US2210477A - Loudspeaker arrangement - Google Patents

Loudspeaker arrangement Download PDF

Info

Publication number
US2210477A
US2210477A US240650A US24065038A US2210477A US 2210477 A US2210477 A US 2210477A US 240650 A US240650 A US 240650A US 24065038 A US24065038 A US 24065038A US 2210477 A US2210477 A US 2210477A
Authority
US
United States
Prior art keywords
loudspeaker
ground
sound
diaphragm
loudspeaker arrangement
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 - Lifetime
Application number
US240650A
Inventor
Benecke Heinrich
Bialk Leo
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
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
Priority to DE207880X priority Critical
Application filed by Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2210477A publication Critical patent/US2210477A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34Arrangements 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
    • H04R1/345Arrangements 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

Description

ug @9 E94@ H, ENECKE ET AL, ZDZQ?? LOUDSPEAKER ARRANGEMENT Filed NOV. le. 1933 INVENTORS HElA/R/CH BEA/ECKE LE /ALK ATTORNEY Patented Aug. 6, 1940 LOUDSPEAKER ARRANGEMENT l'Heinrich Benecke and Leo Bialk, Berlin, Germany, assignors to Telefunken Gesellschaft fr Drahtlose Telegraphie in. lo. Il., Berlin, Germany, a corporation of Germany Application November 16, 1938, Serial No. 240,650 In Germany November 1li, 1937 l Claim.

For outdoor entertainment and public address systems, and also for enclosed rooms or spaces, it is often desirable to have the loudspeaker mounted in some concealed place. According to the invention, arrangements are made so that the sound issues from underneath the licor or ground. The loudspeakers therefore are mounted below the floor or the ground. In order that the range or area supplied with sound may be larger in reference to the vertical axis, and in order that, in reference to the horizontal axis, the higher pitches may be reproduced with better quality, the axis of the loudspeaker to the horizontal line is preferably inclined at an acute angle. This plan moreover oiers the advantage that the loudspeakers Will not be impaired in their operation by rain and splashing water and are protected against the entry of foreign bodies. In the vicinity of the loudspeaker the bottom (ground) plank must be shut and protrude somewhat above the loudspeaker in order to prevent the entrance of dirt. At a little greater distance from the loudspeaker, a grating is provided, built so ruggedly that it will stand the Weight of a person standing thereon. Of course, this grating must also be so proportioned that the acoustic properties of the loudspeaker will not be influenced at all or only slightly. It will be understood that drain ducts to carry away rain and other water Will have to be provided.

In the appended drawing Figs. 1, 2 and 3 show exemplified embodiments of the present invention. Fitted into the ground is a box i in which is accommodated the loudspeaker 2. The loudspeaker divides the box into two parts, care having to be taken so that the sound waves issuing from the front of the diaphragm will not have a chance to communicate With the wave given off from the posterior face thereof. In order to avoid space resonances, it is recommendable to drape the space posteriorly of the diaphragm, as known in the art, with felt 3 or by packing it with cotton or the like. For carrying off rain water, a drain hole 4 is provided. The horn-like construction as shown oiers the advantage that the use of the device is made essentially independent of the acoustic properties of the posterior space, provided it is not of unduly limited dimensions. Owing to the fact that the loudspeaker is mounted in the enclosure a little distance away from the grating 5 part 6 of the top cover plate will protect the loudspeaker from soiling.

Instead of disposing the loudspeaker arrangement ilush with the ground as shown in the drawing, it is also possible to place such loudspeaker into enclosures or casings having a tortoise-like cover raised but slightly above the ground of the kind serving for traic regulation in the streets. The loudspeakers could also be set into bases which also are raised but little above the ground. This has the advantage that a listener cannot stand right on top of the speaker.

In the exemplified embodiment of Fig. 1, the loudspeaker is mounted so that its axis presents an inclination to the horizontal. It is, of course, also feasible to mount the loudspeaker so that its axis is parallel to the horizontal as shown in Fig. 2. The reference numerals in Fig. 2 correspond to those in Fig. 1. But the arrangement Fig. 2 comprises additional sound duct walls or baliies 'l the eil'ect of which is that the sound radiated 01T from the loudspeaker 2 issues at an acute angle.

Apart from the modes of mounting of loudspeakers shown in the drawing, recourse could be had also to other forms of mounting. For instance, the loudspeaker axis could present any other angle in reference to the horizontal, provided that care is taken so that the acoustic waves radiated from the loudspeaker are made to issue at an acute angle to the horizontal, and this is done in the embodiment Fig. 2, where the axis is parallel, by the aid of baiiles.

Another embodiment of this invention is to install a mushroom type loudspeaker, that is, a loudspeaker with non-directional characteristic into the ground as shown in Fig. 3. In the surface of the ground, for instance, in the lawn of a parade ground or else in the floor of a room, is an opening lll adapted to accommodate the non-directional loudspeaker i l. On. top the mouth of the loudspeaker is covered by the mushroom-shaped inserted part l2; the outlet i3 for the sound is shut by means of a cover if! of truncated-cone shape and having sound apertures. The mouth i3 itself is protected against the entrance of water, foreign bodies, etc., by means oi a screen i5. The loudspeaker system is indicated at i6, and the diaphragm at il.

From the loudspeaker i6, a flexible connectingk cable I8 is brought to the socket i@ which is preferably mounted iixed in the ground. A drain hole 2Q is provided here just as in Figs. l and 2.

As regards the arrangement of the drain holes in the embodiments Figs. 1 to 3 it is to be noted that it is recommendable to dispose the loudspeakers a few centimeters above these drain holes in order that the speaker may not be damaged by possibly occurring clogging of the drains.

What We claim is: A subterranean loudspeaker installation com- 5 prising a housing disposed underneath the surface that part having the outlet portion in the upper Wall andthe back of the diaphragm radiating sound Waves into the other part Which is completely enclosed, the latter part being lined With felt padding for absorbing the sound Waves from -the back of the diaphragm, and a plurality of upwardly curved spaced members serving as directional baille means extending between the front of the diaphragm and the outlet portion of thehousing for guiding the sound Waves radiJ 10 ated from the front of the diaphragm.

HEINRICH BENECKE. LEO BIALK.

US240650A 1937-11-10 1938-11-16 Loudspeaker arrangement Expired - Lifetime US2210477A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE207880X 1937-11-10

Publications (1)

Publication Number Publication Date
US2210477A true US2210477A (en) 1940-08-06

Family

ID=5793936

Family Applications (1)

Application Number Title Priority Date Filing Date
US240650A Expired - Lifetime US2210477A (en) 1937-11-10 1938-11-16 Loudspeaker arrangement

Country Status (5)

Country Link
US (1) US2210477A (en)
BE (1) BE430974A (en)
CH (1) CH207880A (en)
GB (1) GB508458A (en)
NL (1) NL52281C (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2689016A (en) * 1953-04-14 1954-09-14 Henry C Lang Sound reproducing system
US3043912A (en) * 1957-07-10 1962-07-10 Laney William J De Intercom for automobiles
US3045064A (en) * 1959-06-01 1962-07-17 Margaret H Sellers Apparatus for transmitting sound from a baseball field
US3065816A (en) * 1958-03-10 1962-11-27 Rangertone Electronics Corp Stereophonic sound distributor
US3080012A (en) * 1958-09-26 1963-03-05 Columbia Broadcasting Syst Inc Stereophonic loudspeaker arrays
US3105113A (en) * 1960-07-15 1963-09-24 Rca Corp Stereophonic loudspeaker system
US3557324A (en) * 1967-04-28 1971-01-19 Yoshiro Nakamatsu Television receiver having means for causing sound to emanate from picture plane
US3590941A (en) * 1969-10-10 1971-07-06 Arvin Ind Inc Speaker enclosure
US3642091A (en) * 1968-10-09 1972-02-15 Pioneer Electronic Corp Underground acoustic device
US3674108A (en) * 1970-10-29 1972-07-04 David L Beatty Outdoor speaker enclosure
US3679023A (en) * 1968-08-06 1972-07-25 John C Rankin Loudspeaker enclosure
US3964571A (en) * 1975-04-01 1976-06-22 Peter Garland Snell Acoustic system
US4949386A (en) * 1988-05-23 1990-08-14 Hill Amel L Speaker system
US5033577A (en) * 1988-12-06 1991-07-23 Bose Corporation Room sound reproducing
US8873788B1 (en) * 2010-08-30 2014-10-28 Jeffery James Coombs In-ground audio sub woofer and method of installation
US10240796B1 (en) * 2016-05-20 2019-03-26 Beckwell Companies, LLC Fire pit insert assembly
US10484790B1 (en) * 2018-10-23 2019-11-19 Hyundai Motor Company Speaker device for vehicle
US10499128B2 (en) * 2018-04-20 2019-12-03 Sonos, Inc. Playback devices having waveguides with drainage features

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5173942A (en) * 1986-09-13 1992-12-22 Sharp Kabushiki Kaisha Audio system operable in directional and non-directional modes
JPH0724439B2 (en) * 1986-09-13 1995-03-15 シャープ株式会社 Oh - Deio equipment

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2689016A (en) * 1953-04-14 1954-09-14 Henry C Lang Sound reproducing system
US3043912A (en) * 1957-07-10 1962-07-10 Laney William J De Intercom for automobiles
US3065816A (en) * 1958-03-10 1962-11-27 Rangertone Electronics Corp Stereophonic sound distributor
US3080012A (en) * 1958-09-26 1963-03-05 Columbia Broadcasting Syst Inc Stereophonic loudspeaker arrays
US3045064A (en) * 1959-06-01 1962-07-17 Margaret H Sellers Apparatus for transmitting sound from a baseball field
US3105113A (en) * 1960-07-15 1963-09-24 Rca Corp Stereophonic loudspeaker system
US3557324A (en) * 1967-04-28 1971-01-19 Yoshiro Nakamatsu Television receiver having means for causing sound to emanate from picture plane
US3679023A (en) * 1968-08-06 1972-07-25 John C Rankin Loudspeaker enclosure
US3642091A (en) * 1968-10-09 1972-02-15 Pioneer Electronic Corp Underground acoustic device
US3590941A (en) * 1969-10-10 1971-07-06 Arvin Ind Inc Speaker enclosure
US3674108A (en) * 1970-10-29 1972-07-04 David L Beatty Outdoor speaker enclosure
US3964571A (en) * 1975-04-01 1976-06-22 Peter Garland Snell Acoustic system
US4949386A (en) * 1988-05-23 1990-08-14 Hill Amel L Speaker system
US5033577A (en) * 1988-12-06 1991-07-23 Bose Corporation Room sound reproducing
US8873788B1 (en) * 2010-08-30 2014-10-28 Jeffery James Coombs In-ground audio sub woofer and method of installation
US10240796B1 (en) * 2016-05-20 2019-03-26 Beckwell Companies, LLC Fire pit insert assembly
US10499128B2 (en) * 2018-04-20 2019-12-03 Sonos, Inc. Playback devices having waveguides with drainage features
US10484790B1 (en) * 2018-10-23 2019-11-19 Hyundai Motor Company Speaker device for vehicle

Also Published As

Publication number Publication date
BE430974A (en)
NL52281C (en)
GB508458A (en) 1939-06-30
CH207880A (en) 1939-12-15

Similar Documents

Publication Publication Date Title
US3477540A (en) Speaker system
Conover Fighting noise with noise
US4620317A (en) Tabletop speaker assembly
US5967354A (en) Fully adjustable electrical receptacle housing
US4750832A (en) Video projector mount
US4884655A (en) Tower-type speaker cabinet with pivoted plural speaker subassembly
EP1179968A2 (en) Structure around a speaker unit
US4296280A (en) Wall mounted speaker system
US2619021A (en) Ventilator fan mounting
US4281224A (en) Grille covered speaker assembly construction for compact automobiles and the like
US4006311A (en) Stereophonic sound reproducing apparatus
US6858802B2 (en) Extension ring for electrical junction box installations
EP0909111A2 (en) Omni-directional speaker system
US5073936A (en) Stereophonic microphone system
US4580654A (en) Portable sound speaker system
CN104717586B (en) Phase plug and acoustic lens for direct radiator type loudspeaker
US4128738A (en) Compact transmission line loudspeaker system
US7463746B2 (en) Narrow opening electroacoustical transducing
US4319088A (en) Method and apparatus for masking sound
US4179585A (en) Variable ratio full range direct-reflected pyramid inclined loudspeaker
CA2345336A1 (en) Method and device for developing a virtual speaker distant from the sound source
US4256922A (en) Stereophonic effect speaker arrangement
US4063387A (en) Hanging planter pot speaker enclosure
US3727004A (en) Loudspeaker system
US8218805B2 (en) Wireless speaker system for use with ceiling fans