GB439009A - Improvements in or relating to public address systems - Google Patents

Improvements in or relating to public address systems

Info

Publication number
GB439009A
GB439009A GB7198/35A GB719835A GB439009A GB 439009 A GB439009 A GB 439009A GB 7198/35 A GB7198/35 A GB 7198/35A GB 719835 A GB719835 A GB 719835A GB 439009 A GB439009 A GB 439009A
Authority
GB
United Kingdom
Prior art keywords
sound
loudspeakers
public address
march
loud
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
GB7198/35A
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.)
Telefunken AG
Original Assignee
Telefunken AG
Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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 Telefunken AG, Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken AG
Publication of GB439009A publication Critical patent/GB439009A/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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

439,009. Public address systems; supporting loud-speakers. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE, 12, Hallesches Ufer, Berlin. March 7, 1935, No. 7198. Convention date, March 9, 1934. [Class 40 (iv)] [See also Group XXXVIII] An open air or like public address system for distributing sound over a large area comprises a number of loudspeakers or groups thereof fed from a common source and distributed over the area, the loudspeakers having mushroom-like insertions in the sound channels and being arranged so that sound is propagated radially and downwardly. The area may be split up into imaginary squares or rectangles with a loudspeaker at the corner of each square. Echo effects are substantially avoided. The amplifier may emphasize the higher frequencies. Each loud-speaker 7 may be pivoted to a bracket 8 on a post 6 and be provided with sound directing surfaces 9, 10 spaced by posts 11 the resultant sound channel having a exponential characteristic. The surface 9 is a continuation of the diaphragm. Alternately exponential horn loudspeakers, with reflectors in the horns, may be used.
GB7198/35A 1934-03-09 1935-03-07 Improvements in or relating to public address systems Expired GB439009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE439009X 1934-03-09

Publications (1)

Publication Number Publication Date
GB439009A true GB439009A (en) 1935-11-27

Family

ID=6507242

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7198/35A Expired GB439009A (en) 1934-03-09 1935-03-07 Improvements in or relating to public address systems

Country Status (2)

Country Link
FR (1) FR786027A (en)
GB (1) GB439009A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463845A (en) * 1967-04-06 1969-08-26 Union Camp Corp Injection molding apparatus for making composite paper-plastic lids and method
US4063387A (en) * 1976-12-27 1977-12-20 Mitchell Thomas R Hanging planter pot speaker enclosure
DE3204702A1 (en) * 1982-02-11 1983-08-18 Herwig 4905 Spenge Rabeneck Exponential horn for loudspeaker systems
DE102007019450A1 (en) * 2007-04-10 2008-10-16 Michael Schwahn Omnidirectional radiating and receiving horn has two volume bodies mounted one above other at distance from each other, where lower volume body has tubular horn neck

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463845A (en) * 1967-04-06 1969-08-26 Union Camp Corp Injection molding apparatus for making composite paper-plastic lids and method
US4063387A (en) * 1976-12-27 1977-12-20 Mitchell Thomas R Hanging planter pot speaker enclosure
DE3204702A1 (en) * 1982-02-11 1983-08-18 Herwig 4905 Spenge Rabeneck Exponential horn for loudspeaker systems
DE102007019450A1 (en) * 2007-04-10 2008-10-16 Michael Schwahn Omnidirectional radiating and receiving horn has two volume bodies mounted one above other at distance from each other, where lower volume body has tubular horn neck

Also Published As

Publication number Publication date
FR786027A (en) 1935-08-24

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