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and to give it a certain frequency content, you could filter the random signal before taking the sign. Another useful signal is a chirp, which can be generated using
""" chirp(Ts, f0, f1, Tf; logspace = true)A [chrip signal](https://en.wikipedia.org/wiki/Chirp) between frequencies (Hz) `f0` and `f1` with sample time `Ts` and duration `Tf` (seconds). `logspace` determines if the frequency change is logarithmic or linear. For experiments, it makes sense to use `logspace=true` to get a similar number of periods of excitation for all frequencies. A chirp with logarithmically spaced frequencies is also called an exponential chirp, or geometric chirp."""functionchirp(Ts, f0, f1, Tf; logspace=true)
t =range(0, step=Ts, stop=Tf)
N =length(t)
f = logspace ?exp10.(LinRange(log10(f0), log10(f1), N)) :LinRange(f0, f1, N)
q =@.sin(2π*f*t)
reshape(q, :, 1)
end
It would be useful to have some functionality similar to Matlab's idinput for generating some standard input signals such as PRBS.
I have only found some PRBS generator withing some telecom package.
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