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An alternative auditory code is suggested to alleviate the reading problem presented by the Optophone in its older form. A ``musical'' code is discussed which has a high degree of coalescence. Physically it takes the form of an FM squarewave. As for the Optophone, a slit scanner is employed to scan along the line of print. Using N<L>y</L> photocells, the same number of binary signals b<L>1</L>...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.