US2547447A - Apparatus for stereophonic sound reproduction - Google Patents

Apparatus for stereophonic sound reproduction Download PDF

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Publication number
US2547447A
US2547447A US618333A US61833345A US2547447A US 2547447 A US2547447 A US 2547447A US 618333 A US618333 A US 618333A US 61833345 A US61833345 A US 61833345A US 2547447 A US2547447 A US 2547447A
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US
United States
Prior art keywords
sound
reproduction
cabinet
loudspeakers
stereophonic
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
US618333A
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English (en)
Inventor
Boer Kornelis De
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2547447A publication Critical patent/US2547447A/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • 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

Definitions

  • both the microphones and the loudspeakers should be arranged so that they are relatively spaced from each other in order that there may be a distinctly perceptible difference of volume and/or time in the sound produced in each of the loudspeakers. If on the reproduction side a correct representation of the record or picked up sound is to be obtained, the conditions under which the record or picked up sound was obtained have to be taken into account as much as possible. That is to say the position of the microphones relatively to the original source or sources of sound must be simulated as much as possible at the loudspeaker end.
  • the position and the extensiveness of the audience and also the distance of the audience from the loudspeakers will be important so as to ensure that the audience receives a correct impression of the stereophonic effect.
  • the apparatus for stereophonic sound reproduction is characterized by a cabinet in which the electric part of the apparatus is housed, and by V Ill apparatus renders it necessary the loudspeakers may be given a larger relative spacing.
  • V Ill apparatus renders it necessary the loudspeakers may be given a larger relative spacing.
  • they are adjustably fitted on the cabinet so as to allow their relative spacing to exceed the largest dimension of the cabinet.
  • the construction hereinbefore described may be applied to sound reproduction apparatus of differing kinds, such as wireless sets for the reception and reproduction of two channels which jointly form a stereophonic sound transmission.
  • the invention is also applicable to grainophone reproduction apparatus either in conjunction with a projected image or not.
  • Figure l is a front perspective view of an apparatus for stereophonic reproduction of sound embodying the present invention.
  • Figure 2 is a rear perspective view of the apparatus shown in Figure 1 but on a reduced scale.
  • This wireless set comprises two channels for electric transmission of the received modulated carrier wave or Waves to the loudspeakers.
  • these channels may either be united in the high-frequency part of the apparatus or not.
  • the low-frequency part is separated and comprises two individual channels for the supply of at least two loudspeakers 4 and 5 spaced some distance apart.
  • the cabinet is provided on the front side with two slidable panels 2 and 3 which, in the form of sliding doors, are adapted to close the front side of the cabinet.
  • the rear side of the cabinet is closed by the usual panel it having the con ventional aperture 12 therein.
  • the thickness of the panels is such as to enable each of them to accommodate a loudspeaker 4 and 5 respectively.
  • These loudspeakers are connected to the electric part 9 of the wireless set by means of flexible leads H.
  • the panels 2 and 3 and the loudspeakers 4 and 5 housed therein may be pushed apart in order to correlate the spacing between the loudspeakers to the conditions during recording and reproduction. With a usual cabinet length of 80 cms.
  • the centre lines of the loudspeakers 4 and 5 are about 40 cms. spaced apart when the panels are completely pushed in. This arrangement suffices for the reproduction of music from a trio or of one or two speakers from a small studio when at the same time the audience is at distance of no more than one meter from the wireless set.
  • the two panels 2 and 3 With the same conditions on the recording side and the presence of a plurality of auditors distributed about a large living room so that the distance from the loudspeakrs caincrease to 4 meters the two panels 2 and 3 have each to be pushed out at least half.
  • the two panels should always be pushed apart as far as possible so that the spacing between the loudspeakersis about 1.28 m.
  • a tuningknob l and a tuning dial 6 for the control or the wireless set. panels 2 and 3 consequently also serve as closing doors for the cabinet of the set.
  • the panels 2 and 3 are also edge screens for the loudspeakers i and 5.
  • the panels are therefore not entirely closed at their rear sides, but coated with a partially sound damping substance such for example as a perforated card-board plate or a coarse-meshed fabric.
  • the surface of these panels is important in connection with the frequency characteristic of the loudspeaker, particularly for the reproduction of the low tones.
  • the loudspeakers d and 5 are only intended for the reproduction of the frequency band above 250 cycles/sec.
  • the cabinet of the set comprises one loudspeaker 8 which is only supplied from one of channels of the stereophonic sound transmission. This is not detrimental to the stereophonic effect because due to the absence of the directional efi'ect the sound waves below 250 cycles/sec. practically do not assist in the stereophonic effect.
  • the cabinet has itself suffi- The 1:
  • An acoustic apparatus for the stereophonic reproduction of sound comprising a cabinet having electrical sound reproducing means therein, and at least two loudspeakers each movably supported by a separable supporting means mounted at the front of said cabinet, said electrical means having at least two different sound channels each carrying a diiferent sound signal, each said loudspeaker having electrical connection with a diiferent one of said channels respectively, and each of said separate supporting means comprising a slidable closure means for said front of said cabinet constructed and arranged to permit laterally adjustable movement of said loudspeakers towards and away from each other during operation of said apparatus.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
US618333A 1942-03-18 1945-09-24 Apparatus for stereophonic sound reproduction Expired - Lifetime US2547447A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL232943X 1942-03-18

Publications (1)

Publication Number Publication Date
US2547447A true US2547447A (en) 1951-04-03

Family

ID=19780082

Family Applications (1)

Application Number Title Priority Date Filing Date
US618333A Expired - Lifetime US2547447A (en) 1942-03-18 1945-09-24 Apparatus for stereophonic sound reproduction

Country Status (6)

Country Link
US (1) US2547447A (enrdf_load_stackoverflow)
BE (1) BE449683A (enrdf_load_stackoverflow)
CH (1) CH232943A (enrdf_load_stackoverflow)
DE (1) DE972491C (enrdf_load_stackoverflow)
FR (1) FR892422A (enrdf_load_stackoverflow)
NL (1) NL60178C (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086078A (en) * 1958-10-06 1963-04-16 Sharma Devendra Nath Sound reproducing systems for television, radio and the like
US3090462A (en) * 1959-03-26 1963-05-21 Motorola Inc Cabinet for sound reproducing equipment
US3135835A (en) * 1957-11-22 1964-06-02 Steidinger Arthur Portable sound instrument
US3180447A (en) * 1959-03-26 1965-04-27 Motorola Inc Cabinet for sound reproducing equipment
US3340956A (en) * 1965-11-01 1967-09-12 Motorola Inc Sound reproduction apparatus
US3680936A (en) * 1967-12-18 1972-08-01 Peter Heinz Backhaus Stereo sound reproduction system
US5119421A (en) * 1990-07-03 1992-06-02 Reime Paul W Stereo system cabinet with loudspeaker door assembly
US5228652A (en) * 1990-11-26 1993-07-20 Ponticelli Robert J Panel assembly for use in variously mounting radio equipment in vehicles
US5675426A (en) * 1995-02-10 1997-10-07 Samsung Electronics Co., Ltd. Television receiver with doors for its display screen which doors contain loudspeakers
USD390218S (en) 1996-05-16 1998-02-03 Samsung Electronics Co., Ltd. Television receiver/computer monitor having hinged doors
US6587082B1 (en) * 1997-06-10 2003-07-01 Stacey Y. Moore Multiple access computer monitoring system
US20040135476A1 (en) * 2003-01-07 2004-07-15 Alan Gillengerten Audio visual system and apparatus
US20050146251A1 (en) * 2003-09-17 2005-07-07 Alan Gillengerten Audio visual system
US20120321120A1 (en) * 2011-06-14 2012-12-20 Samsung Electronics Co., Ltd. Speaker apparatus
US8970795B2 (en) 2013-04-26 2015-03-03 Alain Lemieux Sliding panels system for hiding a flat screen TV
GB2525767A (en) * 2014-05-01 2015-11-04 Hugh Brogan Speaker device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908349A1 (de) * 1979-03-03 1980-09-04 Braun Ag Stereo-kompaktgeraet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1813542A (en) * 1929-04-01 1931-07-07 Owens Dev Corp Talking picture vehicle
US1855147A (en) * 1929-01-11 1932-04-19 Jones W Bartlett Distortion in sound transmission
US1978456A (en) * 1932-05-04 1934-10-30 Wired Radio Inc Binaural address system
US2126929A (en) * 1936-05-15 1938-08-16 Bell Telephone Labor Inc Sound reproducing system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE573360C (de) * 1933-03-30 Radioschall Lothar Schmidt Sprechmaschine
GB297308A (en) * 1927-09-17 1928-10-04 Forest Phonofilms Ltd De Improvements in or connected with sound reproducing
FR712546A (fr) * 1930-06-18 1931-10-03 Perfectionnements à l'enregistrement et à l'audition de films sonores
US2172209A (en) * 1935-08-05 1939-09-05 Jacobo J Laub Process for the transmission of sounds and for their reception in the proper volume
US2102144A (en) * 1936-02-11 1937-12-14 Wired Radio Inc Binaural program system
US2137032A (en) * 1936-09-30 1938-11-15 Bell Telephone Labor Inc Sound reproducing system
DE682647C (de) * 1937-03-31 1939-10-19 Dr Erich Fischer Anordnung von Schallstrahlern im Zuhoererraum beim Ferndirigieren
DE728471C (de) * 1937-05-06 1942-11-27 Klangfilm G M B H Lautsprecheranordnung zur UEbertragung stereoakustischer Darbietungen
US2179840A (en) * 1938-05-03 1939-11-14 Frida Bucky Loudspeaker arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1855147A (en) * 1929-01-11 1932-04-19 Jones W Bartlett Distortion in sound transmission
US1813542A (en) * 1929-04-01 1931-07-07 Owens Dev Corp Talking picture vehicle
US1978456A (en) * 1932-05-04 1934-10-30 Wired Radio Inc Binaural address system
US2126929A (en) * 1936-05-15 1938-08-16 Bell Telephone Labor Inc Sound reproducing system

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3135835A (en) * 1957-11-22 1964-06-02 Steidinger Arthur Portable sound instrument
US3086078A (en) * 1958-10-06 1963-04-16 Sharma Devendra Nath Sound reproducing systems for television, radio and the like
US3090462A (en) * 1959-03-26 1963-05-21 Motorola Inc Cabinet for sound reproducing equipment
US3180447A (en) * 1959-03-26 1965-04-27 Motorola Inc Cabinet for sound reproducing equipment
US3340956A (en) * 1965-11-01 1967-09-12 Motorola Inc Sound reproduction apparatus
US3680936A (en) * 1967-12-18 1972-08-01 Peter Heinz Backhaus Stereo sound reproduction system
US5119421A (en) * 1990-07-03 1992-06-02 Reime Paul W Stereo system cabinet with loudspeaker door assembly
US5228652A (en) * 1990-11-26 1993-07-20 Ponticelli Robert J Panel assembly for use in variously mounting radio equipment in vehicles
US6005642A (en) * 1995-02-10 1999-12-21 Samsung Electronics Co., Ltd. Television receiver with doors for its display screen which doors contain loudspeakers
US5675426A (en) * 1995-02-10 1997-10-07 Samsung Electronics Co., Ltd. Television receiver with doors for its display screen which doors contain loudspeakers
USD390218S (en) 1996-05-16 1998-02-03 Samsung Electronics Co., Ltd. Television receiver/computer monitor having hinged doors
US6587082B1 (en) * 1997-06-10 2003-07-01 Stacey Y. Moore Multiple access computer monitoring system
US20040135476A1 (en) * 2003-01-07 2004-07-15 Alan Gillengerten Audio visual system and apparatus
US20050146251A1 (en) * 2003-09-17 2005-07-07 Alan Gillengerten Audio visual system
US6997525B2 (en) 2003-09-17 2006-02-14 Alan Gillengerten Audio visual system
US20120321120A1 (en) * 2011-06-14 2012-12-20 Samsung Electronics Co., Ltd. Speaker apparatus
US8891805B2 (en) * 2011-06-14 2014-11-18 Samsung Electronics Co., Ltd. Speaker apparatus
CN102833653B (zh) * 2011-06-14 2017-06-09 三星电子株式会社 扬声器装置
US8970795B2 (en) 2013-04-26 2015-03-03 Alain Lemieux Sliding panels system for hiding a flat screen TV
GB2525767A (en) * 2014-05-01 2015-11-04 Hugh Brogan Speaker device
GB2525767B (en) * 2014-05-01 2017-01-11 Brogan Hugh Speaker device
GB2542714A (en) * 2014-05-01 2017-03-29 Brogan Hugh Speaker device
US10264337B2 (en) 2014-05-01 2019-04-16 Hugh Brogan Speaker device

Also Published As

Publication number Publication date
BE449683A (enrdf_load_stackoverflow)
CH232943A (de) 1944-06-30
NL60178C (enrdf_load_stackoverflow)
FR892422A (fr) 1944-04-06
DE972491C (de) 1959-07-30

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