EP1732351A1 - Enceinte acoustique et appareil correspondant - Google Patents

Enceinte acoustique et appareil correspondant Download PDF

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Publication number
EP1732351A1
EP1732351A1 EP05291248A EP05291248A EP1732351A1 EP 1732351 A1 EP1732351 A1 EP 1732351A1 EP 05291248 A EP05291248 A EP 05291248A EP 05291248 A EP05291248 A EP 05291248A EP 1732351 A1 EP1732351 A1 EP 1732351A1
Authority
EP
European Patent Office
Prior art keywords
loudspeakers
passive
loudspeaker
enclosure
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.)
Withdrawn
Application number
EP05291248A
Other languages
German (de)
English (en)
Inventor
Cornelius Sperle
Michel Evenisse
Auguste Bremaud
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.)
TCL Thomson Electronics Europe SAS
Original Assignee
TCL Thomson Electronics Europe SAS
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 TCL Thomson Electronics Europe SAS filed Critical TCL Thomson Electronics Europe SAS
Priority to EP05291248A priority Critical patent/EP1732351A1/fr
Priority to PCT/EP2006/063035 priority patent/WO2006131553A1/fr
Publication of EP1732351A1 publication Critical patent/EP1732351A1/fr
Withdrawn legal-status Critical Current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
    • H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
    • H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm 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
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Definitions

  • the present invention concerns acoustic systems, and more specifically acoustic system that are small and present good efficiency in bass frequencies.
  • the invention is advantageously applied to devices including a small location for such an acoustic system (for example devices fitted with a flat screen).
  • an acoustic system for a device including a small location for it includes generally a boomer, one or several active loudspeakers for medium and high frequencies and, sometimes, one passive loudspeaker.
  • Such a system has the drawbacks that either the big volume of its loudspeakers does not suit well to their destination device or they have a bad sound quality, especially in bass frequencies.
  • the invention aims at providing a small acoustic system, that is well adapted to devices including a small location for the acoustic system (e.g. devices including a flat screen such as plasma or LCD screen) and that has a good sound quality especially in bass frequencies.
  • the invention proposes an acoustic enclosure comprising at least one active loudspeaker and at least two passive loudspeakers that have different resonant frequencies and are located in the same resonant room as at least one active loudspeaker.
  • the passive loudspeakers are activated by active loudspeakers and emphasize different frequencies, so that the sound produced by the enclosure has a good level in a large spectrum of frequencies.
  • the resonant frequencies of at least two of said passive loudspeakers are separated by at least one third of octave.
  • the resonant frequencies of at least two of said passive loudspeakers are equal to or lower than 200Hz.
  • the mass of membranes, the emissive surface and/or the suspension of at least two passive loudspeakers is different.
  • the enclosure is a boomer.
  • the enclosure comprises at least two active loudspeakers with different acoustic responses.
  • the enclosure comprises at least three passive loudspeakers that are located in the same room as at least one active loudspeaker.
  • At least one passive loudspeaker and one active loudspeaker are located in the same room and on the same side and/or on opposite side of the enclosure.
  • the total emissive surface of passive loudspeakers is larger than the total emissive surface of active loudspeakers located in the same room.
  • the invention concerns also a device with a flat screen comprising an acoustic enclosure as disclosed above, the acoustic enclosure producing a good sound and being well adapted to small location that is available for an enclosure in a flat screen device.
  • Figures 1 and 2 present a television set 1 including an acoustic system according to the invention, respectively in front and rear view.
  • the television set 1 comprises:
  • the control part 18 comprises electronic means to adapt and/or and/or acoustic signal to be provided to the enclosures 10 and 11. Connections that enable the transmission of an analog acoustic signal from the control part 18 to the enclosures 10 and 11 are made of wires and dedicated connectors and are not represented on figure 2 for clarity reasons.
  • the acoustic enclosures 10 and 11 are maintained on the TV cabinet through foam parts that absorb vibrations and are positioned on opposite end surfaces of the enclosures. These foam parts are respectively inserted in rigid guides 14 to 17 of the TV set cabinet. Then, the acoustic enclosures 10 and 11 are easy to position in the cabinet during manufacturing operations and the links between the enclosures 10 and 11 and the cabinet remain soft, so that vibrations are efficiently absorbed.
  • a protection grid in front of the enclosures 10 and 11 is assumed to be transparent on figures 1 and 2, also for clarity reasons.
  • Figures 3 and 4 represent a perspective view of the acoustic enclosure 11, respectively from the front and rear.
  • acoustic enclosure 11 and 10 are the same, mainly for cost and maintenance reasons.
  • the acoustic enclosure 11 comprises:
  • Active loudspeakers 311 and 312 and passive loudspeakers 315 and 316 are located in the same resonant room, so that passive loudspeakers 315 and 316 are controlled by active loudspeakers 311 and 312.
  • Loudspeaker 311 dedicated to bass frequencies is connected to the connector 321.
  • Loudspeaker 312 dedicated to bass and medium frequency and tweeter 310 are connected in parallel to connector 322, the tweeter 310 being fed with a high-pass filtered signal (a high-pass filter being connected to the input of the tweeter 310).
  • Loudspeaker 311 and 312 are preferably the same 8 ⁇ loudspeakers (at bass and medium frequencies). At bass and medium frequencies, the impedance of tweeter 310 is very big. At higher frequencies, the impedance of tweeter 310 is 8 ⁇ and the impedance of loudspeaker 312 is very high (eg bigger than 20 ⁇ ).
  • loudspeaker 311 and 312 are fed with analog signals, that are amplified independently with two different amplifiers (each providing a power equal to or greater than 10 Watts rms) the output impedance of each amplifiers being adapted to the input impedance of corresponding loudspeakers.
  • a low-pass filter filters the input of loudspeaker 311 to enhance the bass frequencies, whereas the low frequencies are preferably not filtered at the input of loudspeaker 312, so that loudspeaker 312 covers both bass and medium frequencies.
  • the filter can be implemented before or after the corresponding amplifier.
  • the bi-amplification of the two speakers 311 and 312 enables a gain of 6dB all over (even with small bass loudspeaker (typically of diameter lower than 60 mm, this size corresponding more usually to midrange and treble frequencies)), compared to a system including a single amplifier and two 16 ⁇ speakers in parallel. Additionally, it enables to "shape" the response curve to the needs of the acoustics and to overcome, at least partially, the drawbacks of the active speakers (eg low level in low frequencies, bad response curve) or the too small enclosure.
  • Such a system provide a better result than some bigger enclosures, higher SPL (or "Sound Pressure Level", ie sound level at a given frequency) at low frequencies and potentially more bass (front and back response), than other acoustic enclosures which has more than the double volume.
  • SPL Sound Pressure Level
  • bass front and back response
  • the acoustic amplifiers and filters are preferably in the control part 18. Indeed, according to a variant of the invention, they can be implemented inside the enclosures 10 and/or 11.
  • bass loudspeakers 311 of enclosures 10 and 11 have a 4 ⁇ impedance and are fed with the same 8 ⁇ amplifiers.
  • the bass/medium loudspeakers 312 of enclosures 10 and 11 have a 8 ⁇ impedance and are fed with two different 8 ⁇ amplifiers.
  • the enclosure 11 has, for example, the following features:
  • the depth and the height of parts 31 and 32 is advantageously less than 60 mm to be compliant with devices with a small location for acoustic system, especially devices with flat screen.
  • the frequency response of passive loudspeakers 315 and 316 is advantageously not the same. This can be achieved, for instance, as follows:
  • the emissive surface of the passive loudspeakers is rather big. More generally, the surface of membrane of each passive loudspeaker is equal or larger the surface of membrane of each active loudspeaker and preferably equal or larger than 1.5 times the surface of membrane of each active loudspeaker and more preferably equal or larger than twice the surface of membrane of each active loudspeaker.
  • the compliance (or Cms that equals the inverse of the stiffer or, the shift of membrane relative to an applied force) is advantageously comprised between 0.5 and 1.2 mm/N.
  • the resonant frequencies of passive loudspeakers is not the same. Their difference is preferably comprised between 1/3 octave and one octave: ie, the higher frequency is equal or greater than 4/3 times the lower frequency and equal or lower than twice the lower frequency. This enables to enlarge the frequency band, that it reproduced by passive loudspeakers.
  • Figure 5 illustrates the frequency response (amplitude vs frequencies) of different configurations of enclosures comprising two passives loudspeakers, (these responses have been obtained by experiments or simulations) :
  • the passive loudspeakers are the same except the mass of their membrane (in particular they have the same size around 50mmx90mm and the same suspension). If the diameter of loudspeaker is larger, the SPL and/or the high pass cut of the corresponding loudspeaker is or are increased.
  • the embodiment corresponding to a mass equal to 7g added on one of passive loudspeaker (curve 51) offers a good compromise between the response in low frequencies and the flatness of the response between 100 and 200 Hz.
  • Figures 6 and 7 represent a perspective view of a boomer enclosure 6 (or bass acoustic enclosure used for frequencies below 200 Hz) according to a variant of the invention, respectively from the front and rear.
  • the enclosure 6 and two additional medium and high frequencies enclosures can replace the enclosures 10 and 11 of set 1 (the enclosure 6 fit well to device of big size).
  • Medium and high frequencies enclosures can be implemented in the lower part, higher part, or side parts of the set and are not described.
  • the bass acoustic enclosure 6 comprises:
  • Active loudspeaker 61 and passive loudspeakers 62 to 64 are located in the same resonant room, so that passive loudspeakers 62 to 64 are controlled by active loudspeaker 61.
  • the loudspeaker 61 is a 8 ⁇ loudspeaker linked to the connector 65. Thus, it is fed with analog signal, that is amplified preferably with a dedicated amplifier (providing a power equal to or greater than 10Watts rms) and filtered with a low-pass filter.
  • the acoustic amplifier and filter are preferably in the control part 18. Indeed, according to a variant of the invention, they can be implemented inside the enclosure 6.
  • the enclosure 6 has, for example, the following features:
  • the enclosure 6 has a net volume, which is below two litres.
  • the depth and the height of parts 31 and 32 is advantageously less than 100 mm to be compliant with devices with flat screen.
  • the frequency response of passive loudspeakers 62 to 64 is not the same. This can be achieved, for instance, as follows:
  • the emissive surface of the passive loudspeakers is rather big. More generally, when there are two, three or more passive loudspeakers, according to the invention, the total surface of membranes of passive loudspeakers is equal or larger the total surface of membranes of active loudspeakers and preferably equal or larger than 1.5 times the total surface of membranes of active loudspeakers and more preferably twice the total surface of membranes of active loudspeakers.
  • Figure 8 illustrates the frequency response (amplitude vs frequencies) of different configurations of enclosures.
  • Curves 80 to 82 correspond respectively to enclosures having three, two and one passive loudspeakers and same active loudspeakers (having a resonant frequency equal to 75 Hz).
  • an enclosure with three different passive loudspeakers provides a better response than similar size enclosures with less passive loudspeakers.
  • Figures 9 and 10 represent a perspective view of boomer enclosure 7, which is a variant of the boomer enclosure 6, respectively from the front and rear.
  • the bass acoustic enclosure 6 comprises:
  • the major difference between the enclosures 6 and 7 is that the passive loudspeakers are not on the same face than the active loudspeaker, that enables to have more place for passive loudspeakers.
  • Active loudspeaker 71 and passive loudspeakers 72 to 74 are located in the same resonant room, so that passive loudspeakers 72 to 74 are controlled by active loudspeaker 71.
  • the active loudspeaker 71 and passive loudspeakers 72 to 74 are similar to loudspeaker 61 and 62 to 64. In a variant, passive loudspeaker 72 to 74 can be longer than loudspeaker 62 to 64.
  • the invention concerns different devices having a small location for acoustic system (especially devices including a screen (especially a flat screen)) such as TV sets, computers, radio receiver, Hi-Fi acoustic enclosures, audio system for cars or transportation means.
  • acoustic system especially devices including a screen (especially a flat screen)
  • TV sets, computers, radio receiver, Hi-Fi acoustic enclosures, audio system for cars or transportation means such as TV sets, computers, radio receiver, Hi-Fi acoustic enclosures, audio system for cars or transportation means.
  • the invention is compliant with other shapes of enclosures. Especially, the invention is not limited to rectangular enclosures and can be adapted to enclosures that have one or several curved sides. The invention is also compliant with enclosures that has different sizes (especially, enclosures with are deeper or higher than disclosed enclosures). Moreover, the invention is compliant with enclosure comprising bigger active loudspeakers.
  • the invention is compliant with acoustic enclosures having at least two passive loudspeakers that are all positioned on one side of the enclosure (as illustrated in figures) or that are positioned on each side of the enclosure (eg. one or two passive loudspeaker are on one side of the enclosure and other passive loudspeaker(s) is or are on the other side).
  • Positioning of passive loudspeakers relatively to the side of enclosure (same side or different sides for passive loudspeakers) or to the side of active loudspeaker (same or opposite side) can be determined according to the dimension or volume constraints associated to the device that is to implement the acoustic enclosures.
  • the invention is also compliant with acoustic enclosures having at least two active loudspeakers (eg 2, 3, 4 or more loudspeakers) that are all positioned on one side of the enclosure (as illustrated in figures) or that are positioned on each side of the enclosure. More generally, when there are several passive loudspeakers, according to the invention, the total surface of membranes of passive loudspeakers is equal or larger the total surface of membranes of active loudspeakers and preferably equal or larger than 1.5 times the total surface of membranes of active loudspeakers and more preferably twice the total surface of membranes of active loudspeakers (eg. the total surface of membranes (or active surface) of passive loudspeakers is twice or three time the active surface of active loudspeakers).
  • active loudspeakers eg 2, 3, 4 or more loudspeakers
  • the invention is also compliant with acoustic systems that have an enclosure comprising several resonant rooms, at least one room comprising at least two passive loudspeakers, and at least one active loudspeaker, the passive loudspeaker having different resonant frequencies.
  • the active loudspeakers entail resonance of passive loudspeakers, that have two different resonant frequencies. That can be obtained by an air communication inside one room comprising active and passive loudspeakers with specific resonant frequencies.

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  • 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)
EP05291248A 2005-06-09 2005-06-09 Enceinte acoustique et appareil correspondant Withdrawn EP1732351A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05291248A EP1732351A1 (fr) 2005-06-09 2005-06-09 Enceinte acoustique et appareil correspondant
PCT/EP2006/063035 WO2006131553A1 (fr) 2005-06-09 2006-06-08 Enceinte acoustique et dispositif correspondant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05291248A EP1732351A1 (fr) 2005-06-09 2005-06-09 Enceinte acoustique et appareil correspondant

Publications (1)

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EP1732351A1 true EP1732351A1 (fr) 2006-12-13

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EP05291248A Withdrawn EP1732351A1 (fr) 2005-06-09 2005-06-09 Enceinte acoustique et appareil correspondant

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EP (1) EP1732351A1 (fr)
WO (1) WO2006131553A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3174310A4 (fr) * 2014-07-22 2018-02-28 Shen Zhen Neusound Co. Ltd. Téléviseur à boîtier son à résonance de membrane double intégrée

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772466A (en) * 1970-11-25 1973-11-13 Romen Kg Kdt Loud speaker system
US4005278A (en) * 1974-09-16 1977-01-25 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Headphone
JPS63268396A (ja) * 1987-04-27 1988-11-07 Matsushita Electric Ind Co Ltd 低域再生スピ−カシステム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772466A (en) * 1970-11-25 1973-11-13 Romen Kg Kdt Loud speaker system
US4005278A (en) * 1974-09-16 1977-01-25 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Headphone
JPS63268396A (ja) * 1987-04-27 1988-11-07 Matsushita Electric Ind Co Ltd 低域再生スピ−カシステム

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 092 (E - 722) 3 March 1989 (1989-03-03) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3174310A4 (fr) * 2014-07-22 2018-02-28 Shen Zhen Neusound Co. Ltd. Téléviseur à boîtier son à résonance de membrane double intégrée

Also Published As

Publication number Publication date
WO2006131553A1 (fr) 2006-12-14

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