Spectral Methods for Finding Clicks
Wave Corrector provides two methods to manually find clicks using spectral analysis of the wave. Musical forms tend to consist of discrete frequency peaks usually with a harmonic relationship; ie the peaks tend to be evenly spaced across the frequency range. Noise, on the other hand, has no coherent structure and all frequencies tend to be present in approximately equal amounts. These characteristics can help you recognise a noise event when it is not obvious from the waveform display in the main window.
Wave Corrector provides a simple spectrum view and the more informative spectrogram view.
The Spectrum view shows the frequency spectrum at a single point in the file. In Spectrum view, the x-axis represents frequency and the y-axis represents amplitude. Separate traces are shown for the left and right channels. In the following illustration, a spectrum is shown where a click is present on the right channel (red) and not on left channel (green).
In Spectrogram view an entire sequence from the wave is shown in a single image. In this view, the x-axis represents time, the y-axis represents frequency, and the colour of a point represents its amplitude. In Spectrogram view, a click is usually visible as a vertical bar of a single colour.
The Spectrum and Spectrogram views are displayed in the bottom 'Overview' window when they are selected. Use the View Overview command to revert to the normal Overview display.