GB274532A - Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatus - Google Patents
Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatusInfo
- Publication number
- GB274532A GB274532A GB4945/26A GB494526A GB274532A GB 274532 A GB274532 A GB 274532A GB 4945/26 A GB4945/26 A GB 4945/26A GB 494526 A GB494526 A GB 494526A GB 274532 A GB274532 A GB 274532A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relating
- reproducing apparatus
- graham
- conduit
- sound producing
- Prior art date
- 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
- H04R1/32—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
- H04R1/345—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 loudspeakers
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)
Abstract
274,532. Graham, M., and Graham, A., (Representatives of Graham, E. A.). Feb. 20, 1926. Addition to 257,639. Loud - speakers.- In a device comprising multiple reflecting surfaces, sound from a conduit 2 is reflected by a concave reflector 1 and is then further reflected and diffused through the outlet 10 by one or more flat reflecting surfaces 4, 5. The axis of the concave surface 1 may, as shown in Fig. 3, be coincident with the axis of the conduit 2 or may be rearwardly inclined as shown in Fig. 7 and in this case the mouth 2<a> of the conduit may be bent as shown. The structure 1, 2, 4, 5 may be provided with top and bottom flat walls, the whole being fitted into a cabinet 8, or, alternatively, the top and bottom walls of the casing may themselves serve as upper and lower walls of the reflecting chamber. The surface 1 may be straight in vertical section or may be part of a surface of revolution. The space between the reflecting chamber and the cabinet 8 may be filled with non-sonorous material such as cotton wool to reduce resonance.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE333006D BE333006A (en) | 1926-02-20 | ||
BE338918D BE338918A (en) | 1926-02-20 | ||
GB8628/25A GB257639A (en) | 1926-02-20 | 1925-03-31 | Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatus |
GB4945/26A GB274532A (en) | 1926-02-20 | 1926-02-20 | Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatus |
FR613219D FR613219A (en) | 1926-02-20 | 1926-03-22 | Improvements in amplifiers and acoustic radiation devices designed for use with telephone receivers, loudspeakers and other sound producing or reproducing devices |
DE1926G0066852 DE522363C (en) | 1925-03-31 | 1926-03-27 | Device for acoustic amplification in connection with loudspeakers |
US156967A US1678214A (en) | 1926-02-20 | 1926-12-24 | Acoustic amplifier and radiator |
FR626769D FR626769A (en) | 1926-02-20 | 1926-12-27 | Improvements to acoustic amplifiers and diffusers suitable for use with loudspeaker telephone receivers and other sound producing or reproducing apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4945/26A GB274532A (en) | 1926-02-20 | 1926-02-20 | Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB274532A true GB274532A (en) | 1927-07-20 |
Family
ID=9786809
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8628/25A Expired GB257639A (en) | 1925-03-31 | 1925-03-31 | Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatus |
GB4945/26A Expired GB274532A (en) | 1925-03-31 | 1926-02-20 | Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8628/25A Expired GB257639A (en) | 1925-03-31 | 1925-03-31 | Improvements in or relating to acoustic amplifiers and radiators suitable for use with loud speaking telephonic receivers and other sound producing or reproducing apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US1678214A (en) |
BE (2) | BE333006A (en) |
FR (2) | FR613219A (en) |
GB (2) | GB257639A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2816619A (en) * | 1951-12-04 | 1957-12-17 | John E Karlson | Acoustic transducers |
-
0
- BE BE338918D patent/BE338918A/xx unknown
- BE BE333006D patent/BE333006A/xx unknown
-
1925
- 1925-03-31 GB GB8628/25A patent/GB257639A/en not_active Expired
-
1926
- 1926-02-20 GB GB4945/26A patent/GB274532A/en not_active Expired
- 1926-03-22 FR FR613219D patent/FR613219A/en not_active Expired
- 1926-12-24 US US156967A patent/US1678214A/en not_active Expired - Lifetime
- 1926-12-27 FR FR626769D patent/FR626769A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB257639A (en) | 1926-08-31 |
BE338918A (en) | |
BE333006A (en) | |
FR626769A (en) | 1927-09-19 |
FR613219A (en) | 1926-11-12 |
US1678214A (en) | 1928-07-24 |
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