Amplitude Manipulation for Perceived Movement in Depth
The presentation of objects moving in depth towards the viewer (looming) is a technique used in film (particularly those in 3D) to assist in drawing the viewer into the created world. The sounds that accompany these looming objects can affect the extent to which a viewer can perceptually immerse within the multidimensional world and interact with moving objects. However the extent to which sound parameters should be manipulated remains unclear. For example, amplitude, spectral components, reverb and spatialisation can all be altered, but the degree of their alteration and the resulting perception generated, need greater investigation. This paper presents the results from an investigation into one of the sound parameters used as an audio cue in looming scenes by the film industry, namely amplitude, reporting the degree and slope of its manipulation.
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