Speech output can be facilitated in analog form using the internal DAC or in digital form with the Motorola ESSI interface providing 16-bit data at 16kHz sampling rate. The demo sound files are provided in MP-3 format for shorter download time. All samples are 16kHz sampling speech outputs. Please also visit Elan Informatique and tailor your own demo. As an advantage over speech synthesis based on pre-stored words, the vocabulary of TTS is unlimited.
Human speech consists of sentences, words and syllables.
Each syllable is composed of phonemes. Every language incorporates typically 30 to 50 phonemes which require only a small amount of memory for storage. Processing of these few parameters is simple but the result is poor since transitions each between two phonemes are not considered in the computation. Therefore, transitions are additionally stored. A transition is the signal between the centers of adjacent phonemes and combines the two halves of the two phonemes.