NL77682C - - Google Patents
Info
- Publication number
- NL77682C NL77682C NL77682DA NL77682C NL 77682 C NL77682 C NL 77682C NL 77682D A NL77682D A NL 77682DA NL 77682 C NL77682 C NL 77682C
- 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
- H04R1/36—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 by using a single aperture of dimensions not greater than the shortest operating wavelength
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB283814X | 1947-09-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
NL77682C true NL77682C (en) |
Family
ID=10274751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL77682D NL77682C (en) | 1947-09-10 |
Country Status (7)
Country | Link |
---|---|
US (1) | US2646851A (en) |
BE (2) | BE522721A (en) |
CH (1) | CH283814A (en) |
DE (1) | DE944860C (en) |
FR (1) | FR971128A (en) |
GB (1) | GB659063A (en) |
NL (1) | NL77682C (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2694462A (en) * | 1951-09-19 | 1954-11-16 | Robbins Frank | Acoustic system for loud-speakers |
US2694463A (en) * | 1952-04-07 | 1954-11-16 | Robbins Frank | Acoustic system for loud-speakers |
US2787332A (en) * | 1952-09-06 | 1957-04-02 | Norman C Fulmer | Loud-speaker system |
DE1130472B (en) * | 1957-11-22 | 1962-05-30 | Philco Corp | Speaker cone |
US3146848A (en) * | 1958-08-25 | 1964-09-01 | John O Fundingsland | Hi-fidelity speaker |
GB1557879A (en) * | 1976-12-03 | 1979-12-12 | Rank Organisation Ltd | Electro acoustic transducers |
US4207963A (en) * | 1978-12-11 | 1980-06-17 | Integrated Sound Systems Inc. | Loudspeaker system |
DE3407980A1 (en) * | 1983-04-20 | 1984-10-25 | Tadashi Tokio/Tokyo Sawafuji | CRYSTAL SOUND GENERATOR |
CA1271247A (en) * | 1987-01-14 | 1990-07-03 | Gerard S. Mindel | Load and dispersion cell for sound |
FR2649572B1 (en) * | 1989-07-07 | 1991-09-20 | Thomson Consumer Electronics | SOUND REPRODUCING DEVICE FOR TELEVISIONS |
GB2425436B (en) * | 2005-04-21 | 2007-06-06 | Martin Audio Ltd | Acoustic loading device for loudspeakers |
US7520368B2 (en) * | 2007-06-08 | 2009-04-21 | Moore Dana A | Horizontally folded reflex-ported bass horn enclosure |
US7513332B2 (en) * | 2007-09-12 | 2009-04-07 | Moore Dana A | Convertible folded horn enclosure with improved compactness |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US272866A (en) * | 1883-02-27 | Speaking-trumpet for receiving-telephones | ||
US1616474A (en) * | 1925-03-05 | 1927-02-08 | Charles F Stehlin | Tone-developing loud speaker |
US1865735A (en) * | 1929-04-01 | 1932-07-05 | Rca Corp | Sound reproducer |
GB404937A (en) * | 1932-07-14 | 1934-01-15 | William Robertson Millar | Improvements in sound-modifying devices for loud speakers or the like |
FR791142A (en) * | 1934-09-06 | 1935-12-04 | Protective device and sound amplifier for loudspeakers of t. s. f. | |
US2214393A (en) * | 1938-09-10 | 1940-09-10 | Ingraham E Co | Acoustical equalizer |
US2373692A (en) * | 1942-10-03 | 1945-04-17 | Ray L Smith | Loud-speaker |
-
0
- BE BE484735D patent/BE484735A/xx unknown
- NL NL77682D patent/NL77682C/xx active
- BE BE522721D patent/BE522721A/xx unknown
-
1947
- 1947-09-10 GB GB24849/47A patent/GB659063A/en not_active Expired
-
1948
- 1948-09-04 US US47824A patent/US2646851A/en not_active Expired - Lifetime
- 1948-09-07 FR FR971128D patent/FR971128A/en not_active Expired
- 1948-09-08 CH CH283814D patent/CH283814A/en unknown
-
1950
- 1950-10-01 DE DEK7280A patent/DE944860C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CH283814A (en) | 1952-06-30 |
BE484735A (en) | |
GB659063A (en) | 1951-10-17 |
BE522721A (en) | |
US2646851A (en) | 1953-07-28 |
DE944860C (en) | 1956-06-28 |
FR971128A (en) | 1951-01-12 |