OKI's solution realises a human interface function for voice synthesis, voice recognition systems, car navigation, FM demultiplex transmissions, telphones and many more. By means of a serial or parallel control interfaces, pitch, speed, volume, etc. and male or female voices can be selected. A user-defined exception dictionary can be downloaded to expand the phonetic capability. The following table unveils the essential features of MSM7630. 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.