I'm experimenting with this technology.
I am attempting to assess if anyone would be interested in my experience constructing an Arduino-based DSP Noise Reduction implementation by Graham Whaley.
One can read about his wonderful DSPHam device here:
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It's quite feature packed and provides the user with:
- Several digital filters with differing bandwidth for FM, AM, SSB, CW which can be customized
- Two different AGC algorithms
- Noise Blanker and Notch Filter
- Selectable Noise Reduction Algorithms: Least Mean Squared (LMS), Spectral Subtraction, Two types of Moving Average, and Leaky LMS
- Three algorithms for decoding CW
Approximate parts summary and cost:
$36 Teensy 4.1 ARM Cortex-M7 Processor
$15 Teensy 4.0/4.1 Audio Adpater Shield
$ 4? Two-Line x 16 character backlit LCD (I originally used an RGB LCD, but then modified the code to use a cheaper mono-chromatic LCD)
$ 2? Rotary Encoder
Some additional miscellaneous parts, for 5V power-supply, wire, filter, mono-audio plugs, etc.
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Note: I have not put it in an enclosure yet. But one can see from the list above, adding DSP capability to an older radio can be done for a very reasonable amount.
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Please let me know if you are interested.
73 W7STF Sam
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