I added a bit-scrambler to the modulator to see what it would do. Haven't figured out how to add it to the demodulator yet though.
https://github.com/srsampson/codec2/blob/ss-scramble/src/mode6000.c#L118 https://github.com/srsampson/codec2/blob/ss-scramble/src/mode6000.c#L188 Here's the unscrambled spectrum: [image: unscrambled.png] ...and scrambled: [image: scrambled.png] ...and here's what it sounds like: https://github.com/srsampson/codec2/blob/ss-scramble/wav/scrambled.wav Just an idea! Steve
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