@article{adams1984companded, title = {Companded Predictive Delta Modulation: A Low-Cost Conversion Technique for Digital Recording}, author = {Adams, Robert W.}, journal = {J. Audio Eng. Soc}, volume = {32}, number = {9}, pages = {659--672}, year = {1984}, url = {https://www.aes.org/e-lib/browse.cfm?elib=4485} }