EP0613317A1 - Lautsprechersystem - Google Patents

Lautsprechersystem Download PDF

Info

Publication number
EP0613317A1
EP0613317A1 EP94102600A EP94102600A EP0613317A1 EP 0613317 A1 EP0613317 A1 EP 0613317A1 EP 94102600 A EP94102600 A EP 94102600A EP 94102600 A EP94102600 A EP 94102600A EP 0613317 A1 EP0613317 A1 EP 0613317A1
Authority
EP
European Patent Office
Prior art keywords
acoustic tube
sectional area
opening window
air chamber
acoustic
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
EP94102600A
Other languages
English (en)
French (fr)
Other versions
EP0613317B1 (de
Inventor
Satoshi Takayama
Kazuko Honda
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0613317A1 publication Critical patent/EP0613317A1/de
Application granted granted Critical
Publication of EP0613317B1 publication Critical patent/EP0613317B1/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
    • 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2853—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line
    • H04R1/2857—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line for loudspeaker transducers

Definitions

  • the present invention relates to means for enhancing the frequency characteristic and efficiency of a speaker system expanded in the bass register by coupling an acoustic tube to the back side of a speaker unit.
  • a speaker system expanded in the bass register by coupling an acoustic tube to the back side of a speaker unit has been known so far.
  • FIG. 5 is a sectional view showing the constitution of a conventional speaker system.
  • numeral 1 denotes a cabinet
  • 2a, 2b, 2c, 2d and 2e are partitions for composing an acoustic tube by partitioning the inside of the cabinet
  • 3 is an opening window disposed in the lower part of a front panel of the cabinet 1
  • 4 is a speaker unit disposed above the front panel.
  • the partitions 2a, 2b, 2c, 2d and 2e disposed in the cabinet 1 compose an acoustic tube in the cabinet 1, and the sound delivered from the back side of the speaker unit 4 is radiated from the opening window 3 through the acoustic tube.
  • the acoustically magnified sound is radiated from the opening window 3 of the acoustic tube, and the efficiency is notably enhanced near the frequency at the reproduction limit of bass.
  • the speaker system of the invention comprises a speaker unit having the front side coupled to an open space, and an acoustic tube with one end coupled to the back side of the speaker unit and the other end released to a sound field space through an opening window, wherein at least one air chamber is disposed on the way of the route of the acoustic tube, the sectional area of the air chamber is set larger than the sectional area of the acoustic tube, and the sectional area of the opening window is set smaller than the sectional area of the acoustic tube;
  • the speaker system also comprises a speaker unit having the front side coupled to an enclosed space, and an acoustic tube with one end coupled to the back side of the speaker unit and the other end released to a sound field space through an opening window, wherein at least one air chamber is disposed on the way of the route to the acoustic tube, the sectional area of the air chamber is set larger than the sectional area of the acoustic tube, and the sectional area of the opening window is set smaller than
  • the speaker system of the invention operates as follows.
  • the air chamber provided on the way of the acoustic tube acts as an acoustic filter by the reactance component presented by the acoustic compliance of the acoustic tube, and the sound of the medium and high frequency region from the back side of the speaker unit is acoustically cut off, and not released from the opening window.
  • the opening window of the smaller sectional area than the sectional area of the acoustic tube works as the acoustic mass, and the resonance frequency of the acoustic tube is lowered, and the reproduction band is widened to a lower resonance frequency determined by the overall length L of the acoustic tube, so that a speaker system of excellent frequency characteristic may be presented.
  • the branch chamber possessing plural branch routes with different route lengths generates a phase difference in the acoustic tube, and cancels resonance and prevents occurrence of peaks and bottoms.
  • Fig. 1 is a sectional view of the constitution of the first embodiment of the invention.
  • numeral 5 denotes an acoustic tube
  • 6 is an air chamber functioning as an acoustic filter, being formed on the way of the route of the acoustic tube 5 so as to have a wider sectional area than the sectional area of the acoustic tube 5
  • 7 is a speaker unit coupled to the acoustic tube
  • 8 is an opening window functioning as an acoustic mass, possessing a smaller sectional area than the sectional area of the acoustic tube 5.
  • This constitution comprises an acoustic tube 5 coupled to the back side of the speaker unit 7, the air chamber 6 functioning as an acoustic filter on the way of the acoustic tube 5, and the opening window 8 functioning as an acoustic mass.
  • the speaker system of the embodiment acts as follows.
  • the compliance of the air chamber 6 works as capacitance component, and when the frequency of the sound passing through the air chamber 6 becomes higher, the impedance of the air chamber 6 becomes smaller, and attenuated components are radiated from the opening window 8.
  • the resonance frequency of the acoustic tube 5 can be set lower than the resonance frequency determined by the overall length (L).
  • An example of characteristic of the embodiment is indicated by solid line in Fig. 2.
  • an acoustic filter is composed by disposing an air chamber on the way of the route of the acoustic tube, and the sectional area of the air chamber is set larger than the sectional area of the acoustic tube so that its cut-off frequency may be nearly equal to the 3/4 resonance frequency of the acoustic tube, and therefore the interference of the front side sound of the speaker unit and the sound from the opening window in the medium and high frequency is decreased to obtain a smooth frequency characteristic without peaks and bottoms, and by setting the sectional area of the opening window smaller than the sectional area of the acoustic tube, the bass register can be lowered below the frequency determined by the length of the acoustic tube, so that a speaker system of excellent characteristics can be realized.
  • the sectional shape of the air chamber 6 is square, but the shape is not limited as far as the sectional area is not so large, and similar effects can be obtained regardless of the shape, needless to say.
  • the characteristic of the acoustic filter may be set variously.
  • Fig. 3 is a sectional view showing the constitution of the embodiment.
  • the same constituent elements as in embodiment 1 are identified with same reference numerals, and their explanations are omitted.
  • numeral 9 is a cabinet disposed at the front side of the speaker unit in order to form a space of an enclosed structure.
  • the acoustic tube 5 disposed at the back side of the speaker unit 7 improves the reproduction capacity in the low frequency region same as in embodiment 1, and also makes smooth the reproduction sound pressure frequency characteristic in the medium and high frequency region.
  • the cabinet 9 of enclosed structure is disposed at the front side of the speaker unit 7, and by enclosing the air at the front side of the speaker, it is effective to suppress the amplitude of the diaphragm of the speaker under the low frequency region reproduction limit, and the diaphragm does not vibrate abnormally if an excessive input is applied to the speaker unit, and generation of abnormal sound such as bottom beat phenomenon of speaker is prevented, so that a speaker system of high reliability and high resistance to input can be presented.
  • the air chamber in this embodiment disposed along the acoustic tube does not prevent interference with the direct sound from the front side of the speaker unit, but prevents interference with the direct sound due to vibration of the cabinet itself even when enclosed, thereby offering the same effects as in embodiment 1.
  • acoustic tube 5 is folded over only once, but the number of foldings is not limited, as a matter of course.
  • Fig. 4 is a sectional view of the constitution of the third embodiment.
  • numeral 10 is a branch chamber disposed on the way of the route of the acoustic tube 5, and a part of the acoustic tube 5 is branched into a plurality of routes 10a, 10b differing in length.
  • the other constituent elements are same as in the first embodiment and are identified with same reference numerals, and detailed descriptions are omitted.
  • the speaker system of the embodiment functions as follows.
  • the acoustic tube 5 coupled to the back side of the speaker unit 7, and the air chamber 6 disposed on the way present an excellent speaker system excellent in low frequency region reproduction, and smooth in reproduction sound region characteristic in the medium and high frequency region, same as in the first embodiment.
  • a branch chamber 10 disposed on the way of the route of the acoustic tube 5 can cancel sharp peaks and bottoms due to resonance of the acoustic tube 5 by generating phase difference by routes 10a, 10b differing in length, so that an excellent speaker system widened in the reproduction frequency band can be presented.
  • the frequency desired to be canceled can be selected, and it can be set freely as required.
  • the branch chamber 10 is divided into two routes 10a, 10b, but the same effects are obtained by dividing into a plurality of more than two depending on the desired reproduction sound pressure frequency characteristic.
  • the air chamber on the way of the acoustic tube to compose the acoustic filter, formation of peaks and bottoms due to resonance frequency of higher degree can be prevented, and by disposing branch chambers differing in the route length on the way of the acoustic tube, the resonance in the acoustic tube is canceled by generating phase difference, and formation of peaks and bottoms of frequency characteristic is prevented, so that a smooth frequency characteristic can be realized.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • 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)
EP19940102600 1993-02-24 1994-02-21 Lautsprechersystem Expired - Lifetime EP0613317B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP35037/93 1993-02-24
JP3503793A JPH06253383A (ja) 1993-02-24 1993-02-24 スピーカ装置

Publications (2)

Publication Number Publication Date
EP0613317A1 true EP0613317A1 (de) 1994-08-31
EP0613317B1 EP0613317B1 (de) 1998-08-05

Family

ID=12430859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940102600 Expired - Lifetime EP0613317B1 (de) 1993-02-24 1994-02-21 Lautsprechersystem

Country Status (4)

Country Link
EP (1) EP0613317B1 (de)
JP (1) JPH06253383A (de)
CA (1) CA2116178C (de)
DE (1) DE69412152T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2298758A (en) * 1995-03-09 1996-09-11 Prima Dev Ltd Transmission line enclosure
GB2333927A (en) * 1998-01-30 1999-08-04 Sony Corp Housing for an electro-acoustic transducer, e.g. loudspeaker, earphone, microphone
EP2976892A1 (de) * 2013-03-22 2016-01-27 Campobello Ltd. Akustische vorrichtung
EP2775734A3 (de) * 2013-03-07 2016-11-09 Yamaha Corporation Akustische Vorrichtung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5535284A (en) * 1994-08-03 1996-07-09 Thornhill; James A. Woofer speaker and acoustically coupled sub-woofer speaker system
KR20070006808A (ko) * 2004-04-01 2007-01-11 코닌클리케 필립스 일렉트로닉스 엔.브이. 분산형 음향 캐비넷
US8351629B2 (en) * 2008-02-21 2013-01-08 Robert Preston Parker Waveguide electroacoustical transducing
WO2011007436A1 (ja) * 2009-07-16 2011-01-20 株式会社 東芝 音響再生装置
JP6210325B2 (ja) * 2014-07-01 2017-10-11 株式会社パトライト 報知装置
JP6277314B1 (ja) * 2017-08-07 2018-02-07 勝巳 瀬戸 スピーカー装置
JP7255035B1 (ja) * 2023-01-13 2023-04-10 エムケー精工株式会社 音響装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978941A (en) * 1975-06-06 1976-09-07 Curt August Siebert Speaker enclosure
EP0336303A2 (de) * 1988-04-04 1989-10-11 Yamaha Corporation Akustischer Apparat
JPH04170298A (ja) * 1990-11-02 1992-06-17 Matsushita Electric Ind Co Ltd スピーカシステム
JPH1068099A (ja) * 1996-08-28 1998-03-10 Honda Motor Co Ltd リバース塗装方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978941A (en) * 1975-06-06 1976-09-07 Curt August Siebert Speaker enclosure
EP0336303A2 (de) * 1988-04-04 1989-10-11 Yamaha Corporation Akustischer Apparat
JPH04170298A (ja) * 1990-11-02 1992-06-17 Matsushita Electric Ind Co Ltd スピーカシステム
JPH1068099A (ja) * 1996-08-28 1998-03-10 Honda Motor Co Ltd リバース塗装方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 285 (E - 780) 29 June 1989 (1989-06-29) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 475 (E - 1273) 2 October 1992 (1992-10-02) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2298758A (en) * 1995-03-09 1996-09-11 Prima Dev Ltd Transmission line enclosure
GB2298758B (en) * 1995-03-09 1999-05-26 Prima Dev Ltd Loudspeaker systems and enclosures
GB2333927A (en) * 1998-01-30 1999-08-04 Sony Corp Housing for an electro-acoustic transducer, e.g. loudspeaker, earphone, microphone
GB2333927B (en) * 1998-01-30 2000-03-29 Sony Corp Electro-acoustic transducer
US6356643B2 (en) 1998-01-30 2002-03-12 Sony Corporation Electro-acoustic transducer
EP2775734A3 (de) * 2013-03-07 2016-11-09 Yamaha Corporation Akustische Vorrichtung
EP2976892A1 (de) * 2013-03-22 2016-01-27 Campobello Ltd. Akustische vorrichtung
US9716940B2 (en) 2013-03-22 2017-07-25 Flare Audio Technologies Limited Acoustic device
GB2513986B (en) * 2013-03-22 2021-02-17 Flare Audio Tech Limited An acoustic device
EP2976892B1 (de) * 2013-03-22 2022-05-04 Flare Audio Technologies Limited Akustische vorrichtung

Also Published As

Publication number Publication date
DE69412152T2 (de) 1998-12-10
EP0613317B1 (de) 1998-08-05
JPH06253383A (ja) 1994-09-09
DE69412152D1 (de) 1998-09-10
CA2116178C (en) 2000-04-11
CA2116178A1 (en) 1994-08-25

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