GB447205A - Improvements in or relating to the recording and reproduction of impulses such as those of audio frequency - Google Patents

Improvements in or relating to the recording and reproduction of impulses such as those of audio frequency

Info

Publication number
GB447205A
GB447205A GB34342/34A GB3434234A GB447205A GB 447205 A GB447205 A GB 447205A GB 34342/34 A GB34342/34 A GB 34342/34A GB 3434234 A GB3434234 A GB 3434234A GB 447205 A GB447205 A GB 447205A
Authority
GB
United Kingdom
Prior art keywords
damping
instrument
turbulence
diaphragm
response
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
Application number
GB34342/34A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB447205A publication Critical patent/GB447205A/en
Expired legal-status Critical Current

Links

Landscapes

  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

447,205. Diaphragms. RADIO CORPORATION OF AMERICA, 30, Rockefeller Plaza, New York, U.S.A. Nov. 29, 1934, No. 34342. Convention date, Dec. 28, 1933. [Class 40 iv] Sound reproducing or recording devices are provided with means for producing " turbulence damping," i.e. the damping produced by causing a turbulent motion in a fluid such as air. Such damping is proportional to the cube of the air velocity and so, in the neighbourhood of the resonance frequency of the instrument concerned, reduces the response to high level vibrations to a much greater extent than that to low level vibrations. The Figure shows an instrument in which a mirror is controlled by a diaphragm 20 for making an optical record. The space behind the diaphragm is, in order to produce " turbulence damping," closed by a thin perforated sheet 25. A similar instrument not forming part of the invention has a comparatively thick porous back instead of the sheet 25. This arrangement gives an approximation to viscous damping. Reference is made to a cutter in which the response at the upper and lower ends of the spectrum depends primarily on mass and stiffness respectively and in the region 2000 ... 4000 depends on turbulence damping. No constructional details are given.
GB34342/34A 1933-12-28 1934-11-29 Improvements in or relating to the recording and reproduction of impulses such as those of audio frequency Expired GB447205A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US447205XA 1933-12-28 1933-12-28

Publications (1)

Publication Number Publication Date
GB447205A true GB447205A (en) 1936-05-14

Family

ID=21933955

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34342/34A Expired GB447205A (en) 1933-12-28 1934-11-29 Improvements in or relating to the recording and reproduction of impulses such as those of audio frequency

Country Status (1)

Country Link
GB (1) GB447205A (en)

Similar Documents

Publication Publication Date Title
US1988250A (en) Loud speaker and method of propagating sound
US2429470A (en) Loud-speaker with pressure-equalized chamber system enclosing flux gap
GB382268A (en) Improvements in sound translating devices, particularly loud-speakers and telephone or like transmitters
US2761912A (en) Sound translating apparatus
GB447205A (en) Improvements in or relating to the recording and reproduction of impulses such as those of audio frequency
US2071828A (en) Loudspeaker, sound reproducing instrument, and the like
US2085194A (en) Recording and reproduction of impulses
US2563452A (en) Lotjd-speakek unit
US1623561A (en) Acoustic horn
GB445765A (en) Improved method and device for the reproduction of sound
GB403843A (en) Improvements in or relating to resonating apparatus associated with loud-speakers and sound diffusers
GB460994A (en) Improvements in electro-dynamic sound reproducers
GB256677A (en) Improvements in and relating to the reproduction of sound
US2165236A (en) Method of and apparatus for recording and reproducing of sound
US1696807A (en) Diaphragm for telephone instruments
Herriott et al. High speed motion pictures of the vocal cords
GB432811A (en) An improved method of, and apparatus for, recording sound
US1845986A (en) Method and apparatus for translating sound
US1644788A (en) Acoustic device
US1819183A (en) Loud speaker device
US1735862A (en) Push-pull-actuated radial resonator
GB319408A (en) Improvements in or relating to sound reproducing devices
US1225203A (en) Means for utilizing electrically-transmitted impulses.
US1768766A (en) Sound-damping device
US1076643A (en) Disk talking-machine.