Parametric loudspeaker with electro-acoustical diaphragm transducer
A method is disclosed for generating parametric audio output based on the interaction of multiple ultrasonic outputs within air as a nonlinear medium. The method includes the step of generating an electronic signal comprising at least two ultrasonic signals having a difference in value which falls within an audio frequency range. The electronic signal can be transferred to an electrostatic emitter diaphragm which couples directly with the air as part of a single stage energy conversion process. The electronic signal can be converted at the diaphragm directly to a mechanical displacement as a driver member of a parametric speaker. The ultrasonic signals can be mechanically emitted from the diaphragm into the air as ultrasonic compression waves which interact within the air to generate the parametric audio output.
1 . A method for generating parametric audio output based on interaction of multiple ultrasonic outputs within air as a nonlinear medium, said method comprising the steps of:
a) generating an electronic signal comprising at least two ultrasonic signals having a difference in value which falls within an audio frequency range;
b) transferring the electronic signal to an electrostatic emitter diaphragm which couples directly with the air as part of a single stage energy conversion process;
c) converting the electronic signal at the diaphragm directly to mechanical displacement as a driver member of a parametric speaker; and
d) mechanically emitting the at least two ultrasonic signals from the diaphragm into the air as ultrasonic compression waves which interact within the air to generate the parametric audio output.
2 . A method as defined in claim 1 , wherein step b) comprises the more specific step of transferring the electronic signal to an electrostatic transducer.
3 . A method as defined in claim 1 , wherein step b) comprises the more specific step of transferring the electronic signal to an electret transducer.
4 . A method as defined in claim 1 , wherein step b) comprises the more specific step of transferring the electronic signal to an electro mechanical film diaphragm as the electrostatic emitter diaphragm.
5 . A method as defined in claim 1 , wherein step b) comprises the more specific step of transferring the electronic signal to a plastic film diaphragm as the electrostatic emitter diaphragm.