Transient Detection with Absolute Discrete Group Delay

Presented at the 2009 International Symposium on Intelligent Signal Processing and Communication Systems, December 7-9, 2009, Kanazawa, Japan.

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This paper presents a new transient detection algorithm which uses the average absolute discrete group delay as a measure for the transient characteristic of sound. It shows that a bell-shaped window function performs a high-pass effect to the spectral coefficients, leading to a concentration of group delay values in the π area for steady-state signals. This concentration is violated if a transient occurs. From this phenomenon, we derive a new transient detection method, improve it by a maximum order-filter, and show that it works well on percussive and tonal- percussive sounds.