Disclosed are systems, devices and methodologies related to calibration of an ion based imaging apparatus such as a proton computed tomography scanner. The connector includes a bottom defining an aperture for passing electrical conductor therethrough. For each reception timing, the difference-history creation section compares the latest correlation value with a previous correlation value held by the difference-history creation section, to determine a difference history, and issues the difference history to the path selection section. By providing the presentation data this ensures that at least some variation in character appearance will automatically occur beyond that of the visemes required to make the character appear to speak. The acoustic transducer serves as a receiver or a transmitter.