Acoustic Visualisation
About
Author
1
Introduction
1.1
Predominance of the visual
1.2
Basic acoustic concepts
1.3
Types of files
1.3.1
Uncompressed waveform files
1.3.2
Lossy compression
1.3.3
zero-crossing
2
History
2.1
Goals of visualisation
2.2
Descriptive acoustics
2.2.1
Phonemes and onomatopoeia
2.2.2
Musical notation
2.3
Analytic acoustics
2.3.1
The ‘big-three’
2.3.2
The Fourier Transform
3
Early visualisations - the analogue years
3.1
CRTs
3.2
Print outs
4
Static digital images
4.1
The time domain
4.1.1
Oscillograms
4.2
The frequency domain
4.2.1
Plotting a spectrum
4.2.2
Plotting a spectrogram
5
Dynamic digital visualisations
5.1
Video spectrograms
5.2
zcjs: Zero-crossing File Visualisation
5.2.1
Customising a zcjs plot
6
Representing Soundscapes
6.1
False Colour Index Spectrograms
7
Patterns of activity
7.1
Daily Cycles
7.1.1
The Types of Twilight
7.1.2
Diel Plots
7.2
Yearly Cycles
7.3
Lunar Cycles
7.4
Core and ring plots
7.5
Behind the scenes
7.5.1
radialPolygon()
7.6
Empty plots
7.6.1
emptyDiel()
7.6.2
emptyYearly()
7.7
Adding data to the visualisation
7.7.1
Periodic data: rings
7.7.2
Periodic data: horizons
7.7.3
Helper functions
7.8
Interactive Plots
8
Displaying annotations
9
Shiny: Interactive Web Apps
10
The Future
11
Acknowledgements
References
Published with bookdown
Visualisation for bioacoustics and ecoacoustics in R
Chapter 6
Representing Soundscapes
6.1
False Colour Index Spectrograms