Env contains a set of MATLAB functions that implement the spectral envelope estimation methods described in

M. Campedel-Oudot, O. Cappé, and E. Moulines. Estimation of the spectral envelope of voiced sounds using a penalized likelihood approach. IEEE Trans. Speech Audio Process., 9(5):469-481, July 2001.

The gz-compressed unix archive also contains the signal and results shown in section IV.D of the paper.