BE338918A - - Google Patents
Info
- Publication number
- BE338918A BE338918A BE338918DA BE338918A BE 338918 A BE338918 A BE 338918A BE 338918D A BE338918D A BE 338918DA BE 338918 A BE338918 A BE 338918A
- 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)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4945/26A GB274532A (en) | 1926-02-20 | 1926-02-20 | Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE338918A true BE338918A (de) |
Family
ID=9786809
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE333006D BE333006A (de) | 1926-02-20 | ||
| BE338918D BE338918A (de) | 1926-02-20 |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE333006D BE333006A (de) | 1926-02-20 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1678214A (de) |
| BE (2) | BE338918A (de) |
| FR (2) | FR613219A (de) |
| GB (2) | GB257639A (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2816619A (en) * | 1951-12-04 | 1957-12-17 | John E Karlson | Acoustic transducers |
-
0
- BE BE333006D patent/BE333006A/xx unknown
- BE BE338918D patent/BE338918A/xx unknown
-
1925
- 1925-03-31 GB GB8628/25A patent/GB257639A/en not_active Expired
-
1926
- 1926-02-20 GB GB4945/26A patent/GB274532A/en not_active Expired
- 1926-03-22 FR FR613219D patent/FR613219A/fr not_active Expired
- 1926-12-24 US US156967A patent/US1678214A/en not_active Expired - Lifetime
- 1926-12-27 FR FR626769D patent/FR626769A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE333006A (de) | |
| GB274532A (en) | 1927-07-20 |
| FR613219A (fr) | 1926-11-12 |
| GB257639A (en) | 1926-08-31 |
| US1678214A (en) | 1928-07-24 |
| FR626769A (fr) | 1927-09-19 |