BE424804A - - Google Patents
Info
- Publication number
- BE424804A BE424804A BE424804DA BE424804A BE 424804 A BE424804 A BE 424804A BE 424804D A BE424804D A BE 424804DA BE 424804 A BE424804 A BE 424804A
- 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
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE487576X | 1936-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE424804A true BE424804A (en:Method) |
Family
ID=6543652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE424804D BE424804A (en:Method) | 1936-11-25 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2174128A (en:Method) |
| BE (1) | BE424804A (en:Method) |
| FR (1) | FR829844A (en:Method) |
| GB (1) | GB487576A (en:Method) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3268030A (en) * | 1965-04-13 | 1966-08-23 | Finn H Magnus | Acoustic system |
| US8351630B2 (en) * | 2008-05-02 | 2013-01-08 | Bose Corporation | Passive directional acoustical radiating |
-
0
- BE BE424804D patent/BE424804A/xx unknown
-
1937
- 1937-11-24 FR FR829844D patent/FR829844A/fr not_active Expired
- 1937-11-25 GB GB32452/37A patent/GB487576A/en not_active Expired
-
1938
- 1938-01-15 US US185110A patent/US2174128A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB487576A (en) | 1938-06-22 |
| US2174128A (en) | 1939-09-26 |
| FR829844A (fr) | 1938-07-07 |