EP0248172A2 - Stereophonischer Lautsprecher - Google Patents

Stereophonischer Lautsprecher Download PDF

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Publication number
EP0248172A2
EP0248172A2 EP87105422A EP87105422A EP0248172A2 EP 0248172 A2 EP0248172 A2 EP 0248172A2 EP 87105422 A EP87105422 A EP 87105422A EP 87105422 A EP87105422 A EP 87105422A EP 0248172 A2 EP0248172 A2 EP 0248172A2
Authority
EP
European Patent Office
Prior art keywords
enclosure
loudspeakers
speakers
transducers
enclosure according
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.)
Granted
Application number
EP87105422A
Other languages
English (en)
French (fr)
Other versions
EP0248172A3 (en
EP0248172B1 (de
Inventor
Walter Schupbach
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.)
SES Sound Electronic Systems SA
Original Assignee
SES Sound Electronic Systems SA
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 SES Sound Electronic Systems SA filed Critical SES Sound Electronic Systems SA
Priority to AT87105422T priority Critical patent/ATE90171T1/de
Publication of EP0248172A2 publication Critical patent/EP0248172A2/de
Publication of EP0248172A3 publication Critical patent/EP0248172A3/fr
Application granted granted Critical
Publication of EP0248172B1 publication Critical patent/EP0248172B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • 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
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/022—Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure

Definitions

  • Monolithic stereophonic speakers are known, such as those described for example in US Pat. No. 4,572,325. Such speakers make it possible, using a monolithic device, that is to say one that does not have two restitution columns sound, but only one, a better restitution of the sound space, or acoustic environment than traditional devices with two speakers.
  • these monolithic speakers allow an excellent localization of the sound by the listeners, that is to say a stereophonic reproduction of the sounds, which is practically independent of the position of the listener with respect to the speaker which is not the case during the sound reproduction using two separate speakers or columns.
  • the aim of the present invention is to produce a monolithic stereophonic enclosure which overcomes the aforementioned drawbacks while retaining the advantages relating to the quality of the sound reproduction obtained by the speakers described in the aforementioned US patent.
  • the subject of the present invention is a monolithic stereophonic enclosure comprising a first group of transducers arranged along a first line and supplied by all or part of the "straight" signal from an amplifier of a hi-fi system as well as a second group of transducers arranged along a second line, forming an angle with said first line, and supplied by a "left" signal from said amplifier, characterized in that the first and second groups comprise the same number of transducers, by the fact that the signals " right “and” left "supplying the transducer groups are in phase, by the fact that the path separating the active zones of two associated transducers, each belonging to one of the groups, is substantially equal to an odd multiple of the half length of wave of a frequency between 300 and 1000 Hz thus creating an acoustic coupling for this frequency between these two associated transducers, and by the fact that the frequencies of coupling of the different pairs of transducers are different.
  • FIG. 1 shows that the human ear is sensitive, for the perception of music in a range A ranging from approximately 20 Hz to 20 kHz for an intensity ranging from 20 to 90dB.
  • the human ear is sensitive in a more restricted range B and it is only for the zone coming from range C, 300Hz to 5KHz; 40dB to 70dB, restricted, that the listener is able to locate the source of the sounds.
  • This localization is carried out thanks to two parameters, on the one hand the time differential ⁇ t separating the perception of the same wavefront by the left ear and the right ear and on the other hand the sound pressure differential ⁇ p of a wave front between the two ears.
  • Figure 2 shows that the two parameters ⁇ t and ⁇ p allowing the localization of a sound, are used in a practically equivalent way for the zone D centered around 1100Hz, above this frequency it is the sound pressure differential ⁇ p which is preponderant, while below this frequency it is the time differential ⁇ t which is preponderant for the localization of the sound.
  • the sound reproduction device must allow practically everywhere a listening room to realize, for frequencies between 300Hz and 4Khz and acoustic pressures between 40dB and 90dB, by the combination of left and right signals coming from distinct sources but located in a single stereophonic enclosure, the reproduction of the parameters ⁇ t and ⁇ p as they would be generated during a live listening of sounds coming from sources having different positions in relation to the auditor.
  • the pairs of loudspeakers are preferably arranged with respect to each other so as to create a continuous wavefront, taking into account the different coupling frequencies.
  • the first embodiment of the monolithic stereophonic enclosure according to the invention meeting the criteria set out above is illustrated in perspective in Figure 4. It comprises an enclosure having the shape of a cross section of a prism having in cuts the shape of an isosceles triangle, the base of which is formed by the short side.
  • the other two sides 1,2 serve to support groups of speakers each assigned to a right channel, respectively left; each of these groups having the same number of speakers.
  • These two sides 1,2 and the base 3 of this enclosure are connected by front 4 and rear 5 walls thus forming a closed enclosure.
  • Each speaker 6,7,8,9,10 of a group is associated with a speaker 11,12,13,14,15 of the second group to form a pair of speakers separated by a different distance d 'A couple to the other allowing to achieve an acoustic coupling of each of these couples on a different frequency.
  • the pair of speakers 6, 11 is separated by a distance a corresponding to the half wavelength of a frequency of 300Hz.
  • the distances b, c, d, and e separating the loudspeakers from the other pairs correspond respectively to the half wavelength of frequency of 450, 650, 950 and 2000Hz.
  • the response characteristics of the speakers of different pairs can be the same or different.
  • the pair of speakers 6,11 is more particularly suited to the reproduction of low frequencies while the torque 10,15 is more particularly suited to the reproduction of high frequencies.
  • the quality of the sound reproduction depends largely on the quality of the speakers, while the spatiality or sound environment (incorporating the localization of the sounds) largely depends part of the coupling between the loudspeakers of the different pairs covering the frequency range between 300 and 1000 Hz ( ⁇ t).
  • Such a monolithic stereophonic speaker can be placed in the middle of a listening room and generate good quality stereophonic listening in X, Y zones such as those illustrated in FIG. 10.
  • FIG. 5 illustrates a variant of this first embodiment in which the loudspeakers of at least certain pairs are fed by the left amplifiers 16 respectively right 17 through bandpass filters 18, 19 selecting for each of the pairs of speakers thus supplied a different passband frequency.
  • the bandwidth allocated to a pair of loudspeakers will be close to the frequency corresponding to the half wavelength separating said loudspeakers, so that this power supply mode further strengthens the acoustic coupling and therefore the spatial effect of sound reproduction.
  • the localization effect depends mainly on the wave fronts of a frequency between 300 Hz and 1KHz and on the pressure difference ⁇ p between 1000 and 4000Hz and that this localization takes place very quickly during the first millisecond whereas the quality of music transmission depends on a much wider frequency range 20 Hz to 20KHz and is perceived by the human brain for a period of time ranging from 1 to 3 seconds. It is therefore quite possible in practice to distinguish between the means allowing the localization of the sound of those allowing the faithful reproduction of the sounds (music, noises, etc).
  • the acoustic coupling of the loudspeakers belonging to a given torque is effected not by the distances, a .... e, separating them by the interior of the enclosure as previously but by the fact that the length of the half circumference a ⁇ .... e ⁇ corresponding to the length of a wave front separating them from the outside of the enclosure, if we consider a spherical propagation of sound waves, is equal to an odd multiple of the half wavelength corresponding to the desired coupling frequency.
  • a coupling outside the enclosure it is possible to envisage making an enclosure in which both an internal coupling to the enclosure and an external coupling to the enclosure would be made.
  • the wave fronts caused by the different pairs of speakers are not synchronized, which is detrimental both to the location and to the fidelity of the musical reproduction.
  • This coherence of the sound is particularly important for the localization function so that it is possible to limit this synchronization to the pairs of loudspeakers tuned on frequencies between 300 and 1000 Hz.
  • the enclosure has a flat baffle 20 on which are fixed groups of speakers 21, 22, 23, 24 and 25, 26, 27, 28 arranged along two straight lines forming an angle between them.
  • the rear wall of this cabinet is provided with resonance chambers 29, 30, 31, 32 connecting the loudspeakers of the two groups forming pairs 21-25; 22-26; 23-27 and 24-28.
  • the dimensions of these resonance chambers are such that they constitute, for given frequencies stepped between 300Hz and 1KHz, for example for 350Hz, 450Hz, 650Hz and 950Hz, resonators thus allowing coupling for these frequencies of pairs of corresponding loudspeakers.
  • FIGS. 11 and 12 illustrate a third embodiment of the monolithic stereophonic enclosure formed by a base 29, two baffles 30 with a cover 31 and two end walls 32.
  • Each of the baffles 30 serves as support for a group of speakers 33,34,35,36,37,38 forming pairs 33-36, 34-37 and 35-38.
  • a coupling is made as above between the speakers of the same couple at a given frequency (between 300 Hz and 1 kHz) different for each pair of speakers, ensuring that the distances a , b, c are equal to the half wavelength corresponding to the desired coupling frequency.
  • the arrangement of the loudspeakers of each group makes it possible to ensure that in the median plane ZZ of the speaker, corresponding to the frequencies for which the pairs of loudspeakers speakers are coupled, emitted at the same instant, form a common wavefront which further improves the quality of sound reception and localization capabilities.
  • the enclosure comprises two front baffles 39, 40 inclined towards the rear and forming an angle between them.
  • the enclosure is obtained by a base, an upper wall, a rear wall and side walls.
  • Groups of loudspeakers are fixed in each of the baffles 39, 40 and are arranged so as to form pairs 41-42; 43-44; 45-46.
  • An internal or external coupling is carried out for frequencies determined between 300Hz and 1KHz, between the speakers of the same couple to ensure a good reproduction of the parameters defining the localization of the sounds.
  • the groups of loudspeakers are distributed over the baffle along curves so that, for the coupling frequency, the sound fronts of the pairs of loudspeakers merge in the median plane of symmetry of the 'pregnant.
  • FIG. 14 Since as we saw previously the information relating to the spatial localization is only necessary in a frequency range between 300 and 3000Hz while the restitution of the sound quality requires a frequency range going up to about 20 ⁇ 000Hz, we can without further separate this information. It is thus possible to produce an embodiment of the enclosure as illustrated in FIG. 14 having a truncated pyramidal shape with a square or rectangular base, the front face of which is provided with loudspeakers 47 for the low frequencies (20 to 300Hz ), 48 for medium frequencies (300 to 3000Hz) and 49 for high frequencies (3000 to 30 ⁇ 000 Hz) supplied by mono signals. These speakers 47, 48 and 49 are of good quality and it is they which constitute the terminal element of the chain of faithful reproduction of musicality.
  • this enclosure comprises on these lateral faces three pairs of speakers 50, 51 and 52 coupled as we have seen previously on frequencies of for example 350Hz, 600Hz and 1KHz.
  • the position of these loudspeakers is such that the wave fronts of said pair are synchronized for said frequencies in a plane of symmetry of the enclosure.
  • These pairs of loudspeakers are fed by stereo signals making it possible, as we have seen above to broadcast the information ⁇ p and ⁇ t throughout the listening area which allows localization of the sounds.
  • the arrangement of the loudspeakers is such that pairs of right-left loudspeakers are coupled acoustically, inside and / or outside the enclosure, for different frequencies, between 300Hz and 1KHz.
  • the quality of the reproduction is further increased if the loudspeakers are arranged in such a way that a common wavefront is produced in the plane of symmetry of the enclosure for sound waves emitted by the different pairs of speakers for the frequencies to which they are coupled.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Stereophonic System (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Casings For Electric Apparatus (AREA)
  • Headphones And Earphones (AREA)
  • Stereophonic Arrangements (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Percussion Or Vibration Massage (AREA)
EP87105422A 1986-06-05 1987-04-11 Stereophonischer Lautsprecher Expired - Lifetime EP0248172B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105422T ATE90171T1 (de) 1986-06-05 1987-04-11 Stereophonischer lautsprecher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2282/86 1986-06-05
CH2282/86A CH667174A5 (fr) 1986-06-05 1986-06-05 Enceinte stereophonique monolithique.

Publications (3)

Publication Number Publication Date
EP0248172A2 true EP0248172A2 (de) 1987-12-09
EP0248172A3 EP0248172A3 (en) 1989-05-24
EP0248172B1 EP0248172B1 (de) 1993-06-02

Family

ID=4230124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105422A Expired - Lifetime EP0248172B1 (de) 1986-06-05 1987-04-11 Stereophonischer Lautsprecher

Country Status (14)

Country Link
US (1) US4837826A (de)
EP (1) EP0248172B1 (de)
JP (1) JPS62292098A (de)
KR (1) KR940011761B1 (de)
AT (1) ATE90171T1 (de)
AU (1) AU594779B2 (de)
CA (1) CA1280376C (de)
CH (1) CH667174A5 (de)
DE (2) DE248172T1 (de)
DK (1) DK222387A (de)
ES (1) ES2000246T3 (de)
GR (1) GR880300013T1 (de)
NO (1) NO170830C (de)
NZ (1) NZ220304A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5097514A (en) * 1988-05-25 1992-03-17 Mcneill Dennis G Equilateral tetrahedral speaker system
WO1992022990A1 (en) * 1991-06-12 1992-12-23 Canon Research Centre Europe Limited Stereo loudspeaker unit with audio mirrors
WO2012094576A1 (en) * 2011-01-06 2012-07-12 Add-On Technology Co., Ltd. Innovative sound system
US20220099828A1 (en) * 2020-09-25 2022-03-31 Samsung Electronics Co., Ltd. System and method for measuring distance using acoustic signal

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5025473A (en) * 1989-08-24 1991-06-18 Carlsen Ii George D Hemispherical speaker system
DE4244397C2 (de) * 1992-12-29 1996-03-07 Waldemar Kehler Verfahren und Vorrichtung zur stereofonen Wiedergabe und Aufnahme
US5553147A (en) * 1993-05-11 1996-09-03 One Inc. Stereophonic reproduction method and apparatus
US5546468A (en) * 1994-05-04 1996-08-13 Beard; Michael H. Portable speaker and amplifier unit
JP3063639B2 (ja) * 1996-09-26 2000-07-12 ヤマハ株式会社 スピーカ装置
US6801631B1 (en) 1999-10-22 2004-10-05 Donald J. North Speaker system with multiple transducers positioned in a plane for optimum acoustic radiation pattern
EP1232672A1 (de) 1999-11-25 2002-08-21 Embracing Sound Experience AB Verfahren zur verarbeitung und wiedergabe eines stereosignals sowie system zur wiedergabe eines stereotonsignals
JP3521825B2 (ja) * 1999-12-28 2004-04-26 株式会社村田製作所 スピーカシステム
US7409071B1 (en) * 2002-07-12 2008-08-05 Nick Bromer Large-diameter arcuate speaker
FR2857550A1 (fr) * 2003-07-07 2005-01-14 Thierry Comte Enceinte acoustique omnidirectionnelle bipolaire
SE527062C2 (sv) * 2003-07-21 2005-12-13 Embracing Sound Experience Ab Stereoljudbehandlingsmetod, -anordning och -system
JP4127156B2 (ja) * 2003-08-08 2008-07-30 ヤマハ株式会社 オーディオ再生装置、ラインアレイスピーカユニットおよびオーディオ再生方法
US8351616B1 (en) * 2005-11-23 2013-01-08 Graber Curtis E Array of multiple LF transducers with ultrahigh cardioid sound pattern generation
SE530180C2 (sv) * 2006-04-19 2008-03-18 Embracing Sound Experience Ab Högtalaranordning
TWI653897B (zh) * 2016-06-24 2019-03-11 宏碁股份有限公司 揚聲器及應用其之電子裝置
USD843341S1 (en) * 2016-08-31 2019-03-19 Rembrandt Laboratories, Llc Speaker cabinet
EP3568997A4 (de) 2017-03-01 2020-10-28 Dolby Laboratories Licensing Corporation Freistehender stereo-lautsprecher mit mehrfachdispersion
USD918870S1 (en) * 2019-08-09 2021-05-11 SDS Asia Limited, BVI # 1748971 Speaker
USD928735S1 (en) * 2019-08-23 2021-08-24 Lg Electronics Inc. Speaker

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892624A (en) * 1970-02-03 1975-07-01 Sony Corp Stereophonic sound reproducing system
FR2378418A1 (fr) * 1977-01-25 1978-08-18 Rank Organisation Ltd Perfectionnements aux enceintes acoustiques
US4249037A (en) * 1978-11-08 1981-02-03 Dexter John L Pyramid loudspeakers with twin cross-phased mid-range speakers
US4365688A (en) * 1981-03-12 1982-12-28 Blose William G Speaker cabinet
US4572325A (en) * 1982-12-23 1986-02-25 Walter Schupbach Stereophonic baffle

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3241631A (en) * 1964-01-31 1966-03-22 Manieri Domenico High-fidelity column-type stereomonophonic diffuser with regulated sound deflection
US3947635A (en) * 1973-09-12 1976-03-30 Frankman Charles W Integrated stereo speaker system
US4051919A (en) * 1975-12-08 1977-10-04 John M. Buettner High fidelity speaker enclosure
US4054750A (en) * 1976-06-18 1977-10-18 Ralph Montgomery Full range rotatable speaker housing with oppositely directed speakers
JPS54148501A (en) * 1978-03-16 1979-11-20 Akg Akustische Kino Geraete Device for reproducing at least 2 channels acoustic events transmitted in room
US4267405A (en) * 1979-06-05 1981-05-12 Mcintosh Laboratory, Inc. Stereo speaker system for creating stereo images
JPS5645360A (en) * 1979-09-14 1981-04-25 Chiyoda Koki:Kk Grinding device for lens
US4503553A (en) * 1983-06-03 1985-03-05 Dbx, Inc. Loudspeaker system
WO1985002513A1 (en) * 1983-12-02 1985-06-06 Yee Raymond M Sound reproduction system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892624A (en) * 1970-02-03 1975-07-01 Sony Corp Stereophonic sound reproducing system
FR2378418A1 (fr) * 1977-01-25 1978-08-18 Rank Organisation Ltd Perfectionnements aux enceintes acoustiques
US4249037A (en) * 1978-11-08 1981-02-03 Dexter John L Pyramid loudspeakers with twin cross-phased mid-range speakers
US4365688A (en) * 1981-03-12 1982-12-28 Blose William G Speaker cabinet
US4572325A (en) * 1982-12-23 1986-02-25 Walter Schupbach Stereophonic baffle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5097514A (en) * 1988-05-25 1992-03-17 Mcneill Dennis G Equilateral tetrahedral speaker system
WO1992022990A1 (en) * 1991-06-12 1992-12-23 Canon Research Centre Europe Limited Stereo loudspeaker unit with audio mirrors
WO2012094576A1 (en) * 2011-01-06 2012-07-12 Add-On Technology Co., Ltd. Innovative sound system
US10506359B2 (en) 2011-01-06 2019-12-10 Naxos Finance S.A. Innovative sound system
US20220099828A1 (en) * 2020-09-25 2022-03-31 Samsung Electronics Co., Ltd. System and method for measuring distance using acoustic signal

Also Published As

Publication number Publication date
ES2000246A4 (es) 1988-02-01
CA1280376C (fr) 1991-02-19
NO170830B (no) 1992-08-31
NZ220304A (en) 1989-09-27
NO872309L (no) 1987-12-07
AU594779B2 (en) 1990-03-15
ATE90171T1 (de) 1993-06-15
DE3786040D1 (de) 1993-07-08
JPS62292098A (ja) 1987-12-18
KR940011761B1 (ko) 1994-12-23
EP0248172A3 (en) 1989-05-24
GR880300013T1 (en) 1988-10-18
US4837826A (en) 1989-06-06
CH667174A5 (fr) 1988-09-15
DE3786040T2 (de) 1994-01-05
DK222387A (da) 1987-12-06
NO170830C (no) 1992-12-09
ES2000246T3 (es) 1993-12-01
AU7383787A (en) 1987-12-10
DK222387D0 (da) 1987-05-01
NO872309D0 (no) 1987-06-02
EP0248172B1 (de) 1993-06-02
KR880001168A (ko) 1988-03-31
DE248172T1 (de) 1988-04-07

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