Spectra

Spectrum types mirror the time-series hierarchy: an AbstractSpectrum is the frequency-domain counterpart of a time series, with a frequency dimension (𝑓 or Log𝑓/Log10𝑓 for logarithmically spaced spectra) replacing time. Spectrograms (AbstractSpectrogram) carry both a time and a frequency dimension.

using TimeseriesTools, Random
Random.seed!(0)
x = Timeseries(randn(2000), 0.0:0.01:19.99)
S = powerspectrum(x, 0.1)        # see Spectra and spectrograms
S isa UnivariateSpectrum, dims(S)

(true, (↓ 𝑓 Sampled{Float64} 0.0:0.1:50.0 ForwardOrdered Regular Points))

Spectrum is the constructor for assembling a spectrum directly from values and a frequency lookup; in practice spectra are most often produced by powerspectrum/energyspectrum/waveletspectrogram.

Reference

TimeseriesBase.Spectra.AbstractSpectrum Type

AbstractSpectrum{T, N, B}

A type alias for an AbstractToolsArray in which the first dimension is 𝑓requency.

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TimeseriesBase.Spectra.RegularSpectrum Type

RegularSpectrum{T, N, B}

A type alias for a spectrum with a regularly sampled frequency index.

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TimeseriesBase.Spectra.UnivariateSpectrum Type

UnivariateSpectrum{T} = AbstractSpectrum{T, 1} where T

A type alias for a univariate spectrum.

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TimeseriesBase.Spectra.MultivariateSpectrum Type

MultivariateSpectrum{T} = AbstractSpectrum{T, 2} where T

A type alias for a multivariate spectrum.

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TimeseriesBase.Spectra.Spectrum Function

Spectrum(f, x)

Constructs a univariate spectrum with frequencies f and data x.

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Spectrum(f, v, x)

Constructs a multivariate spectrum with frequencies f, variables v, and data x.

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Missing docstring.

Missing docstring for freqs. Check Documenter's build log for details.

Missing docstring.

Missing docstring for AbstractSpectrogram. Check Documenter's build log for details.

Missing docstring.

Missing docstring for MultivariateSpectrogram. Check Documenter's build log for details.

Missing docstring.

Missing docstring for RegularSpectrogram. Check Documenter's build log for details.