US2610694A - Stereophonic reproduction apparatus - Google Patents

Stereophonic reproduction apparatus Download PDF

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Publication number
US2610694A
US2610694A US660324A US66032446A US2610694A US 2610694 A US2610694 A US 2610694A US 660324 A US660324 A US 660324A US 66032446 A US66032446 A US 66032446A US 2610694 A US2610694 A US 2610694A
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United States
Prior art keywords
sound
loudspeakers
loudspeaker
reproduction apparatus
stereophonic
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Expired - Lifetime
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US660324A
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English (en)
Inventor
Boer Kornelis De
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • 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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein

Definitions

  • This invention relates tollstereophonic' reproducing apparatus in which at least'two spaced loudspeakers are used. Such apparatus may be used, for example, in radio orphonograph sets.
  • the spacing between the loudspeakers is known to be very important in producing a stereophonic effect. The larger the spacing is,'the greater'is the effect. It may also be desirable to vary the spacing in view of variationsin size of the original sound source. If, for example, the sound of a large band or orchestra is being'reproduced, it is desirable to increase the volume of the sound image during reproduction over that'of asmall orchestra.
  • Prior attempts in achieving this goal in stereophonic reproducing systems include the mounting of two loudspeakers on extension panels, whichwere preferably fitted on the front wall, to vary the spacing between the loudspeakers in accord with the desired stereophonic effect.
  • One of the objects of the present invention is to achieve the aforesaid goal in stereophonic reproduction apparatus having a variable stereophonic effect.
  • at least one of the loudspeakers is housed in one of the side walls of the cabinet so as to be stationary.
  • a hinged panel which covers the loudspeaker but which is swingable to open positions to reflect the sound oscillations coming from this loudspeaker primarily in about the same direction as that in which the sound is emanated from the other loudspeakers housed in the cabinet.
  • This panel may be simply hinged to the rear of the side wall of the apparatus so as to be movable with respect to the loudspeaker mounted on said side wall.
  • the hinged panels used preferably have sound distributing elements fitted to their inner sides so that correct reproduction is ensured in all directions, because, as is well known, even the high tones, which are radiated by the loudspeaker at a smaller angle than the low tones, are distributed in this case.
  • Fig.1 l is a diagrammatic plan representation of an embodiment of'the invention by way Of'BX- ampleyand 'Fig. 2 is a perspective view of a fragment of one of the panels shown 1 tofshow the sound distributing elements more clearly.
  • reference numeral designates a radio'receiver set in which. is enclosed, stereophonic reproducing apparatus as shown diagrammatically by legend.
  • LoudspeakersLi and L2 which are high frequency loudspeakers for the high tones, arefitted in the two .side walls.
  • Low frequency loudspeaker L3 is, housed in the'front wall and reproduces frequencies, for examplegbelow 300 cycles per second.
  • the side walls canv be covered by hinged panels K1 and K2. .In the out-position, it is preferred that. the. angle between the'panel and the side wall does not exceed and in any event, it should be-less than
  • Thesepanels K1 and vK22 reflectthe sound emanating from loudspeakers L1 and L2 respectively, primarily'in' about the same direction as that in which the sound is emanated from loudspeakerLa.
  • the side panelsKi and'Kz are preferably provided with sound distributing elements 4, such as small cones and thelike as more clearly illustrated in Figure 2 for example.
  • stereophonic reproduction apparatus comprising a cabinet structure having a front wall and side walls, a plurality of loudspeakers, at least one of said loudspeakers being for high frequency sound production and housed in one of said side walls so as to be stationary, a covering for said one of said loudspeakers comprising a hinged panel attached to said cabinet structure, at least another of said loudspeakers being for low frequency sound production and housed in said front wall, said hinged panel being swingable to a position in front of said one of said loudspeakers for reflecting the sound oscillations coming therefrom primarily in about the same direction as that in which the sound is radiated from said another of said loudspeakers, said hinged panel being provided on its inner side with sound distributing elements.
  • stereophonic reproduction apparatus comprising a cabinet structure having a front wall tion, a hinged panel attached to each of said 7 side walls and positioned to substantially cover one of said high frequency sound production loudspeakers housed therein, said hinged panels being movable to positions for reflecting the sound oscillations coming from said high frequency sound production loudspeakers primarily in about the same direction as that in which the sound is radiated from said low frequency sound production loudspeaker, each of said hinged panels being provided on its inner side with sound distributing elements.
  • Stereophonic reproduction apparatus comprising a cabinet structure having a front wall and side walls, reproduction apparatushoused in said cabinet structure, a plurality of loudspeakers, at least one of said loudspeakers being for low frequency sound reproduction and housed in said front wall for directing sound in one direction, means separately connecting said low frequency loudspeaker to said reproduction apparatus to form therewith a stereophonic component channel, at least another of said loudspeakers being for high frequency sound production and housed in one'of the side walls so as to be stationary and for directing sound at an angle to said first direction, other means separately connecting said high frequency loudspeaker to said reproduction apparatus to form therewith another stereophonic component channel, a covering for said high frequency loudspeaker comprising a sound reflecting hinged panel attached to said side wall of said cabinet structure in which one of said loudspeakers is located, said hinged panel being swingable to a position in front of said one of said loudspeakers for reflecting the sound oscillations coming therefrom primarily in about the same direction as that in which the sound is radiated
  • Stereophonic reproduction apparatus con prising a cabinet structure having a front and a pair of side walls, a loudspeaker housed in each one of said walls, the loudspeaker housed in said front Wall being for low frequency sound production and directing sound in a first direction, the loudspeakers housed in said side walls being for high frequency sound production and each direct- 4 ing sound at an angle to said first direction, a sound deflecting hinged panel attached to each of said side walls and positioned to substantially cover the loudspeakers housed therein, said hinged panel being movable to positions for refleeting the sound oscillations coming from said high frequency sound production loudspeakers primarily in about the same direction as that in which the sound is radiated from said low frequency sound production loudspeaker.
  • Stereophonic reproduction apparatus comprising a cabinet having a front wall and side Walls, a reproduction apparatus housed in said cabinet, at least one loudspeaker for high frequency sound production and housed in one of said walls so as to direct sound in a first direction, at least another loudspeaker for low frequency sound production and housed in another of said walls so as to direct sound at an angle to said first direction, means separately connecting each of said loudspeakers to said reproduction apparatus to form therewith a pair of stereophonic component channels, a sound reflecting hinged panel attached to that side wallon which one of said loudspeakers has been secured and positioned to substantially cover said loudspeaker, said hinged panel being swingable to a position in front of said'loudspeaker in the side wall for reflecting the sound oscillations coming therefrom primarily in about thesame direction as that in which the sound is radiated from the other loudspeaker.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
US660324A 1944-05-30 1946-04-08 Stereophonic reproduction apparatus Expired - Lifetime US2610694A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL248861X 1944-05-30

Publications (1)

Publication Number Publication Date
US2610694A true US2610694A (en) 1952-09-16

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Family Applications (1)

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US660324A Expired - Lifetime US2610694A (en) 1944-05-30 1946-04-08 Stereophonic reproduction apparatus

Country Status (6)

Country Link
US (1) US2610694A (enrdf_load_stackoverflow)
BE (1) BE464536A (enrdf_load_stackoverflow)
CH (1) CH248861A (enrdf_load_stackoverflow)
DE (1) DE813605C (enrdf_load_stackoverflow)
FR (1) FR929705A (enrdf_load_stackoverflow)
GB (1) GB622401A (enrdf_load_stackoverflow)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701025A (en) * 1952-02-05 1955-02-01 George H Kuhl High fidelity sound system
US2710662A (en) * 1948-12-23 1955-06-14 Armour Res Found Sound projection system
DE943598C (de) * 1954-02-21 1956-05-24 Max Grundig Rundfunk- oder Nachrichtengeraet mit raeumlich wirkender Tonwiedergabe
US2768702A (en) * 1952-02-07 1956-10-30 Lowry Charles Ariel Larmer Sound reproducing systems
US2777902A (en) * 1952-08-19 1957-01-15 Columbia Broadcasting Syst Inc Phonograph cabinet
US2814354A (en) * 1954-04-19 1957-11-26 Ampex Loud-speaker assembly and system
DE1086749B (de) * 1958-02-07 1960-08-11 Grammophon Ges M B H Deutsche Stereofonische Wiedergabevorrichtung
US2956129A (en) * 1954-08-31 1960-10-11 Rca Corp Stereophonic sound for drive-in theatres
US2979149A (en) * 1953-10-02 1961-04-11 Carlsson Stig Loudspeaker apparatus
US3052758A (en) * 1959-02-25 1962-09-04 Trix Electrical Co Ltd Column speakers suitable for use in public address systems
US3099183A (en) * 1960-06-09 1963-07-30 Edwin H Alles Mute and reflector for musical wind instruments
US3153120A (en) * 1961-06-05 1964-10-13 Automatic Canteen Co Stereophonic sound reproduction system
US3166147A (en) * 1962-05-07 1965-01-19 Walter B Udell Loudspeaker system
US3198007A (en) * 1961-05-23 1965-08-03 Jerry B Overton Acoustic testing chamber
US3582553A (en) * 1967-12-04 1971-06-01 Bose Corp Loudspeaker system
US3679023A (en) * 1968-08-06 1972-07-25 John C Rankin Loudspeaker enclosure
US4332986A (en) * 1980-01-31 1982-06-01 Image Acoustics, Inc. Speaker system employing passive radiator
USRE31228E (en) * 1967-12-04 1983-05-03 Bose Corporation Loudspeaker system
US20040131202A1 (en) * 2003-01-06 2004-07-08 David Cranfill Stereo imaging manifold and method for use in a portable electronic device
US20110188661A1 (en) * 2009-12-02 2011-08-04 Lutz Ehrig Flat Panel Loudspeakers
FR2969894A1 (fr) * 2010-12-23 2012-06-29 Texte Edouard Durand Enceinte acoustique a au moins deux haut-parleurs
CN114651450A (zh) * 2019-09-09 2022-06-21 L-声学科技公司 一种大受控宽带的方向性扩音装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105905A (en) * 1990-05-07 1992-04-21 Rice Winston C Co-linear loudspeaker system
DE19639159C2 (de) * 1996-09-24 1998-09-03 Heinz Juergen Dipl In Augustin Lautsprecherbox

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1915954A (en) * 1932-08-25 1933-06-27 Sparkswithington Co Loud speaker system
US1932343A (en) * 1932-05-04 1933-10-24 Philadelphia Storage Battery Radio loud speaker cabinet
GB404937A (en) * 1932-07-14 1934-01-15 William Robertson Millar Improvements in sound-modifying devices for loud speakers or the like
FR758706A (fr) * 1933-07-21 1934-01-22 Perfectionnement aux reproducteurs de sons
FR790599A (fr) * 1935-05-28 1935-11-23 P A Zahlen Perfectionnement à l'acoustique des machines parlantes
US2114680A (en) * 1934-12-24 1938-04-19 Rca Corp System for the reproduction of sound
US2217279A (en) * 1938-07-23 1940-10-08 Rca Corp Acoustic apparatus
GB551364A (en) * 1942-01-14 1943-02-18 Philips Nv Improvements in or relating to devices for the stereophonic transmission and reproduction of sound
US2410413A (en) * 1943-02-10 1946-11-05 Albert B Hurley Acoustic tile

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932343A (en) * 1932-05-04 1933-10-24 Philadelphia Storage Battery Radio loud speaker cabinet
GB404937A (en) * 1932-07-14 1934-01-15 William Robertson Millar Improvements in sound-modifying devices for loud speakers or the like
US1915954A (en) * 1932-08-25 1933-06-27 Sparkswithington Co Loud speaker system
FR758706A (fr) * 1933-07-21 1934-01-22 Perfectionnement aux reproducteurs de sons
US2114680A (en) * 1934-12-24 1938-04-19 Rca Corp System for the reproduction of sound
FR790599A (fr) * 1935-05-28 1935-11-23 P A Zahlen Perfectionnement à l'acoustique des machines parlantes
US2217279A (en) * 1938-07-23 1940-10-08 Rca Corp Acoustic apparatus
GB551364A (en) * 1942-01-14 1943-02-18 Philips Nv Improvements in or relating to devices for the stereophonic transmission and reproduction of sound
US2410413A (en) * 1943-02-10 1946-11-05 Albert B Hurley Acoustic tile

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2710662A (en) * 1948-12-23 1955-06-14 Armour Res Found Sound projection system
US2701025A (en) * 1952-02-05 1955-02-01 George H Kuhl High fidelity sound system
US2768702A (en) * 1952-02-07 1956-10-30 Lowry Charles Ariel Larmer Sound reproducing systems
US2777902A (en) * 1952-08-19 1957-01-15 Columbia Broadcasting Syst Inc Phonograph cabinet
US2979149A (en) * 1953-10-02 1961-04-11 Carlsson Stig Loudspeaker apparatus
DE943598C (de) * 1954-02-21 1956-05-24 Max Grundig Rundfunk- oder Nachrichtengeraet mit raeumlich wirkender Tonwiedergabe
US2814354A (en) * 1954-04-19 1957-11-26 Ampex Loud-speaker assembly and system
US2956129A (en) * 1954-08-31 1960-10-11 Rca Corp Stereophonic sound for drive-in theatres
DE1086749B (de) * 1958-02-07 1960-08-11 Grammophon Ges M B H Deutsche Stereofonische Wiedergabevorrichtung
US3052758A (en) * 1959-02-25 1962-09-04 Trix Electrical Co Ltd Column speakers suitable for use in public address systems
US3099183A (en) * 1960-06-09 1963-07-30 Edwin H Alles Mute and reflector for musical wind instruments
US3198007A (en) * 1961-05-23 1965-08-03 Jerry B Overton Acoustic testing chamber
US3153120A (en) * 1961-06-05 1964-10-13 Automatic Canteen Co Stereophonic sound reproduction system
US3166147A (en) * 1962-05-07 1965-01-19 Walter B Udell Loudspeaker system
US3582553A (en) * 1967-12-04 1971-06-01 Bose Corp Loudspeaker system
USRE31228E (en) * 1967-12-04 1983-05-03 Bose Corporation Loudspeaker system
US3679023A (en) * 1968-08-06 1972-07-25 John C Rankin Loudspeaker enclosure
US4332986A (en) * 1980-01-31 1982-06-01 Image Acoustics, Inc. Speaker system employing passive radiator
US20040131202A1 (en) * 2003-01-06 2004-07-08 David Cranfill Stereo imaging manifold and method for use in a portable electronic device
US7483543B2 (en) 2003-01-06 2009-01-27 Motorola, Inc. Stereo imaging manifold and method for use in a portable electronic device
US20110188661A1 (en) * 2009-12-02 2011-08-04 Lutz Ehrig Flat Panel Loudspeakers
US8798302B2 (en) * 2009-12-02 2014-08-05 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Flat panel loudspeakers
FR2969894A1 (fr) * 2010-12-23 2012-06-29 Texte Edouard Durand Enceinte acoustique a au moins deux haut-parleurs
CN114651450A (zh) * 2019-09-09 2022-06-21 L-声学科技公司 一种大受控宽带的方向性扩音装置
US20230053097A1 (en) * 2019-09-09 2023-02-16 L-Acoustics Sound diffusion device with controlled broadband directivity
US12207047B2 (en) * 2019-09-09 2025-01-21 L-Acoustics Sound diffusion device with controlled broadband directivity
CN114651450B (zh) * 2019-09-09 2025-04-04 L-声学科技公司 一种大受控宽带的方向性扩音装置

Also Published As

Publication number Publication date
CH248861A (de) 1947-05-31
GB622401A (en) 1949-05-02
DE813605C (de) 1951-09-13
FR929705A (fr) 1948-01-06
BE464536A (enrdf_load_stackoverflow) 1946-10-12

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