Electroacoustic Transducer System and Manufacturing Method Thereof

• US 20070223735A1
• Filed: 03/27/2007
• Published: 09/27/2007
• Est. Priority Date: 03/27/2006
• Status: Abandoned Application

• Current Assignee: Knowles Electronics Llc (Knowles Corporation)
• Original Assignee: Knowles Electronics Llc (Knowles Corporation)
• Inventors: Jayanth, Vignesh, Massingill, Gwendolyn, LoPresti, Janice
• Application Number:
  US11/691,947
• Publication Number:
  US 20070223735A1
• Time in Patent Office: Days
• US Class Current: 381/99
• 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 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 3/14 Cross-over networks

Abstract

A transducer system may include multiple transducers. The transducers may be mounted together and may include either the same transducer type or different transducer types, depending on the desired applications. The transducers may be receivers which are aligned and joined. A coupling circuit may be provided and coupled to one or both of the transducers.

Claims

1. An electroacoustic transducer system including a nigh frequency transducer and a low frequency transducer, each of the transducers comprising:

a housing, the housing defining an inner cavity, an acoustic assembly disposed within the housing for creating sound pressure divides the inner cavity into a front volume and a back volume, and

a cross-over network coupled to the high frequency transducer for directing a high input frequency to drive the high frequency transducer;

wherein each of the transducers comprises an acoustical filter formed on a wall of the housing communicating between the back volume and a surrounding environment.

2. The electroacoustic transducer system of claim 1, wherein the cross-over network is selected from the group comprising a passive filter, an active filter, a biamplification circuit, a triamplification circuit, an audio cross-over, a N-way cross-over, an analog cross-over, a digital cross-over, a discrete-time (sampled) cross-over, a continuous-time cross-over, a linear filter, a non-linear filter, an infinite impulse response filter, a finite impulse response filter or combinations thereof.

3. The electroacoustic transducer system of claim 1, comprising a second cross-over network coupled to the low frequency transducer, the second cross-over being a low frequency cross-over.

4. The electroacoustic transducer system of claim 3, wherein the second cross-over network is selected from the group comprising a passive filter, an active filter, a biamplification circuit, a triamplification circuit, an audio cross-over, a N-way cross-over, an analog cross-over, a digital cross-over, a discrete-time (sampled) cross-over, a continuous-time cross-over, a linear filter, a non-linear filter, an infinite impulse response filter, a finite impulse response filter or combinations thereof.

5. The electroacoustic transducer system of claim 1, wherein the acoustical filter is an external vent.

6. The eletroacoustic transducer system of claim 5, wherein the acoustical filter has an opening dimension equal or less than 0.003 inches.

7. The electroacoustic transducer system of claim 5, wherein the acoustical filter has an opening dimension greater than 0.003 inches.

8. The electroacoustic transducer system of claim 1, wherein the acoustic assembly of the low frequency transducer is un-pierced.

9. The electroacoustic transducer system of claim 1, the high frequency transducer comprising a shorter armature, a shorter drive coil, and thicker drive magnets.

10. The electroacoustic transducer system of claim 1, wherein a mid range frequency transducer is coupled in parallel with the high frequency transducer and the low frequency transducer.

11. The electroacoustic transducer system of claim 10, wherein a third cross-over network couples to the mid frequency transducer, the third cross-over being a mid frequency cross-over.

12. The electroacoustic transducer system of claim 11, wherein the third cross-over network is selected from the group consisting of a passive filter, an active filter, a biamplification circuit, a triamplification circuit, an audio cross-over, a N-way cross-over, an analog cross-over, a digital cross-over, a discrete-time (sampled) cross-over, a continuous-time cross-over, a linear filter, a non-linear filter, an infinite impulse response filter, a finite impulse response filter or combinations thereof.

13. The electroacoustic transducer system of claim 1, wherein a capsule is provided to encapsulate the system, the capsule including a shield against electromagnetic interference.

14. The electroacoustic transducer system of claim 13, wherein the capsule is made of a highly magnetic-permeability material and the housing attentuates of electrical signals or noise produced by the transducers.

20. The electroacoustic transducer system of claim 12, wherein each of the transducers comprises:

a housing, the housing defining an inner cavity, an acoustic assembly disposed within the housing dividing the inner cavity into a front volume and a back volume; and

an acoustical filter formed on a wall of each housing for communicating the back volume with the surrounding environment.

15. An electroacoustic transducer system comprising a high frequency transducer, a mid frequency transducer, and a low frequency transducer coupled in parallel, the system comprising:

an audio signal source; and

a first cross-over network coupled between the audio signal source and one of the transducers, the first cross-over having a first selected input frequency response;

wherein each transducer comprises an acoustical filter providing an extended high frequency output and a sustained low frequency output.

16. The electroacoustic transducer system of claim 15, wherein the first cross-over network is coupled to the high frequency transducer, the first cross-over being a high frequency cross-over.

17. The electroacoustic transducer system of claim 15, wherein a second cross-over network is coupled with the audio signal source and the mid frequency transducer, the second cross-over network being a mid frequency cross-over.

18. The electroacoustic transducer system of claim 15, wherein a second cross-over network is coupled with the first cross-over network and the mid frequency transducer, the second cross-over network being a mid frequency cross-over.

19. The electroacoustic transducer system of claim 15, wherein a third cross-over network is coupled with the audio signal source and the low frequency transducer, the third cross-over being a low frequency cross-over.

21. The electroacoustic transducer system of claim 15, wherein the first cross-over network is selected from the group comprising of a passive filter, an active filter, a biamplification circuit, a triamplification circuit, an audio cross-over, a N-way cross-over, an analog cross-over, a digital cross-over, a discrete-time (sampled) cross-over, a continuous-time cross-over, a linear filter, a non-linear filter, an infinite impulse response filter, a finite impulse response filter or combinations thereof.

22. The electroacoustic transducer system of claim 15, wherein the acoustical filter is an external vent.

23. The electroacoustic transducer system of claim 22, wherein the acoustical filter has an opening dimension equal or less than 0.003 inches.

24. The electroacoustic transducer system of claim 22, wherein the acoustical filter has an opening dimension greater than 0.003 inches.

25. The electroacoustic transducer system of claim 15, wherein the acoustic assembly of the low frequency transducer is un-pierced.

26. The electroacoustic transducer system of claim 15, wherein the high frequency transducer comprising a shorter armature, a shorter drive coil, and thicker drive magnets.

27. The electroacoustic transducer system of claim 15, wherein a capsule is provided to encapsulate the system, the capsule comprising a shield against electromagnetic interference.

28. The electroacoustic transducer system of claim 28, wherein the capsule is made of highly magnetic-permeability material and attenuates unwanted electrical signals or noise produced by the transducers.

29. The electroacoustic transducer system comprising:

a first transducer;

a second transducer; and

a cross-over network coupled to the first transducer or the second transducer for directing selected signals to drive the first transducer or the second transducer, respectively;

wherein the first transducer or the second transducer comprises a resistive vent.

30. The electroacoustic transducer system of claim 29, wherein each of the transducers comprise:

a housing defining an inner cavity;

an acoustic assembly disposed within the housing dividing the inner cavity into a front volume and a back volume; and

the resistive vent being formed on a wall of the housing for communicating the back volume and the surrounding.

31. The electroacoustic transducer system of claim 30, wherein the first transducer and the second transducer are coupled to an audio signal source.

32. The electroacoustic transducer system of claim 30, wherein the first and second transducers are selected from a group comprising of a high-frequency (HF) receiver, mid-range frequency receiver, low frequency (LF) receiver, upper HF receiver, lower HF receiver, upper mid-range frequency receiver, lower mid-range frequency receiver, upper LF receiver, lower LF receiver, or combination thereof.

33. The electroacoustic transducer system of claim 30, wherein the first transducer is a woofer, the woofer comprising the resistive vent to boost the low frequency output while maintaining the first resonance frequency.

34. The electroacoustic transducer system of claim 30, wherein the first transducer is a tweeter and the second transducer is a woofer, each transducer comprising a resistive vent to provide an extended high frequency output and a sustaintial low frequency output.

35. The electroacoustic transducer system of claim 30, wherein the first transducer or the second transducer comprises an un-pierced acoustic assembly.

36. The electroacoustic transducer system of claim 31, wherein a third transducer is coupled to the audio signal source.

37. The electroacoustic transducer system of claim 36, wherein a second cross-over network is coupled to the third transducer.

38. A method of making an electroacoustic transducer system comprising:

providing a first transducer including a back volume and a front volume defined by an acoustic assembly formed within a housing;

providing a second frequency transducer including a back volume and a front volume defined by an acoustic assembly formed within the housing;

coupling a cross-over network to one of the first transducer or the second transducer, the cross-over network directing a selected input frequency to drive said one transducer;

forming an acoustical filter on a wall of the housing of said one transducer;

and communicating the back volume and the surrounding via the acoustical filter.

39. The method of claim 38, wherein the cross-over network is selected from the group consisting of a passive filter, an active filter, a biamplification circuit, a triamplification circuit, an audio cross-over, a N-way cross-over, an analog cross-over, a digital cross-over, a discrete-time (sampled) cross-over, a continuous-time cross-over, a linear filter, a non-linear filter, an infinite impulse response filter, a finite impulse response filter or combinations thereof.

40. The method of claim 38, comprises coupling a second cross-over network to the second transducer, the second cross-over network directing the remaining input frequency to drive the second transducer.

41. The method of claim 40, wherein second cross-over network is selected from the group consisting of a passive filter, an active filter, a biamplification circuit, a triamplification circuit, an audio cross-over, a N-way cross-over, an analog cross-over, a digital cross-over, a discrete-time (sampled) cross-over, a continuous-time cross-over, a linear filter, a non-linear filter, an infinite impulse response filter, a finite impulse response filter or combinations thereof.

42. The method of claim 38, wherein the acoustical filter is an external vent,

43. The method of claim 38, wherein the acoustical filter has an opening dimension equal or less than 0.003 inches.

44. The method of claim 38, wherein the acoustical filter has an opening dimension greater than 0.003 inches.

45. The method of claim 38, wherein the acoustic assembly of the said one transducer is un-pierced.

46. The method of claim 38, wherein the said one transducer has a shorter armature, a shorter drive coil, and a thicker drive magnets.

47. The method of claim 38, comprising coupling a third transducer to the first and second transducers.

48. The method of claim 47, comprising coupling a third cross-over network to the third transducer.

49. The method of claim 38, comprising providing a capsule to the first and second transducer.

50. The method of claim 49, wherein the capsule is made of highly magnetic-permeability material and attenuates unwanted electrical signals or noise produced by the transducers.