X/GTK+ application for decoding Morse code signals into text. xdemorse detects the "dihs" and "dahs" that make a Morse code character via the computer's sound card, which can be connected to a radio receiver tuned to a CW Morse code transmission or to a tone generator.
The input signal is processed by a Goertzel tone detector algorithm which produces "mark" or "space" (signal/no signal) outputs and the resulting stream of Morse code "elements" is decoded into an ASCII character for printing to the Text viewer.
xdemorse has a certain level of tolerance towards operator errors (bad "fist") regarding deviation from the standard duration of the various elements that make up the Morse code.There is a "Waterfall" (audio spectrum) display derived from an integer-arithmetic FFT of the receiver's audio output.
This program has built-in CAT capability but only for the Yaesu FT847 or FT857 and Elecraft K2 or K3.