EP2023672A1 - Systeme de haut-parleur - Google Patents

Systeme de haut-parleur Download PDF

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Publication number
EP2023672A1
EP2023672A1 EP07744260A EP07744260A EP2023672A1 EP 2023672 A1 EP2023672 A1 EP 2023672A1 EP 07744260 A EP07744260 A EP 07744260A EP 07744260 A EP07744260 A EP 07744260A EP 2023672 A1 EP2023672 A1 EP 2023672A1
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EP
European Patent Office
Prior art keywords
speaker
channel
listener
signal
channel speaker
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Withdrawn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
EP07744260A
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German (de)
English (en)
Inventor
Takahiro c/o Panasonic Corp. IPROC HAYAKAWA
Junichi c/o panasonic Corp. IPROC MATSUDA
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Panasonic Corp
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Panasonic Corp
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Filing date
Publication date
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Publication of EP2023672A1 publication Critical patent/EP2023672A1/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to a speaker system that includes two pairs of speaker units each including at least two speakers.
  • a conventional speaker system includes, for example, an L channel speaker unit, an R channel speaker unit and a center speaker unit (for example, see Patent Document 1).
  • Each of the above three speaker units is arranged in the center of positions ahead of the driver' s seat and passenger seat of a vehicle.
  • the L channel speaker unit is directed toward a direction in which the directivity axis of the L channel speaker unit is rotated counterclockwise in the horizontal direction with respect to the traveling direction of the vehicle and in which the directivity axis is inclined at a predetermined angle to the vertical direction with respect to the traveling direction of the vehicle.
  • the R channel speaker unit is directed toward a direction in which the directivity axis of the R channel speaker unit is rotated clockwise in the horizontal direction with respect to the traveling direction of the vehicle and in which the directivity axis is inclined at a predetermined angle in the vertical direction with respect to the traveling direction of the vehicle.
  • the center speaker unit outputs an -L-R signal obtained by adding an -L signal which is a reverse phase signal of an L channel signal and an -R signal which is a reverse phase signal of the R channel signal.
  • a speaker system includes: a first speaker unit configured to include first and second speakers, the first and second speakers being arranged in symmetry each other with respect to a first reference plane including a first listening point; and a second speaker unit configured to include third and fourth speakers, the third and fourth speakers being arranged in symmetry each other with respect to a second reference plane including a second listening point, and to be arranged in symmetry with the first speaker unit with respect to a predetermined median plane.
  • FIG.1 shows an interior of a vehicle mounting the speaker system from above, according to the embodiment of the present invention and FIG.2 shows the lateral side of the driver's seat.
  • a speaker system 100 includes a first R channel speaker 101, a second R channel speaker 102, a the third L channel speaker 103 and a fourth L channel speaker 104 that each output sound of the middle and high frequency band (about 200 Hz to 20 kHz).
  • the first R channel speaker 101 is substantially arranged in front of the driver's seat of the vehicle (for example, in/on a dashboard 200) and outputs sound based on an in-phase signal of the R channel signal (hereinafter referred to as "in-phase signal (R)") from a sound source.
  • in-phase signal (R) an in-phase signal of the R channel signal
  • the second R channel speaker 102 is arranged in a location in symmetry with the first R channel speaker 101 with respect to the first virtual plane and is substantially arranged in front of the driver's seat, and outputs sound based on the reverse phase signal (hereinafter referred to as "reverse phase signal (R)”) that inverts has a reverse phase with respect to above in-phase signal (R).
  • reverse phase signal R
  • this first reference plane c is parallel or substantially parallel to longitudinal median plane e of the vehicle, includes a listening point (hereinafter referred to as “the first listening point") for the listener sitting in the driver's seat and passes the center of the first and second R channel speakers 101 and 102. Further, in the present embodiment, the first listening point is exemplarily determined in advance around the head of the listener sitting in the driver's seat.
  • the third L channel speaker 103 is substantially arranged in front of the front passenger seat next to the driver's seat (for example, in/on dashboard 200), and outputs sound based on the in-phase signal of the L channel signal (hereinafter referred to as "in-phase signal (L)”) from the same sound source as above.
  • in-phase signal (L) the in-phase signal of the L channel signal
  • the fourth L channel speaker 104 is arranged in a location in symmetry with the third L channel speaker 103 with respect to the second virtual plane and is substantially arranged in front of the front passenger seat, and outputs sound based on the reverse phase signal (hereinafter “reverse phase signal (L)”) that has a reverse phase with respect to the above in-phase signal (L).
  • reverse phase signal (L) the reverse phase signal that has a reverse phase with respect to the above in-phase signal (L).
  • this second reference plane d is parallel or substantially parallel to the longitudinal median plane e of the vehicle, includes the listening point for the listener sitting in the front passenger seat (hereinafter referred to as “the second listening point") and passes the center of third and fourth L channel speakers 103 and 104. Further, in the present embodiment, the second listening point is exemplarily determined in advance around the head of the listener sitting in the front passenger seat.
  • the first R channel speaker 101 outputs sound based on the in-phase signal (R) and the second R channel speaker 102 outputs sound based on the reverse phase signal (R). Consequently, above and near the first reference plane c, sound based on the in-phase signal (R) and sound based on the reverse signal (R) cancel each other and the listener sitting in the driver's seat feels like sound does not come from the front. Given that the same phenomenon occurs in the first L channel speaker 103 and the second L channel speaker 104, the listener sitting in the front passenger seat feels like sound does not come from the front of the listener.
  • the speaker system 100 includes a sound input section 110 in which a sound source composed of two-channel signal (composed of L channel and R channel), and a signal processing block 120 for applying signal processing to the two-channel signal from the sound input section 110 to generate an in-phase signal (R), a reverse phase signal (R), a in-phase signal (L) and a reverse phase signal (L).
  • the in-phase signal (R), the reverse phase signal (R), the in-phase signal (L) and the reverse phase signal (L) generated, are outputted to the first R channel speaker 101, the second R channel speaker 102, the third L channel speaker 103 and the fourth L channel speaker 104, respectively.
  • the sound input section 110 is an input terminal in which a sound source from an audio device and a speech input device, the audio device being one of a CD player, DVD player, MD player, cassette deck, radio, television receiver and semiconductor memory audio device and a speech input apparatus being a microphone, for example. Further, the sound input section 110 as such may be an audio device or speech input apparatus.
  • the speaker system 100 includes a low band (less than about 200 Hz) speaker (woofer) 180 under dashboard 200 of the driver's seat side. Further, although not shown in FIG.2 , a low band speaker 181 (see FIG.3 ) similar to the speaker 180, is provided under dashboard 200 of the front passenger seat side.
  • a low band speaker 181 similar to the speaker 180, is provided under dashboard 200 of the front passenger seat side.
  • the directivity axes of the low band speakers 180 and 181 are not directed toward the listener P1 in the driver's seat (i.e. driver) and the listener in the front passenger seat.
  • the low band speakers 180 and 181 are installed so as to be directed downward from the respective locations of installation. Consequently, the sounds having a low frequency band radiated from the low band speakers 180 and 181 do not reach the listeners directly, and, instead reflected sounds reach the listeners.
  • the first R channel speaker 101, the second R channel speaker 102, the third L channel speaker 103 and the fourth L channel speaker 104 reproduce sound of a middle and high frequency band and the low band speakers 180 and 181 reproduce sound of a low frequency band. Consequently, to the middle and high band speakers 101, 102, 103 and 104, middle and high band audio signals obtained by performing band division of the audio signal from the sound source are supplied as the in-phase signal (R), the reverse phase signal (R), the in-phase signal (L) and the in-phase signal (L), respectively. Supplied to the low band speakers 180 and 181 are the low band audio signals obtained by performing band division of the audio signal from the above sound source.
  • a pair of the first R channel speaker 101 and the second R channel speaker 102 compose speaker unit SP1 (see FIG.2 ) for the driver' s seat, and a pair of the third L channel speaker 103 and the fourth L channel speaker 104 compose a speaker unit SP2 (not shown) for the front passenger seat.
  • the speaker units SP1 and SP2 are arranged in the driver's seat side and in the front passenger seat of dashboard 200, respectively.
  • the first R channel speaker 101 and the third L channel speaker 103 compose a speaker set for the listener (i.e. driver) in the driver' s sea
  • the second R channel speaker 102 and the fourth L channel speaker 104 compose another speaker set for the listener in the front passenger seat.
  • the first R channel speaker 101 and the second R channel speaker 102 are mounted in dashboard 200 of the driver's seat side such that an opening angle and elevation angle as described below are formed.
  • the third L channel speaker 103 and the fourth L channel speaker 104 are mounted in the dashboard 200 of the front passenger seat side such that an opening angle and elevation angle described below are formed.
  • the first speaker unit SP1 is arranged in a location where an extension line of a bisector 150 of the opening angle, formed by the directivity axis of the first R channel speaker 101 and the directivity axis of the second R channel speaker 102, is parallel or substantially parallel to the longitudinal median line of the vehicle and passes the first listening point.
  • the extension line of the bisector 150 is included in the first reference plane c where the in-phase signal (R) and reverse phase signal (R) cancel each other.
  • the second speaker unit SP2 is arranged in a location where an extension line of a bisector 160 of the opening angle, formed by the directivity axis of the third L channel speaker 103 and the directivity axis of the fourth L channel speaker 104, is parallel or substantially parallel to the longitudinal median line of the vehicle and passes the second listening point.
  • the extension line of the bisector 160 is included in the second reference plane d where the in-phase signal (L) and reverse phase signal (L) cancel each other.
  • the directions of the first R channel speaker 101 and the third L channel speaker 103 are determined such that the distance of a path 151 through which sound is reflected by a right side glass 210 and reaches from the first R channel speaker 101 the right ear of the driver and the distance of a path 152 through which sound reaches from the third L channel speaker 103 directly the left ear of the driver, are equal.
  • the directions of the third L channel speaker 103 and the fourth L channel speaker 104 are determined such that the distance of a path 153 through which sound reaches from the second R channel speaker 102 directly the right ear of the listener in the front passenger seat and the distance of a path 154 through which sound is reflected by a left side glass 220 and reaches from the fourth L channel speaker 104 the left ear of the driver, are equal.
  • the first speaker unit SP1 and the second speaker unit SP2 are arranged in locations in symmetry with each other with respect to the longitudinal median plane e including the longitudinal median line of the vehicle.
  • the first R channel speaker 101, the second R channel speaker 102, the third L channel speaker 103 and the fourth L channel speaker 104 are mounted by adjusting the arrangement and directions such that the above (1) to (3) arrangement conditions are satisfied as much as possible.
  • What important matters to hearing is the requirement (2) that the distance of the path through which sound is reflected by the side glasses 210 and 220 and reaches the listener and the distance of the path through which sound reaches directly the listener are equal.
  • a method of arranging the first R channel speaker 101 and the second R channel speaker 102 and the third L channel speaker 103 and the fourth L channel speaker 104 on the dashboard 200 by shifting these speakers slightly to the right, left, forward or backward with respect to the front of the driver or the listener in the front passenger seat may be adopted.
  • a set of the first R channel speaker 101 and the second R channel speaker 102 and a set of the third L channel speaker 103 and the fourth L channel speaker 104 may not face the listener in the driver's seat (i.e. driver) and the listener in the front passenger seat, respectively.
  • the driver does not hear the sound from the first channel speaker 101 directly but hears the sound reflected by the side glass 210. Consequently, the listener feels like sound based on the in-phase signal (R) comes from a virtual image 105 of the first R channel speaker 101 at the front right outside the vehicle.
  • the listener sitting in the driver' s seat feels like the virtual image 105 of the first R channel speaker 101 is in a location in symmetry with the third L channel speaker 103 with respect to the first reference plane c.
  • the listener sitting in the driver' s seat is able to hear sound wide stereo feeling in the narrow space in the vehicle in which installation of speakers is considerably restricted.
  • the listener in the front passenger seat recognizes that there is a virtual image 106 of the fourth L channel speaker 104 at the front left outside the vehicle. Consequently, the listener sitting in the front passenger seat is able to hear sound with wide stereo feeling, like the listener sitting in the driver's seat.
  • the speaker system 100 includes the speaker unit SP1 composed of the first R channel speaker 101 that radiates the in-phase signal of the R channel signal and the second R channel speaker 102 that radiates the reverse phase signal of the R channel signal, and the speaker unit SP2 composed of the third L channel speaker 103 that radiates the in-phase signal of the L channel signal and the fourth L channel speaker 104 that radiates the reverse phase signal of the L channel signal.
  • the first R channel speaker 101 and the second R channel speaker 102 are in symmetry with respect to the first reference plane c including the listening point for the listener, and are arranged such that sound outputted from the first R channel speaker 101 is reflected by the side glass 210 and reaches to the first listening point.
  • the speaker unit SP2 is arranged in a location in symmetry with the first speaker unit SP1 with respect to the longitudinal median plane e of the vehicle, the third L channel speaker 103 and the fourth L channel speaker 104 are in symmetry with respect to the second reference plane d including the listening point for the listener and are arranged such that sound outputted from the fourth L channel speaker 104 is reflected by the side glass 220 and reaches to the second listening point.
  • first R channel speaker 101 and the third L channel speaker 103 are arranged such that the distance through which sound outputted from the first R channel speaker 101 is reflected by the side glass 210 and reaches the first listening point and the distance through which sound outputted from the third L channel speaker 103 reaches directly the first listening point, are equal.
  • the second R channel speaker 102 and the fourth L channel speaker 104 are arranged according to the same relationship between the positions of the first R channel speaker 101 and the third L channel speaker 103.
  • the listeners As described above, it is possible to provide to the listeners, the sound of the R channel and the sound of the L channel with substantially no phase difference and delay.
  • the listeners do not feel a sense of discomfort listening to audio. Further, the listener sitting in the front passenger seat is able to hear sound with wide stereo feeling like the listener sitting in the driver's seat.
  • FIG.3 shows a configuration of the signal processing block 120.
  • the signal processingblock 120 includes amplifiers 301 to 304, inverters 311 to 314, delay units 321 to 324 and band division sections 325 to 328.
  • the amplifiers 301 and 302 adjust the levels of the R and L channel signals from a sound source (not shown), respectively. Further, the amplification factors in amplifiers 301 and 302 are set such that, for example, as to the levels of the first R channel speaker 101 and the third L channel speaker 103, a listener at the first listening point hears sounds therefrom with the same levels each other.
  • the inverters 311 and 312 invert the R and L channel signals from the sound source (not shown) to adjust the level thereof, respectively.
  • the amplification factors in the amplifiers 311 and 312 are set such that, for example, as to the levels of the second R channel speaker 102 and the fourth L channel speaker 104, another listener at the second listening point hears sounds outputted therefrom with the same levels each other.
  • the amplifiers 303 and 304 adjust the level of the center signal to be applied to R channel speakers 101 and 102 from the sound source (not shown), respectively.
  • the inverters 311 and 312 invert the center signal to be applied to L channel speakers 103 and 104 to adjust the levels thereof, respectively.
  • the center signal of the present embodiment is a center channel signal used for multi-channel signals use such as 5.1 ch signals. For example, voices of actors/actresses in the center of a movie reproduced with DVD are assigned in the center channel. Alternatively, the vocal sound is assigned in the center channel in case that the source is music.
  • the output signal of the delay unit 321 is inputted to the band division section 325.
  • the band division section 325 includes ahighpass filter and lowpass filter (not shown), and the high pass filter passes the signal components of the signal inputted to the band division section 325, included in a passband of about 200 Hz to about 20 kHz.
  • the output signal of this high band filter includes the above-described in-phase signal (R) and is applied to the first R channel speaker 101.
  • the low pass filter passes the signal components of the input signal to the band division section 325, included in a passband of about 200 Hz or lower.
  • the output signal of the low pass filter is applied to the low band speaker 180.
  • the band division section 326 includes a high pass filter (not shown), and the high pass filter passes signal components of the signal inputted to the band division section 326, included in a passband of about 200 Hz to about 20 kHz.
  • the output signal of this high band filter includes the above-described reverse phase signal (R) and is applied to the second R channel speaker 102.
  • a signal in which the output signal of the amplifier 302 and the output signal of the inverter 313 are combined, is applied to the delay unit 323, given a predetermined delay in the delay unit 323 and then is inputted to the band division section 327.
  • the band division section 327 includes a high pass filter (not shown), and the high pass filter passes signal components of the signal inputted to the band division section 327, included in a passband of about 200 Hz to about 20 kHz.
  • the output signal of this high band filter includes the above-described in-phase signal (L) and is assigned to the third L channel speaker 103.
  • the output signal of the delay unit 324 is inputted to the band division section 328.
  • the band division section 328 includes a high pass filter and low pass filter (not shown), and the high pass filter passes signal components of the signal inputted to the band division section 328, included in a passband of about 200 Hz to about 20 kHz.
  • the output signal of this high band filter includes the above-described reverse phase signal (L) and is applied to the fourth L channel speaker 104.
  • the low pass filter passes signal components of the signal inputted to the band division section 328, included in the passband of about 200 Hz or lower.
  • the output signal of the low pass filter is applied to the low band speaker 181.
  • the amplifiers 301 to 304 and the inverters 311 to 314 have functions as level adjusters that adjust the output levels to the speakers by adjusting gain, and the output levels for speakers 101 to 104 can be adjusted by the amplifiers 301 to 304 and the inverters 311 to 314. In this case, the level of the center signal applied to speakers 101 to 104 can be adjusted by the amplifiers 303 and 304 and the inverters 313 and 314, respectively.
  • the in-phase signals of the center signals are added through the amplifiers 303 and 304 to the signals toward the first R channel speaker 101 and the second R channel speaker 102, respectively.
  • the reverse signal of the center signals are added through the inverters 313 and 314 to the signals toward the third L channel speaker 103 and the fourth L channel speaker 104, respectively.
  • the delay units 321 to 324 can give different phase shifts between the outputs of the first R channel speaker 101 and the second R channel speaker 102 or between the outputs of the third L channel speaker 103 and the fourth L channel speaker 104.
  • the first R channel speaker 101 that makes the in-phase sound of the R channel signal reach to the right ear of the driver via reflection using the right side glass 210
  • the second R channel speaker 102 that makes the reverse phase sound of the R channel signal reach directly to the right ear of the listener in the front passenger seat
  • the fourth L channel speaker 104 that makes the reverse phase sound of the L channel signal reach the left ear of the listener in the front passenger seat via reflection using the left side glass 220, are provided, so that the in-phase and reverse phase of the R channel signal can cancel each other in the locations of the listener in the driver's seat (driver) and the in-phase and reverse phase of the L channel signal can
  • FIG.4 is a plan view illustrating the positions of the speaker unit and the listener, employing an example of the relationship between the positions of the speaker unit SP1 of the driver's seat side and the listener P1 in the driver's seat (i.e. driver).
  • reference numeral "a” is assigned to the directivity axis of the first R channel speaker 101 that radiates sound based on the in-phase signal (R) and reference numeral “b” is assigned to the directivity axis of the second R channel speaker 102 that radiates sound based on the reverse phase signal (R).
  • Reference numeral "c” is assigned to the above-described first reference plane.
  • the positions of the speaker unit SP1 of the driver's seat side and the listener P1 in the driver's seat have been described above, the same applies to the listener in the front passenger seat and the speaker unit SP2 of the passenger seat side, that is, the in-phase signal (L) and reverse phase signal (R).
  • FIG. 5 is a schematic view showing the relationship between the direction of the speaker unit and the position of the listener, employing an example of the relationship between the positions of the speaker unit SP1 of the driver's seat side and the listener P1 in the driver's seat (i.e. driver) and the listener P2 of the passenger seat side.
  • the speaker unit SP1 of the driver's seat side is installed on the dashboard 200 shown in FIG.1 and FIG.2 .
  • the reflection plane A of FIG.5 is the side glass 210 of FIG.1 .
  • This interior space of the vehicle is defined with X and Y coordinates.
  • the distance x3 from the speaker unit SP1 of the driver's seat side there are the distance x1 from the listener P1 in the driver's seat and the distance x2 from the listener P2 in the front passenger seat.
  • Reference numeral " ⁇ " (see the dotted line) is assigned to the path through which the sound outputted from the first R channel speaker 101 composing the speaker unit SP1 (the in-phase signal (R)) is reflected by the reflection plane A and reaches the listener P1 in the driver's seat, and reference numeral " ⁇ " (see the dotted line) is assigned to the path through which the sound outputted from the second R channel speaker 102 (the reverse phase signal (R)) reaches directly the listener P2 in the front passenger seat.
  • the speaker unit SP1 and the listener P1 in the driver's seat face each other as described in FIG.4 , and, given that sounds radiated from the first R channel speaker 101 and the second R channel speaker 102 cancel each other near the first reference plane c, the listener P1 sitting in the driver's seat feels like sound does not come from the front.
  • the distance y1 to the listener P1 in the driver's seat and the distance y2 to the listener P2 in the front passenger seat are equal.
  • the distance of the path ⁇ through which sound is reflected by the reflection plane A and reaches the listener P1 in the driver's seat from the first R channel speaker 101 of the speaker unit SP1 and the distance of the path ⁇ through which sound reaches directly the listener P2 in the front passenger seat from the second R channel speaker 102 are equal.
  • Equation (4) can be derived from the condition 2 and above equations (2) and (3). Equation (5) can be obtained by applying the condition 1 to equation 4 and figuring out x3.
  • the speaker unit SP1 needs to be preferably arranged at the distance x3 which is apart from the wall A by a half of the distance between the two listeners P1 and P2.
  • the speaker unit SP1 As shown in FIG.2 , it is preferable to mount the speaker unit SP1 with the elevation angle rh such that the directivity axis a of the first R channel speaker 101 (that radiates reflected sound to the listener P1 ) of the speaker units SP1 and SP2 (in FIG.2 , speaker unit SP1 and the listener P1 are represented and shown) come at the height of the ears of the listener P1 .
  • the elevation angle rh in this way, the listener P1 would hear the sound radiated from the speakers 101 and 102 better.
  • the speaker system 100 includes the speaker unit SP1 composed of the first R channel speaker 101 that radiates the in-phase R channel signal and the second R channel speaker 102 that radiates the reverse phase R channel signal and the speaker unit SP2 composed of the third L channel speaker 103 that radiates the in-phase L channel signal and the fourth L channel speaker 104 that radiates the reverse phase L channel signal, and the first R channel speaker 101 and the second R channel speaker 102 are in symmetry with respect to the first reference plane c including the first listening point for the listener and are arranged such that sound from the first R channel speaker 101 is reflected by the side glass 210 which is the reflection plane and reaches the first listening point.
  • speakers composing the speaker units SP1 and SP2 are arranged such that the distance through which sound from one speaker is reflected by the side glasses 210 and 220 and reaches the listeningpoint for the listener and the distance through which sound from the other speaker reaches directly the listening point for the listener, are equal. Further, the listening point for the listener is arranged on the axis in which the in-phase sound signal from above one speaker and the sound signal from the above other speaker cancel each other.
  • the first and second listening points are determined in advance and are located near the heads of the listeners sitting in the driver's seat and the front passenger seat. More preferably, in case where the vehicle is a car with a right-hand steering wheel, the first listening point is set near the left ear of the listener sitting in the driver's seat and the second listening point is set near the right ear of the listener sitting in the front passenger seat. In case where the vehicle is a car with a left-hand steering wheel, the first listening point is set near the right ear of the listener sitting in the driver's seat and the second listening point is set near the left ear of the listener sitting in the front passenger seat.
  • the speaker system may be mounted in other locations in the vehicle.
  • the present invention is applicable to the speaker system arranged in, for example, a narrow room other than in the passenger compartment.
  • speaker system is used with the present embodiment for ease of description, other terms are certainly possible, including, for example, “audio system,” “audio playback system,” “speaker apparatus mounted in the vehicle” and “audio devices mounted in the vehicle.”
  • each circuit section forming the above speaker system for example, the type, number and connecting method of signal processing sections are not limited to the above described embodiment.
  • the speaker system according to the present invention is useful as a speaker system installed in the interior of the vehicle.
  • the present invention is also applicable for use in, for example, products having a plurality of speaker units. Further, the present invention is preferable for the speaker system installed in a narrow space other than in the interior of the vehicle.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Stereophonic System (AREA)
  • Stereophonic Arrangements (AREA)
EP07744260A 2006-05-31 2007-05-28 Systeme de haut-parleur Withdrawn EP2023672A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006152550A JP2007324907A (ja) 2006-05-31 2006-05-31 スピーカシステム
PCT/JP2007/060826 WO2007139066A1 (fr) 2006-05-31 2007-05-28 système de haut-parleurs

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EP2023672A1 true EP2023672A1 (fr) 2009-02-11

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EP07744260A Withdrawn EP2023672A1 (fr) 2006-05-31 2007-05-28 Systeme de haut-parleur

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EP (1) EP2023672A1 (fr)
JP (1) JP2007324907A (fr)
CN (1) CN101461256A (fr)
WO (1) WO2007139066A1 (fr)

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JP2007324907A (ja) 2007-12-13
CN101461256A (zh) 2009-06-17

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