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One Dimensional Two Dimensional Time Domain Frequency Domain Audio Waveform Display One Dimensional Fourier Spectrum Raster Image Display Two Dimensional Fourier Spectrum Figure 3.1: Plot Layout for User Interface The GUI for the main window is displayed in figure 3.2. Below the four data plots there are several controls. On the right-hand side there are two panels containing the audio player (section 3.7) and the 2D spectrum display controls (section 4.4). On the left of the audio player are the frame selection buttons that allow the user to select which frame of data is displayed in the plots. The ‘Processing’ button opens the processing pop-up window that provides access to 2D Fourier signal processing; this is described in chapter 5. The ‘Info’ button opens a pop-up window that displays several signal properties and the ‘Reanalyse’ button opens a pop-up window that allows the user to adjust the initial analysis settings and redisplay the signal, these features are described in chapter 4. The main window also has a custom menu and toolbar, which provides access to data I/O, settings and analysis tools; the implementation is described in section 3.5. 37