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GB452748A - Improvement in reproducers for phonographs - Google Patents

Improvement in reproducers for phonographs

Info

Publication number
GB452748A
GB452748A GB33723/35A GB3372335A GB452748A GB 452748 A GB452748 A GB 452748A GB 33723/35 A GB33723/35 A GB 33723/35A GB 3372335 A GB3372335 A GB 3372335A GB 452748 A GB452748 A GB 452748A
Authority
GB
United Kingdom
Prior art keywords
sound
passage
valve member
outlet
bridgeport
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
GB33723/35A
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.)
Dictaphone Corp
Original Assignee
Dictaphone Corp
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 Dictaphone Corp filed Critical Dictaphone Corp
Publication of GB452748A publication Critical patent/GB452748A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Details Of Valves (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)

Abstract

452,748. Sound-reproducing devices. DICTAPHONE CORPORATION, 375, Howard Avenue, Bridgeport, Connecticut, U.S.A.- (Assignees of Norton, L. D. ; 375, Howard Avenue, Bridgeport, Connecticut, U.S.A.) Dec. 5, 1935, No. 33723. Convention date, April 15. [Classes 13 and 40 (ii)] A sound-modifying device adapted under variable control conditions to permit transmission of sound to a sound-conveying conduit and escape of sound energy to the atmosphere includes a cylindrical valve member 20 mounted in a housing 14 having an inlet 22 from a sound chamber 19 and a laterally-extending sound outlet 25, the member 20 being provided with a sound passage 23 and being adapted to cooperate with a vent 37. As shown, a passage 35 of diminishing depth communicates with the passage 23. Rotation of the valve member to diminish the sound outlet simultaneously diminishes, through the helical surface 38, the outlet of the vent 37. The valve member is located by a stud engaging a groove 33 and its rotation is limited by a stop 34. A spring- pressed plunger 31 bears against the underside of the milled head and an indicating finger 28 is provided.
GB33723/35A 1935-04-15 1935-12-05 Improvement in reproducers for phonographs Expired GB452748A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16437A US2061475A (en) 1935-04-15 1935-04-15 Reproducer for phonographs

Publications (1)

Publication Number Publication Date
GB452748A true GB452748A (en) 1936-08-28

Family

ID=21777126

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33723/35A Expired GB452748A (en) 1935-04-15 1935-12-05 Improvement in reproducers for phonographs

Country Status (4)

Country Link
US (1) US2061475A (en)
DE (1) DE645515C (en)
FR (1) FR799859A (en)
GB (1) GB452748A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505124A (en) * 1950-04-25 Valved stethoscope with logarith
US2541164A (en) * 1946-07-01 1951-02-13 Edison Inc Thomas A Valved selective sound control device

Also Published As

Publication number Publication date
DE645515C (en) 1937-05-28
US2061475A (en) 1936-11-17
FR799859A (en) 1936-06-22

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