BE425730A - - Google Patents
Info
- Publication number
- BE425730A BE425730A BE425730DA BE425730A BE 425730 A BE425730 A BE 425730A BE 425730D A BE425730D A BE 425730DA BE 425730 A BE425730 A BE 425730A
- 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)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL495240X | 1937-01-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE425730A true BE425730A (da) |
Family
ID=19786727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE425730D BE425730A (da) | 1937-01-14 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE425730A (da) |
| FR (1) | FR832031A (da) |
| GB (1) | GB495240A (da) |
-
0
- BE BE425730D patent/BE425730A/xx unknown
-
1938
- 1938-01-11 GB GB958/38A patent/GB495240A/en not_active Expired
- 1938-01-13 FR FR832031D patent/FR832031A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR832031A (fr) | 1938-09-20 |
| GB495240A (en) | 1938-11-09 |