BE441671A - - Google Patents
Info
- Publication number
- BE441671A BE441671A BE441671DA BE441671A BE 441671 A BE441671 A BE 441671A BE 441671D A BE441671D A BE 441671DA BE 441671 A BE441671 A BE 441671A
- Authority
- BE
- Belgium
Links
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
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US409712A US2971597A (en) | 1941-09-05 | 1941-09-05 | Electro-acoustic devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE441671A true BE441671A (de) |
Family
ID=23621675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE441671D BE441671A (de) | 1941-09-05 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2971597A (de) |
| BE (1) | BE441671A (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3079471A (en) * | 1961-03-01 | 1963-02-26 | Ampex | Loudspeaker |
| US3198890A (en) * | 1961-06-14 | 1965-08-03 | Rosen Alfred H | High fidelity sound reproducer |
| US3632902A (en) * | 1969-02-24 | 1972-01-04 | John J Wahler | Sound reflector-modifier for hearing aid microphones |
| JP2006174077A (ja) * | 2004-12-15 | 2006-06-29 | Sony Corp | スピーカ装置 |
| GB2426405B (en) * | 2005-05-21 | 2008-02-27 | Sonaptic Ltd | Miniature planar acoustic networks |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1841101A (en) * | 1930-03-06 | 1932-01-12 | Bell Telephone Labor Inc | Loud speaker |
| US1901388A (en) * | 1930-04-18 | 1933-03-14 | Rca Corp | Method and apparatus for eliminating the effect of cabinet resonance |
| US1869178A (en) * | 1930-08-15 | 1932-07-26 | Bell Telephone Labor Inc | Sound translating device |
| US1969704A (en) * | 1932-06-03 | 1934-08-07 | D Alton Andre | Acoustic device |
| US2097289A (en) * | 1934-12-20 | 1937-10-26 | Rca Corp | Acoustic apparatus |
| US2065751A (en) * | 1935-12-31 | 1936-12-29 | Rca Corp | Acoustic resistance device |
| US2224919A (en) * | 1937-03-31 | 1940-12-17 | Rca Corp | Loud-speaker |
| US2252846A (en) * | 1938-09-30 | 1941-08-19 | Associated Electric Lab Inc | Acoustic device |
-
0
- BE BE441671D patent/BE441671A/xx unknown
-
1941
- 1941-09-05 US US409712A patent/US2971597A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2971597A (en) | 1961-02-14 |