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update chirp spectrum #192

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Merged
baggepinnen merged 1 commit into from
Jan 17, 2026
Merged

update chirp spectrum #192

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9 changes: 7 additions & 2 deletions src/input_signals.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -126,16 +126,21 @@ function chirp(N::Int; Ts::Real, f0::Real, f1::Real, logspace::Bool=true)
end

t = range(0, step=Ts, length=N)
T = t[end] - t[1]

f0 > 0 && f1 > 0 || throw(ArgumentError("f0 and f1 must be positive frequencies"))

if logspace
f = exp10.(LinRange(log10(f0), log10(f1), N))
f = f0 .* (f1/f0) .^ (t ./ T)
phase = (2π * T / log(f1/f0)) .* (f .- f0)
else
f = LinRange(f0, f1, N)
k = (f1 - f0) / T
phase = 2π .* (f0 .* t .+ (k/2) .* t.^2)
end

q = @. sin(2π * f * t)
q = sin.(phase)

return q
end

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