A five-bit difference code used fewer bytes and caused less mean phase change than a six-bit sample code in a fixed reader on two depth SEEG rest records

We tested a fixed packet code with a public phase reader. Two depth SEEG rest records supplied eight fixed contact pairs. The five-bit difference code used 15.33 percent fewer payload bytes than the six-bit sample code. Mean phase change from the clean reader was 0.26 degrees for the difference code and 0.97 degrees for the sample code. All eight depth pairs improved. Seven other iEEG records supply supporting evidence and show failure cases. The reader and code scales stayed fixed. A fresh run reproduced the tables, packet bytes, and predictions. The archive includes voltage arrays, byte streams, three figures, source checks, code, and repeat instructions. This test measured code distortion. It did not test live stimulation or improve the reader's substantial error against the offline phase reference.

intracranial EEG · SEEG · differential pulse code modulation · phase reader · signal compression · codec distortion