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Patents : Sound and vision

Pictures of spreads from New Scientist magazine

BODY language has been given a twist by three Russian inventors who have filed a European patent (766 218) on a method for simulating sight for the blind.

The technique uses a computer to convert text into pulses received by five vibrating pads fastened to the body. The letter A is represented by a buzz from a single pad, while B is a buzz from two points.

Fewer vibrating pads could be used if they switch between different frequencies, such as 20 Hz, 50 Hz and 120 Hz, as well as switching on and off. Alternatively, the patent suggests, the pads could switch between hot and cold.

The inventors say the system has been tried in a factory, with sensors on a blind worker's wrist. In three days the man learnt how to monitor and adjust the pressure on a steam generator, responding to pulses generated by the machine's pressure ...



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