GB346646A - Improvements in and relating to sound reproducing devices - Google Patents
Improvements in and relating to sound reproducing devicesInfo
- Publication number
- GB346646A GB346646A GB28620/30A GB2862030A GB346646A GB 346646 A GB346646 A GB 346646A GB 28620/30 A GB28620/30 A GB 28620/30A GB 2862030 A GB2862030 A GB 2862030A GB 346646 A GB346646 A GB 346646A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sections
- diaphragm
- amplifier
- strips
- interconnected
- 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
- H04R19/00—Electrostatic transducers
- H04R19/02—Loudspeakers
Abstract
346,646. Loud-speakers; circuits for electrostatic instruments. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Kellogg, E. W.; 1185, Ardsley Road, Schenectady, New York, U.S.A.) Sept. 24, 1930, No. 28620. Convention date, Sept. 27, 1929. [Class 40 (iv).] An electrostatic loud-speaker, Fig. 1, comprises a diaphragm divided into a number of sections 10 interconnected through inductance elements 13 to the output circuit of an amplifier 11. The dia. phragm sections may co-operate with a rigid perforated electrode or may, as shown, be arranged between two rigid electrodes 14, 17 which are connected through batteries 16, 19 to one of the amplifier circuits which, for convenience, is designated as the grounded terminal. The rigid plate or plates are preferably formed in corresponding sections interconnected through conductors 15, 18. A damping resistance 12 is provided as shown. Fig. 3 shows a modification in which inductance elements 22, 23 are provided between the sections of the plates 14, 17, the diaphragm being either in the form of a continuous conducting sheet or of separate sections interconnected by conductors 21. In order to ensure maintenance of phase opposition, one or more auto-transformers 25 may be connected at intervals between the plates 14, 17, the mid-points of the windings being connected to conductor 27 to which the damping resistances 26 are connected and which is connected both to the cathode of amplifier 11 and to a mid-terminal on the secondary of transformer 24. The provision of inductance elements as shown serves to neutralize the capacitance between the electrodes and such an arrangement allows a much larger total capacity to be employed without overloading the amplifier and ensures that the impedance of the device is the same at all frequencies within the essential audio range. The phase differences between the several sections of the diaphragm may be utilized to produce a desirable distribution of sound. Fig. 4 shows an arrangement which may be employed for producing a beam of sound which spreads horizontally like a fan. The diaphragm is in the form of vertical strips a .. e, a wavelength or more in height and the strips are interconnected as shown so that the output from the amplifier passes through the strips a, b, c, d, and e in that order. Such an arrangement produces a convex wave front but a concave wave front may be produced by reversing the connections. A perfectly symmetrical arrangement can be obtained by connecting the strips on opposite sides of the middle strip in pairs. In addition or as an alternative to the method employing phase-difference effects, the direction of the sound can be controlled by disposing the radiating elements over a curved instead of a plane surface in which case the diaphragm might be given a cylindrical form.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US395686A US1983377A (en) | 1929-09-27 | 1929-09-27 | Production of sound |
Publications (1)
Publication Number | Publication Date |
---|---|
GB346646A true GB346646A (en) | 1931-04-16 |
Family
ID=23564069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28620/30A Expired GB346646A (en) | 1929-09-27 | 1930-09-24 | Improvements in and relating to sound reproducing devices |
Country Status (5)
Country | Link |
---|---|
US (1) | US1983377A (en) |
BE (1) | BE373730A (en) |
DE (1) | DE627679C (en) |
FR (1) | FR704037A (en) |
GB (1) | GB346646A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2520352A (en) * | 2013-11-19 | 2015-05-20 | Mellow Acoustics Ltd | Loudspeakers and loudspeaker drive circuits |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2519810A (en) * | 1947-12-05 | 1950-08-22 | Jose W Acosta | Electrostatic sound reproducer |
US3008013A (en) * | 1954-07-20 | 1961-11-07 | Ferranti Ltd | Electrostatic loudspeakers |
US3160715A (en) * | 1960-11-15 | 1964-12-08 | Gussing Nils Torsten Alson | Electrostatic loudspeakers |
NL281549A (en) * | 1961-09-25 | |||
GB1228775A (en) * | 1967-06-06 | 1971-04-21 | ||
CA866963A (en) * | 1969-12-08 | 1971-03-23 | Dayton Wright Associates Limited | Audio system including electrostatic loudspeaker |
US3892927A (en) * | 1973-09-04 | 1975-07-01 | Theodore Lindenberg | Full range electrostatic loudspeaker for audio frequencies |
AT361555B (en) * | 1979-02-12 | 1981-03-25 | Akg Akustische Kino Geraete | HEADPHONE |
JPS57192195A (en) * | 1981-05-15 | 1982-11-26 | Beard Terry D | Electric-acoustic transducer |
US5054081B1 (en) * | 1985-04-02 | 1994-06-28 | Roger A West | Electrostatic transducer with improved bass response utilizing distributed bass resonance energy |
US6304662B1 (en) | 1998-01-07 | 2001-10-16 | American Technology Corporation | Sonic emitter with foam stator |
US20020076069A1 (en) * | 1998-01-07 | 2002-06-20 | American Technology Corporation | Sonic emitter with foam stator |
US6188772B1 (en) | 1998-01-07 | 2001-02-13 | American Technology Corporation | Electrostatic speaker with foam stator |
US6175636B1 (en) | 1998-06-26 | 2001-01-16 | American Technology Corporation | Electrostatic speaker with moveable diaphragm edges |
US20050100181A1 (en) * | 1998-09-24 | 2005-05-12 | Particle Measuring Systems, Inc. | Parametric transducer having an emitter film |
US6850623B1 (en) | 1999-10-29 | 2005-02-01 | American Technology Corporation | Parametric loudspeaker with improved phase characteristics |
US7142688B2 (en) * | 2001-01-22 | 2006-11-28 | American Technology Corporation | Single-ended planar-magnetic speaker |
WO2005043771A1 (en) | 2003-10-23 | 2005-05-12 | American Technology Corporation | Method of adusting linear parameters of a parametric ultrasonic signal to reduce non-linearities in decoupled audio output waves and system including same |
US8275137B1 (en) | 2007-03-22 | 2012-09-25 | Parametric Sound Corporation | Audio distortion correction for a parametric reproduction system |
US8391514B2 (en) | 2010-06-14 | 2013-03-05 | Parametric Sound Corporation | Parametric transducer systems and related methods |
US8831248B2 (en) * | 2010-08-04 | 2014-09-09 | Nokia Corporation | Apparatus with directivity pattern |
US9036831B2 (en) | 2012-01-10 | 2015-05-19 | Turtle Beach Corporation | Amplification system, carrier tracking systems and related methods for use in parametric sound systems |
US8958580B2 (en) | 2012-04-18 | 2015-02-17 | Turtle Beach Corporation | Parametric transducers and related methods |
US8934650B1 (en) | 2012-07-03 | 2015-01-13 | Turtle Beach Corporation | Low profile parametric transducers and related methods |
US8903104B2 (en) | 2013-04-16 | 2014-12-02 | Turtle Beach Corporation | Video gaming system with ultrasonic speakers |
US8988911B2 (en) | 2013-06-13 | 2015-03-24 | Turtle Beach Corporation | Self-bias emitter circuit |
US9332344B2 (en) | 2013-06-13 | 2016-05-03 | Turtle Beach Corporation | Self-bias emitter circuit |
-
0
- BE BE373730D patent/BE373730A/xx unknown
-
1929
- 1929-09-27 US US395686A patent/US1983377A/en not_active Expired - Lifetime
-
1930
- 1930-09-19 FR FR704037D patent/FR704037A/en not_active Expired
- 1930-09-24 GB GB28620/30A patent/GB346646A/en not_active Expired
- 1930-09-28 DE DE1930627679D patent/DE627679C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2520352A (en) * | 2013-11-19 | 2015-05-20 | Mellow Acoustics Ltd | Loudspeakers and loudspeaker drive circuits |
Also Published As
Publication number | Publication date |
---|---|
US1983377A (en) | 1934-12-04 |
FR704037A (en) | 1931-05-09 |
BE373730A (en) | |
DE627679C (en) | 1936-03-21 |
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