Active acoustic meta material loudspeaker system and the process to make the same

• US 9,930,443 B1
• Filed: 08/04/2017
• Issued: 03/27/2018
• Est. Priority Date: 12/02/2016
• Status: Active Grant

• Current Assignee: AcoustiX VR Inc.
• Original Assignee: AcoustiX VR Inc.
• Inventors: Mathur, Gopal P.
• Primary Examiner(s): Eason, Matthew
• Application Number:
  US15/668,986
• Time in Patent Office: 235 Days
• CPC Class Codes: H04R 1/24 Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
• CPC Class Codes: H04R 1/26 Spatial arrangements of separate transducers responsive to two or more frequency ranges
• CPC Class Codes: H04R 1/2811 for loudspeaker transducers
• CPC Class Codes: H04R 1/30 Combinations of transducers with horns, e.g. with mechanical matching means , i.e. front-loaded hornshorns in general G10K; transducer enclosures or mountings using a back-loaded horn H04R1/2861; application of horns as guiding means to obtain a predetermined directivity characteristic H04R1/345
• CPC Class Codes: H04R 17/00 Piezoelectric transducers; Electrostrictive transducers piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners H10N30/00
• CPC Class Codes: H04R 23/02 Transducers using more than one principle simultaneously
• CPC Class Codes: H04R 9/06 Loudspeakers

Abstract

An active acoustic meta material system with micro-perforated sheets embedded between porous layers and air gaps, around the output region in front of a speaker, perpendicular to the direction of wave propagation of the sound is disclosed. Sound input is split into two frequency ranges by an active controller, such that a higher frequency range is sent to a traditional speaker which outputs sound via a diaphragm which vibrates in response to electromagnetic signals generated based on the sound input. The sound waves in the lower frequency range are sent to piezoelectric or other type of motion-creating transducers which are mounted to an outer housing or casing containing a plurality of meta material sheets with insulative layers between each meta material sheet. The combination of meta material sheets and insulation layers are calibrated to focus and amplify the vibrational waves which are outputted by the transducers.

Claims

1. A casing comprising transducers bonded to its inner or outer surface abutted against at least one of a layer of insulation or a layer of micro-perforated sheet, said insulation layer and said micro-perforated sheet abutted against one another;

and

a plurality of regions where sound emanating from said transducers is calibrated to radiate with impedance matching said at least one layer of said micro-perforated sheet through which said sound waves pass through.

2. The casing of claim 1, wherein said casing is rectangular.

3. The casing of claim 1, wherein said casing is circular.

4. The casing of claim 1, wherein:

said casing is torus-shaped with said transducers bonded to its outer surface and surrounding at least one layer of said micro-perforated sheet;

at least one layer of insulation is adjacent to said at least one layer of said micro-perforated sheet;

said transducers having a working end outputting sound through said at least one micro-perforated sheet.

5. The casing of claim 1, wherein said casing is metallic.

6. The casing of claim 1 comprising:

a speaker oriented such that sound is directed substantially in a first cardinal direction;

at least two said micro-perforated sheets surrounding said insulation layer oriented with individual sheets transverse to said first cardinal direction;

a portal surrounded by said micro-perforated sheets open to said speaker such that a majority of said sound passes through said portal when said speaker emits sound.

7. The casing of claim 6, wherein said portal has a diameter substantially equal to a widest diameter of said speaker.

8. The casing of claim 7, wherein said portal is centered over a most elongated length of said speaker.

9. The casing of claim 1 further comprising:

a speaker oriented such that sound is directed substantially in a first cardinal direction;

a portal surrounded by said layer of insulation or said layer of micro-perforated sheet open to said speaker such that a majority of said sound passes through said portal when said speaker emits sound.