US3582553A - Loudspeaker system - Google Patents

Loudspeaker system Download PDF

Info

Publication number
US3582553A
US3582553A US690695A US3582553DA US3582553A US 3582553 A US3582553 A US 3582553A US 690695 A US690695 A US 690695A US 3582553D A US3582553D A US 3582553DA US 3582553 A US3582553 A US 3582553A
Authority
US
United States
Prior art keywords
loudspeaker
loudspeaker system
accordance
front panel
upper frequency
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
US690695A
Other languages
English (en)
Inventor
Amar G Bose
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.)
Bose Corp
Original Assignee
Bose Corp
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 Bose Corp filed Critical Bose Corp
Application granted granted Critical
Publication of US3582553A publication Critical patent/US3582553A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • 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
    • H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/024—Positioning of loudspeaker enclosures for spatial sound reproduction

Definitions

  • a loudspeaker system comprises two angularly displaced rear rectangular baffles each nearly filled with four closely spaced full-range small loudspeakers and partially enclosing a substantially fluid-tight volume also enclosed by a front baffle containing a small asymmetrically located loud speaker so that the angularly inclined baffles typically face a wall to which the front baffle is generally parallel.
  • the small loudspeakers are connected in phase and energized through means including a complementing circuit so that the overall system is characterized by a phase-frequency response characteristic that pleasingly reproduces music.
  • the present invention relates in general to loudspeaker systems and more particularly concerns a novel compact loudspeaker system that is compact and relatively easy and inexpensive to manufacture and provides realistic reproduction of sound with negligible distortion.
  • Bose 2201 The standard of loudspeaker systems is the commercially available Bose 2201 spherical radiating system comprising 22 closely spaced small loudspeakers substantially filling a spherical triangle baffle of about 25-inch radius and comprising means for enclosing a substantially fluidtight volume preferably situated in the corner of a room.
  • This loudspeaker system takes advantage of Bose known property that in a concert hall most of the sound reaches the listener by reflection.
  • the Bose 2201 is characterized by the advantages enumerated in Bose U.S. Pat. Nos. 2,915,588 and 3,038,964.
  • the Bose 2201 represents a practical approximation to an ideal vibrating spherical surface that is so nearly perfect that it is believedlisteners are unable to distinguish between music reproduction provided by the Bose 2201 and that which would be provided by an ideal pulsating sphere.
  • This result was established by separating the room transfer characteristics from the loudspeaker system characteristics in the following manner.
  • a spark source situated in the corner of a room was compared with a Bose loudspeaker situated in the same comer.
  • a high speed digital computer determined the Greens function of the room and produced samples of music that would be produced by an ideal pulsating sphere in the room for comparison with the same sample of music that would be provided bya Bose loudspeaker.
  • Bose 2201 is an absolute standard that can be used to compare in an actual listening room the performance between an existing loudspeaker system and the Bose 2201.
  • loudspeakers perform differently in different rooms and perform in a room differently from the performance in an anechoic chamber (a special suspended compartment surrounded by sound absorbing wedges of material so that the compartment is essentially free of sound echoes). Nevertheless, not infrequently it is thought that anechoic chamber measurements of loudspeakers represent meaningful indicia of loudspeaker performance. In fact, recent work shows that anechoic chamber measurements provide less meaningful information for evaluating the performance of a loudspeaker in a listening room than previously thought.
  • lt is another object of the invention to achieve the preceding objects with a structure that may be situated in a convenient location in a room.
  • a front panel arranged to be situated normally parallel to a wall and means associated with a loudspeaker cabinet having the front panel for supporting upper frequency radiating means to that the radiating means normally faces out the back of the loudspeaker cabinet with its axis oriented at an angle to the front panel so that with the loudspeaker cabinet normally positioned with the front panel generally parallel to a wall, the upper frequency radiating means emits at least upper frequency sound; that is, sound having spectral components above 200 Hz., in a beam that has both component directed away from the front panel toward the wall and to the side of the cabinet.
  • the loudspeaker system comprises at least two normally rear baffles forming an angle with each other and at an angle to the front panel and comprising the loudspeaker cabinet with each baffle having at least one small loudspeaker thereon with each small loudspeaker normally directing upper frequency sound in a beam having both a rearward and sideward component of the sound beam radiated by the speaker associated with the other baffle, the loudspeaker preferably being cophasally excited.
  • the normally rear baffles contain a number of closely spaced loudspeaker connected in phase and nearly filling the baffle.
  • the front panel comprises a baffle containing at least one small loudspeaker cophasally excited with the other small loudspeakers for providing direct sound to the listener.
  • the small loudspeaker are essentially full-range high compliance loudspeakers coupled to a signal source by means including a complementing circuit to establish a system phase-frequency response characteristic that results in exceptionally pleasing reproduction of sound.
  • FIG. 1 is a diagrammatic representation to illustrate how a listener in a concert hall receives mostly reflected sound ener- 8);
  • FIG. 2 is a diagrammatic representation of a stereo loud speaker system according to the invention illustrating how the invention tends to simulate the ratio of reflected to direct sound for the listener in a room of the sound received by the listener in a concert hall of FIG. 1;
  • FIG. 3 is a perspective view of a preferred embodiment of a loudspeaker system according to the invention.
  • FIG. 4 is a front view of the system of FIG. 3;
  • H6. 5 is a block diagram illustrating the logical arrange ment for incorporating the complementing circuit for coaction with the speaker system according to the invention with a commercially available receiver or integrated preamplifieramplifier;
  • FIG. 6 is a schematic circuit diagram of an exemplary complementing circuit
  • FIG. 7 is a block diagram illustrating the logical arrangement for using a single one of the speaker systems of FIGS. 3 and 4 to achieve stereo reproduction;
  • FIG. 8 shows a typical frequency response characteristics of the circuit of FIG. 6.
  • FIG. 9 is a diagrammatic representation of a single unit stereo reproducer in a room.
  • H6. 1 there is shown a representation of a listener 11 in a concert hall 12 facing the stage 13 receiving sound from point 15 on the left side of that stage and 16 on the right side of the stage directly over the paths l7 and 18, respectively, and indirectly over paths such as 2] and 22 from the left side, and 23 and 24 from the right side.
  • lt is believed that of the order of 87 percent of the sound which reaches a listener in the concert hall is through reflection.
  • FIG. 2 there is shown a diagrammatic representation of loudspeakers according to the invention providing sound to a listener 11' in room 12' by a left speaker 15 and a right speaker 16 providing direct sound over paths l7 and 18, respectively from direct loudspeakers 21 and 22, respectively.
  • the left speaker system 15' provides indirect sound over paths including path 21' and 22 from left rear panel 33 and right rear panel 34, respectively.
  • right speaker 16 provides indirect sound over paths including path 23 and path 24 from right rear panel 35 and left rear panel 36, respectively.
  • FIG. 3 there is shown a perspective view of loudspeaker l5 and 16' showing left panels 33 and 36 and right panels 34 and 35.
  • the position of front loudspeaker 31 and 32 is indicated by dotted lines in FIG. 3.
  • Each of the rear panels includes four loudspeakers 41, 42, 43 and 44 on the left, and 45, 46, 47 and 48 on the right. These loudspeakers are preferably closely spaced and substantially fill each of the panels.
  • these loudspeaker are 4-inch speakers with the 4%inch circular opening with speakers separated from adjacent ones by about three-sixteenth inch and from the baffle edges by about one-half inch so that each rear panel is a %inch piece of plywood about IO'inehes by about 10%inches forming an angle of so that the angle between each of the rear panels and the wall upon which they direct sound for reflection is substantially 30.
  • FIG. 4 shows a front view of the loudspeaker system 15 16' showing front baffle 51.
  • This baffle may be 74inch plywood about 17 inches by about 10%inches.
  • the essentially fluidtight enclosure is completed by a pair of side panels, such as 52, a top panel such as 53.and a like bottom panel (not shown).
  • Side panel 52 is typically of 53inch plywood about 10%inches high by about 5%:inches wide, and the top and bottom panels are dimensioned so that they cover the opening defined by the rear baffle, front baffle and side panels.
  • the distance between side panels is about 16%inches.
  • the distance between the front baffle and thejunction of the rear baffles is about 9 9/l6 inches.
  • the top and bottom panels may extend beyond the baffles and side panels.
  • the baffles an both side panels may be surrounded by suitable grille cloth.
  • the individual small loudspeakers are all commercially available full range CTS 4Cl077 high compliance ceramic magnet 4-inch loudspeakers having a nominal impedance of 8 ohms with the speakers connected in series-parallel so that the impedance to an amplifier of the series-parallel system is 8 ohms.
  • speakers 42, 43 and 44 may be connected in series to form one series group, speakers 45, 47 and 48 connected in series to form a second series group and speakers 41, 46 and the front speaker connected in series to form a third series group.
  • Each of these series groups presents an impedance of substantially 24 ohms. When the three groups are connected in parallel, the effective impedance is then 8 ohms.
  • the individual speakers are cophasally excited so that all the speaker diaphrams move out together and in together in response to the same input signal.
  • the inside volume may be filled with fiberglass if desired.
  • a feature of the invention resides in minimizing undesired resonances.
  • baffles each containing at least one loudspeaker but none of these baffles are parallel to another surface. Sharp resonances normally encountered when a baffle is parallel to another surface at frequencies when the separation between the baffle and such another surface is a multiple of a quarter wavelength are thus minimized.
  • the individual resonances of each individual loudspeaker when the loudspeakers are acoustically coupled are normally not exactly the same as the other loudspeakers, sharp resonance effects normally encountered when a single loudspeaker reproduces a given frequency range embracing the speaker resonances, are believe to be significantly reduced.
  • FIG. 5 there is shown a block diagram generally illustrating the logical arrangement of a system including a conventional receiver 54, a complementing circuit 55 and a speaker 16' energized by the 8 ohm output terminals of receiver 54.
  • a typical receiver 54 has a tape monitor jack 55 which is coupled to the input of complementing circuit 55 by input cable 56.
  • a typical receiver 54 also has a pair of tape recording jacks one jack 57 coupling the output of complementing circuit 55 by output cable 58 to the amplifier input when the receiver (or integrated preamplifier-amplifier) selector switch is in the tape monitor position.
  • Jack 55 is coupled to the output of the preamplifier section of the receiver.
  • input cable 56 may be couple to the preamplifier output jack and output cable 58 may be coupled to the amplifier jack.
  • FIG. 6 there is shown schematic circuit diagram of a complementing circuit suitable to use with the specific system described above. Since those skilled in the art will be able to practice the invention by constructing the specific circuit with the indicated parameters, the specific circuit will not be discussed further other than to indicate the frequency response characteristic in FIG. 8. Adjustment of resistor R alters the lift in low frequency end indicated while adjustment of the resistance R, alters the lift in the high frequency end as indicated with the intermediate range remaining substantially flat as shown. For minimum deviation between reproduction of the system according to this invention and the Bose 2201, the curve designated 220l should be selected. However, for certain recordings it may be more pleasing to the listener if other settings are chosen.
  • the complementing circuit is believed to to also enhance the phase frequency response characteristic of the system.
  • the system phase response characteristic is believed to be important toward the proper reproduction of low frequency signals below 200 Hz.
  • the human ear can detect phase differences at the low frequencies corresponding to delays in the order of a number of milliseconds.
  • Most conventional loudspeaker systems have an uncompensated resonance in a low bass region which results in considerable phase distortion. However undetectable this phase distortion may be when reproducing single low tones, the
  • FIG; 7 there is shown'a combined blockschematic circuit diagram of a means for energizing but a singlespeaker system to provide many of the advantages of the present invention with but a single loudspeaker enclosure,
  • Speakers 45,46, 47 and 48on*the right'panel are'coupled'in series, parallelas shown and coupled to the B- channel'output 65.
  • the front speaker 31, 32 ' is coupledto the centerchannel output 66 of stereo receiver 6 Most stereo'receiversand stereo amplifiers have such a center channel output.
  • AIternateIyQthe'center loudspeaker may be connected so that it receives'a signal current'representative of'thesum of the signals in the left and'right channels provided by an appropriate combining circuit.
  • the winding of the center speaker may be connected'so that itis in'series with at least onewinding :of a speakeron' the left baffle and at least one-winding of a speaker on the right baffle.
  • FIG. 9 there is shown adiagrammatic representation of a.suitable-arrangement ina room 'l2'of single unit 7l.connected as shown in FIG. 7'.
  • speaker system unit 7l is locatedalong'the center-line ofthe room as shownspaced from the front wall of'the'room so that listener 11 receives Archannelsignalthrough reflection from theleft wall of the roomand Bchannel'informationfrom the right wall of theroomand center channel informationfrom the front panel.
  • Speaker systemunit '7] ispreferably-placed far enough frbmthe-wall (usually'about a foot) to achieve a desired-degree of apparent spreading of the sound, but not so far that-effective reflection fromthewallis notobtained.
  • an isolating wall 76 that divides the unit into left substantially fluidtight compartme'nt 74 and a right substantially fluidtight compartment 75.
  • Such an isolating wall helps reduce undesired mixing of left and right channels inside the enclosure and thereby enhances the stereo performance maintaining a relatively high degree of effective channel separation.
  • a Bose 220i is located in the corner of a listening room.
  • a good full-range 'microphone is also located on a stand in a typical listening position in the room.
  • a suitable microphone for this purpose is the B&K commercially available microphone and associated preamplifier.
  • the Bose 2201 is fed with a swept frequency signal preferably narrow band noise, such as that provided by a commercially available General Radio sound and vibration analyzer energized with pink noise capable of being swept over the full audio frequency range by a mechanical drive that may be synchronized with a General Radio logarithmic graphical recorder.
  • the output of the microphone preamplifier is applied to the General Radio graphical recorder as the analyzer is swept over the frequency range to provide a frequency response characteristic at that point in the room that is representative of the transmission properties-of the room.
  • the microphone remains in the same position and then the loudspeaker system, such as that shown in FIG. 3, is energized through a power amplifier having an essentially flat frequency response with the signal provided by the sound and vibration analyzer, the loudspeaker being located in a typical location for reproduction about a foot from a wall oriented generally as shown in FIG. 2.
  • the sound and vibration analyzer is again swept over the audio frequency range, and the output of the microphone preamplifier applied to the graphical recorder to provide arepresentation of the transfer characteristics of both the loudspeaker system thus energized and the room to that same'listening point previously measured with respect to the Bose 2201.
  • the difference between the graphical representation of the Bose 220i and that of the uncompensated unit of FIG. 3 is determined graphically on a point-by-point basis over the frequency range to yield the preferred frequency response characteristic of the'complementing circuit. If desired, means may be'provided or alteringthe degree of lift at the high and low en'ds to'satisfy the preference of an individual listener, especially since many commercial recordings are overcompen'sated.
  • the overall free field axial infinite'baffle pressure high frequency response provided by the complementing circuit coacting with a one of the small loudspeakers is higher relative to the response in the middle range of frequencies.
  • This risein response typically commences at a frequencyabove 2' kHz. and may be effected electrically, mechanically, through acoustic attenuation, by combination 'thereof or by other suitable means.
  • the overall system radiated power density spectrum response (proportional to pressure response squared) provide by the loudspeaker system according to theinv'ention including complementing circuit is essentially uniform.
  • the baffle may be tilted upward or downwardfor'low andhigh locations, respectively, of the system.
  • Different numbers and different kinds of speakers may beus'ed andthe ratio of direct to reflected soundretained in nearly the same desired ratio by'radiating less high frequency energy from the-speaker on the front baffle as a result ofelectrical,'mechanical or acoustical attenuation.
  • an especially'corripact and inexpensive embodiment of the invention might include justone loudspeaker on each rear baffle and one on'the'front baffle with the front loudspeaker energized trough anattenuating network that delivers about onefourth the'hig'hfrequen'cy energy to the front loudspeaker than is delivered to eachof the rear loudspeakers.
  • a loudspeaker system comprising, first means defining a front panel arranged to be situated normally generally parallel to a wall,
  • second means defining a rear baffle including means for supporting at least one upper frequency radiating means
  • means including said first means and said second mean for defining a loudspeaker cabinet enclosing an internal volume
  • said first and second means being relatively positioned so that with said loudspeaker cabinet normally positioned with said front panel generally parallel to a wall, a plurali' ty of upper frequency radiating means carried by said means for supporting are positioned for emitting upper frequency sound in a beam that has a rearward component directed away from said front panel toward said wall and a sideward component directed generally parallel to said wall,
  • said means including said upper frequency radiating mean and said loudspeaker cabinet enclosing said internal volume substantially fluidtight and means associated with said upper frequency radiating means for establishing the free field infinite baffle pressure frequency response along the axis thereof higher relative to the response in the middle range of audio frequencies while coacting with all the elements in said loudspeaker system to provide an essentially uniform radiated power density spectrum frequency response over substantially the entire audible frequency range when said loudspeaker system is normally positioned with said front panel generally parallel to a wall.
  • third means defining another rear baffle including means for supporting at least another upper frequency radiating means, said third 'means being positioned relative to said first and second means so that with said loudspeaker cabinet normally positioned with said front panel generally parallel to a wall, an upper frequency radiating means carried by said means for supporting of said third means is positioned for emitting upper frequency sound in a beam that has a rearward component directed away from said front panel toward said wall and a sideward component directed generally parallel to said wall opposite to said first-mentioned sideward component.
  • a loudspeaker system in accordance with claim 2 wherein said first means, said second means and said third means are nonparallel to one another.
  • said loudspeaker cabinet comprises a pair of side panels each interconnecting a respective normally vertical edge of said front panel with a normally vertical edge of a respective rear baffle flat panel to define said internal volume as of pentagonal cross section and interconnecting generally parallel top and bottom panels to coact therewith and define said internal volume.
  • each of said rear baffle panels is substantially square.
  • each of said coupling means includes means for energizing each small loudspeaker coupled thereto with electrical energy over substantially the full range of audio frequenciesv 29.
  • a reflecting loudspeaker system having at least a rear panel for facing an adjacent wall and a front panel for facing the normal listening area when normally positioned in a room comprising, 1
  • said upper frequency radiating means for establishing a radiation characteristic of said upper frequency radiating means so that the free field infinite baffle pressure response along the axis thereof is higher relativeto the response in the middle range of audio frequencies while coacting with all the elements in said reflecting loudspeaker system to provide an essentially uniform radiated power density spectrum frequency response over substantially the entire audible frequency range when said loudspeaker system is in a normal room listening position.
  • a loudspeaker system having at least a rear panel for facing an adjacent wall and a front panel for facing the normal listening area when normally positioned in a room comprising,
  • sound radiating means for first directing most of the sound energy therefrom across the plane of said rear panel upon said adjacent wall and then to a listener when said sound radiating means is normally positioned in a room
  • a first loudspeaker system in accordance with claim 1 is a first loudspeaker system in accordance with claim 1
  • the first and second loudspeaker system cabinets being spaced along said wall with the front panel of each generally parallel to said wall and said second means of each facing said wall so that upper frequency sound beams directed from each second means are reflected from said wall through the region between said cabinets.
  • a loudspeaker system having at least a rear panel for facing an adjacent wall and a front panel for facing the normal listening area when normally positioned in a room comprising,
  • a loudspeaker system having at least a rear panel for facing an adjacent wall and a front panel for facing the normal listening area when normally positioned in a room comprising,
  • radiating means for directing most of the sound energy therefrom first across the plane of said rear panel, then said adjacent wall and then to a listener when said sound radiating means is normally positioned in a room while directing at least some of said sound energy directly to a listener when said sound radiating means is normally positioned in a room without reflection
  • a loudspeaker system comprising,

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Stereophonic System (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Circuit For Audible Band Transducer (AREA)
US690695A 1967-12-04 1967-12-04 Loudspeaker system Expired - Lifetime US3582553A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US69069567A 1967-12-04 1967-12-04

Publications (1)

Publication Number Publication Date
US3582553A true US3582553A (en) 1971-06-01

Family

ID=24773540

Family Applications (1)

Application Number Title Priority Date Filing Date
US690695A Expired - Lifetime US3582553A (en) 1967-12-04 1967-12-04 Loudspeaker system

Country Status (5)

Country Link
US (1) US3582553A (en, 2012)
JP (1) JPS5238406B1 (en, 2012)
DE (2) DE1812596C3 (en, 2012)
FR (1) FR1593711A (en, 2012)
GB (2) GB1253045A (en, 2012)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933219A (en) * 1974-04-08 1976-01-20 Ambient, Inc. Speaker system
US3947635A (en) * 1973-09-12 1976-03-30 Frankman Charles W Integrated stereo speaker system
US3980829A (en) * 1973-06-05 1976-09-14 Harold Norman Beveridge Wide angle cylindrical wave loudspeaker extending approximately from floor to ceiling height with a lens
DE2739523A1 (de) * 1976-09-02 1978-03-16 Bose Corp Lautsprechersystem
US4181819A (en) * 1978-07-12 1980-01-01 Cammack Kurt B Unitary panel multiple frequency range speaker system
EP0007453A1 (en) * 1978-07-28 1980-02-06 Bose Corporation Varying loudspeaker spatial characteristics
US4227050A (en) * 1979-01-11 1980-10-07 Wilson Bernard T Virtual sound source system
JPS59122199A (ja) * 1982-12-23 1984-07-14 エス・イ−・エス・サウンド・エレクトロニック・システムス・エス・ア− 立体音響効果のバツフル
US4503930A (en) * 1982-09-03 1985-03-12 Mcdowell Vaughn P Loudspeaker system
US4860363A (en) * 1985-04-12 1989-08-22 Mitsubishi Denki Kabushiki Kaisha Loudspeaker system
DE9017150U1 (de) * 1990-12-19 1991-03-21 Keplinger, Rainer, 8865 Hainsfarth Lautsprechereinheit
EP0356871A3 (de) * 1988-08-30 1991-11-13 TELEFUNKEN Fernseh und Rundfunk GmbH Lautsprecheranordnung für einen HDTV-Fernsehempfänger
EP0624047A1 (en) * 1993-05-06 1994-11-09 Bose Corporation Asymmetrical transducing
US5502772A (en) * 1994-07-18 1996-03-26 Felder; Charles J. Speaker having improved sound square, sound bank, sound angle, sound wedge and sound radiators
US6760446B1 (en) 1998-10-14 2004-07-06 Francis Allen Miller Point source speaker system
US6778675B2 (en) 2001-01-22 2004-08-17 Yoshito Maruo Speaker device
US20050013454A1 (en) * 2003-07-14 2005-01-20 Wan-Fang Huang Multi-channel audio center speaker device
US20060269069A1 (en) * 2005-05-31 2006-11-30 Polk Matthew S Jr Compact audio reproduction system with large perceived acoustic size and image
US20080285762A1 (en) * 2007-05-15 2008-11-20 Keiichi Iwamoto Point source speaker systems
US20090226019A1 (en) * 2008-03-10 2009-09-10 Robert Bosch Gmbh Offset baffles for acoustic signal arrival synchronization
US8867749B2 (en) 2011-04-18 2014-10-21 Paul Blair McGowan Acoustic spatial projector
US9055360B1 (en) * 2014-04-07 2015-06-09 Joseph W Johnson Sonic projector system
EP3128762A1 (en) 2015-08-03 2017-02-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Soundbar
GB2568223A (en) * 2017-09-15 2019-05-15 Gowler Hart David Bass generator 20Hz> audio system reinforcement
US10327067B2 (en) 2015-05-08 2019-06-18 Samsung Electronics Co., Ltd. Three-dimensional sound reproduction method and device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932060A (en) * 1987-03-25 1990-06-05 Bose Corporation Stereo electroacoustical transducing
NL8802488A (nl) * 1988-10-11 1990-05-01 Rob Jurrien Oliemuller Luidsprekerbox.
FI81471C (fi) * 1988-11-08 1990-10-10 Timo Tarkkonen Hoegtalare givande ett tredimensionellt stereoljudintryck.
GB9415200D0 (en) * 1994-07-28 1994-09-21 Almossawi H I H The sweet spot speaker
DE102016002260B4 (de) 2016-02-25 2021-10-21 Audioblock Gmbh Lautsprecherbox

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2256057A (en) * 1939-03-23 1941-09-16 Rca Corp Tone control circuit
US2544742A (en) * 1946-12-31 1951-03-13 Vibra Sonic Inc Cubic loud-speaker cabinet
US2610694A (en) * 1944-05-30 1952-09-16 Hartford Nat Bank & Trust Co Stereophonic reproduction apparatus
US2689016A (en) * 1953-04-14 1954-09-14 Henry C Lang Sound reproducing system
US2710662A (en) * 1948-12-23 1955-06-14 Armour Res Found Sound projection system
US2915588A (en) * 1956-08-06 1959-12-01 Amar G Bose Pressure wave generation
US3026957A (en) * 1959-06-02 1962-03-27 Gladstone Lewis Loudspeaker system

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3104729A (en) * 1963-09-24 Stereophonic sound reproducing loudspeaker system
US1932343A (en) * 1932-05-04 1933-10-24 Philadelphia Storage Battery Radio loud speaker cabinet
DE1687888U (de) * 1951-07-09 1954-11-25 Nordwestdeutscher Rundfunk Lautsprecheranordnung.
DE1708913U (de) * 1952-09-15 1955-10-20 Philips Nv Schallwiedergabevorrichtung mit getrennter wiedergabe der niedrigen und hohen frequenzen.
CH325519A (de) * 1954-12-01 1957-11-15 Zoellig Karl Für Schallwiedergabe eingerichtetes Gerät mit mindestens zwei Lautsprechern verschiedener Beschallungsrichtung
DE1790846U (de) * 1955-08-19 1959-06-25 Imp Rundfunk Und Fernsehwerk G Schallfuehrung fuer elektro-akustische geraete und fernseh-geraete mit tonteil.
DE1790062U (de) * 1956-10-25 1959-06-11 Roland Rabl Lautsprecheranordnung.
GB898445A (en) * 1958-09-04 1962-06-06 Victor Valchera Improvements in or relating to stereophonic sound reproducing apparatus
US3241631A (en) * 1964-01-31 1966-03-22 Manieri Domenico High-fidelity column-type stereomonophonic diffuser with regulated sound deflection
GB1224240A (en) * 1968-08-08 1971-03-03 Advance Data Systems Ltd Article dispensing apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2256057A (en) * 1939-03-23 1941-09-16 Rca Corp Tone control circuit
US2610694A (en) * 1944-05-30 1952-09-16 Hartford Nat Bank & Trust Co Stereophonic reproduction apparatus
US2544742A (en) * 1946-12-31 1951-03-13 Vibra Sonic Inc Cubic loud-speaker cabinet
US2710662A (en) * 1948-12-23 1955-06-14 Armour Res Found Sound projection system
US2689016A (en) * 1953-04-14 1954-09-14 Henry C Lang Sound reproducing system
US2915588A (en) * 1956-08-06 1959-12-01 Amar G Bose Pressure wave generation
US3026957A (en) * 1959-06-02 1962-03-27 Gladstone Lewis Loudspeaker system

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980829A (en) * 1973-06-05 1976-09-14 Harold Norman Beveridge Wide angle cylindrical wave loudspeaker extending approximately from floor to ceiling height with a lens
US3947635A (en) * 1973-09-12 1976-03-30 Frankman Charles W Integrated stereo speaker system
US3933219A (en) * 1974-04-08 1976-01-20 Ambient, Inc. Speaker system
DE2739523A1 (de) * 1976-09-02 1978-03-16 Bose Corp Lautsprechersystem
DE2760480C2 (en, 2012) * 1976-09-02 1992-07-09 Bose Corp., Framingham, Mass., Us
US4181819A (en) * 1978-07-12 1980-01-01 Cammack Kurt B Unitary panel multiple frequency range speaker system
EP0007453A1 (en) * 1978-07-28 1980-02-06 Bose Corporation Varying loudspeaker spatial characteristics
US4218583A (en) * 1978-07-28 1980-08-19 Bose Corporation Varying loudspeaker spatial characteristics
US4227050A (en) * 1979-01-11 1980-10-07 Wilson Bernard T Virtual sound source system
US4503930A (en) * 1982-09-03 1985-03-12 Mcdowell Vaughn P Loudspeaker system
JPS59122199A (ja) * 1982-12-23 1984-07-14 エス・イ−・エス・サウンド・エレクトロニック・システムス・エス・ア− 立体音響効果のバツフル
US4572325A (en) * 1982-12-23 1986-02-25 Walter Schupbach Stereophonic baffle
EP0114951A1 (fr) * 1982-12-23 1984-08-08 Walter Schupbach Enceinte stéréophonique
US4860363A (en) * 1985-04-12 1989-08-22 Mitsubishi Denki Kabushiki Kaisha Loudspeaker system
EP0356871A3 (de) * 1988-08-30 1991-11-13 TELEFUNKEN Fernseh und Rundfunk GmbH Lautsprecheranordnung für einen HDTV-Fernsehempfänger
DE9017150U1 (de) * 1990-12-19 1991-03-21 Keplinger, Rainer, 8865 Hainsfarth Lautsprechereinheit
EP0624047A1 (en) * 1993-05-06 1994-11-09 Bose Corporation Asymmetrical transducing
WO1997036455A1 (en) * 1994-07-18 1997-10-02 Felder Charles J Speaker having improved sound square, sound bank, sound angle, sound wedge and sound radiators
US5502772A (en) * 1994-07-18 1996-03-26 Felder; Charles J. Speaker having improved sound square, sound bank, sound angle, sound wedge and sound radiators
US6760446B1 (en) 1998-10-14 2004-07-06 Francis Allen Miller Point source speaker system
US7460673B2 (en) 1998-10-14 2008-12-02 Kentech Labs, Inc. Point source speaker system
US6778675B2 (en) 2001-01-22 2004-08-17 Yoshito Maruo Speaker device
US20050013454A1 (en) * 2003-07-14 2005-01-20 Wan-Fang Huang Multi-channel audio center speaker device
US6940990B2 (en) * 2003-07-14 2005-09-06 Wan-Fang Huang Multi-channel audio center speaker device
US7817812B2 (en) 2005-05-31 2010-10-19 Polk Audio, Inc. Compact audio reproduction system with large perceived acoustic size and image
US20060269069A1 (en) * 2005-05-31 2006-11-30 Polk Matthew S Jr Compact audio reproduction system with large perceived acoustic size and image
US20080285762A1 (en) * 2007-05-15 2008-11-20 Keiichi Iwamoto Point source speaker systems
US20090226019A1 (en) * 2008-03-10 2009-09-10 Robert Bosch Gmbh Offset baffles for acoustic signal arrival synchronization
US8036410B2 (en) 2008-03-10 2011-10-11 Robert Bosch Gmbh Offset baffles for acoustic signal arrival synchronization
US8867749B2 (en) 2011-04-18 2014-10-21 Paul Blair McGowan Acoustic spatial projector
US9055360B1 (en) * 2014-04-07 2015-06-09 Joseph W Johnson Sonic projector system
US10327067B2 (en) 2015-05-08 2019-06-18 Samsung Electronics Co., Ltd. Three-dimensional sound reproduction method and device
EP3128762A1 (en) 2015-08-03 2017-02-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Soundbar
WO2017021162A1 (en) 2015-08-03 2017-02-09 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Soundbar
US10863276B2 (en) 2015-08-03 2020-12-08 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Soundbar
GB2568223A (en) * 2017-09-15 2019-05-15 Gowler Hart David Bass generator 20Hz> audio system reinforcement

Also Published As

Publication number Publication date
GB1253045A (en, 2012) 1971-11-10
DE1812596C3 (de) 1982-05-19
DE6809798U (de) 1974-05-02
DE1812596B2 (de) 1980-05-08
JPS5238406B1 (en, 2012) 1977-09-29
DE1812596A1 (de) 1969-10-16
GB1253044A (en, 2012) 1971-11-10
FR1593711A (en, 2012) 1970-06-01

Similar Documents

Publication Publication Date Title
US3582553A (en) Loudspeaker system
US3727004A (en) Loudspeaker system
US4256922A (en) Stereophonic effect speaker arrangement
US7676047B2 (en) Electroacoustical transducing with low frequency augmenting devices
US4410063A (en) Loudspeaker system
US4230905A (en) Stereophonic system with discrete bass channels
US4227050A (en) Virtual sound source system
US3393766A (en) Speaker system
US4266092A (en) Loudspeaker system with broad image source
US4569076A (en) Motion picture theater loudspeaker system
CA1146081A (en) Sound reproducing systems utilizing acoustic processing unit
US4348552A (en) Direct/reflecting speaker system and triangular shaped enclosure
US4410761A (en) Stereo loudspeaker system for a picture reproducing screen
JP3679367B2 (ja) パーソナルコンピュータ用オーディオスピーカシステム
US3588355A (en) Stereophonic loudspeaker system
JPH02261299A (ja) ステレオ音を改善する装置
US5033577A (en) Room sound reproducing
US4349697A (en) Sound reproduction system
JP3063639B2 (ja) スピーカ装置
AU2003202084A1 (en) Apparatus and method for producing sound
US4181819A (en) Unitary panel multiple frequency range speaker system
GB2037130A (en) Single source stereo sound
US5943431A (en) Loudspeaker with tapered slot coupler and sound reproduction system
US3166147A (en) Loudspeaker system
US4621708A (en) Tweeter bidirectional radiating