Parametric transducer system and related methods

• US 8,767,979 B2
• Filed: 02/07/2013
• Issued: 07/01/2014
• Est. Priority Date: 06/14/2010
• Status: Active Grant

• Current Assignee: Turtle Beach Corporation
• Original Assignee: Parametric Sound Corporation
• Inventors: Norris, Elwood G.
• Primary Examiner(s): NGUYEN, TUAN DUC
• Application Number:
  US13/761,484
• Publication Number:
  US 20130322657A1
• Time in Patent Office: 509 Days
• Field of Search: 381/77, 381/82, 381/111, 381/116, 381/117, 381/120, 381/150, 330/195, 330/196, 330/197
• US Class Current: 381/111
• CPC Class Codes: H01F 19/04 Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range resonant circuits H03H
• CPC Class Codes: H01F 3/08 made from powder powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06
• CPC Class Codes: H04R 1/42 Combinations of transducers with fluid-pressure or other non-electrical amplifying means
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones
• CPC Class Codes: H04R 9/04 Construction, mounting, or centering of coil

Abstract

A method of optimizing a parametric emitter system having a pot core transformer coupled between an amplifier and an emitter, the method comprising: selecting a number of turns required in a primary winding of the pot core transformer to achieve an optimal level of load impedance experienced by the amplifier; and selecting a number of turns required in a secondary winding of the pot core transformer to achieve electrical resonance between the secondary winding and the emitter.

Claims

1. A matching element for use in a parametric signal emitting system having an amplifier and a parametric emitter, the matching element comprising:

a pot core;

a transformer disposed within the pot core and configured to be coupled between the amplifier and the parametric emitter, the transformer comprising a primary winding with a first number of turns and a secondary winding with a second number of turns, wherein the number of turns in the primary winding of the pot core transformer is selected to present a predetermined level of load impedance to the amplifier; and

wherein the number of turns in the secondary winding of the pot core transformer is selected to achieve electrical resonance between the secondary winding and the emitter.

2. The matching element according to claim 1, wherein the pot core comprises:

an inner wall circumscribed by the primary and secondary windings of the transformer; and

an air gap formed in the inner wall, wherein a size of the air gap is selected to decrease the overall physical size of the pot core transformer while avoiding saturation of the transformer during operation of the emitter.

3. The matching element according to claim 1, wherein the pot core includes an outer wall that substantially fully encloses the windings of the transformer, and an inner wall circumscribed by the windings of the transformer.

4. The matching element according to claim 3, comprising an air gap formed in the inner wall, wherein a size of the air gap is selected to decrease the overall physical size of the pot core transformer while avoiding saturation of the transformer during operation of the emitter.

5. The matching element according to claim 1, wherein the amplifier is configured to provide a modulated ultrasonic signal to the emitter.

6. The matching element according to claim 1, wherein the predetermined level of load impedance is a level selected to present an optimal level of load impedance to the amplifier.

7. The matching element according to claim 1, wherein the predetermined level of load impedance is in the range of 8-12 ohms.

8. A matching element for use in a parametric signal emitting system having an amplifier and a parametric emitter, the matching element comprising:

a pot core including an outer wall, an inner wall and an air gap formed in the inner wall;

a step-up transformer disposed within the pot core and configured to be coupled between the amplifier and the parametric emitter, the transformer comprising a primary winding with a first number of turns and a secondary winding with a second number of turns, wherein the number of turns in the secondary winding of the pot core transformer is selected to achieve electrical resonance between the secondary winding and the emitter, and wherein a size of the air gap is selected to decrease an overall physical size of the pot core transformer while avoiding saturation of the transformer during operation of the amplifier-emitter pair.

9. The matching element according to claim 8, wherein the number of turns in the primary winding of the pot core transformer is selected to present a predetermined level of load impedance to the amplifier.

10. The matching element according to claim 8, wherein the step-up transformer comprises an autotransformer.

11. The matching element according to claim 8, wherein the pot core is configured to contain and shield the step-up transformer.

12. A parametric emitter system configured to be coupled to an amplifier, the parametric emitter system comprising:

an emitter, capable of emitting into a fluid medium a carrier signal having an audio signal modulated thereon; and

a pot core transformer, operatively coupled between the amplifier and the emitter;

wherein

a secondary winding of the pot core transformer and the emitter are arranged in a parallel resonant circuit.

13. The parametric emitter system according to claim 12, wherein the carrier signal is an ultrasonic carrier signal.

14. The parametric emitter system according to claim 12, wherein the transformer comprises a primary winding with a first number of turns and a secondary winding with a second number of turns, wherein the number of turns in the secondary winding of the pot core transformer is selected to achieve electrical resonance between the secondary winding and the emitter.

15. The parametric emitter system according to claim 12, wherein the transformer comprises a primary winding with a first number of turns and a secondary winding with a second number of turns, wherein the number of turns in the primary winding of the pot core transformer is selected to present a predetermined level of load impedance to the amplifier.

16. The parametric emitter system according to claim 12, wherein the pot core comprises:

an inner wall circumscribed by the primary and secondary windings of the transformer; and

an air gap formed in the inner wall, wherein a size of the air gap is selected to decrease the overall physical size of the pot core transformer while avoiding saturation of the transformer during operation of the emitter.

17. The parametric emitter system according to claim 12, wherein the pot core includes an outer wall that substantially fully encloses the windings of the transformer, and an inner wall circumscribed by the windings of the transformer.

18. The parametric emitter system according to claim 17, further comprising an air gap formed in the inner wall, wherein a size of the air gap is selected to decrease the overall physical size of the pot core transformer while avoiding saturation of the transformer during operation of the emitter.

19. A matching element for use in a parametric signal emitting system having an amplifier and a parametric emitter, the matching element comprising a transformer configured to be coupled between the amplifier and the parametric emitter, the transformer comprising a primary winding with a first number of turns and a secondary winding with a second number of turns, wherein the number of turns in the primary winding of the transformer is selected to present a predetermined level of load impedance to the amplifier;

and wherein the number of turns in the secondary winding of the transformer is selected to achieve electrical resonance between the secondary winding and the emitter.