BE412830A - - Google Patents
Info
- Publication number
- BE412830A BE412830A BE412830DA BE412830A BE 412830 A BE412830 A BE 412830A BE 412830D A BE412830D A BE 412830DA BE 412830 A BE412830 A BE 412830A
- 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
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
-
- 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
-
- 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
- H04R1/38—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 in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US759679A US2126566A (en) | 1934-12-29 | 1934-12-29 | Acoustic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE412830A true BE412830A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Family
ID=25056553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE412830D BE412830A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1934-12-29 |
Country Status (5)
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB552328A (en) * | 1941-12-04 | 1943-04-01 | Reslo Sound Equipment Ltd | Improvements in or relating to loud speakers and the like |
| US2515031A (en) * | 1948-03-31 | 1950-07-11 | Bell Telephone Labor Inc | Microphone having controllable directional response pattern |
| US2702318A (en) * | 1951-01-10 | 1955-02-15 | Astatic Corp | Unidirectional microphone |
| DE1073545B (de) * | 1953-06-02 | 1960-01-21 | Akustische u Kino Gerate Ges mbH, Wien | Dynamisches Rieht mikrophon |
| US3342285A (en) * | 1966-12-19 | 1967-09-19 | Standard Systems Comm Corp | Combination pillow speaker and control unit |
| GB2168875A (en) * | 1984-12-19 | 1986-06-25 | Philips Electronic Associated | Electroacoustic calling device |
-
0
- NL NL45821D patent/NL45821C/xx active
- NL NL43957D patent/NL43957C/xx active
- BE BE412830D patent/BE412830A/xx unknown
-
1934
- 1934-12-29 US US759679A patent/US2126566A/en not_active Expired - Lifetime
-
1935
- 1935-11-15 GB GB31677/35A patent/GB464996A/en not_active Expired
- 1935-12-14 FR FR799518D patent/FR799518A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2126566A (en) | 1938-08-09 |
| GB464996A (en) | 1937-04-29 |
| NL43957C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | |
| NL45821C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | |
| FR799518A (fr) | 1936-06-15 |