Who is the Inventor of Differential Pulse Code Modulator(DPCM)?

Question

Hello, I would like to ask for help with my homework.. Well you see, I need to find the inventor of the Differential Pulse Code Modulator. My professor told me that Alec Reeves was not the one who invented it but a person somewhat related to A. Reeves. I would appreciate you help. Thank you.

Answer 1

http://www.birds-eye.net/definition/d/dp...   http://en.wikipedia.org/wiki/Alec_Reeves