User:Rob Kam/sandbox1/Filter
Redirects to Electronic filter, with contents: The action of a filter depends on the frequency dependent opposition to current flow, called impedance. Simple formula relating capacitance, inductance, resistance and frequency. Capacitive impedance goes down with frequency and inductive impedance goes up with frequency. Resistance doesn't matter. From formula we can derive mathematical models for how any combination of capacitors, inductors, (actually these are avoided in audio because they are so big), resistors and amplifiers behave.[1]
- Basic linear design, Analog Devices, 2008, Chapter 8, Analog Filters
An electronic topology is https://en.wikipedia.org/wiki/Topology_(electrical_circuits)
See Voltage controlled filter for synthesizer filters.
A filter reduces or removes certain frequencies and harmonics from the sound that is passed through it. In a synthesizer, the most typical filter types are:
- low pass (passes all of the harmonics below its cutoff or corner frequency untouched, and then reduces the level of higher harmonics the further you go above that cutoff frequency)
- high pass (passes all harmonics above its cutoff frequency untouched, and reduces the level of progressively lower harmonics below the cutoff)
- bandpass (harmonics right around the cutoff are passed intact, and then reduced more in level the further away they are above or below the cutoff frequency)
- notch (harmonics right around the cutoff frequency are reduced or cut out entirely; others above or below are allowed to live).[2]
See also
- Voltage controlled filter for synthesizer filters
References
- ^ Post by by Pelsea to types of filters (based on circuitry), Mod Wiggler Forum, 19 Mar 2019
- ^ Filter, Learning Modular
Further reading
- Variable audio filters - Part 1, Audio out by Jake Rothman, EPE, April 2018, pp. 56-60 Variable audio filters - Part 2: voltage-controlled filters, Audio out by Jake Rothman, EPE, May 2018, pp. 57-61
- Linear Circuit Design Handbook, edited by Hank Zumbahlen, Newnes/Elsevier, 2008, ISBN 9780750687034 also published as Basic Linear Design, Analog Devices, 2007, ISBN 0916550281, Chapter 8, Analog Filters
External links
- Active Filters - Characteristics, Topologies and Examples by Rod Elliott (ESP)
- * Electronic Music Circuit Design: 2nd Order Butterworth Filters by Thomas Henry, Electronic Music Circuits: The Reprints, Vol 1, pp. 18-20
- How to design analog filter circuits, Mannie Horowitz, Radio Electronics, Dec 1983
- Electronic filter, Wikipedia
- Electronic filter topology, Wikipedia
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