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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 …
TRACKING NOTCH FILTER History, Theory and Application
https://edge.flexradio.com/www/uploads/20200818184959/Tracking-Notch-Filter-TNF-White-Paper.pdf
TRACKING NOTCH FILTER™ CONCEPT The Tracking Notch Filter™ or TNF™ was designed to solve these three problems described above: 1. The notch needs to follow or track the RF frequency of the offending signal in order to keep it notched as the operator changes frequency 2.
Notch filter autotunes for audio applications - EDN
https://www.edn.com/notch-filter-autotunes-for-audio-applications/
Tracking notch filters find use in harmonic-distortion analyzers; they also can remove heterodyne noise from ham-radio systems. A conventional tracking switched-capacitor notch filter relies on a bandpass filter, a voltage-to-frequency converter, and a notch filter to track the incoming signal and remove undesired tones.
Tracking Notch Filter (TNF) - Mac Ham Radio Software
https://dogparksoftware.com/dogparkSDR_Help/dpsdr_tnf.html
Tracking Notch Filter (TNF) "Tracking Notch Filter Theory. With the notch filters found on most receivers, the notch removes an audio frequency after the AGC. When you hear a carrier in the middle of a sideband transmission, you can enable the notch and adjust it to remove the objectionable carrier. The weakness of this type of filter is apparent when the dial frequency is …
Tracking Notch Filter (TNF) - FlexRadio Community
https://community.flexradio.com/discussion/6560970/tracking-notch-filter-tnf
Tracking Notch Filter "tracks" the same place in the frequency spectrum, regardless of the position of the panadapter or the slice. Most notch filters (i.e. All the others) are locked to the audio spectrum of the receive bandwidth. Or they are automatic filters that will lock to a frequency within the receiver bandwidth.
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