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  Spectratech OEG-16H is designed to simultaneously measure a change of the amount of blood in each in vivo part not so deep in by the multi-channel (up to 16 channels) method. It utilizes the light absorption characteristics in the neighborhood of near infrared to red light that changes with the bonding state of the in vivo hemoglobin (Hb) with oxygen. The spread spectrum modulation method that is the latest digital technique and originally developed by our company is adopted for the optical modem technology that underlies the equipment. It has achieved great reduction in costs, downsizing, and high performance compared with the conventional technologies.