Sound to Picture: Morph VFX

A task during the Creative Sound Design module to create abstract/morphing sound for the said morphing visual using FFT approach. As sound designers it is important that we understand these to the extent that we are aware of the strengths and weaknesses of this scheme for working with sound so that we know where best to apply it, and how to cope with artefacts. Here I have used a recorded sample of a metallic hit, and rings. By stretching it way out, FFT transforms time-domain sample data into complex-valued phase+amplitude components with equally spaced frequency. FFT The Fourier Transform (fast or otherwise) derives from a theory that any waveform can be described as a sum of cosine and sine waves (they are identical, but have a 90° phase difference) of various frequencies and amplitudes. This is only strictly true if the waveform in question is both perfectly periodic and infinite, neither of which are conditions likely to be met for sound. However, it turns out to be true enough to be useful

Published by Sarah Sherlock

Irish sound designer and composer. Audio Design for games, film, branding & more.