GB1016115A - Improvements in or relating to loudspeaker arrangements - Google Patents

Improvements in or relating to loudspeaker arrangements

Info

Publication number
GB1016115A
GB1016115A GB25283/64A GB2528364A GB1016115A GB 1016115 A GB1016115 A GB 1016115A GB 25283/64 A GB25283/64 A GB 25283/64A GB 2528364 A GB2528364 A GB 2528364A GB 1016115 A GB1016115 A GB 1016115A
Authority
GB
United Kingdom
Prior art keywords
transducer
conical member
loud
network
diaphragm
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
GB25283/64A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1016115A publication Critical patent/GB1016115A/en
Expired legal-status Critical Current

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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

1,016,115. Loud-speakers. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. June 18, 1964 [June 21, 1963; Sept. 26, 1963], No. 25283/64. Heading H4J. The drive portion of a loud-speaker diaphragm 1 is attached to the base of a conical member 8, the apex of which is secured to a transducer 6 for producing a voltage output corresponding to the acceleration of the drive portion. The voltage output is fed back degeneratively to an amplifier 4 controlling the loud-speaker. The transducer 6 is preferably of piezo-electric crystal material. The conical member 8 points in the direction of radiated sound and is rigid axially but flexible radially, the latter flexibility preventing transmission of radial forces from the diaphragm 1. At its lower end the conical member 8 is closed by a plate 10 so that substantially no pressure variations are produced in the air surrounding the transducer 6. The output of transducer 6 is applied to a network 7 which integrates oscillations of frequency greater than a frequency equivalent to a wavelength equal to one half the circumference of the diaphragm 1. Network 7 passes lower frequencies unaffected. The output of network .7 is applied to amplifier 4 as a negative feedback voltage which depends substantially linearly on the square root of the sound energy over the entire frequency range. The loudspeaker is of the moving coil type and the ratio of the masses of the transducer 6 and coil 3 is less than 1: #10. The conical member 8 is of aluminium and is connected to earth to avoid induction of ripple voltages in the transducer 6.
GB25283/64A 1963-06-21 1964-06-18 Improvements in or relating to loudspeaker arrangements Expired GB1016115A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL294443 1963-06-21
NL298464 1963-09-26

Publications (1)

Publication Number Publication Date
GB1016115A true GB1016115A (en) 1966-01-05

Family

ID=26641913

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25283/64A Expired GB1016115A (en) 1963-06-21 1964-06-18 Improvements in or relating to loudspeaker arrangements

Country Status (11)

Country Link
US (1) US3334184A (en)
AT (1) AT247437B (en)
BE (1) BE649606A (en)
CH (1) CH434372A (en)
DE (1) DE1268680B (en)
DK (1) DK117642B (en)
ES (1) ES301214A1 (en)
FR (1) FR1401643A (en)
GB (1) GB1016115A (en)
NL (2) NL294443A (en)
SE (1) SE301503B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157914A (en) * 1984-01-25 1985-10-30 Kirksaeter Vertrieb A device for reducing distortion in a loudspeaker
GB2201318A (en) * 1987-02-12 1988-08-24 Udi Group Ltd Electromechanical transducer
GB2260875A (en) * 1991-10-23 1993-04-28 Anthony Best Dynamics Ltd Feedback controlled noise source for acoustic testing

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937887A (en) * 1969-05-15 1976-02-10 Ben O. Key Acoustic power system
NL7308103A (en) * 1973-06-12 1974-12-16
DE2420689C3 (en) * 1974-04-29 1984-09-20 Arndt 7500 Karlsruhe Klingelnberg Method and arrangement for improving the properties of electrodynamic transducers by means of negative motion
DE2658528A1 (en) * 1976-12-23 1978-06-29 Siemens Ag DEVICE FOR GALVANOMAGNETIC POSITION REPORTING FOR ELECTRODYNAMIC DRIVES
US4327250A (en) * 1979-05-03 1982-04-27 Electro Audio Dynamics Inc. Dynamic speaker equalizer
US4809338A (en) * 1985-07-05 1989-02-28 Harman International Industries, Incorporated Automotive sound system
US4759065A (en) * 1986-09-22 1988-07-19 Harman International Industries, Incorporated Automotive sound system
DE3707620A1 (en) * 1987-03-10 1987-10-15 Ultrasonics Schallfeld Messtec Acceleration sensor for dynamic loudspeakers
US5471527A (en) * 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
US5493620A (en) * 1993-12-20 1996-02-20 Pulfrey; Robert E. High fidelity sound reproducing system
US9084051B2 (en) * 2011-02-18 2015-07-14 The Rockefeller University Unidirectional mechanical amplification in a microphone

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE451710A (en) * 1942-08-14
US2860183A (en) * 1954-02-01 1958-11-11 Conrad Ivan Willard Sound reproducing system
US3009991A (en) * 1955-12-01 1961-11-21 Bekey Ivan Sound reproduction system
US2948778A (en) * 1956-05-07 1960-08-09 Warner W Clements Sound reproducing means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157914A (en) * 1984-01-25 1985-10-30 Kirksaeter Vertrieb A device for reducing distortion in a loudspeaker
GB2201318A (en) * 1987-02-12 1988-08-24 Udi Group Ltd Electromechanical transducer
GB2201318B (en) * 1987-02-12 1990-10-24 Udi Group Ltd Electromechanical transducer
GB2260875A (en) * 1991-10-23 1993-04-28 Anthony Best Dynamics Ltd Feedback controlled noise source for acoustic testing
GB2260875B (en) * 1991-10-23 1995-06-28 Anthony Best Dynamics Ltd Noise source

Also Published As

Publication number Publication date
SE301503B (en) 1968-06-10
NL298464A (en)
DK117642B (en) 1970-05-19
BE649606A (en) 1964-12-22
NL294443A (en)
ES301214A1 (en) 1965-01-16
FR1401643A (en) 1965-06-04
DE1268680B (en) 1968-05-22
AT247437B (en) 1966-06-10
US3334184A (en) 1967-08-01
CH434372A (en) 1967-04-30

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