EP0456416B1 - Loudspeaker system - Google Patents

Loudspeaker system Download PDF

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Publication number
EP0456416B1
EP0456416B1 EP19910303981 EP91303981A EP0456416B1 EP 0456416 B1 EP0456416 B1 EP 0456416B1 EP 19910303981 EP19910303981 EP 19910303981 EP 91303981 A EP91303981 A EP 91303981A EP 0456416 B1 EP0456416 B1 EP 0456416B1
Authority
EP
European Patent Office
Prior art keywords
space
port
cabinet
partition
hole
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
EP19910303981
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0456416A3 (en
EP0456416A2 (en
Inventor
Serikawa Mitsuhiko
Naono Hiroyuki
Masayuki Hara
Atsushi Yukiyoshi
Syouji Tanaka
Masaji Hotta
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 EP0456416A2 publication Critical patent/EP0456416A2/en
Publication of EP0456416A3 publication Critical patent/EP0456416A3/en
Application granted granted Critical
Publication of EP0456416B1 publication Critical patent/EP0456416B1/en
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
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
    • 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
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers

Definitions

  • This invention relates to a loudspeaker system which is small but can reproduce a powerful sound of deep-low tone.
  • FIG. 6 shows a cross section of this conventional cascade bass-reflex loudspeaker system.
  • 6 1 is a cabinet of a loudspeaker system
  • 2 is a speaker unit
  • 3 is a partition which divides the internal space of the aforesaid cabinet 1 into two spaces
  • 4 is the first space divided by the aforesaid partition 3
  • 5 is a second space
  • 6 is a first port installed on the aforesaid partition 3
  • 7 is a second port installed on the back of the aforesaid cabinet 1.
  • Fig. 7 is an equivalent circuit of the loud speaker system shown in Fig. 6.
  • Z represents an impedance comprising a mass attributable to the speaker unit 2, a compliance, and a resistance
  • C1 does a compliance at the first space 4
  • P1 does a mass at the first port 6
  • C2 does a compliance at the second space 5
  • P2 does a mass at the second port 7.
  • the first space 4 and port 6 and the second space 5 and port 7, namely, two compliances and two masses additionally provide a system of two degrees of freedom possessing two antiresonant frequencies f1 and f2.
  • Fig. 8 shows that this gives a favorable sound pressure level-frequency characteristic in the frequency ranges around f1 and from f1 to f2 by equalizing the phases of the sound radiated from the diaphragm of the speaker unit and the sound radiated from the second port 7 as in the case with a simple bass-reflex-type loudspeaker system.
  • a problem is, however, that, around the second antiresonant frequency f2, the phase of the sound radiated from the second port 7 is inverted again with increasing level of sound to cause a large dip in the frequency response around f2 due to the interference with the sound radiated from the aforesaid diaphragm.
  • This type of system can, therefore, be used as a super woofer system dedicated for the reproduction of deep-low tone, but is hardly applicable as a loudspeaker system to reproduce the entire frequency range.
  • JP-A-1254097 discloses a speaker system in which an acoustic filter is connected in cascade to a bass-reflex speaker system.
  • the bass-reflex speaker system (a Helmholtz resonator) is constituted by a first space containing the speaker unit and a port. A second space having a hole is connected to the exit of the port to constitute the acoustic filter.
  • US-A-2368639 discloses a speaker system in which a partition having a hole is provided in the cabinet to form a closed space in the cabinet.
  • the speaker box of the entire speaker system is not a Helmholtz resonator, and thus the entire speaker system is not a bass-reflex speaker system.
  • An object of this invention is to realize a small and deep-low tone-reproducible loudspeaker system for the reproduction of the entire frequency range by eliminating the above-mentioned dip in the sound pressure level-frequency characteristic.
  • a loudspeaker system of this invention is a cascade bass-reflex loudspeaker system which is additionally provided with a second partition on which at least one hole or port is further installed to construct a third space.
  • the sizes of the aforesaid third space and hole or port are adjusted so that the resonant frequency of a Helmholtz resonator composed of the aforesaid third space and a hole or port installed on the aforesaid second partition may coincide with the above-mentioned frequency f2.
  • Fig. 1 shows a cross section of a loudspeaker system in the first embodiment of this invention.
  • Fig. 2 shows an equivalent circuit of the system.
  • Fig. 3 shows a specific example of the sound pressure level-frequency characteristic.
  • Fig. 4 shows a cross section of a loudspeaker system in the second embodiment of this invention.
  • Fig. 5 shows a cross section of a loudspeaker system in the third embodiment of this invention.
  • Fig. 6 shows a cross section of a conventional loudspeaker system.
  • Fig. 7 shows an equivalent circuit of the system.
  • Fig. 8 shows a specific example of the sound pressure level-frequency characteristic.
  • Fig. 1 shows a cross section of a loudspeaker system in the first embodiment of this invention
  • Fig. 2 does an equivalent circuit of the system
  • Fig. 3 does a specific example of the sound pressure level-frequency characteristic.
  • a cabinet 1 a speaker unit 2, a partition 3, a first space 4, a second space 5, a first port 6, and a second port 7 are the same as each of those in Fig. 6.
  • 8 is a second partition provided within the second space 5
  • 9 is a third space constructed by the second partition 8
  • 10 is a hole installed on the second partition to compose a Helmholtz resonator with the third space.
  • Z represents an impedance comprising a mass attributable to the speaker unit 2, a compliance, and a resistance
  • C1 does a compliance at the first space 4
  • P1 does a mass at the first port 6
  • C2 does a compliance at the second space 5
  • P2 does a mass at the second port 7
  • C3 does a compliance at the third space 9
  • P3 does a mass at the hole 10.
  • a simple cascade bass-reflex loudspeaker system is additionally provided with a system of two degrees of freedom possessing two antiresonant frequencies f1 and f2 by the first space 4 and port 6 and the second space 5 and port 7 in Fig. 1, namely, two compliances C1 & C2 and two masses P1 and P2 in Fig. 2.
  • the phase of the sound radiated from the second port 7 is inverted again with increasing level of sound to cause a large dip in the frequency response around f2 due to the interference with the sound radiated from the aforesaid diaphragm.
  • the volume of the aforesaid third space 9 and/or the size of the hole 10 is adjusted so that the resonant frequency of a Helmholtz resonator composed of the third space 9 and the hole 10 may be almost the same as the aforesaid second antiresonant frequency f2, the second antiresonance is absorbed by the resonance of a Helmholtz resonator composed of P3 and C3 in Fig. 2. This reduces the vibration of air within the second port, thereby substantially improving the dip in the sound pressure level-frequency characteristic around f2 as shown in Fig. 3.
  • a dip in the sound pressure level-frequency characteristic around the second antiresonant frequency can be substantially improved for better reproduction quality by providing a cascade bass-reflex-type loudspeaker system with a third space and a hole and, then, adjusting the volume of the aforesaid third space and the size of the hole so that the resonant frequency of a Helmholtz resonator composed of the above space and hole provided may be almost the same as the second antiresonant frequency f2.
  • Fig. 4 shows a cross section of a loudspeaker system in the second embodiment of this invention.
  • Fig. 4 is different from Fig. 1 in that a third port 11 in place of the hole 10 is installed on the second partition 8. Even such a structure allows a Helmholtz resonator composed of the third space 9 and the third port 11 to function in a similar manner to that in the first embodiment, thereby improving the dip in the sound pressure level-frequency characteristic around the second antiresonant frequency f2. Moreover, the resonant frequency of a Helmholtz resonator can be easily established around f2 simply by adjusting the length of the third port 11.
  • Fig. 5 shows a cross section of a loudspeaker system in the third embodiment of this invention.
  • Fig. 5 is different from Fig. 4 in that a port wall 12 composing a second port 7 is so structured that the cross-sectional area of the aforesaid port may increase gradually toward outside the cabinet 1.
  • a port wall 12 composing a second port 7 is so structured that the cross-sectional area of the aforesaid port may increase gradually toward outside the cabinet 1.
  • More than one holes or ports may be installed on the second partition in the above first, second, and third embodiments. More than one third spaces may also be constructed by providing more than one second partitions. Furthermore, the second partition may be provided in other manners than that to divide the space within the cabinet sideways such as by dividing it vertically.

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)
EP19910303981 1990-05-11 1991-05-02 Loudspeaker system Expired - Lifetime EP0456416B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP121625/90 1990-05-11
JP2121625A JP2653219B2 (ja) 1990-05-11 1990-05-11 スピーカシステム

Publications (3)

Publication Number Publication Date
EP0456416A2 EP0456416A2 (en) 1991-11-13
EP0456416A3 EP0456416A3 (en) 1992-11-25
EP0456416B1 true EP0456416B1 (en) 1995-08-02

Family

ID=14815896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910303981 Expired - Lifetime EP0456416B1 (en) 1990-05-11 1991-05-02 Loudspeaker system

Country Status (3)

Country Link
EP (1) EP0456416B1 (ja)
JP (1) JP2653219B2 (ja)
DE (1) DE69111683T2 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009011051A1 (de) 2009-02-28 2010-09-09 Thomas Scherer Akustisches System sowie Laufzeitleitung, insbesondere für ein akustisches System
WO2014048207A1 (en) * 2012-09-27 2014-04-03 Shenzhen Byd Auto R&D Company Limited Dock with sound box

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0575797U (ja) * 1992-03-24 1993-10-15 株式会社河合楽器製作所 電子鍵盤楽器のスピーカ装置
US5740259A (en) * 1992-06-04 1998-04-14 Bose Corporation Pressure wave transducing
JPH06245286A (ja) * 1993-02-19 1994-09-02 Sony Corp スピーカ
GB2295518B (en) * 1994-12-23 1998-08-05 Graeme John Huon Loudspeaker system incorporating acoustic waveguide filters and method of construction
DE19859046A1 (de) * 1998-12-21 2000-07-20 Norbert Schaefer Tiefton-Membranlautsprecher
US7614479B2 (en) * 2004-05-12 2009-11-10 Jan Plummer Sound enhancement module
WO2010137988A1 (en) * 2009-05-29 2010-12-02 Leiv Eiriksson Nyskapning As Loudspeaker arrangement
US8699738B2 (en) 2010-12-03 2014-04-15 Panasonic Corporation Speaker system with resonance frequency approximately identical to the peak frequency of the sound pressure
JP6082676B2 (ja) * 2012-09-28 2017-02-15 和正 山田 音波増幅器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2368639A (en) * 1943-09-02 1945-02-06 Florence Carter Tone chamber
JPS5789393A (en) * 1980-11-17 1982-06-03 Bose Corp Controller for low end response for loudspeaker system
JPS5813792U (ja) * 1981-07-20 1983-01-28 シャープ株式会社 スピ−カキヤビネツト
JPH01254097A (ja) * 1988-04-04 1989-10-11 Yamaha Corp 音響装置
US5109422A (en) * 1988-09-28 1992-04-28 Yamaha Corporation Acoustic apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009011051A1 (de) 2009-02-28 2010-09-09 Thomas Scherer Akustisches System sowie Laufzeitleitung, insbesondere für ein akustisches System
WO2014048207A1 (en) * 2012-09-27 2014-04-03 Shenzhen Byd Auto R&D Company Limited Dock with sound box

Also Published As

Publication number Publication date
DE69111683D1 (de) 1995-09-07
JPH0417497A (ja) 1992-01-22
EP0456416A3 (en) 1992-11-25
EP0456416A2 (en) 1991-11-13
DE69111683T2 (de) 1996-04-04
JP2653219B2 (ja) 1997-09-17

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