BE409777A - - Google Patents
Info
- Publication number
- BE409777A BE409777A BE409777DA BE409777A BE 409777 A BE409777 A BE 409777A BE 409777D A BE409777D A BE 409777DA BE 409777 A BE409777 A BE 409777A
- 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
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US729759A US2106813A (en) | 1934-06-09 | 1934-06-09 | Acoustic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE409777A true BE409777A (en) |
Family
ID=24932491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE409777D BE409777A (en) | 1934-06-09 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2106813A (en) |
| BE (1) | BE409777A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2806544A (en) * | 1953-10-15 | 1957-09-17 | Albert L Witchey | Sound sources for microphone calibration |
| US4057124A (en) * | 1975-12-30 | 1977-11-08 | Braden Harold C | Sound suppressor |
| AT385384B (en) * | 1986-07-28 | 1988-03-25 | Stastny & Schroegendorfer Ges | SPEAKER COVER |
| US5038459A (en) * | 1987-03-04 | 1991-08-13 | Hosiden Electronics Co., Ltd. | Method of fabricating the diaphragm unit of a condenser microphone by electron beam welding |
| US5400413A (en) * | 1992-10-09 | 1995-03-21 | Dana Innovations | Pre-formed speaker grille cloth |
| US7946379B1 (en) * | 2006-07-03 | 2011-05-24 | Michael Frenchik | Filter assembly |
| US20090010472A1 (en) * | 2007-07-02 | 2009-01-08 | Chin-Kuo Chiu | Acoustical grille free from spit moisture maintains frequency to keep realistic and natural sounds |
| USD878339S1 (en) * | 2018-01-09 | 2020-03-17 | Ching-Wen Chen | Microphone |
| USD909347S1 (en) * | 2019-09-20 | 2021-02-02 | Apple Inc. | Earphone |
| USD901459S1 (en) * | 2020-07-15 | 2020-11-10 | Yang Zhao | Microphone pop filter |
| USD991229S1 (en) * | 2021-09-22 | 2023-07-04 | Shenzhen Lanque Shangpin Trading Co., Ltd. | Microphone set |
-
0
- BE BE409777D patent/BE409777A/xx unknown
-
1934
- 1934-06-09 US US729759A patent/US2106813A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2106813A (en) | 1938-02-01 |