Sound granulation was originally proposed in 1946 for narrow-band communication, and it has been applied to electroacoustic music since the 1970s. The technique is similar to wavelet transformation used in signal processing with some philosophical differences. In the 1980s, this technique was implemented in digital media and applied for time compression and expansion of sound that leads to compression and reconstruction.:

Author: Itagaki, Takebumi
Affiliation: Department of Engineering, Glasgow Caledonian University, Glasgow, UK
AES Convention: 108 (February 2000) Paper Number: 5126
Publication Date: February 1, 2000
Subject: Signal Processing

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