GB1003150A - Acoustic apparatus - Google Patents

Acoustic apparatus

Info

Publication number
GB1003150A
GB1003150A GB48019/62A GB4801962A GB1003150A GB 1003150 A GB1003150 A GB 1003150A GB 48019/62 A GB48019/62 A GB 48019/62A GB 4801962 A GB4801962 A GB 4801962A GB 1003150 A GB1003150 A GB 1003150A
Authority
GB
United Kingdom
Prior art keywords
coil
cylindrical
loud
yoke
magnet
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
GB48019/62A
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 GB1003150A publication Critical patent/GB1003150A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

1,003,150. Loud-speakers; circuits for magrietic instruments. RADIO CORPORATION OF AMERICA. Dec. 19, 1962 [Dec. 29, 1961], No. 48019/61. Heading H4J. Leakage flux from a moving-coil transducer is utilized for deriving an output voltage corresponding to the motion of the coil. This output voltage may provide a negative feedback signal which limits distortion of the transducer. A loud-speaker 8, Fig. 1, has a cone 10 connected at one end to a voice coil 14. A magnetic field structure 18 includes a cup-shaped yoke 20 of cold rolled steel and a plate 22 having a cylindrical opening 24 forming one face of an air gap 29 for the moving coil 14. The other face is provided by a cylindrical polepiece 28 at one end of an " ALNICO " magnet 26. Centring is provided by a brass clamping ring 30. Leakage flux is picked up by a coil 42 wound on a cylindrical pole member 38 which is secured to a cold rolled steel magnetic structure 36 by soldering, cementing or by a screw (not shown). The top of pole member 38 has a boss 40 of reduced diameter which is secured in a hole 41 in yoke 20 by a force fit, swaging, cementing or soldering. In a modification, Fig. 2, cylindrical magnet 52 is disposed centrally in the yoke 50 by a deformed retaining ring 54. The voice coil 64 is disposed in an air gap defined by the outer periphery of magnet 52 and the inner periphery of cup-shaped yoke 50. Pick-up coil 78 is responsive to leakage flux. Local circuit.-A centre-tapped voice coil 81 of a loud-speaker 80 is driven by an amplifier stage 86 and a push-pull output stage 88. The signal is derived from the detector of a radio receiver and is applied through volume control 84. Pick-up coil 82 (which corresponds to pickup coil 42 or 78) provides a negative feedback signal which is applied across terminals 91, 93. A resistor 90 attenuates the negative feedback signal while a capacitor 92 limits its highfrequency components.
GB48019/62A 1961-12-29 1962-12-19 Acoustic apparatus Expired GB1003150A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US163170A US3118972A (en) 1961-12-29 1961-12-29 Acoustic apparatus

Publications (1)

Publication Number Publication Date
GB1003150A true GB1003150A (en) 1965-09-02

Family

ID=22588786

Family Applications (1)

Application Number Title Priority Date Filing Date
GB48019/62A Expired GB1003150A (en) 1961-12-29 1962-12-19 Acoustic apparatus

Country Status (5)

Country Link
US (1) US3118972A (en)
BE (1) BE626697A (en)
DE (1) DE1183133B (en)
GB (1) GB1003150A (en)
NL (1) NL287305A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3530244A (en) * 1967-02-13 1970-09-22 Martin G Reiffin Motional feedback amplifier systems
US3937887A (en) * 1969-05-15 1976-02-10 Ben O. Key Acoustic power system
US3798374A (en) * 1972-04-03 1974-03-19 Rene Oliveras Sound reproducing system utilizing motional feedback
US3928723A (en) * 1973-07-02 1975-12-23 Kazuo Kai Telephone set with built-in loudspeaker
JPS5379525A (en) * 1976-12-23 1978-07-14 Sony Corp Compound diaphtagm for speakers
US4465905A (en) * 1982-04-28 1984-08-14 International Jensen Incorporated Loudspeaker assembly
US4565905A (en) * 1982-04-28 1986-01-21 International Jensen Incoporated Loudspeaker construction
US5493620A (en) * 1993-12-20 1996-02-20 Pulfrey; Robert E. High fidelity sound reproducing system
US7379558B2 (en) * 2004-12-16 2008-05-27 Jl Audio, Inc. Loudspeaker with integrated spider standoff ring
US8401207B2 (en) 2009-03-31 2013-03-19 Harman International Industries, Incorporated Motional feedback system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1734944A (en) * 1927-10-11 1929-11-05 Celebritone Ltd Sound-amplifying system
US1901331A (en) * 1929-05-15 1933-03-14 Magnavox Co Electrodynamic loud-speaker
DE719459C (en) * 1938-04-26 1942-04-09 Arthur Anders Safety device for vehicle internal combustion engines
DE853298C (en) * 1950-08-01 1952-10-23 Bernhard Philberth Feedback dynamic loudspeaker
DE967169C (en) * 1952-06-20 1957-10-17 Werner Holle Dr Ing Negative coupling arrangement for electrodynamic loudspeakers
US2860183A (en) * 1954-02-01 1958-11-11 Conrad Ivan Willard Sound reproducing system
US2964597A (en) * 1954-12-10 1960-12-13 Rca Corp Loudspeaker magnetic field structure
US2948778A (en) * 1956-05-07 1960-08-09 Warner W Clements Sound reproducing means
US3047661A (en) * 1957-01-18 1962-07-31 Daniel E Winker High fidelity audio system
US3061675A (en) * 1958-09-09 1962-10-30 Texas Instruments Inc Loud speaker improvement
US3057961A (en) * 1959-01-08 1962-10-09 Security First Nat Bank Self-correcting, high fidelity, sound reproducing apparatus

Also Published As

Publication number Publication date
BE626697A (en)
DE1183133B (en) 1964-12-10
NL287305A (en)
US3118972A (en) 1964-01-21

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