On Wednesday, 3 May 2023 19:20:10 EEST Marcus Müller wrote: > Hi George, > > that's a multiplicative voice scrambler! > > The pre-Second World war voice scrambler system "SIGSALY" [1] was kind > of similar; > just that the scrambling sequence came out of a noisy vacuum tube, not > Python's random.random(), and that the combination method was taking > samples and adding them modulo 6, instead of multiplying the phase > (which is inherently modulo 2π). >
That was a really nice description, thank you for taking the time to write that. The original project is also interesting, even if we call it differently. So to me this looks like a basic CDMA access scheme, is there really any advantage to using it as opposed to standard FDMA as traditionally used on QO100? From an amateur radio operator perspective. Adrian
