US3470976A - High fidelity speaker - Google Patents
High fidelity speaker Download PDFInfo
- Publication number
- US3470976A US3470976A US689726A US3470976DA US3470976A US 3470976 A US3470976 A US 3470976A US 689726 A US689726 A US 689726A US 3470976D A US3470976D A US 3470976DA US 3470976 A US3470976 A US 3470976A
- Authority
- US
- United States
- Prior art keywords
- speaker
- high fidelity
- chamber
- chambers
- opening
- 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
Links
- 239000000463 material Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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
- 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
- H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
Definitions
- My invention relates to speakers for high fidelity sound reproduction.
- An object of the invention is to eifect thorough uniformity of tonality, particularly quality and strength, throughout the audible range of sound reproduced. Another objective is uniform and pleasing timbre and tone color throughout the audible range. ,Still another objective is omnipresence of all the sound reproduced throughout the audible range. Attainment of these objectives while producing full strength of sound at low power input is an important result of my invention.
- the single figure of the drawing shows in a side elevational view, partially in vertical section, a speaker embodying the invention.
- vertical walls 10 and a partition or diaphragm 11 form an upper cell or chamber 12 and a lower cell or chamber 13.
- the upper end of chamber 12 is provided with a top or cover 14 having an opening 15.
- the lower end of chamber 13 is provided with a bottom or cover 16 having a smaller opening 17.
- the partition 11 is provided with a still smaller opening 18.
- a cone type speaker unit 19 is rigidly attached to an aluminum baflle plate 20 which is resiliently supported on the top cover 14 by caulking compound or soft rubber to seal the opening 15 and hold the speaker unit 19 in juxtaposition to that opening.
- the walls 10 of the chambers 12 and 13 may be either curvilinear or rectilinear, but the height of chamber 12 is approximately twice the height of chamber 13 and the sum of the heights of chambers 12 and 13 is at least three times any wall-to-wall horizontal dimension in chambers 12 and 13.
- the area of opening 18 in the cell separator '11 is onehalf or less than one-half the area of the bottom vent or opening 17.
- the walls 10 are preferably composed of material having a natural resonance frequency beyond audible range, meaning above or below the frequencies that people can hear.
- materials which I have used 3,470,976 Patented Oct. 7, 1969 include heavy limestone, a light plastic such as foamed polystyrene, and paper sheet rolled upon itself with a silicate binder.
- the speaker is provided with legs 21 or a like support structure to elevate the bottom 16 above the supporting surface to permit movement of air in the bottom vent 17.
- a speaker constructed substantially as described and illustrated produces all the objectives of the invention when the speaker unit 19 is energized.
- the double tuning of chambers 12 and 13 with openings 18 and 17, respectively, gives a much more uniform and flat response curve. Low notes become discernible while high and medium range notes are retained at full strength with low power input, and uniform and pleasing timbre and tone color throughout the audible range.
- the third dimension of one chamber being at least twice the third dimension of the other, the sum of the third dimensions of the two chambers being at least three times any of the two dimensions,
- a diaphragm type speaker mounted in said first open- 8, a second smaller opening into said other chamber, and a third opening connecting said chambers and being not more than one-half the area of said second openmg.
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
Oct. 7, 1969 P. BREVARD 3 4 HIGH FIDELITY SPEAKER Original Filed Nov. 8, 1965 zl-dlhll I7 .LIG J INVENTOR.
United States Patent 3,470,976 HIGH FIDELITY SPEAKER Procter Brevard, 111 Washington Ave.,
Evansville, Ind. 47713 I Continuation of application Ser. No. 506,786, Nov. 8, 1965. This application Dec. 11, 1967, Ser. No. 689,726 Int. Cl. Gk 13/00; H041- 7/18 U.S. Cl. 181-31 1 Claim This is a continuation of application Ser. No. 506,786, filed Nov. 8, 1965.
My invention relates to speakers for high fidelity sound reproduction. An object of the invention is to eifect thorough uniformity of tonality, particularly quality and strength, throughout the audible range of sound reproduced. Another objective is uniform and pleasing timbre and tone color throughout the audible range. ,Still another objective is omnipresence of all the sound reproduced throughout the audible range. Attainment of these objectives while producing full strength of sound at low power input is an important result of my invention.
The single figure of the drawing shows in a side elevational view, partially in vertical section, a speaker embodying the invention.
Referring to the drawing, vertical walls 10 and a partition or diaphragm 11 form an upper cell or chamber 12 and a lower cell or chamber 13. The upper end of chamber 12 is provided with a top or cover 14 having an opening 15. The lower end of chamber 13 is provided with a bottom or cover 16 having a smaller opening 17. The partition 11 is provided with a still smaller opening 18.
A cone type speaker unit 19 is rigidly attached to an aluminum baflle plate 20 which is resiliently supported on the top cover 14 by caulking compound or soft rubber to seal the opening 15 and hold the speaker unit 19 in juxtaposition to that opening.
The walls 10 of the chambers 12 and 13 may be either curvilinear or rectilinear, but the height of chamber 12 is approximately twice the height of chamber 13 and the sum of the heights of chambers 12 and 13 is at least three times any wall-to-wall horizontal dimension in chambers 12 and 13.
The area of opening 18 in the cell separator '11 is onehalf or less than one-half the area of the bottom vent or opening 17.
The walls 10 are preferably composed of material having a natural resonance frequency beyond audible range, meaning above or below the frequencies that people can hear. Examples of materials which I have used 3,470,976 Patented Oct. 7, 1969 include heavy limestone, a light plastic such as foamed polystyrene, and paper sheet rolled upon itself with a silicate binder.
The speaker is provided with legs 21 or a like support structure to elevate the bottom 16 above the supporting surface to permit movement of air in the bottom vent 17.
A speaker constructed substantially as described and illustrated produces all the objectives of the invention when the speaker unit 19 is energized. The double tuning of chambers 12 and 13 with openings 18 and 17, respectively, gives a much more uniform and flat response curve. Low notes become discernible while high and medium range notes are retained at full strength with low power input, and uniform and pleasing timbre and tone color throughout the audible range.
Without limitation by specific embodiments set forth in this description, the invention is defined by the following claim.
I claim:
1. In a speaker for a high fidelity reproduction of sound:
two chambers alike in two dimensions, the third dimension of one chamber being at least twice the third dimension of the other, the sum of the third dimensions of the two chambers being at least three times any of the two dimensions,
a first opening into said one chamber,
a diaphragm type speaker mounted in said first open- 8, a second smaller opening into said other chamber, and a third opening connecting said chambers and being not more than one-half the area of said second openmg.
References Cited UNITED STATES PATENTS 1,837,755 12/1931 Carlisle et a1. 181-31 2,097,289 10/ 1937 Olson 181-3 1 2,233,459 3/ 1941 Shoup et a1. 18131 2,881,850 4/1959 Bonn 181-31 FOREIGN PATENTS 971,517 7/1950 France. 143,597 9/ 1951 Australia. 1,201,682 7/1959 France.
980,670 1/1965 Great Britain.
STEPHEN J. TOMSKY, Primary Examiner
Claims (1)
1. IN A SPEAKER FOR A HIGH FIDELITY REPRODUCTION OF SOUND: TWO CHAMBERS ALIKE IN TWO DIMENSIONS, THE THIRD DIMENSION OF ONE CHAMBER BEING AT LEAST TWICE THE THIRD DIMENSION OF THE OTHER, THE SUM OF THE THIRD DIMENSIONS OF THE TWO CHAMBERS BEING AT LEAST THREE TIMES ANY OF THE TWO DIMENSIONS, A FIRST OPENING INTO SAID ONE CHAMBER,
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US68972667A | 1967-12-11 | 1967-12-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3470976A true US3470976A (en) | 1969-10-07 |
Family
ID=24769676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US689726A Expired - Lifetime US3470976A (en) | 1967-12-11 | 1967-12-11 | High fidelity speaker |
Country Status (1)
Country | Link |
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US (1) | US3470976A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3102870A1 (en) * | 1981-01-29 | 1982-08-19 | Hans-Joachim 3300 Braunschweig Gieger | HOUSING SPEAKER |
US4591020A (en) * | 1980-02-04 | 1986-05-27 | Hruby Jr John O | Loudspeaker enclosure with isolation of loudspeaker vibration |
US4905788A (en) * | 1986-10-07 | 1990-03-06 | Philippe Lanternier | Electro-acoustic transducers |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1837755A (en) * | 1929-06-22 | 1931-12-22 | Westinghouse Electric & Mfg Co | Translating device |
US2097289A (en) * | 1934-12-20 | 1937-10-26 | Rca Corp | Acoustic apparatus |
US2233459A (en) * | 1937-05-29 | 1941-03-04 | Rca Corp | Acoustic apparatus for motor driven vehicles |
FR971517A (en) * | 1940-09-05 | 1951-01-18 | Csf | Improvements to acoustic damping devices |
US2881850A (en) * | 1955-07-25 | 1959-04-14 | Bonn Leonard | Infinite baffle comprising a spherical shell of foamed plastic |
FR1201682A (en) * | 1958-07-09 | 1960-01-04 | Improvements to sound emitting devices | |
GB980670A (en) * | 1962-09-10 | 1965-01-20 | Philips Electronic Associated | Improvements in or relating to loudspeakers situated in a housing which is provided at its front with a number of appertures |
-
1967
- 1967-12-11 US US689726A patent/US3470976A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1837755A (en) * | 1929-06-22 | 1931-12-22 | Westinghouse Electric & Mfg Co | Translating device |
US2097289A (en) * | 1934-12-20 | 1937-10-26 | Rca Corp | Acoustic apparatus |
US2233459A (en) * | 1937-05-29 | 1941-03-04 | Rca Corp | Acoustic apparatus for motor driven vehicles |
FR971517A (en) * | 1940-09-05 | 1951-01-18 | Csf | Improvements to acoustic damping devices |
US2881850A (en) * | 1955-07-25 | 1959-04-14 | Bonn Leonard | Infinite baffle comprising a spherical shell of foamed plastic |
FR1201682A (en) * | 1958-07-09 | 1960-01-04 | Improvements to sound emitting devices | |
GB980670A (en) * | 1962-09-10 | 1965-01-20 | Philips Electronic Associated | Improvements in or relating to loudspeakers situated in a housing which is provided at its front with a number of appertures |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4591020A (en) * | 1980-02-04 | 1986-05-27 | Hruby Jr John O | Loudspeaker enclosure with isolation of loudspeaker vibration |
DE3102870A1 (en) * | 1981-01-29 | 1982-08-19 | Hans-Joachim 3300 Braunschweig Gieger | HOUSING SPEAKER |
US4905788A (en) * | 1986-10-07 | 1990-03-06 | Philippe Lanternier | Electro-acoustic transducers |
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