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K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
Home Brew CW Filter: If you are just getting into CW and you are starting off with an older radio or QRP set. Newer radios may come equipped with filters for narrowing the audio passband or digital signal processing (DSP) to clean up unwanted noise. But you may be faced with trying to pick out a wanted signal from a swamp of others.
The Ultimate Audio Filter
http://www.ac0c.com/main/page_homebrew_the_ultimate_audio_filter.html
And the second driver is the memory of the fun I had as a kid with active filters. DSP vs. Analog. An active audio filter is in many ways comparable to the digital variety without the complexity. It has the performance and flexibility advantages without the need for specialized DSP hardware or coding implementations.
K4ICY's Home Brew CW Audio Filter
http://k4icy.com/cwqrpp.htm
- I need ferrite beads! On the audio to the phones, to the LM386, the keying line and anywhere else that can cause problems. - A more robust filter for the antenna line. Basically a high-Q multi-pole band pass filter for 40m. - RIT! I want to try using the 2N7000s to switch a veri-cap in and out.
Filter The Mourning Dove Hoot Out Of The ... - Home Brew Audio
https://www.homebrewaudio.com/filter-mourning-dove-hoot-voiceover-recording/
Anyway, there are some audio editing tools that you can use to reduce (or even eliminate) one type of sound, while leaving the desired audio alone. One of the best of these tools is EQ (short for "equalization"). Graphic EQ in Audition. If the undesired audio has a much different frequency than the desired audio, then EQ can help filter out ...
Review Of The Pauly Ton Superscreen Pop Filter | Home Brew ...
https://www.homebrewaudio.com/17868/review-pauly-ton-superscreen-pop-filter/
Both pop filters reduced the p-pops by quite a lot. But neither one performed noticeably better than the other in this regard. The Pauly Ton is also supposed to result in better quality audio AFTER it reduces p-pops, as it supposedly allows the rest of the voice recording to come through, when cheaper filters do not.
The Magical Audio Filter - 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.
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