A spelling learning aid in which an operator orally establishes the words and tactily establishes the correct spelling for later testing by the learning aid. In the preferred embodiment, the operator states words which are analyzed and synthesis control data is derived therefrom. This synthesis control...http://www.google.de/patents/US4749353?utm_source=gb-gplus-sharePatent US4749353 - Talking electronic learning aid for improvement of spelling with operator-controlled word list
