Human-Computer Interaction: Communication, Cooperation, and Application Design

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview
Figure 1: Personal Face Model Fitted onto Images
Figure 2: Personal 3D Avatar
Figure 3: Network for parameter conversion

3. VOICE DRIVEN TALKING HEAD

Multipe users' communication system in cyberspace is composed of several subprocesses expressed as follows.


3.1 Voice Capturing

At client system, on-line captured voice of each user is A/D converted by 16KHz and 16bits, and is transmitted to server system frame-by-frame through network. In a intra-net environment, no speech compression is needed but for internet application, high compression is inevitable. Current prototype system is implemented on intra-network environment.


3.2 Parameter Conversion

At server system, voice from each client is phonetically analyzed and converted to mouth shape and expression parameters. LPC Cepstrum parameters are converted into mouth shape parameters by neural network trained by vowel features. Fig.3 shows neural network structure for parameter conversion. Fig.4 shows an example

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