Apparatus for controlling production of speech or text

摘要

To enable a physically severely disabled person to produce messages in the form of speech or printed text, a central processor 29 is provided with a program in a read only memory 34 which includes look-up tables of ASCII codes for a speech synthesizer unit or a printer. The appropriate look-up table is addressed by computing the required address from the coordinates of a selected display element of a LED matrix indicator 19, the selected element displaying a message element chosen by the user by operation of two input switches of input circuitry 45. The program also enables series of coordinates of successive LEDs selected in the matrix indicator 19 to be stored in temporary RAM stores and recalled subsequently as required, with retrieval of corresponding ASCII codes during the recall so that a stored message can be replayed as speech or printed text when required.