NL54237C - - Google Patents
Info
- Publication number
- NL54237C NL54237C NL54237DA NL54237C NL 54237 C NL54237 C NL 54237C NL 54237D A NL54237D A NL 54237DA NL 54237 C NL54237 C NL 54237C
- Authority
- NL
- Netherlands
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
- H04R1/342—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 microphones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US182721A US2210415A (en) | 1937-12-31 | 1937-12-31 | Sound collecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL54237C true NL54237C (xx) |
Family
ID=22669723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL54237D NL54237C (xx) | 1937-12-31 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2210415A (xx) |
| CH (1) | CH208021A (xx) |
| NL (1) | NL54237C (xx) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2485405A (en) * | 1944-04-21 | 1949-10-18 | Stromberg Carlson Co | Dipole microphone |
| US2474384A (en) * | 1944-04-28 | 1949-06-28 | Philco Corp | High-frequency radiant energy absorbing device |
| US2528546A (en) * | 1944-08-04 | 1950-11-07 | Richard H Ranger | Directional sound detection system |
| US2418964A (en) * | 1945-07-09 | 1947-04-15 | David L Arenberg | Electromechanical apparatus |
| US2761137A (en) * | 1946-01-05 | 1956-08-28 | Lester C Van Atta | Solid dielectric waveguide with metal plating |
| US2611867A (en) * | 1946-08-31 | 1952-09-23 | Alford Andrew | Slotted winged cylindrical antenna |
| US2789651A (en) * | 1950-09-05 | 1957-04-23 | Fred B Daniels | Acoustic device |
| US2739659A (en) * | 1950-09-05 | 1956-03-27 | Fred B Daniels | Acoustic device |
| US2750567A (en) * | 1952-03-15 | 1956-06-12 | Rca Corp | Mechanical resonator termination |
| US2861646A (en) * | 1953-07-08 | 1958-11-25 | Bell Telephone Labor Inc | Direction finder utilizing elastic waves of transverse mode |
| US2806544A (en) * | 1953-10-15 | 1957-09-17 | Albert L Witchey | Sound sources for microphone calibration |
| US2808584A (en) * | 1954-01-29 | 1957-10-01 | Bell Telephone Labor Inc | Directional radiator |
| US2856022A (en) * | 1954-08-06 | 1958-10-14 | Electro Sonic Lab Inc | Directional acoustic signal transducer |
| US3054472A (en) * | 1955-01-31 | 1962-09-18 | John V Atanasoff | Sound discriminating device |
| DE1073546B (de) * | 1955-05-26 | 1960-01-21 | Rudolf Gorike Wien Dr | Richtmikrophon mit geringer Erschutterungs- und Windempfind lichkeit |
| US2928490A (en) * | 1957-04-30 | 1960-03-15 | Sennheiser Electronic | Sound directing apparatus |
| US3142034A (en) * | 1959-02-10 | 1964-07-21 | Miguel C Junger | Elastic wave radiator and detector |
| FR1434103A (fr) * | 1959-08-10 | 1966-04-08 | Csf | Dispositif d'excitation d'ondes acoustiques transversales de flexion dans une lame métallique |
| DE1272375B (de) * | 1964-12-01 | 1968-07-11 | Akustische | Interferenzmikrophon mit einem vor der Membran des Wandlersystems angeordneten Rohr |
| JPH0681352B2 (ja) * | 1985-11-19 | 1994-10-12 | 株式会社オ−デイオテクニカ | 狭指向性マイクロホン |
| JP2562295B2 (ja) * | 1985-11-19 | 1996-12-11 | 株式会社 オ−デイオテクニカ | 狭指向性マイクロホン |
| USD444143S1 (en) | 1999-10-08 | 2001-06-26 | Telex Communications, Inc. | Microphone |
| JP1603197S (xx) * | 2017-06-12 | 2018-05-07 |
-
0
- NL NL54237D patent/NL54237C/xx active
-
1937
- 1937-12-31 US US182721A patent/US2210415A/en not_active Expired - Lifetime
-
1938
- 1938-12-31 CH CH208021D patent/CH208021A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH208021A (de) | 1939-12-31 |
| US2210415A (en) | 1940-08-06 |