US1881830A - Electrical sound reproduction of gramophone and like records - Google Patents

Electrical sound reproduction of gramophone and like records Download PDF

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Publication number
US1881830A
US1881830A US248953A US24895328A US1881830A US 1881830 A US1881830 A US 1881830A US 248953 A US248953 A US 248953A US 24895328 A US24895328 A US 24895328A US 1881830 A US1881830 A US 1881830A
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US
United States
Prior art keywords
condenser
reproducer
gramophone
translator
coil
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 - Lifetime
Application number
US248953A
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English (en)
Inventor
Miller Reginald James
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Application granted granted Critical
Publication of US1881830A publication Critical patent/US1881830A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/02—Transducers using more than one principle simultaneously

Definitions

  • This invention relates to the sound reproduction of gramophone and like records wherein electricalv orelectro-magnetic means associated with a source of potential are actuated directly by.
  • a stylus ' which is in contact with the record, andithe invention has for its object to secure more faithful and better controlled reproduction of the recorded sounds than are obtained hitherto. 1
  • the invention comprises an electrical sound reproducer provided with a variable inductive energy translator having a m0vable;element which carries a plate of a condenser, means being provided for transmitting mechanical. vibrations to said movable element.
  • the invention comprises an arrangement in which the me.- chanical vibrations of a stylus due to its contact with agramophone or like record are converted into. electrical oscillations through the medium of a condenser coupled mechanically to the moving coil of an electromagnetic reproducer whereby both are actuated simultaneously and directly by said stylus as it vibrates.
  • V p the me.- chanical vibrations of a stylus due to its contact with agramophone or like record
  • the condenser' may comprise onevor more stationary insulated conducting plates in proximity to whichmay. be disposed one or more movable insulated conducting plates to rier (not shown) whlch enables the stylus-to 1 which a stylus adapted to contact witha gramophone or other recordimparts move-v ment; said movable plate or platesbeingconnected positively to themoving coil of a known formof electromagnetic reproducer.
  • Fig. 1 is an inverted plan view of the reproducer according to the invention.
  • Fig. 2 is a frontelevation of the partsshown inFig. 1; Fig; 3. is arear elevation thereof partly in section;
  • Fig. 4c is a side elevation thereof and
  • Fig. 5 is a circuit arrangement in which the reproducer may be conveniently arranged to perform its desiredfunctions.
  • the holder 1 forming part of the energy translator, is lPlVOtGCl-lfla bracket 2 carried 7 by a block 8 which issecured to a permanent magnet
  • the holder is preferably of extremely light material so that its inertia is magnet and secured to the block 3Jis a soft iron core 9, about which is supportedthe moving coil 6.
  • a set screw 10 may be .used
  • Adjustment of the movable part with respect tothe fiXed parts may be effected. by means of set screws 16. Springs 17 tendjtoretainv the holder in a normal position against the eifectsofthe received vibrations.
  • The-device issupported ina suitable car-J engage with a gramophone record or the like so that lateral vibrations may be imparted .to. the movablevholder 1. 'These vibrations cause varying currents to be inducedin the coil 6 20 and resistance21'are connectedas shown so that for varying potentials received at b6 177.
  • the tube may serve. as an amplifier to produce amplifiedcurrent in the trans,-.
  • condenser 32 and resistance 31 are provided merely to prevent any line or battery noises from reaching the grid of tube 18..
  • the moving coil 6 is connected through terminals 23.
  • an appropriate receiving instrument is. connected .to terminals26 or when the apparatus is used in a public address system, a further amplifier would be coupled to terminals 26, the loud speaker unit being then connected to the output of this amplifier.
  • I Shunt'resistances 24 and 25 are supplied incthe output circuit of transformer 22 and these have variable tappin'gs by means of a which the relative magnitudes of the currents received from the moving coil 6 and from the 7 tube 18 ma'y be regulated to give most satis factory reproduction in the recelving' circuit coup'led'to terminals 26.
  • the induced current may be set up in a sta tionary coil witha vibratable'core instead of using the moving coilas above described.
  • aJmagnet structure a variable inductive energy translator situated in the field thereof, a coil on said translator, a condensercomprising a plate carriedby said'translator and a plate carried; by said structure, a stylus for transferring mechanical vibrations to said translator, and connecting conductors for transferring the translated mechanical vibrations to an electrical circuit.
  • a permanentmagnet In-an electrical'phonogra'ph reproducer, a permanentmagnet, a moving coil in the field of said magnet, a movable membersupporting said coil, a condenser comprisingv a plate supportedby said movable member and Ii a stationary plate secured to said magnet, a stylus support, and a stylus for transferring mechanical vibrations from a record to said movable member.
  • a magnet'structure a Variable inductive energ-y translator situated in the field thereof, a coil on said translator, a condenser comprising a plate carried by said translator and a plate carried by said structure, a stylus for transferring mechanical vibrations to'said translator, and conductors connecting said condenser tothe input circuit of a vacuum tube amplifier and other conductors connecting said inductive energy translator to an output circuit of said vacuum tube.
  • a system for reproducing sound including a vibration translating device and a vacuum tube amplifier, the device comprising a vibrating body, a variable condenser adapted.
  • V I one of the circuits for generating variations lnductively, and other means associated wlth the body and the other circuit for generating variations capacitatively.
  • An electric phonograph reproducer coma variable capacitative energy translator, a vibratable actuating member common to the translators, and a stylus for transferringv mechanical vibrations to the member.
  • An electrical phonograph reproducer comprising two energy translators for translating mechanical vibrationsinto electrical variations, one translator being more sensitive to the lower frequencies Whilst the other 7 is more sensitive to the higher frequencies of plate supported in spaced relation thereto by the said vibratory element, and an electromagnetic unit comprising a coil and an armature supported by said vibratory element in the field of the coil.
  • a vibratory element means carried thereby for supporting a phonographic stylus, a capacity unit comprising a condenser plate fixedly supported in juxtaposition to said vibratory element and a companion condenser plate supported in spaced relation thereto by said vibratory element, and an electromagnetic unit comprising a fixed magnet, a coil arranged between the pole pieces of the magnet, and an armature supported by said vibratory element in the field of the coil and between the pole pieces of themagnet.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Recording Measured Values (AREA)
US248953A 1927-01-24 1928-01-23 Electrical sound reproduction of gramophone and like records Expired - Lifetime US1881830A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2048/27A GB289165A (en) 1927-01-24 1927-01-24 Improvements relating to the electrical sound reproduction of gramophone and like records

Publications (1)

Publication Number Publication Date
US1881830A true US1881830A (en) 1932-10-11

Family

ID=9732686

Family Applications (1)

Application Number Title Priority Date Filing Date
US248953A Expired - Lifetime US1881830A (en) 1927-01-24 1928-01-23 Electrical sound reproduction of gramophone and like records

Country Status (4)

Country Link
US (1) US1881830A (de)
DE (1) DE532382C (de)
FR (1) FR644705A (de)
GB (1) GB289165A (de)

Also Published As

Publication number Publication date
GB289165A (en) 1928-04-24
DE532382C (de) 1931-08-27
FR644705A (fr) 1928-10-12

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