GB496619A - Improvements in loudspeakers - Google Patents

Improvements in loudspeakers

Info

Publication number
GB496619A
GB496619A GB1949/38A GB194938A GB496619A GB 496619 A GB496619 A GB 496619A GB 1949/38 A GB1949/38 A GB 1949/38A GB 194938 A GB194938 A GB 194938A GB 496619 A GB496619 A GB 496619A
Authority
GB
United Kingdom
Prior art keywords
resistance
air
value
loud
jan
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
GB1949/38A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB496619A publication Critical patent/GB496619A/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)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

496,619. Loud-speakers. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAM. PENFABRIEKEN. Jan. 20, 1938, No. 1949. Convention date, Jan. 23, 1937. Drawings to Specification. [Class 40 (iv)] A loud-speaker is provided with a baffle in the form of a casing, part of whose walls allows air to pass, that part of the walls being provided with an acoustic resistance which has a value such that the ratio of the volume speed of the air adjacent the resistance to that of the air adjacent the diaphragm does not exceed 3 /2, volume speed being defined as the product of the speed of the air and the area through which it flows. The value of the acoustic resistance is also such that the peak in the response curve due to resonance of the speaker in the casing is not more than four decibels above the mean value at higher frequencies such as from 400 to 800 cycles per second. The resistance may be formed of one or more layers of flexible material such as fabric or thin paper supported on an apertured rigid plate-like body, the apertures occupying from 20 to 75 per cent of its surface. The resistance material used may have a resistance of from 30 to 150 mechanical ohms per square centimetre.
GB1949/38A 1937-01-23 1938-01-20 Improvements in loudspeakers Expired GB496619A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL496619X 1937-01-23

Publications (1)

Publication Number Publication Date
GB496619A true GB496619A (en) 1938-12-02

Family

ID=19786736

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1949/38A Expired GB496619A (en) 1937-01-23 1938-01-20 Improvements in loudspeakers

Country Status (2)

Country Link
FR (1) FR832551A (en)
GB (1) GB496619A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2766839A (en) * 1953-03-16 1956-10-16 Research Corp Loudspeaker system
US2885024A (en) * 1959-05-05 Loudspeaker cabinets
DE1762237A1 (en) * 1968-05-04 1970-04-23 Amneus Krister Lars Anders Acoustic system especially for low-frequency sound reproduction
EP1061767A1 (en) * 1997-11-19 2000-12-20 Sakuji Fukuda Speaker system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885024A (en) * 1959-05-05 Loudspeaker cabinets
US2766839A (en) * 1953-03-16 1956-10-16 Research Corp Loudspeaker system
DE1762237A1 (en) * 1968-05-04 1970-04-23 Amneus Krister Lars Anders Acoustic system especially for low-frequency sound reproduction
EP1061767A1 (en) * 1997-11-19 2000-12-20 Sakuji Fukuda Speaker system
EP1061767A4 (en) * 1997-11-19 2006-04-05 Sakuji Fukuda Speaker system

Also Published As

Publication number Publication date
FR832551A (en) 1938-09-29

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