BE493195A - - Google Patents
Info
- Publication number
- BE493195A BE493195A BE493195DA BE493195A BE 493195 A BE493195 A BE 493195A BE 493195D A BE493195D A BE 493195DA BE 493195 A BE493195 A BE 493195A
- 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
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Amplitude Modulation (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2601474X | 1949-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE493195A true BE493195A (fr) |
Family
ID=19874967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE493195D BE493195A (fr) | 1949-01-12 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2601474A (fr) |
| BE (1) | BE493195A (fr) |
| DE (1) | DE803547C (fr) |
| FR (1) | FR1008181A (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2914682A (en) * | 1955-02-10 | 1959-11-24 | Bendix Aviat Corp | Demodulator |
| US2881250A (en) * | 1956-11-02 | 1959-04-07 | Gen Dynamics Corp | Monitoring indication for communication system |
| AT226289B (de) * | 1961-04-17 | 1963-03-11 | Akg Akustische Kino Geraete | Hochfrequenz-Schaltung für einen kapazitiven Elongationswandler |
| US3491299A (en) * | 1967-05-17 | 1970-01-20 | Hewlett Packard Co | Transducer modulation apparatus with transducer operating at other than output frequency |
| US3592967A (en) * | 1968-05-20 | 1971-07-13 | George A Harris | Ultrasonic detector |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB285315A (en) * | 1927-07-22 | 1928-02-16 | Humfrey Andrewes | Improvements in electrical pick-up and amplifying devices for use with gramophones and the like |
| US2211101A (en) * | 1938-08-20 | 1940-08-13 | George C Crangle | Amalgamator |
| US2361658A (en) * | 1942-10-26 | 1944-10-31 | Rca Corp | Sound recording and reproducing system |
| US2357026A (en) * | 1943-10-30 | 1944-08-29 | Scherbatskoy Serge Alexander | Phonograph |
| US2391532A (en) * | 1944-05-15 | 1945-12-25 | Raymond M Wilmotte | Direct current amplifier |
| US2488927A (en) * | 1945-03-10 | 1949-11-22 | Rca Corp | Variable bridge transducer and its combination with a radio receiver |
-
0
- BE BE493195D patent/BE493195A/xx unknown
-
1950
- 1950-01-05 US US136875A patent/US2601474A/en not_active Expired - Lifetime
- 1950-01-10 DE DEN370A patent/DE803547C/de not_active Expired
- 1950-01-10 FR FR1008181D patent/FR1008181A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE803547C (de) | 1951-04-05 |
| US2601474A (en) | 1952-06-24 |
| FR1008181A (fr) | 1952-05-14 |