1. An audio-visual content synthesis apparatus for (i) receiving audio-visual input signals that represent a speaker who is speaking and (ii) creating an animated version of the speaker's face that represent the speaker's speech, said apparatus comprising: means for extracting (i) audio features of the speaker's speech and (ii) visual features of the speaker's face from the audio-visual input signals; means for creating audiovisual input vectors from (i) the extracted audio features and (ii) the extracted visual features, wherein each audiovisual input vector comprises a hybrid logical unit that exhibits properties of both (a) the phonemes and (b) the visemes; means for creating audiovisual configurations from the audiovisual input vectors, wherein the audiovisual configurations comprise speaking face movement components in an audiovisual space; and means for performing a semantic association procedure on the audiovisual input vectors to obtain an association between phonemes that represent the speaker's speech and visemes that represent the speaker's face for each audiovisual input vector.