Plot spectrogram

Creates a visualization of a spectrogram result.

Usage

plotSpectrogram(spec, freq_range = NULL, log_power = TRUE)

Arguments

spec

Spectrogram result from spectrogram().

freq_range

Optional frequency range to display.

log_power

If TRUE, displays log power (dB scale).

Value

A ggplot object showing the spectrogram as a filled raster plot with time on the x-axis and frequency on the y-axis.

References

Oppenheim, A.V. & Willsky, A.S. (1997). "Signals and Systems." 2nd ed. Prentice Hall.

See also

spectrogram() to compute the spectrogram data, plotPSD() for power spectral density plots, plotSignal() for time-domain visualization.

Examples

pe <- PhysioExperiment(
  assays = list(raw = matrix(rnorm(1000 * 4), nrow = 1000)),
  samplingRate = 250
)

# Compute spectrogram
spec <- spectrogram(pe, channel = 1)

# Plot with frequency range filter
plotSpectrogram(spec, freq_range = c(1, 50))