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The Ultimate Audio Filter
http://www.ac0c.com/main/page_homebrew_the_ultimate_audio_filter.html
There are two areas that the DSP is superior - in current rig implementations, the DSP filter is typically part of the AGC loop where a back-end AF only filter is not. In addition, the ringing performance of the DSP can be better than the analog variety at the expense of higher demands on DSP hardware.
A DSP-Based Audio Signal Processor
https://www.arrl.org/files/file/Technology/tis/info/pdf/9609x008.pdf
home-brew receiver project. The ASP consists of several components: a digital beat-frequency oscillator (BFO), selectable band-pass filters for CW, SSB and other digital modes, a denoiser based on the least-mean-squares (LMS) technique and a Wiener-filter autonotcher (removing carriers or heterodynes).
Combo DSP and Analog Audio Filter
https://ac0c.com/main/page_homebrew_combo_analogdsp_filter.html
The chain is DSP filter --> analog peak filter --> buffer amp --> speaker amp. The buffer amp really should not have been needed but it provided some isolation between outputs that was needed. Of the two filters the DSP has the lesser peak signal handling capability so it ended up in the chain first. ANALOG PEAK FILTER
Homebrew FT-818 CW audio filter (DSP) : amateurradio
https://www.reddit.com/r/amateurradio/comments/ledqfy/homebrew_ft818_cw_audio_filter_dsp/
It's amazing what a DSP audio bandpass filter and some binaural channelization can do for a filterless CW receiver! The FT-818's default config is the same bandwidth as SSB phone, which makes for a lot of unnecessary noise. I built it with a Teensy 4.0 microcontroller and the PJRC audio board, with a DSP chain described in the blog post above.
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.
DSP Audio Filters - newsvhf.com
http://newsvhf.com/dsp-rev.html
We also compared the DSP filters with one of the best analog audio filters, the Datong FL3. Our review concentrated on real-life use rather than paper specs or bench tests. DSP filters can do remarkable things with HF CW and SSB, but you can read all about that in the magazines. These notes are about how they work with weak CW.
The DSP Filter for the K2
http://www.qrpproject.de/UK/dsp_filter.htm
The DSP IC and related parts are pre-installed on a small plug-in module. The KDSP2 provides up to four user-configurable filters in each mode (CW/SSB/data), complementing the K2's variable-bandwidth crystal filter. CW filter settings include center frequency and bandwidth, with "hard" and "soft" filter algorithms and bandwidths as narrow as 50 Hz. SSB filters provide programmable …
Audio CW Filter - PARA
https://www.para.org.ph/docs/CW-Audio-Filter.pdf
design, I decided to build the audio cw filter from a kit. Before looking at audio cw filters my preference was to find a audio cw filter kit which had a fixed bandwidth, center frequency and gain. There are some audio cw filters which allow the varying of one or more of these parameters and some filters also have peak, notch and DSP.
Homebrewing for QRP SSB - Homebrew: N6QW QRP and QRO …
https://www.jessystems.com/Homebrewing%20for%20QRP%20SSB.pdf
pole filter you will need 5 coupling caps of the same value. Typically the smaller the caps the wider the filter bandwidth. At around 68-100 PF the filter will be good for SSB and 300 to 470 PF is best for CW. The input output impedance of the filter is in the range of 200 to 400 ohms. I usually assume 200 ohms as it is an easy 4:1 match to 50 Ohms.
Ham Supply LogiKit SCAF-1 – Bandpass Filter
https://www.hamsupply.com/logikit-scaf-1-noise-filter/
By turning the single front knob, you set the audio low pass filter cut off frequency anywhere you want it from 450 Hertz to 3.5 kHz. And that’s it. Every signal or noise above the frequency you set is rolled off at 96 dB per octave. And it is done at audio frequencies – no white noise!
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