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The Magica Audio Fil - N5DUX homepage
http://www.n5dux.com/ham/files/pdf/The%20Magical%20Audio%20Filter.pdf
The Magica Audio Fil A variable-frequency notch filter plus a peaking circuit will do wonders for your reception. And this project will almost build itself. A udio filtering is a well- known process for improving receiver selectiv- ity and many articles have FO = I 27 ~4fi ALL RESISTORS 0 I% Fig. 1. Original circuit. been written on the subject.
Notch Filter - Hack Audio
https://www.hackaudio.com/digital-signal-processing/basic-filter-effects/notch-filter/
A notch filter decreases the amplitude of frequencies in the mid-range of the spectrum. It allows the low frequencies and the high frequencies to pass through. Audio engineers use this type of filter to cut out a problematic frequency. A notch filter can be implemented by modifying the low-pass filter effect. Instead of using one sample of delay on …
Notch Filter Circuits with Design Details - Homemade ...
https://www.homemade-circuits.com/designing-notch-filter-circuits/
The collection of waveforms to the left and right of the center frequency (100.731 kHz) corresponds to filter reactions, once the 1-kΩ potentiometer is positioned and tweaked in 1% increments. Every time the potentiometer is tuned halfway, the notch filter rejects frequencies at the precise core frequency.
State Variable Filters
https://sound-au.com/articles/state-variable.htm
As noted above, the state-variable filter makes an excellent notch filter by summing the high and low pass outputs. It is easily tuned, and the Q is adjustable so the width of the notch can be varied. Notch filters are used to remove single frequency tones (such as 50/60Hz hum) from an audio signal, or for distortion measurements.
Variable notch filter | Microchip
https://www.microchip.com/forums/m148212.aspx
If a notch filter is placed at the howling frequency the loop gain is reduced to < 1 and the howling stops. However if the Microphone is moved or the room dynamics change drastically, howling can occur at a different frequency, which requires a different notch.
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