US3876035A - Acoustical testing apparatus - Google Patents

Acoustical testing apparatus Download PDF

Info

Publication number
US3876035A
US3876035A US469299A US46929974A US3876035A US 3876035 A US3876035 A US 3876035A US 469299 A US469299 A US 469299A US 46929974 A US46929974 A US 46929974A US 3876035 A US3876035 A US 3876035A
Authority
US
United States
Prior art keywords
chamber
testing apparatus
extending
acoustical testing
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US469299A
Inventor
Alan Eckel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eckel Ind Inc
Original Assignee
Eckel Ind Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eckel Ind Inc filed Critical Eckel Ind Inc
Priority to US469299A priority Critical patent/US3876035A/en
Priority to CA215,747A priority patent/CA1020874A/en
Application granted granted Critical
Publication of US3876035A publication Critical patent/US3876035A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/004—Monitoring arrangements; Testing arrangements for microphones
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/30—Monitoring or testing of hearing aids, e.g. functioning, settings, battery power

Definitions

  • Mass- 57 ABSTRACT [22] Filed: May 13, 1974 Testing apparatus for hearing aids and the like has an outer cabinet enclosed by a top, bottom and sides within which is a horn-shaped anechoic inner chamber that encloses the component to be tested, which 211 Appl. No.: 469,299
  • a cover for said UNITED STATES PATENTS chamber is lined with wedge-shaped sound absorbing 3.295.133 l2/l966 Emerson et a]. 181/33 GE Panels that extend from the downwardly 7 Claims, 6 Drawing Figures ACOUSTICAL TESTING APPARATUS
  • the principal object of my invention is to provide an improved anechoic zone in said chamber by an assembly of panels to accurately measure the response characteristics of hearing aids, small microphones and the like, said zone communicating with a well below said chamber.
  • Another object is to economize in material by forming the chamber with panels at the sides that present a smooth, even internal surface, thus avoiding the expense entailed by using wedge-shaped or other irregularly-shaped pieces.
  • FIG. I is a perspective view of my testing apparatus with a cover thereon.
  • FIG. 2 is a perspective view of said testing apparatus with the cover removed.
  • FIG. 3 is a sectional view taken on the line 3-3 of FIG. 5.
  • FIG. 4 is a sectional view taken on the line 4-4 of FIG. 2.
  • FIG. 5 is a sectional view taken on the line 5-5 of FIG. 1.
  • FIG. 6 is a sectional view taken on the line 66 of FIG. 5.
  • my acoustical testing apparatus has an outer housing or cabinet 10 having a bottom plate 12 from which side or wall means extend upwardly, there being four sides 14, 16, 18 and 20 shown.
  • a hearing aid 22, for instance, may be supported by two of said sides, as shown in said FIG. 2.
  • a sound absorbing anechoic chamber 24 having side means shown as a wall 26 formed of panels 28 laid together side-by-side, which panels may be made of fiberglass or other sound absorbing material.
  • a bottom 30 supports said wall 26 and it has an intermediate opening 32.
  • a well 34 having side means or a wall 36, extends downwardly from said bottom 30 and it has a bottom 38 connected to said sides.
  • Said well 34 is lined with sound absorbing material 40, and it communicates with said chamber opening 32, being ofgreater area thereof, being rectangular and its four sides each preferably is wider than the latter opening as shown in said FIG. 4.
  • a loud speaker 41 is received in said well 34, resting on said bottom 38.
  • Said panels 28 extend from the chamber bottom 30 straight upwardly as at 42 to an intermediate portion of said chamber as at 43 and then flare outwardly and upwardly as at 44, gradually reducing in thickness, until they terminate at the upper portion of said outer housing 10 as at 45.
  • These panels 28 may be a few inches wide, such as 4 inches, and they present a continuous even or smooth inner surface throughout the chamber wall.
  • a cover 48 for said chamber has a top 50 from which four sides 52 depend downwardly. It is lined by wellknown insulating members 54 which are wedge-shaped and extend downwardly from said top in well-known alternating positions such as shown in said FIGS. 3 and 5. Said cover sides 52 are lined with insulating material 56 which extend from the inner surfaces thereof completely around said cover.
  • my apparatus is operably associated in the usual way with well-known equipment to measure and evaluate a component to be tested.
  • Said component and a loud speaker are placed in said chamber and well respectively.
  • the loud speaker would be connected to a well-known external oscillator and amplifier and hearing aid attached to a microphone by means of a coupler.
  • the microphone is connected to a sound meter and analyzer by which the gain and frequency response can be measured.
  • Acoustical testing apparatus comprising an outer housing, a sound absorbing chamber within said outer housing having a bottom and a horn-shaped, anechoic chamber extending upwardly from said bottom and formed 'of panels in side-by-side relationship and flaring outwardly towards the top, said panels having a smooth, interior surface and varying in thickness, the lowest portions thereof being thicker than the portions forming the top of said chamber.
  • said chamber bottom having an opening spaced inwardly from the outer side extremity thereof, and a well member extending lower than said opening having an interior space extending downwardly from said bottom and communicating with said chamber opening, said well member having side means extending downwardly from said chamber bottom and a bottom connected to and extending from and between said latter side means.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

Testing apparatus for hearing aids and the like has an outer cabinet enclosed by a top, bottom and sides within which is a horn-shaped anechoic inner chamber that encloses the component to be tested, which chamber is formed of sound absorbing panels, having a smooth interior surface, and which increase in thickness from the top towards the bottom. Said chamber has a bottom and a well is formed below the bottom that communicates with the chamber and is of greater width at the point of communication. A cover for said chamber is lined with wedge-shaped sound absorbing panels that extend from the top downwardly.

Description

FiPslia UR newness .jEfn'l'fi-i ROOM United States Pate 1. t t 1111 3,876,035
Eckel Apr. 8, 1975 ACOUSTICAL TESTING APPARATUS Primary Eraminer-Richard B. Wilkinson Assistant Examiner-John F. Gonzales l tzAl EkLW fd,M.. [75] men or an c e est or ass Attorney, Agent. or Firm-Harold E. Cole [73] Assignee: Eckel Industries, Inc., Qambridge.
Mass- 57 ABSTRACT [22] Filed: May 13, 1974 Testing apparatus for hearing aids and the like has an outer cabinet enclosed by a top, bottom and sides within which is a horn-shaped anechoic inner chamber that encloses the component to be tested, which 211 Appl. No.: 469,299
[52] U.S. Cl. 181/33 GE h m er i formed of sound a r ing p n l h ing [51] Int. Cl E04b 1/84 a smooth interior surface, and which increase in thick- [58] Field of Search 181/33 GD, 33 GE, 33 K; ness from the top towards the bottom. Said chamber 73/552; 343/18 A; 179/107 R, 175 has a bottom and a well is formed below the bottom that communicates with the chamber and is of greater [56] References Cited width at the point of communication. A cover for said UNITED STATES PATENTS chamber is lined with wedge-shaped sound absorbing 3.295.133 l2/l966 Emerson et a]. 181/33 GE Panels that extend from the downwardly 7 Claims, 6 Drawing Figures ACOUSTICAL TESTING APPARATUS The principal object of my invention is to provide an improved anechoic zone in said chamber by an assembly of panels to accurately measure the response characteristics of hearing aids, small microphones and the like, said zone communicating with a well below said chamber.
Another object is to economize in material by forming the chamber with panels at the sides that present a smooth, even internal surface, thus avoiding the expense entailed by using wedge-shaped or other irregularly-shaped pieces.
The foregoing and other objects which will appear as the nature of the invention is better understood, may be accomplished by a construction, combination and arrangement of parts such as is disclosed by the drawing. The nature of the invention is such as to render it susceptible to various changes and modifications, and therefore I am not to be limited to the construction disclosed by the drawing, nor to the particular par'ts described in the specification; but am entitled to all such changes therefrom as fall within the scope of my invention.
In the drawing:
FIG. I is a perspective view of my testing apparatus with a cover thereon.
FIG. 2 is a perspective view of said testing apparatus with the cover removed.
FIG. 3 is a sectional view taken on the line 3-3 of FIG. 5.
FIG. 4 is a sectional view taken on the line 4-4 of FIG. 2.
FIG. 5 is a sectional view taken on the line 5-5 of FIG. 1.
FIG. 6 is a sectional view taken on the line 66 of FIG. 5.
As illustrated, my acoustical testing apparatus has an outer housing or cabinet 10 having a bottom plate 12 from which side or wall means extend upwardly, there being four sides 14, 16, 18 and 20 shown. A hearing aid 22, for instance, may be supported by two of said sides, as shown in said FIG. 2.
Within said outer housing 10 is a sound absorbing anechoic chamber 24 having side means shown as a wall 26 formed of panels 28 laid together side-by-side, which panels may be made of fiberglass or other sound absorbing material. A bottom 30 supports said wall 26 and it has an intermediate opening 32. A well 34, having side means or a wall 36, extends downwardly from said bottom 30 and it has a bottom 38 connected to said sides. Said well 34 is lined with sound absorbing material 40, and it communicates with said chamber opening 32, being ofgreater area thereof, being rectangular and its four sides each preferably is wider than the latter opening as shown in said FIG. 4. A loud speaker 41 is received in said well 34, resting on said bottom 38. Said panels 28 extend from the chamber bottom 30 straight upwardly as at 42 to an intermediate portion of said chamber as at 43 and then flare outwardly and upwardly as at 44, gradually reducing in thickness, until they terminate at the upper portion of said outer housing 10 as at 45. These panels 28 may be a few inches wide, such as 4 inches, and they present a continuous even or smooth inner surface throughout the chamber wall.
A cover 48 for said chamber has a top 50 from which four sides 52 depend downwardly. It is lined by wellknown insulating members 54 which are wedge-shaped and extend downwardly from said top in well-known alternating positions such as shown in said FIGS. 3 and 5. Said cover sides 52 are lined with insulating material 56 which extend from the inner surfaces thereof completely around said cover.
In use my apparatus is operably associated in the usual way with well-known equipment to measure and evaluate a component to be tested. Said component and a loud speaker are placed in said chamber and well respectively. The loud speaker would be connected to a well-known external oscillator and amplifier and hearing aid attached to a microphone by means of a coupler. The microphone is connected to a sound meter and analyzer by which the gain and frequency response can be measured.
What I claim is:
l. Acoustical testing apparatus comprising an outer housing, a sound absorbing chamber within said outer housing having a bottom and a horn-shaped, anechoic chamber extending upwardly from said bottom and formed 'of panels in side-by-side relationship and flaring outwardly towards the top, said panels having a smooth, interior surface and varying in thickness, the lowest portions thereof being thicker than the portions forming the top of said chamber.
2. Acoustical testing apparatus as set forth in claim 1, portions of said panels extending from said lowest portions straight upwardly and portions extending up wardly from the latter flaring outwardly and terminating at a point adjacent the top and side of said housing.
3. Acoustical testing apparatus as set forth in claim 1, said chamber bottom having an opening spaced inwardly from the outer side extremity thereof, and a well member extending lower than said opening having an interior space extending downwardly from said bottom and communicating with said chamber opening, said well member having side means extending downwardly from said chamber bottom and a bottom connected to and extending from and between said latter side means.
4. Acoustical testing apparatus as set forth in claim 3, said well member and its interior space extending laterally beyond said chamber opening.
5. Acoustical testing apparatus as set forth in claim 3, and sound absorbing material extending inwardly of and in contact with said well member side means and bottom.
6. Acoustical testing apparatus as set forth in claim 3, said housing having a bottom plate below said well bottom and communicating with said well interior space.
7. Acoustical testing apparatus as set forth in claim 1, and a cover for said housing having wedge-shaped, insulating members extending downwardly from said cover and being spaced from the lower extremity

Claims (7)

1. Acoustical testing apparatus comprising an outer housing, a sound absorbing chamber within said outer housing having a bottom and a horn-shaped, anechoic chamber extending upwardly from said bottom and formed of panels in side-by-side relationship and flaring outwardly towards the top, said panels having a smooth, interior surface and varying in thickness, the lowest portions thereof being thicker than the portions forming the top of said chamber.
2. Acoustical testing apparatus as set forth in claim 1, portions of said panels extending from said lowest portions straight upwardly and portions extending upwardly from the latter flaring outwardly and terminating at a point adjacent the top and side of said housing.
3. Acoustical testing apparatus as set forth in claim 1, said chamber bottom having an opening spaced inwardly from the outer side extremity thereof, and a well member extending lower than said opening having an interior space extending downwardly from said bottom and communicating with said chamber opening, said well member having side means extending downwardly from said chamber bottom and a bottom connected to and extending from and between said latter side means.
4. Acoustical testing apparatus as set forth in claim 3, said well member and its interior space extending laterally beyond said chamber opening.
5. Acoustical testing apparatus as set forth in claim 3, and sound absorbing material extending inwardly of and in contact with said well member side means and bottom.
6. Acoustical testing apparatus as set forth in claim 3, said housing having a bottom plate below said well bottom and communicating with said well interior space.
7. Acoustical testing apparatus as set forth in claim 1, and a cover for said housing having wedge-shaped, insulating members extending downwardly from said cover and being spaced from the lower extremity thereof upwardly.
US469299A 1974-05-13 1974-05-13 Acoustical testing apparatus Expired - Lifetime US3876035A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US469299A US3876035A (en) 1974-05-13 1974-05-13 Acoustical testing apparatus
CA215,747A CA1020874A (en) 1974-05-13 1974-12-11 Sound absorbing acoustical testing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US469299A US3876035A (en) 1974-05-13 1974-05-13 Acoustical testing apparatus

Publications (1)

Publication Number Publication Date
US3876035A true US3876035A (en) 1975-04-08

Family

ID=23863255

Family Applications (1)

Application Number Title Priority Date Filing Date
US469299A Expired - Lifetime US3876035A (en) 1974-05-13 1974-05-13 Acoustical testing apparatus

Country Status (2)

Country Link
US (1) US3876035A (en)
CA (1) CA1020874A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893695A (en) * 1987-06-16 1990-01-16 Matsushita Electric Industrial Co., Ltd. Speaker system
US20090178878A1 (en) * 2008-01-10 2009-07-16 Douglas Frank Winker Methods for producing acoustic sources
CN100544503C (en) * 2004-11-19 2009-09-23 南京大学 Loudspeaker unit method of testing and test baffle
CN101662719A (en) * 2008-08-29 2010-03-03 深圳富泰宏精密工业有限公司 Isolation box for audio-frequency test
US20110095932A1 (en) * 2009-05-28 2011-04-28 Mark Winebrand Absorber Assembly for an Anechoic Chamber
US20110226544A1 (en) * 2010-03-16 2011-09-22 Rasco Gmbh Microelectromechanical System Testing Device
GB2492388A (en) * 2011-06-30 2013-01-02 Wolfson Microelectronics Plc Low frequency acoustic test source
US20140076052A1 (en) * 2012-09-14 2014-03-20 Robert Bosch Gmbh Testing for defective manufacturing of microphones and ultralow pressure sensors
EP3016410A4 (en) * 2013-06-26 2017-03-22 Kyocera Corporation Measurement device and measurement system
WO2018140705A1 (en) 2017-01-26 2018-08-02 W. L. Gore & Associates, Inc. High throughput acoustic vent structure test apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295133A (en) * 1965-12-16 1966-12-27 William H Emerson Anechoic chamber

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295133A (en) * 1965-12-16 1966-12-27 William H Emerson Anechoic chamber

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893695A (en) * 1987-06-16 1990-01-16 Matsushita Electric Industrial Co., Ltd. Speaker system
CN100544503C (en) * 2004-11-19 2009-09-23 南京大学 Loudspeaker unit method of testing and test baffle
US20090178878A1 (en) * 2008-01-10 2009-07-16 Douglas Frank Winker Methods for producing acoustic sources
US7610810B2 (en) * 2008-01-10 2009-11-03 Ets-Lindgren, L.P. Methods for producing acoustic sources
US8144885B2 (en) * 2008-08-29 2012-03-27 Chi Mei Communication Systems, Inc. Sound insulating device
CN101662719A (en) * 2008-08-29 2010-03-03 深圳富泰宏精密工业有限公司 Isolation box for audio-frequency test
CN101662719B (en) * 2008-08-29 2013-11-06 深圳富泰宏精密工业有限公司 Isolation box for audio-frequency test
US20100054487A1 (en) * 2008-08-29 2010-03-04 Chi Mei Communication Systems, Inc. Sound insulating device
US20110095932A1 (en) * 2009-05-28 2011-04-28 Mark Winebrand Absorber Assembly for an Anechoic Chamber
US7940204B1 (en) * 2009-05-28 2011-05-10 Orbit Advanced Technologies, Inc. Absorber assembly for an anechoic chamber
US8336670B2 (en) 2010-03-16 2012-12-25 Rasco Gmbh Microelectromechanical system testing device
EP2373066A1 (en) * 2010-03-16 2011-10-05 Rasco GmbH Microelectromechanical system testing device
US20110226544A1 (en) * 2010-03-16 2011-09-22 Rasco Gmbh Microelectromechanical System Testing Device
GB2492388A (en) * 2011-06-30 2013-01-02 Wolfson Microelectronics Plc Low frequency acoustic test source
US20140076052A1 (en) * 2012-09-14 2014-03-20 Robert Bosch Gmbh Testing for defective manufacturing of microphones and ultralow pressure sensors
US9400262B2 (en) * 2012-09-14 2016-07-26 Robert Bosch Gmbh Testing for defective manufacturing of microphones and ultralow pressure sensors
EP3016410A4 (en) * 2013-06-26 2017-03-22 Kyocera Corporation Measurement device and measurement system
US9872113B2 (en) 2013-06-26 2018-01-16 Kyocera Corporation Measurement device and measurement system
WO2018140705A1 (en) 2017-01-26 2018-08-02 W. L. Gore & Associates, Inc. High throughput acoustic vent structure test apparatus
DE112018000543T5 (en) 2017-01-26 2019-10-10 W.L. Gore & Associates, Inc. HIGH-PERFORMANCE TEST DEVICE FOR AN ACOUSTIC VENTILATION STRUCTURE

Also Published As

Publication number Publication date
CA1020874A (en) 1977-11-15

Similar Documents

Publication Publication Date Title
Thuras et al. Extraneous frequencies generated in air carrying intense sound waves
US3876035A (en) Acoustical testing apparatus
US5168525A (en) Boundary-layer microphone
ATE253287T1 (en) DEVICE HAVING A HOUSING THAT CONTAINS A SOUND TRANSDUCER AND HAVING A FEEDTHROUGH
CA2247278C (en) Acoustic element and method for sound processing
Koidan et al. Acoustical properties of the National Bureau of Standards anechoic chamber
US3923119A (en) Sound pressure box
JPS54146676A (en) Acoustical measuring device
JPH0515972B2 (en)
JPH0727387B2 (en) Small reverberation room
JPS5676060A (en) Electric field strength detector
JPH0330837Y2 (en)
US3080013A (en) Speaker enclosure
US2908772A (en) Electroacoustical transducer
Bedell et al. Reverberation Time and Absorption Measurements with the High Speed Level Recorder
Meeker et al. The acoustical impedance of closed rectangular loudspeaker housings
US3434564A (en) Sound reproduction system
Capetanopoulos Measurement of the directivity characteristics of loudspeakers and microphones in a reverberant enclosure
JP3873801B2 (en) Piezoelectric sounder sound pressure measuring method and sound pressure measuring device
Corliss et al. A Cavity Pressure Method for Measuring the Gain of Hearing Aids
Filatov On Electronic Formation of Directivity Characteristics of a Microphone
JPS5439120A (en) Speaker characteristics measuring device
US1976692A (en) Microphone
US1710482A (en) Cabinet
SU1315883A1 (en) Transducer of gas moisture content