Mar 31, 2014 · The Decoder Circuit For this project, I chose the LM567 tone decoder IC. This part is a rather old design, but it works well, and they are still quite common with several manufacturers offering pin-compatible parts. I suspect the ongoing success of this part is that it implements an analog PLL circuit with the I & Q detectors and VCO built-in. MP3 codec IC, MP3 ic chip, audio decoder chip, audio mp3 decoder module manufacturers and suppliers, OEM/ODM and your special requests are welcome.
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The decoder is designed for code speeds ranging from about 6 words per minute (WPM) to greater than 36 WPM. The rate adaptive algorithm responds quickly to code speed changes, so you can copy both halves of a QSO, even when the parties transmit at different rates. The Hardware The schematic of the decoder is shown in figures 1a and 1b.