Power amplification for parametric loudspeakers

• US 20080175404A1
• Filed: 12/28/2007
• Published: 07/24/2008
• Est. Priority Date: 07/11/2000
• Status: Abandoned Application

• Current Assignee: Turtle Beach Corporation
• Original Assignee: Turtle Beach Corporation
• Inventors: Croft, James J., Bank, Jeevan G.
• Application Number:
  US12/006,108
• Publication Number:
  US 20080175404A1
• Time in Patent Office: Days
• US Class Current: 381/77
• CPC Class Codes: H03F 2200/541 Transformer coupled at the output of an amplifier
• CPC Class Codes: H03F 3/181 Low-frequency amplifiers, e.g. audio preamplifiers
• CPC Class Codes: H03F 3/2171 with field-effect devices H03F3/2173 - H03F3/2178 take precedence
• CPC Class Codes: H03F 3/2173 of the bridge type
• CPC Class Codes: H03F 3/2178 using more than one switch or switching amplifier in parallel or in series H03F3/2173, H03F3/2175 take precedence

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.

Claims

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.