WO1999018755A1 - An improved low frequency transducer enclosure - Google Patents
An improved low frequency transducer enclosure Download PDFInfo
- Publication number
- WO1999018755A1 WO1999018755A1 PCT/US1998/020817 US9820817W WO9918755A1 WO 1999018755 A1 WO1999018755 A1 WO 1999018755A1 US 9820817 W US9820817 W US 9820817W WO 9918755 A1 WO9918755 A1 WO 9918755A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acoustic
- lever
- interior
- transducer
- enclosure
- Prior art date
Links
- 238000005192 partition Methods 0.000 claims description 14
- 238000000638 solvent extraction Methods 0.000 claims 3
- 238000006073 displacement reaction Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
- H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers
Definitions
- An acoustic lever is a mechanical device constructed of two rigid surfaces rigidly coupled together and compliantly supported so as to allow motion along a line. The two surfaces have projections onto a plane perpendicular to the axis of motion with areas denoted as the driven area or the radiating area.
- An acoustic lever can be constructed from two standard loudspeaker cones with their attached outside supporting compliances. Placed apex to apex the two cones are glued together and mounted in an enclosure by gluing the supporting compliance at its outside edge. In this way the two cones will be free to move along their common axis.
- This device will be called an acoustic lever for purposes of this document.
- both Dusanek and Clarke used acoustic levers in their inventions, although in completely different configurations than those described herein.
- FIG. 5 a chart is illustrated which shows the theoretical improvement in radiated pressure that is to be expected from my invention.
- This figure compares a standard bandpass tuning of the fourth order variety with a Q of about .7 (as described in my paper "An Introduction to Bandpass Loudspeaker Systems")(lower curve) with an enclosure system utilizing an acoustic lever (upper curve).
- the transducer and enclosure volumes in this figure have been held constant.
- the specific design of the acoustic lever shown in FIG. 5 operates in a bandpass mode wherein the acoustic mass of lever 80 and the volume of the chamber 30 are adjusted so as to resonant at the resonance frequency of transducer 70 when placed in chamber 40.
- This feature would be useful, for example, in an application where it is impractical to use more than a single transducer because of space issues. Examples of this type of application are hearing aid transducers and earphone transducers. It is a further feature of my invention that the acoustic distortion of the system would be lowered. It is a well known effect of nonlinear distortion in transducers that a non-symmetric noniinearity will cause the diaphragm to exhibit a static displacement, thus moving the cone into regions of even higher non- linearity. This static force is opposed by the system stiffness seen by the transducer at zero frequency.
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98950880A EP1033061A1 (en) | 1997-10-02 | 1998-10-01 | An improved low frequency transducer enclosure |
US09/508,790 US6782112B1 (en) | 1997-10-02 | 1998-10-01 | Low frequency transducer enclosure |
JP2000515410A JP2001519637A (en) | 1997-10-02 | 1998-10-01 | Improved low frequency converter enclosure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6054697P | 1997-10-02 | 1997-10-02 | |
US60/060,546 | 1997-10-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999018755A1 true WO1999018755A1 (en) | 1999-04-15 |
Family
ID=22030182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/020817 WO1999018755A1 (en) | 1997-10-02 | 1998-10-01 | An improved low frequency transducer enclosure |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1033061A1 (en) |
JP (1) | JP2001519637A (en) |
WO (1) | WO1999018755A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6169811B1 (en) | 1999-03-02 | 2001-01-02 | American Technology Corporation | Bandpass loudspeaker system |
US6704426B2 (en) | 1999-03-02 | 2004-03-09 | American Technology Corporation | Loudspeaker system |
CN103929702A (en) * | 2014-04-17 | 2014-07-16 | 北京信息科技大学 | Double-piezoelectric-type bone conduction auditory device based on displacement amplification |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4224469A (en) * | 1979-01-02 | 1980-09-23 | Karson Theodore R | Stereo speaker system |
US4301332A (en) * | 1980-01-08 | 1981-11-17 | Norman Dusanek | Woofer loudspeaker |
US4805221A (en) * | 1984-04-17 | 1989-02-14 | Quaas Juergen | Construction of sound converter in sound guide, especially for loudspeakers, for example speaker boxes |
US5475764A (en) * | 1992-09-30 | 1995-12-12 | Polk Investment Corporation | Bandpass woofer and method |
US5647012A (en) * | 1996-06-10 | 1997-07-08 | Han; Sang Wu | Tri-chamber speaker box |
-
1998
- 1998-10-01 JP JP2000515410A patent/JP2001519637A/en not_active Withdrawn
- 1998-10-01 WO PCT/US1998/020817 patent/WO1999018755A1/en not_active Application Discontinuation
- 1998-10-01 EP EP98950880A patent/EP1033061A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4224469A (en) * | 1979-01-02 | 1980-09-23 | Karson Theodore R | Stereo speaker system |
US4301332A (en) * | 1980-01-08 | 1981-11-17 | Norman Dusanek | Woofer loudspeaker |
US4805221A (en) * | 1984-04-17 | 1989-02-14 | Quaas Juergen | Construction of sound converter in sound guide, especially for loudspeakers, for example speaker boxes |
US5475764A (en) * | 1992-09-30 | 1995-12-12 | Polk Investment Corporation | Bandpass woofer and method |
US5647012A (en) * | 1996-06-10 | 1997-07-08 | Han; Sang Wu | Tri-chamber speaker box |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6169811B1 (en) | 1999-03-02 | 2001-01-02 | American Technology Corporation | Bandpass loudspeaker system |
EP1188353A1 (en) * | 1999-03-02 | 2002-03-20 | American Technology Corporation | Bandpass loudspeaker system |
US6704426B2 (en) | 1999-03-02 | 2004-03-09 | American Technology Corporation | Loudspeaker system |
EP1188353A4 (en) * | 1999-03-02 | 2008-06-18 | American Tech Corp | Bandpass loudspeaker system |
CN103929702A (en) * | 2014-04-17 | 2014-07-16 | 北京信息科技大学 | Double-piezoelectric-type bone conduction auditory device based on displacement amplification |
CN103929702B (en) * | 2014-04-17 | 2017-01-18 | 北京信息科技大学 | Double-piezoelectric-type bone conduction auditory device based on displacement amplification |
Also Published As
Publication number | Publication date |
---|---|
EP1033061A1 (en) | 2000-09-06 |
JP2001519637A (en) | 2001-10-23 |
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