GB780810A - Sound reproducing system and loudspeaker - Google Patents

Sound reproducing system and loudspeaker

Info

Publication number
GB780810A
GB780810A GB27783/54A GB2778354A GB780810A GB 780810 A GB780810 A GB 780810A GB 27783/54 A GB27783/54 A GB 27783/54A GB 2778354 A GB2778354 A GB 2778354A GB 780810 A GB780810 A GB 780810A
Authority
GB
United Kingdom
Prior art keywords
loud
speaker
amplifier
sum
port
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
GB27783/54A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB780810A publication Critical patent/GB780810A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

780,810. Resonators. CARLSSON, S. Sept. 27, 1954 [Oct. 2, 1953], No. 27783/54. Drawings to Specification. Class 13. [Also in Group XXXIX] In a sound reproducing system comprising an amplifier and a loud-speaker of the base-reflex type, the loud-speaker has a volume parameter v less than 1 where v=ac<SP>2</SP>/bd<SP>2</SP> and a=the sum of the masses of the moving members of the loud-speaker mechanism; b= the sum of the mass of the air load on the port and the equivalent mass of the air inside the duct reduced to the port; c=the effective area of the duct; and d=the effective area of the loud-speaker diaphragm, and the total equivalent mechanical series resistance is made larger than that necessary to make Qo=1 if the loud-speaker is fitted in a resonant chamber tuned to the resonant frequency of the loud-speaker and having a volume parameter equal to one. The larger equivalent resistance is obtained by a layer of acoustic resistance material such as rock-wool between the diaphragm and the resonator and/or by feeding the loud-speaker from an amplifier having a low or negative output impedance.
GB27783/54A 1953-10-02 1954-09-27 Sound reproducing system and loudspeaker Expired GB780810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE876153A SE176417C1 (en) 1953-10-02 1953-10-02

Publications (1)

Publication Number Publication Date
GB780810A true GB780810A (en) 1957-08-07

Family

ID=20274964

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27783/54A Expired GB780810A (en) 1953-10-02 1954-09-27 Sound reproducing system and loudspeaker

Country Status (6)

Country Link
US (1) US3037081A (en)
DE (1) DE1110228B (en)
DK (1) DK105927C (en)
FR (1) FR1255304A (en)
GB (1) GB780810A (en)
SE (1) SE176417C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3095467A (en) * 1961-02-13 1963-06-25 Wurlitzer Co Sound generating means

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712411A (en) * 1972-03-17 1973-01-23 D Monroe Loud speaker cabinet
FR2188387B1 (en) * 1972-06-07 1974-12-27 Dehay Daniel
US3952159A (en) * 1973-03-09 1976-04-20 Zenith Radio Corporation Ducted port reflex enclosure
US3978941A (en) * 1975-06-06 1976-09-07 Curt August Siebert Speaker enclosure
DE2552591C3 (en) * 1975-11-24 1984-04-12 Gerhard 5490 Stolberg Wergen Principle of a loudspeaker housing for the low frequency range
JPS5335018U (en) * 1976-08-31 1978-03-28
US4284166A (en) * 1979-04-13 1981-08-18 Gale George A Port devices for bass-reflex speaker enclosures
US4268718A (en) * 1979-09-05 1981-05-19 Harris Corporation Housing acoustical amplifier
US4512434A (en) * 1983-05-10 1985-04-23 Yoo Sin Y Aerodynamic bass-reflex enclosure
JP2701279B2 (en) * 1987-12-28 1998-01-21 ヤマハ株式会社 Sound equipment
JP2605321B2 (en) * 1987-12-28 1997-04-30 ヤマハ株式会社 Sound equipment
US5009281A (en) * 1988-03-10 1991-04-23 Yamaha Corporation Acoustic apparatus
JP2751190B2 (en) * 1988-03-25 1998-05-18 ヤマハ株式会社 Apparatus and method for expanding sound reproduction band
DE68919495T2 (en) * 1988-03-25 1995-07-20 Yamaha Corp Acoustic apparatus.
JPH01254096A (en) * 1988-04-04 1989-10-11 Yamaha Corp Acoustic equipment
US5109422A (en) * 1988-09-28 1992-04-28 Yamaha Corporation Acoustic apparatus
US5280543A (en) * 1989-12-26 1994-01-18 Yamaha Corporation Acoustic apparatus and driving apparatus constituting the same
JP2884651B2 (en) * 1989-12-29 1999-04-19 ヤマハ株式会社 Sound equipment
US5693916A (en) * 1994-06-30 1997-12-02 Von Sprecken; Richard F. Method for designing loud speaker enclosures
US6546298B1 (en) * 1998-06-17 2003-04-08 Micron Technology, Inc. Speaker apparatus and a computer system incorporating same
US6912290B1 (en) * 2000-11-16 2005-06-28 Alpine Electronics, Inc. Speaker unit for low frequency reproduction
US6470088B2 (en) 2000-12-27 2002-10-22 Koninklijke Philips Electronics, N.V. Vented loudspeaker enclosure with limited driver radiation
US20090188745A1 (en) * 2008-01-30 2009-07-30 Paul Wilke Helmholz resonator loudspeaker
US20090296971A1 (en) * 2008-05-29 2009-12-03 Siemens Hearing Instruments, Inc. Hearing Instrument Receiver With Improved Low-Frequency Efficiency
TW201134233A (en) * 2010-03-25 2011-10-01 Zhao-Lang Wang Audio radiation type reflective sound box structure
CA2819561C (en) * 2010-12-16 2019-04-02 Taras Kowalczyszyn Improved housing for containing electronic components therein
GB2501266A (en) * 2012-04-17 2013-10-23 Gp Acoustics Internat Ltd Length of reflex duct for a loudspeaker determined by resonant modes within the loudspeaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217279A (en) * 1938-07-23 1940-10-08 Rca Corp Acoustic apparatus
GB696671A (en) * 1949-09-23 1953-09-09 British Broadcasting Corp Improvements in and relating to loudspeakers
FR1065126A (en) * 1952-10-29 1954-05-20 Elipson Improvements to enclosures containing a sound transmitter, and method for adjusting these enclosures
US2766839A (en) * 1953-03-16 1956-10-16 Research Corp Loudspeaker system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3095467A (en) * 1961-02-13 1963-06-25 Wurlitzer Co Sound generating means

Also Published As

Publication number Publication date
FR1255304A (en) 1961-03-10
US3037081A (en) 1962-05-29
SE176417C1 (en) 1961-09-05
DE1110228B (en) 1961-07-06
DK105927C (en) 1966-11-28

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