FR2133693B1 - - Google Patents
Info
- Publication number
- FR2133693B1 FR2133693B1 FR7213007A FR7213007A FR2133693B1 FR 2133693 B1 FR2133693 B1 FR 2133693B1 FR 7213007 A FR7213007 A FR 7213007A FR 7213007 A FR7213007 A FR 7213007A FR 2133693 B1 FR2133693 B1 FR 2133693B1
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
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)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7105001A NL7105001A (en) | 1971-04-14 | 1971-04-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2133693A1 FR2133693A1 (en) | 1972-12-01 |
FR2133693B1 true FR2133693B1 (en) | 1979-01-05 |
Family
ID=19812916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7213007A Expired FR2133693B1 (en) | 1971-04-14 | 1972-04-13 |
Country Status (5)
Country | Link |
---|---|
US (1) | US3790724A (en) |
AT (1) | AT325692B (en) |
FR (1) | FR2133693B1 (en) |
GB (1) | GB1369377A (en) |
NL (1) | NL7105001A (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2236374C3 (en) * | 1972-07-25 | 1975-01-16 | Josef Wilhelm 8725 Arnstein Manger | Electroacoustic transducer system |
US4013846A (en) * | 1975-08-28 | 1977-03-22 | Minnesota Mining And Manufacturing Company | Piston loudspeaker |
GB2134745B (en) * | 1983-02-04 | 1986-10-22 | Standard Telephones Cables Ltd | Electro acoustic tranducer |
AT382281B (en) * | 1984-11-15 | 1987-02-10 | Akg Akustische Kino Geraete | CIRCULAR RING MEMBRANE, IN PARTICULAR FOR MICROPHONES AND HEADPHONES |
US4752963A (en) * | 1985-06-12 | 1988-06-21 | Kabushiki Kaisha Kenwood | Electroacoustic converter having a recessed step on the center pole |
DE3700594A1 (en) * | 1986-01-16 | 1987-07-23 | Akg Akustische Kino Geraete | PRESSURE GRADIENT RECEIVER |
WO1999045742A1 (en) * | 1998-03-03 | 1999-09-10 | Koninklijke Philips Electronics N.V. | A loudspeaker featuring acoustic friction to damp resonance |
JP2002152885A (en) * | 2000-11-14 | 2002-05-24 | Sony Corp | Speaker system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB812348A (en) * | 1954-06-03 | 1959-04-22 | Leonard Walter Murkham | Improvements in and relating to electro magnetic transducers |
US1941073A (en) * | 1931-08-12 | 1933-12-26 | Bell Telephone Labor Inc | Pneumatic sound reproducer |
DE971704C (en) * | 1953-06-25 | 1959-03-19 | Carl Ludwig Lehner | Electroacoustic converter for telephone purposes |
US3240883A (en) * | 1961-05-25 | 1966-03-15 | Shure Bros | Microphone |
GB1037244A (en) * | 1964-02-20 | 1966-07-27 | Standard Telephones Cables Ltd | Improvements in or relating to moving coil transducers |
US3581015A (en) * | 1966-12-28 | 1971-05-25 | Aiwa Co | Dynamic microphone |
-
1971
- 1971-04-14 NL NL7105001A patent/NL7105001A/xx unknown
-
1972
- 1972-03-31 US US00240012A patent/US3790724A/en not_active Expired - Lifetime
- 1972-04-11 AT AT312972A patent/AT325692B/en not_active IP Right Cessation
- 1972-04-11 GB GB1661072A patent/GB1369377A/en not_active Expired
- 1972-04-13 FR FR7213007A patent/FR2133693B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2217051B2 (en) | 1976-09-02 |
GB1369377A (en) | 1974-10-09 |
US3790724A (en) | 1974-02-05 |
NL7105001A (en) | 1972-10-17 |
ATA312972A (en) | 1975-01-15 |
AT325692B (en) | 1975-11-10 |
FR2133693A1 (en) | 1972-12-01 |
DE2217051A1 (en) | 1972-10-26 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |