Print recognition apparatus for blind readers

The facilities offered both to designer and reader by the auditory and tactile types of reading machine are compared. Methods used for solving the problem of producing an electrical signal equivalent to each of a set of printed characters are discussed and some actual machines briefly described. The types of machine required by the blind and facilities to be given by the ultimate designs are set out. The problems of recognition of the electrical signal and storage and accessibility of the sound tracks in the auditory machine are discussed. Techniques required, some existent, others not yet available, are considered. Suggestions are offered as to the methods which may be ultimately used to solve some of the problems.