Signal modeling of the conditioning stage of a parametric array loudspeaker by statistical design of experiments

Parametric Array Loudspeaker is a directional sound technology that uses ultrasound amplitude modulation to generate audible in specific propagation path. The mathematical modeling of this an interesting problem cannot be tackled analytically due nonlinear phenomenon associated with the production from ultrasound, i.e. self-demodulation. Self-demodulation affects quality by both introducing undesired harmonic content and reducing drastically intensity low frequencies. steps within Digital Signal Processor having greatest effect on self-demodulation at conditioning stage ultrasonic signal were detected empirical models account for response variables such as total distortion perceived fundamental tone elaborated using statistical Design Experiments. This methodology permitted identification mono peak compressor variable largest influence regard variables.