Time Delay Spectrometry is a three-dimensional approach to unlocking the same information as can be found through FFT analysis. The essentials of the process are stated as follows. An excitation signal, or forcing function is used to drive a transducer or transducer system. The signal (often called a chirp in the radar/sonar jargon) is a linearly swept glide tone of sinusoidal nature.

Author: Fitzgerald, Mark
Affiliation: Rosewood Sound, Vesper, NY
AES Convention: 87 (October 1989) Paper Number: 2871
Publication Date: October 1, 1989
Subject: Audio and Acoustic Tests and Measurements

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