Notable contributions to wavelet theory since then can be attributed to Zweig’s discovery of the continuous wavelet transform (CWT) in 1975 (originally called the cochlear transform and discovered while studying the reaction of the ear to sound), Pierre Goupillaud, Grossmann and Morlet's formulation of what is now known as the CWT (1982), Jan-Olov Strömberg's early work on discrete wavelets (1983), the LeGall-Tabatabai (LGT) 5/3 wavelet developed by Didier Le Gall and Ali J. Tabatabai (1988), Ingrid Daubechies' orthogonal wavelets with compact support (1988), Mallat's multiresolution framework (1989), Ali Akansu's Binomial QMF (1990), Nathalie Delprat's time-frequency interpretation of the CWT (1991), Newland's harmonic wavelet transform (1993), and set partitioning in hierarchical trees (SPIHT) developed by Amir Said with William A. Pearlman in 1996.