GB464996A - Improvements in or relating to sound translating devices - Google Patents
Improvements in or relating to sound translating devicesInfo
- Publication number
- GB464996A GB464996A GB31677/35A GB3167735A GB464996A GB 464996 A GB464996 A GB 464996A GB 31677/35 A GB31677/35 A GB 31677/35A GB 3167735 A GB3167735 A GB 3167735A GB 464996 A GB464996 A GB 464996A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chambers
- casing
- passage
- sound
- partition
- 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
- 238000005192 partition Methods 0.000 abstract 4
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 238000013016 damping Methods 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
-
- 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
-
- 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
- H04R1/38—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 in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
464,996. Acoustic wave filters. STANDARD TELEPHONES & CABLES, Ltd. Nov. 15, 1935, No. 31677. Convention date, Dec. 29, 1934. [Class 13] [Also in Group XXXIX] A sound-reproducing device as claimed in Specification 382,268 and in which an acoustic path, provided between the two sides of the diaphragm, has acoustic mass and stiffness so proportioned that the sound waves are reinforced at low frequency, comprises a case having an open end closed by the diaphragm, a partition member dividing the space behind the sound-translating unit into two chambers and formed with at least one passage connecting the chambers, and a tubular channel constituting a restricted sound-wave passage for enhancing the low-frequency response of the device and directly connecting one of the said chambers with the atmosphere outside the case. As shown in Fig. 1, the chambers 25, 26 are connected by a tapered hole 67 in the partition 27 and the rear compartment 26 communicates with the outside air by means of a coiled tube 72 associated with an apertured portion 76 formed in the rear wall 71 of the casing. In a modification, Fig. 6, the passage in the partition may be closed by resilient pad 124 operated by a button 138 outside the casing. The front chamber 102 has a radial passage 121 opening into a circumferential channel 116 with which is associated a ring 117 having an aperture of area equal to that of the passage 121 and of the cross-section of the channel 116. By rotation of the ring 117, the length of the channel 116 may be varied. In an alternative arrangement, Figs. 9, 10 (not shown), a ring similar to the ring 117, but preferably fixed, is mounted within the casing and the outlet to the atmosphere is formed in the casing itself. In a further modification, Figs. 13, 14 (not shown), the partition between the chambers is formed with a number of apertures covered on one side by a strip of acoustic damping material and variably obstructed on the other side by a slidable member operated from the outside of the casing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US759679A US2126566A (en) | 1934-12-29 | 1934-12-29 | Acoustic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB464996A true GB464996A (en) | 1937-04-29 |
Family
ID=25056553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31677/35A Expired GB464996A (en) | 1934-12-29 | 1935-11-15 | Improvements in or relating to sound translating devices |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2126566A (en) |
| BE (1) | BE412830A (en) |
| FR (1) | FR799518A (en) |
| GB (1) | GB464996A (en) |
| NL (2) | NL45821C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB552328A (en) * | 1941-12-04 | 1943-04-01 | Reslo Sound Equipment Ltd | Improvements in or relating to loud speakers and the like |
| US2515031A (en) * | 1948-03-31 | 1950-07-11 | Bell Telephone Labor Inc | Microphone having controllable directional response pattern |
| US2702318A (en) * | 1951-01-10 | 1955-02-15 | Astatic Corp | Unidirectional microphone |
| DE1073545B (en) * | 1953-06-02 | 1960-01-21 | Akustische u Kino Gerate Ges mbH, Wien | Dynamic directional microphone |
| US3342285A (en) * | 1966-12-19 | 1967-09-19 | Standard Systems Comm Corp | Combination pillow speaker and control unit |
| GB2168875A (en) * | 1984-12-19 | 1986-06-25 | Philips Electronic Associated | Electroacoustic calling device |
-
0
- BE BE412830D patent/BE412830A/xx unknown
- NL NL43957D patent/NL43957C/xx active
- NL NL45821D patent/NL45821C/xx active
-
1934
- 1934-12-29 US US759679A patent/US2126566A/en not_active Expired - Lifetime
-
1935
- 1935-11-15 GB GB31677/35A patent/GB464996A/en not_active Expired
- 1935-12-14 FR FR799518D patent/FR799518A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE412830A (en) | |
| NL45821C (en) | |
| FR799518A (en) | 1936-06-15 |
| NL43957C (en) | |
| US2126566A (en) | 1938-08-09 |
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