The High Frequency Content measure is a simple measure, taken across a signal spectrum (usually a STFT spectrum), which can be used to characterise the amount of high-frequency content in the signal. The magnitudes of the spectral bins are added together, but mutliplying each magnitude by the bin "position" (proportional to the frequency):
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HFC = \sum_{i=0}^{N-1}i|x(n)| </math> In contrast to perceptual measures, this is not based on any evidence about its relevance to human hearing. Despite that, it can be useful for some applications, such as onset detection. The measure has close similarities to the spectral centroid measure, being essentially the same calculation but without normalisation according to overall magnitude.
References
- P. Brossier, J. P. Bello and M. D. Plumbley. Real-time temporal segmentation of note objects in music signals, in Proceedings of the International Computer Music Conference (ICMC 2004), Miami, Florida, USA, November 1-6, 2004.
- Masri, P. (1996). Computer modeling of Sound for Transformation and Synthesis of Musical Signal. PhD dissertation, University of Bristol.
