


Common filter types used in audio synthesis include:
Common filter types used in audio synthesis include:

* Low-pass (high-cut) filter: removes higher frequencies
* Low-pass (high-cut) filter: removes higher frequencies
* High-pass (low-cut) filter: removes lower frequencies
* High-pass (low-cut) filter: removes lower frequencies
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There are many ways to implement most filters, and each has its own specific audio characteristics or flavour. Some common features across most filter types include:
There are many ways to implement most filters, and each has its own specific audio characteristics or flavour. Some common features across most filter types include:
⚫
* A cut-off frequency - the frequency at which the filter begins to remove frequencies. This is often voltage-controllable and can changes over time (e.g. controlled by an [[Envelope generator|envelope]], or an [[Low frequency oscillator|LFO]]).

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* Resonance - how much the filter boosts the frequency at the cut-off point. This may also be voltage-controllable.
⚫
* A cut-off frequency - the frequency at which the filter begins to remove frequencies. This is often [[voltage control|voltage-controllable]], and can changes over time (e.g. controlled by an [[Envelope generator|envelope]], or an [[Low frequency oscillator|LFO]]).
⚫
* Phase shift - frequencies beyond the cut-off often have their [[phase]] affected.
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* resonance - how much the filter boosts the frequency at the cut-off point. This may also be voltage-controllable.
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* frequencies beyond the cut-off often have their [[phase]] affected.


== References ==
== References ==
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