It can work as narrow-band sound DSP-filter also. All the spacing was locked to ideal morse code at the speed it averaged from receive. Download Now Developers Description By DXsoft Program to decode Morse code (CW) via sound card to text. It took what it got timing wise from the sender and used that to transmit back. The program would do a guess to supply a missing dot or dash to generate a character based on what it heard and looking up valid Morse code characters. Those who used iambic keyers, vibroplexes and such it would do real well in getting a proper decode. It even calculated the approximate speed in WPM and displayed it. The chip works spot-on as long as you use good components to resist PLL-lock VCO drifting. I have experience with the LM567 Tone Decoder IC when I played around with making a Zero-Beat Indicator for CW. I used a subroutine that checked once a second to see when the characters were actually arriving and the length of dots, dashes and spaces the operator was sending adjusting the sample timing to fit. The first requirement of a CW decoder is to convert the audio containing the Morse code to a logic-level signal on or off. It started out at 8 WPM using the weights suggested for sending proper CW. Click to expand.Way back in the dark ages of 8bit I wrote a 6502 machine language cw decoder program on the Atari.
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