In its current configuration, the system requires a pair of headphones because it needs to deliver sound to both ears to give the illusion of depth. It also requires some type of positioning technology that is able to accurately measure the location of users and also the direction they are facing.
Research on EMG technology is ongoing. Nobuhiko Naka, a research engineer at the Multimedia Signal Processing Laboratory, wasn't willing, however, to estimate when it could be complete.
The two prototypes aren't the first shown by NTT DoCoMo to challenge current cellular telephone technology. In 2000, the operator demonstrated at a Japanese trade show a telephone that sends sound to the ear by creating vibrations that travel along bones.
Although the company hasn't yet sold a product based on the technology, rival carrier Tu-Ka Cellular Tokyo Inc. earlier this year launched a handset produced by Sanyo Electric Co. Ltd. that uses a similar system. The Sanyo TS-41 handset looks and functions as a conventional clamshell handset but can be pressed against the user's face and the vibration function turned on when in a noisy environment.
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