BE542142A - - Google Patents
Info
- Publication number
- BE542142A BE542142A BE542142DA BE542142A BE 542142 A BE542142 A BE 542142A BE 542142D A BE542142D A BE 542142DA BE 542142 A BE542142 A BE 542142A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
- H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1138390X | 1954-10-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE542142A true BE542142A (https=) |
Family
ID=19870090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE542142D BE542142A (https=) | 1954-10-18 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE542142A (https=) |
| FR (1) | FR1138390A (https=) |
-
0
- BE BE542142D patent/BE542142A/xx unknown
-
1955
- 1955-10-17 FR FR1138390D patent/FR1138390A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1138390A (fr) | 1957-06-13 |