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
  • H04R5/02—Spatial or constructional arrangements of loudspeakers

Definitions

• the present invention relates to a speaker system including two pairs of speaker units 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 (see, for example, Patent Document 1).
• the three speaker units are arranged in the front center of the driver's seat and front passenger seat, respectively.
• the L-channel speaker unit has a direction in which the direction axis of the L-channel speaker unit is rotated counterclockwise with respect to the straight direction of the vehicle in the horizontal direction, and the pointing axis is perpendicular to the direction of the vehicle.
• the direction is inclined at a predetermined angle.
• the R channel speaker unit has a direction in which the directional axis rotates in a clockwise direction from the straight traveling direction of the vehicle in the horizontal direction, and a direction in which the directional axis inclines by a predetermined angle in the traveling direction of the vehicle in the vertical direction. Is done.
• the center speaker unit outputs an L-R signal obtained by adding the L signal that is the reverse phase signal of the L channel signal and the R signal that is the reverse phase signal of the R channel signal.
• Patent Document 1 Japanese Patent Application Laid-Open No. 2004-289341
• the present invention has been made in view of efforts, and an object of the present invention is to provide a speaker system capable of providing a listening environment without giving a sense of incongruity to each of a plurality of listeners. Means for solving the problem
• a speaker system of the present invention includes first and second speakers that are arranged in plane symmetry with respect to a first reference plane that includes a first listening point.
• 1 speaker unit and 3rd and 4th speakers arranged symmetrically with respect to the second reference plane including the second listening point, and the first speaker unit with respect to a predetermined center plane
• a second speaker unit arranged in plane symmetry.
• each speaker makes it easy to provide sound without phase difference and delay toward each of the first and second listening points. Therefore, it is possible to provide a listening environment that does not give a sense of incongruity to the listeners at the first and second listening points.
• FIG. 1 is a top view of a vehicle equipped with a speaker system according to an embodiment of the present invention.
• FIG. 2 is a side view of the driver seat side of the speaker system according to the above embodiment.
• FIG. 3 is a diagram showing a configuration of a signal processing block of the speaker system according to the embodiment.
• FIG. 4 is a plan view for explaining the arrangement of the speaker unit and the listener of the speaker system according to the embodiment.
• FIG. 5 is a schematic diagram for explaining the positional relationship between the orientation of the speaker unit and the listener in the speaker system according to the embodiment.
• FIG. 1 is a top view of a vehicle equipped with a speaker system according to an embodiment of the present invention
• FIG. 2 is a side view of the driver's seat side.
• a speaker system 100 includes a first R-channel speaker 101 and a second R-channel speaker 102 that each output mid-high range (about 200 Hz to 20 kHz) sound.
• the first L-channel speaker 103 and the second L-channel speaker 104 are provided.
• the first R channel speaker 101 is disposed almost in front of the driver's seat of the vehicle (for example, in the dashboard 200 or on the dashboard 200), and is a positive phase signal (hereinafter, referred to as R channel signal from the sound source).
• R channel signal a positive phase signal
• the sound based on the positive phase signal (R), u) is output.
• the second R channel speaker 102 is disposed in front of the driver's seat at a position symmetrical to the first R channel speaker 101 with respect to the first virtual plane, It outputs sound based on the negative phase signal (hereinafter referred to as negative phase signal (R)) whose phase is inverted with respect to the normal phase signal (R).
• negative phase signal hereinafter referred to as negative phase signal (R)
• the first virtual surface is referred to as a first reference surface c.
• the first reference plane c is parallel or substantially parallel to the longitudinal center plane e of the vehicle, and includes the listening point of the listener seated in the driver's seat (hereinafter referred to as the first listening point). This is a plane passing through the centers of the first and second R channel speakers 101 and 102.
• the first listening point is predetermined around the head of the listener sitting in the driver's seat.
• the third L-channel speaker 103 is disposed almost in front of the passenger seat next to the driver's seat (for example, in the dashboard 200 or on the dashboard 200), and has the same sound source as described above. Sounds based on the positive phase signal of the L channel signal (hereinafter referred to as positive phase signal (L)) are output.
• positive phase signal (L) Sounds based on the positive phase signal of the L channel signal
• the fourth L-channel speaker 104 is positioned symmetrically with the third L-channel speaker 103 with respect to the second virtual plane, and is disposed almost in front of the passenger seat.
• the sound based on the negative phase signal (hereinafter referred to as the negative phase signal (L)) whose phase is inverted with respect to the normal phase signal (L) is output.
• the second virtual plane is referred to as a second reference plane d.
• the second reference plane d is parallel or substantially parallel to the longitudinal center plane e of the vehicle, and includes the listening point of the listener seated in the passenger seat (hereinafter referred to as the second listening point). This is a plane passing through the centers of the third and fourth L-channel speakers 103 and 104.
• the second listening point is predetermined around the head of the listener sitting in the passenger seat.
• the first R-channel speaker 101 outputs sound based on the positive phase signal (R).
• the second R channel signal 102 outputs sound based on the reverse phase signal (R). Therefore, on the first reference plane c and around it, the sound based on the positive phase signal (R) and the sound based on the negative phase signal (R) cancel each other, and the listener sitting in the driver's seat It feels like the sound is clumsy because the front force is also output.
• the same phenomenon occurs in the first L-channel speaker 103 and the second L-channel speaker 104, so that the listener sitting in the passenger seat feels as if his / her front force sound is output.
• the speaker system 100 performs signal processing on the sound input unit 110 to which an acoustic source including two-channel (L channel and R channel) signals is input, and the two channel signals from the sound input unit 110.
• the generated positive phase signal (R), negative phase signal (R), positive phase signal (L) and negative phase signal (L) are the first R channel speaker 101, the second R channel speaker 102, the first To the L channel speaker 103 and the second L channel speaker 104.
• the sound input unit 110 is a CD player, a DVD player, an MD player, a cassette deck, a radio, a television receiver, an audio device such as a semiconductor memory audio device, or a sound input device such as a microphone.
• the sound input unit 110 may be an acoustic device or a voice input device.
• the speaker system 100 includes a low-frequency (about 200 Hz or less) speaker (woofer) 180 below the dashboard 200 on the driver's seat side.
• a low-frequency speaker 181 similar to the speaker 180 is provided below the dashboard 200 on the passenger seat side.
• the directivity axes of the low-frequency speakers 180 and 181 are not directed toward the listener (driver) P1 on the driver's seat side and the listener on the passenger seat side.
• the low-frequency speakers 180 and 181 are installed facing downward from the respective installation positions. Therefore, the low-frequency sound radiated from the low-range spin forces 180 and 181 does not reach each listener directly, and the reflected sound reaches each listener.
• 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 configured to output mid-high frequency sound.
• the low-frequency speakers 180 and 181 reproduce low-frequency sound.
• the mid- and high-frequency speakers 101, 102, 103, and 104 are divided into audio signals from the same sound source, and the mid- and high-frequency audio signals are converted into normal phase signals (R), reverse phase signals (R), Supplied as a normal phase signal (L) and a negative phase signal (L), and the low-frequency speakers 180 and 181 are respectively supplied with low-frequency audio signals obtained by dividing the audio signal having the above-mentioned power source. That's true.
• the first R-channel speaker 101 and the second R-channel speaker 102 constitute a pair of speaker units SP1 on the driver's seat (see FIG. 2), and the third L-channel speaker 103 and the fourth R-channel speaker 102 A pair of the L-channel speaker 104 constitutes a speaker unit SP2 (not shown) on the passenger seat side. Therefore, the speaker units SP1 and SP2 are arranged on the driver seat side and the passenger seat side of the dashboard 200, respectively.
• the first R channel speaker 101 and the third L channel speaker 103 are speakers for the driver (driver) on the driver's seat side, and the second R channel speaker 102 and the fourth L channel speaker.
• the speaker 104 constitutes a passenger speaker on the passenger seat side.
• the first R-channel speaker 101 and the second R-channel speaker 102 are attached to the driver seat side of the dashboard 200 so as to have an opening angle and an elevation angle described below.
• the third L-channel speaker 103 and the fourth L-channel speaker 104 are attached to the passenger seat side of the dashboard 200 so as to have the following opening angle and elevation angle.
• the extension line of the bisector 150 of the opening angle formed by the directional axis of the first R channel speaker 101 and the directional axis of the second R channel speaker 102 is relative to the longitudinal center line of the vehicle.
• the first speaker unit SP1 is arranged at a position that is parallel or substantially parallel and passes through the first listening point.
• the extension line of the bisector 150 is included in the first reference plane c where the normal phase signal (R) and its reverse phase signal (R) cancel each other.
• the extension line of the bisector 160 of the opening angle formed by the directional axis of the third L-channel speaker 103 and the directional axis of the fourth L-channel speaker 104 is the vertical center line of the vehicle.
• the second speaker unit SP2 is arranged at a position that is parallel or substantially parallel and passes through the second listening point.
• the extra game of the bisector 160 is included in the second reference plane d where the normal phase signal (L) and its negative phase signal (L) cancel each other.
• the first R channel speaker 101 and the second R channel speaker 102 are disposed in front of the driver
• the third L channel speaker 103 and the fourth L channel speaker 104 are disposed in the passenger seat. Will be placed in front of the listener. Therefore, as described above, each listener sitting in the driver's seat and the passenger seat feels as if the sound is output from his / her front.
• the acoustic path 151 from the first R channel speaker 101 reflected by the right side glass 210 to reach the driver's right ear, and the third L channel speaker 103 to the driver's left ear The direction (preferably, the direction of the pointing axis) of the first R-channel speaker 101 and the third L-channel speaker 103 is determined so that the distance from the acoustic path 152 until reaching the sound source directly becomes equal.
• the acoustic path 153 from the second R-channel speaker 102 to the right ear of the passenger in the passenger seat and the fourth L-channel speaker 104 are reflected by the left side glass 220 and left to the driver's left.
• the direction (preferably, the direction of the pointing axis) of the third L-channel speaker 103 and the fourth L-channel speaker 104 is determined so that the distance from the acoustic path 154 until reaching the ear becomes equal.
• the first speaker unit SP1 and the second speaker unit SP2 are arranged at positions symmetrical to each other with respect to the longitudinal center plane e including the longitudinal center 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 R channel speaker 101 are arranged so that the arrangement conditions (1) to (3) are satisfied as much as possible. Adjust the position and orientation of the L channel speaker 104 and attach it. What is important for hearing is the condition that the distance between the reflected sound from the side glasses 210 and 220 in (2) above and the path through which the direct sound reaches the listener is equidistant. In order to prioritize this condition, 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 are operated on the dashboard 200.
• the frontal force of the front passenger or the passenger in the front passenger seat may be slightly shifted in the left / right or front / rear direction.
• 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 operated. This is possible even if the listener (driver) on the transfer side and the listener on the passenger side are not facing each other.
• R positive phase signal
• the listener seated in the driver's seat has restrictions on speaker installation. It is possible to listen to the sound of a wide stereo sense in a narrow space of a large vehicle.
• the second speaker unit SP2 is disposed at a position symmetrical to the first speaker unit SP1 with respect to the longitudinal center plane e of the vehicle, the passenger on the passenger seat side can It is recognized that there is a virtual image 106 of the fourth L-channel speaker 104 outside the vehicle ahead. Therefore, the listener seated in the passenger seat as well as the listener seated in the driver's seat can listen to a wide stereo sound.
• the speaker system 100 also has a force with the first R channel speaker 101 that radiates the positive phase of the R channel signal and the second R channel force 102 that radiates the reverse phase of the R channel signal.
• the speaker unit SP1 includes a speaker unit SP2 including a third L-channel speaker 103 that radiates the positive phase of the L-channel signal and a fourth L-channel speaker 104 that radiates the reverse phase of the L-channel signal.
• the first R-channel speaker 101 and the second R-channel speaker 102 are plane-symmetric with respect to the first reference plane c including the listener's listening point, and the first R channel The sound output from the channel speaker 101 is arranged so as to reach the first listening point after being reflected by the side glass 210.
• the speaker unit SP2 is arranged at a position symmetrical to the first speaker unit SP1 with respect to the longitudinal center plane e of the vehicle, and the third L
• the Yannel speaker 103 and the fourth L-channel speaker 104 are symmetrical with respect to the second reference plane d including the listener's listening point, and the sound output from the fourth L-channel speaker 104 is side glass. After reflecting off 220, it is arranged to reach the second listening point.
• the output acoustic force of the first R channel speaker 101 is reflected by the side glass 210, and the force reaches the first listening point.
• the first R-channel speaker 101 and the third L-channel speaker 103 are arranged at a position where the distance to reach the listening point is the same.
• the second R channel speaker 102 and the fourth L channel speaker 104 are also arranged in the same positional relationship as the first R channel speaker 101 and the third L channel speaker 103.
• FIG. 3 is a diagram showing a configuration of the signal processing block 120.
• the signal processing block 120 includes amplifiers 301 to 304, inverters 311 to 314, delay devices 321 to 324, and band dividing units 325 to 328.
• Amplifiers 301 and 302 adjust the levels of R and L channel signals from a sound source (not shown).
• the amplification degrees of the amplifiers 301 and 302 are set such that, for example, the first R channel speaker 101 and the third L channel speaker 103 have the same level of hearing at the first listening point.
• Inverters 311 and 312 invert R and L channel signals from a sound source (not shown) to adjust the level.
• the amplification degrees of the amplifiers 311 and 312 are set such that, for example, the second R channel speaker 102 and the fourth L channel speaker 104 have the same level of hearing at the second listening point.
• Amplifiers 303 and 304 adjust the level of the center signal applied to R channel speakers 101 and 102 from a sound source (not shown). Inverters 311 and 312 perform level adjustment by inverting the center signal applied to the L channel speakers 103 and 104.
• SE The center signal is a center channel signal used for multi-channels such as 5. lch. For example, the center channel records the voices of the front characters when playing a DVD movie. In the case of music sources, vocal sounds are recorded.
• a combined signal of the output signal of the amplifier 301 and the output signal of the amplifier 303 is added to the delay unit 321, and a predetermined delay is given to the combined signal by the delay unit 321.
• the output signal of the delay device 321 is input to the band dividing unit 325.
• the band division unit 325 includes a high-pass filter and a low-pass filter (not shown).
• the high-pass filter is included in the pass band of about 200 Hz to about 20 kHz in the input signal to the band division unit 325. Signal components that pass through.
• the output signal of this high-pass filter includes the above-described positive phase signal (R) and is provided to the first R channel speaker 101.
• the low-pass filter passes a signal component included in a pass band of about 200 Hz or less in the input signal to the band dividing unit 325.
• the output signal of the low-pass filter is stored in the low-frequency speaker 180.
• a composite signal of the output signal of inverter 311 and the output signal of amplifier 304 is added to delay device 322, and this composite signal is given a predetermined delay by delay device 322, and then the bandwidth is increased.
• the data is input to the dividing unit 326.
• the band division unit 326 includes a high-pass filter (not shown), and the high-pass filter passes a signal component included in a pass band of about 200 Hz to about 20 kHz in the input signal to the band division unit 326. Let The output signal of this high-pass filter includes the above-described reverse phase signal (R) and is stored in the second R channel speaker 102.
• a combined signal of the output signal of amplifier 302 and the output signal of inverter 313 is added to delay device 323, and this combined signal is given a predetermined delay by delay device 323, and then the bandwidth is increased.
• the band division unit 327 includes a high-pass filter (not shown), and the high-pass filter passes a signal component included in a pass band of about 200 Hz to about 20 kHz in the input signal to the band division unit 327.
• the output signal of this high-pass filter includes the aforementioned positive phase signal (L) and is applied to the third L-channel speaker 103.
• a combined signal of the output signal of the inverter 312 and the output signal of the inverter 314 is added to the delay unit 324, and a predetermined delay is given to the combined signal by the delay unit 324.
• the output signal of the device 324 is input to the band dividing unit 328.
• the band division unit 328 includes a high-pass filter and a low-pass filter (not shown).
• the high-pass filter is included in a pass band of about 200 Hz to about 20 kHz in the input signal to the band division unit 328. Pass included signal components.
• the output signal of this high-pass filter includes the above-described reverse phase signal (L) and is applied to the fourth L-channel speaker 104.
• the low-pass filter passes the signal component included in the pass band of about 200 Hz or less, out of the input signal to the band dividing unit 328.
• the output signal of the low-pass filter is received by the low-frequency speaker 181.
• the amplifiers 301 to 304 and the inverters 311 to 314 have a function as a level adjuster that adjusts the output level to the speaker by adjusting the gain, and the output level to each of the speakers 101 to 104 is the amplifier 301 to 304. In addition, it can be adjusted by inverters 311-314. In this case, the level of the center signal added to each of the speakers 101 to 104 can be adjusted by the amplifiers 303, 304 and the inverters 313, 314.
• the first R channel speaker 101 and the second R channel speaker 102 calculate the center signal in the positive phase via the amplifiers 303 and 304, and the third L channel speaker 103 and the second R channel speaker 102.
• the center L signal is added to the fourth L channel speaker 104 in reverse phase via inverters 313 and 314. Thereby, the sound of the center channel can be localized in front of the listener on the driver's seat (driver) and the listener on the passenger seat side.
• the outputs of the first R channel speaker 101 and the second R channel speaker 102, or the third L channel speaker 103 and the fourth L channel speaker 104 are delay units 321 to 324. It is possible to add a phase difference.
• the first R channel speaker 101 reflects the right phase of the R channel signal by the right side glass 210 and reaches the right ear of the driver, and the reverse phase of the R channel signal is set to the right ear of the passenger in the passenger seat.
• FIG. 4 is a plan view for explaining the arrangement of the speaker unit and the listener, and shows an example of the positional relationship between the driver's side spinning unit SP 1 and the driver's side listener (driver) P 1. To take.
• the speaker unit SP1 and the listener P1 on the driver's seat face each other.
• the directional axis of the first R-channel speaker 101 that emits sound based on the positive phase signal (R) is assigned a reference sign a
• the second R channel that emits sound based on the negative phase signal (R).
• the reference symbol “b” is attached to the directional axis of the speaker 102.
• the reference plane “c” is attached to the first reference plane.
• the listener P1 sitting in the driver's seat can hear sound from his front. If the output is felt as if, the condition of the following equation (1) is satisfied in order to obtain the effect.
• the speaker unit SP1 and the listener P1 do not have to face each other.
• FIG. 5 is a schematic diagram for explaining the positional relationship between the orientation of the speaker unit and the listener.
• the speaker unit SP1 on the driver's seat side, the listener (driver) on the driver's seat side P1, and the listener P2 on the passenger seat side Take the positional relationship with
• the speaker unit SP1 on the driver's seat side is installed on the dashboard 200 shown in FIGS. 5 is the side glass 210 of FIG.
• This interior space is represented by X and Y.
• the speaker unit SP1 on the driver's seat side is the distance x3 from the reflection surface A
• the distance PI is the listener PI on the driver's seat side
• the distance x2 is the listener P2 on the passenger seat side.
• the listener P1 on the driver's seat side has a distance yl with the speaker unit SP1 as a base point
• the listener P2 on the passenger side has a distance y2 with the speaker unit SP1 as a base point.
• the distance y2 of the listener P1 on the driver's seat side and the distance y2 of the passenger ⁇ 2 on the passenger seat side are the same in the vehicle interior space X, ⁇ , and the first R of the speaker unit SP1
• the relationship between the path oc reaching the listener P1 on the driver's seat reflecting the reflective surface A from the channel speaker 101 and the distance reaching the listener P2 on the passenger side directly from the second R channel speaker 102 Is as follows.
• Path ⁇ Path
• 8 Path l ((xl + X 3) 2 + (yl) 2 ) ° ' 5 ...
• Path 2 ((x2— x3) 2 + (y 2) 2 ) ° 5 7)
• the following formula (4) is derived from condition 2 and the above formulas (2) and (3). If condition 1 is applied and ⁇ 3 is solved, equation (5) is obtained.
• the speaker unit SP1 may be arranged at a distance x3 away from the wall A by only 1Z2 between the two listeners PI and P2.
• the elevation angle is measured with respect to the first R channel speaker 101 (reflected to the listener P1) of the speaker units SP1 and SP2 (represented by the speaker unit SP1 and the listener P1 in FIG. 2). It is desirable to attach the speaker unit SP1 with an elevation angle rh so that the directional axis a of the speaker on the radiating side is at the level of the ear of the listener P1. By setting the elevation angle rh in this way, the acoustic listener P1 radiated from the speakers 101 and 102 can be heard easily.
• speaker system 100 radiates the first R channel speaker 101 that radiates the positive phase of the R channel signal and the reverse phase of the R channel signal.
• the first R channel speaker 101 and the second R channel speaker 102 are symmetrical with respect to the first reference plane c including the first listening point of the listener, and
• the acoustic force from the first R channel speaker 101 is arranged so as to be reflected by the side glass 210 as a reflecting surface and reach the first listening point.
• the same relationship applies to the third L-channel speaker 103 and the fourth L-channel speaker 104!
• the sound of one speaker among the speakers constituting the speaker units SP1 and SP2 is reflected on the side glasses 210 and 220 to reach the listener's listening point with force, and the sound of the other speaker is It is placed at the same distance as the distance to reach the listener's listening point directly.
• the listening point of the listener is arranged on an axis where the normal phase of the sound signal from the one speaker and the reverse phase of the sound signal from the other speaker cancel each other. This makes it possible to realize a speaker system that can provide a listening environment that does not give the listener a sense of incongruity.
• the first and second listening points are described as being preliminarily determined and around the head of the listener sitting in the driver's seat and the passenger seat. More preferably, when the vehicle is a so-called right-hand drive vehicle, the first listening point is set around the left ear of the listener seated in the driver's seat, and the second listening point is the listener seated in the passenger seat. Is set around the right ear. If the vehicle is a so-called left-hand drive vehicle, the first listening point is set around the right ear of the listener seated in the driver's seat, and the second listening point is the left ear of the listener seated in the passenger seat. It is set around.
• an example applied to a speaker system arranged on a dashboard of a vehicle may be described, and may be mounted in another position within a vehicle.
• the present invention can also be applied to a speaker system installed in a narrow room, for example.
• the force using the name "speaker system” is for convenience of explanation, and may be an audio system, a sound reproduction system, a vehicle-mounted speaker device, a vehicle-mounted audio device, or the like. Of course.
• each circuit unit constituting the speaker system for example, the signal processing unit, are not limited to the above-described embodiments.
• the speaker system according to the present invention is useful as an in-vehicle speaker system installed in a vehicle interior. It can also be applied to products such as products with multiple speaker units. Moreover, it is suitable for a speaker system installed in a narrow space other than the passenger compartment.

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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)

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Citations (7)

• 2006
  • 2006-05-31 JP JP2006152550A patent/JP2007324907A/ja active Pending
• 2007
  • 2007-05-28 WO PCT/JP2007/060826 patent/WO2007139066A1/ja active Application Filing
  • 2007-05-28 CN CNA2007800203625A patent/CN101461256A/zh not_active Withdrawn
  • 2007-05-28 EP EP07744260A patent/EP2023672A1/en not_active Withdrawn

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