Power amplification for parametric loudspeakers

Abstract

A method for minimizing the reactance of a reactive load transducer at a carrier frequency in an amplifier with a power output stage for amplifying a signal, comprises: supplying a signal to the power output stage of the amplifier which includes at least one reactive component coupled to the amplifier; and counteracting transducer reactance at a carrier frequency by interacting the signal with the at least one reactive component.

1 . A method for minimizing the reactance of a reactive load transducer at a carrier frequency in an amplifier with a power output stage for amplifying a signal, comprising:
 supplying a signal to the power output stage of the amplifier which includes at least one reactive component coupled to the amplifier; and   counteracting transducer reactance at a carrier frequency by interacting the signal with the at least one reactive component.   
     
     
         2 . A method as in  claim 1 , wherein counteracting transducer reactance further comprises counteracting the transducer reactance of a capacitive transducer load using at least one inductively reactive component. 
     
     
         3 . A method as in  claim 1 , wherein counteracting transducer reactance further comprises counteracting the transducer reactance of an inductive transducer load using at least one capacitively reactive component. 
     
     
         4 . A method for minimizing the reactance of a reactive load transducer at a transducer's off-resonant frequency in an amplifier with a power output stage for amplifying a signal, comprising the steps of:
 supplying a signal to the power output stage of the amplifier which includes at least one reactive component coupled to the amplifier; and   counteracting transducer reactance at the transducer's off-resonant frequency by interacting the signal with the at least one reactive component.   
     
     
         5 . A method as in  claim 4 , wherein counteracting transducer reactance further comprises counteracting the transducer reactance of a capacitive transducer load using at least one inductively reactive component. 
     
     
         6 . A method as in  claim 4 , wherein counteracting transducer reactance further comprises counteracting the transducer reactance of an inductive transducer load using at least one capacitively reactive component. 
     
     
         7 . A power amplification system configured for improved efficiency in a parametric loudspeaker system reproducing an amplitude modulated carrier signal that can be used to produce a parametric acoustic output, including a switching power stage that amplifies the modulated carrier signal over one of a carrier frequency and a sideband frequency at a switching frequency that is essentially an integer multiple of the carrier frequency within a frequency tolerance limit that is no greater than the lowest audible frequency of the parametric loudspeaker system.