BE421801A - - Google Patents
Info
- Publication number
- BE421801A BE421801A BE421801DA BE421801A BE 421801 A BE421801 A BE 421801A BE 421801D A BE421801D A BE 421801DA BE 421801 A BE421801 A BE 421801A
- 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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- 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
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Toys (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US702452A US1631646A (en) | 1924-03-27 | 1924-03-27 | Sound-reproducing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE421801A true BE421801A (de) | 1937-06-30 |
Family
ID=24821277
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE417960D BE417960A (de) | 1924-03-27 | 1936-10-17 | |
| BE421801D BE421801A (de) | 1924-03-27 | 1937-05-28 | |
| BE324881D BE324881A (de) | 1924-03-27 | 1946-09-14 |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE417960D BE417960A (de) | 1924-03-27 | 1936-10-17 |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE324881D BE324881A (de) | 1924-03-27 | 1946-09-14 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1631646A (de) |
| BE (3) | BE417960A (de) |
| FR (3) | FR30476E (de) |
| GB (3) | GB231421A (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2445276A (en) * | 1945-05-04 | 1948-07-13 | Massa Frank | Electrodynamic loudspeaker |
| GB774121A (en) * | 1954-03-18 | 1957-05-08 | Ferranti Ltd | Improvements relating to gramophone pick-ups |
| US6704425B1 (en) * | 1999-11-19 | 2004-03-09 | Virtual Bass Technologies, Llc | System and method to enhance reproduction of sub-bass frequencies |
| FR2955445B1 (fr) | 2010-01-15 | 2013-06-07 | Phl Audio | Transducteur electrodynamique a dome et suspension interne |
| FR2955446B1 (fr) | 2010-01-15 | 2015-06-05 | Phl Audio | Transducteur electrodynamique a dome et suspension flottante |
| FR2955444B1 (fr) | 2010-01-15 | 2012-08-03 | Phl Audio | Systeme de haut-parleur coaxial a chambre de compression |
-
1924
- 1924-03-27 US US702452A patent/US1631646A/en not_active Expired - Lifetime
- 1924-10-07 GB GB23691/24A patent/GB231421A/en not_active Expired
- 1924-10-07 GB GB23690/24A patent/GB231420A/en not_active Expired
-
1925
- 1925-03-26 FR FR30476D patent/FR30476E/fr not_active Expired
- 1925-03-26 FR FR595818D patent/FR595818A/fr not_active Expired
-
1935
- 1935-10-17 GB GB28723/35A patent/GB464418A/en not_active Expired
-
1936
- 1936-10-17 FR FR47708D patent/FR47708E/fr not_active Expired
- 1936-10-17 BE BE417960D patent/BE417960A/xx unknown
-
1937
- 1937-05-28 BE BE421801D patent/BE421801A/xx unknown
-
1946
- 1946-09-14 BE BE324881D patent/BE324881A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR30476E (fr) | 1926-07-17 |
| GB231421A (en) | 1925-09-17 |
| FR595818A (fr) | 1925-10-09 |
| GB231420A (en) | 1925-08-20 |
| GB464418A (en) | 1937-04-19 |
| BE417960A (de) | 1936-11-30 |
| US1631646A (en) | 1927-06-07 |
| FR47708E (fr) | 1937-06-22 |
| BE324881A (de) | 1949-09-30 |