Patent ID: 7596229

Claim:
A method for operating a parametric loudspeaker system in both a non-saturated air medium and a saturated air medium, comprising: a) receiving at least one audio input signal; b) generating an ultrasonic carrier signal; c) parametrically modulating the audio input signal and ultrasonic carrier signal to produce a parametric ultrasonic signal; d) operating a signal processor in a first predetermined signal processing mode when the parametric loudspeaker is operating in the non-saturated air medium to create a double sideband parametric ultrasonic signal having a low modulation index; e) operating the signal processor in a second predetermined signal processing mode that is distinct from the first predetermined signal processing mode when the parametric loudspeaker is operating in the saturated air medium to create a double sideband parametric ultrasonic signal having a higher modulation index than that of the first predetermined signal processing mode; and f) emitting a parametric ultrasonic wave into the air medium to produce a decoupled audio wave.