Disclosed is a method and system for allowing a recipient of a hearing aid device, and in one aspect, a bilateral hearing aid system, to locate the source of a sound signal about the recipient. The display apparatus includes a power generation, CPU or microprocessor, temperature sensor andor water flow sensors, timing circuits, and audio or verbal communication means and a display means. The second structure relates to a Raman amplifier or an optical communication system employing a tellurite fiber and a silica fiber. In this way, the mobile station can help to avoid an access handoff failure that may arise from the mobile station being busy hashing onto a paging channel when the network transmits an access response message to the mobile station. The image processing apparatus includes an image capturing unit generating a plurality of images at different visual points and a three-dimensional image processing unit extracting depth information using the plurality of images.