Abstract: The apparatus comprises a microcontroller (7) which receives codes representing vocabulary elements, a speech synthesizer (20) which generates, in analog form, phonemes for a loudspeaker (5) which correspond to the vocabulary elements represented by said codes, and a vocabulary memory (8, 23) which can be addressed by means of codes.In accordance with the invention the memory contains, in correspondence with a given code, the ASCII characters of the word or the groups of words designated by this code, to be displayed on a display screen (10), as well as a sequence of digital data which defines the pronunciation thereof. The apparatus comprises means (22, 7, 21) for applying said sequence of digital data to the speech synthesizer (20) when the latter is to supply the loudspeaker (5) with the vocabulary element represented by the code. Moreover, a memory containing proper names and controlled in accordance with the invention is accommodated on a removable card (23).

Abstract: The speech synthesizer generates signals for a loudspeaker on the basis of symbols defining the words to be reproduced.In accordance with the invention, the same speech synthesizer is provided with means for processing symbols of three different types, i.e.:a type representing phonetically the elements of a word to be reproduced,or a type formed by a number designating a quantity or the designation of a major route,or a type formed by a number designating a sequence prestored in a memory of the speech synthesizer and corresponding to a phrase part.A series of symbols arriving at the speech synthesizer comprises successive sequences of symbols which are arranged end to end, said sequences being of three types, a type recognition character ($, .vertline., ) being placed at each end of a sequence of a given type.