Unfortunately I don't know of any open source software to solve your needs. What SNR you need is ultimately determined by the decoder in CW Skimmer and the 'quality' and signalling speed of the received morse code. A shielded loop cable (made as short as possible) can be beneficial, but the noise from the A/D and D/A converters can only be remedied by use of a better (and likely more expensive) soundcard. Item number 2 above will not likely be a problem, unless you are listening to very weak morse signals. The D/A and A/D converters on the sound cards will add noise too. To use our morse code translator just enter your text or morse code in the input box and then see the translation in the output box. Our morse code translator tool makes it easy to convert standard text to morse code and convert morse code to plain text. The signal to noise ratio (SNR) will worsen slightly, since the analog connection outside of your computer will add noise. Morse Code Translator: Decode & Encode Morse Code.You will probably need a second soundcard. There are two drawbacks with this method though: Of course, as suggested above, you could also use a physical cable to loop the signal from the output of your soundcard back into the computer. This installs as a virtual audio card in your system, which should make it possible to redirect the output of your MP3 player to CW Skimmer. A free (as in beer) virtual audio cable driver is VB-Cable. If you are using Windows you could probably use the commercial CW Skimmer software in combination with a so called 'virtual audio cable'.
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