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How does audio peak filtering (APF) work? - KB6NU's Ham ...
https://www.kb6nu.com/how-does-audio-peak-filtering-apf-work/
The FT DX 1200 web page says: In the CW mode, the APF (Audio Peak Filter) function has an audio peak at the signal frequency; this improves the S/N and increases the readability of the CW signal. The APF peak frequency can be finely aligned. It works so well that I always have it on when operating CW. I want more details on how it works, though.
Peaking Filter Node - AudioNodes
https://www.audionodes.com/docs/peaking-filter-node/
Standard peaking filter Node, frequencies inside a specific frequency range get a boost or an attenuation, and frequencies outside it are unchanged. In other words, this Node can be used to increase or decrease the gain (or volume) only for a specific range of frequencies (e.g. to lower the volume around 1 kHz). Inputs Audio The Audio line to which the filter is applied. …
What is an audio peak filter? - Quora
https://www.quora.com/What-is-an-audio-peak-filter
Answer (1 of 2): A peaking filter for an audio graphic equalizer provides gain or loss (attenuation) at a specific center frequency . A peaking filter has unity frequency response magnitude, or 0 dB gain, at frequencies far removed from the center frequency. Plz upvote answer
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