JP2005109543A - Sound volume balance adjustment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily set an environment having excellent sound volume balance to both a driver on a driver's seat and a passenger on a front seat. <P>SOLUTION: The sound volume balance adjustment apparatus can set a sound volume balance to a driver 2 similarly to the case of prior arts that the output of an assistant's seat side speaker 5 appears for the driver to have been increased by increasing only the output of the assistant's seat side speaker 5 outputted from a central speaker 10 closer in distance to the driver 2 without increasing a sound volume L of the assistant's seat side speaker 5 and prevent the sound volume balance to the passenger 4 at a position closer to the assistant's seat side speaker 5 from becoming greatly unbalanced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a volume balance adjusting device, and is suitable for application to, for example, an in-vehicle audio speaker system.

  Conventionally, in an in-vehicle audio speaker system, a 4Ch system including a driver seat side speaker, a passenger seat side speaker, a right rear seat side speaker, and a left rear seat side speaker is generally used.

Recently, not only such a 4Ch in-vehicle audio speaker system, but also a 5Ch center speaker provided on, for example, a dashboard between the driver side speaker and the passenger side speaker, and the right rear seat side A so-called 5.1Ch in-vehicle audio speaker system in which a subwoofer provided between a speaker and a left rear seat side speaker is added is also becoming common (see, for example, Patent Document 1).
JP2003-61198A

  By the way, in the in-vehicle audio speaker system having such a configuration, the driver is closer to the driver's seat side speaker and farther from the passenger's seat side speaker. Generally, setting the volume balance centered on the driver in the interior space of the vehicle by setting the volume of the vehicle to be large.

  In this case, since the passenger side speaker is close in distance to the passenger seat passenger, the sound volume from the passenger side speaker can be heard very loud, resulting in an unfavorable volume balance for the passenger in the interior space. There was a problem.

  The present invention has been made in consideration of the above points, and intends to propose a volume balance adjustment device that can easily set an acoustic environment with excellent volume balance for a user located anywhere in a predetermined space. Is.

  In order to solve such a problem, in the present invention, a first speaker provided on the side where the user is located in the predetermined space, a second speaker provided at a position away from the user in the predetermined space, A center speaker that is provided approximately in the middle of the first speaker and the second speaker in the predetermined space and that combines and outputs the first speaker output and the second speaker output, and the first speaker in the center speaker Control means for adjusting the volume balance for the user in the predetermined space by controlling the speaker output or the second speaker output is provided.

  This increases the volume of the second speaker for the user by increasing, for example, only the second speaker output at the center speaker that is close to the user without increasing the volume of the second speaker. The volume balance can be set to be almost the same as that at the time, and the volume balance for the user in the vicinity of the second speaker can be prevented from being greatly broken.

  As described above, according to the present invention, by increasing only the second speaker output, for example, in the center speaker that is close to the user without increasing the volume of the second speaker, it is as if the second speaker has the second speaker. The volume balance can be set almost the same as when the volume of the speaker is increased, and the volume balance with respect to the user in the vicinity of the second speaker can be prevented from being greatly collapsed, and thus predetermined. It is possible to realize a volume balance adjusting device that can easily set an acoustic environment having an excellent volume balance for a user located anywhere in the space.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Overall Configuration of 5.1 Ch In-Vehicle Audio Speaker System In FIG. 1, reference numeral 1 denotes a 5.1 Ch in-vehicle audio speaker system as a whole. The front passenger side speaker 5 which is the main for the passenger seat passenger 4, the right rear seat side speaker 7 which is the main for the right rear seat passenger 6, and the left which is the main for the left rear seat passenger 8. Rear seat side speakers 9 are arranged at the four corners of the interior space 12.

  In addition, in the 5.1Ch in-vehicle audio speaker system 1, in addition to the four driver side speakers 3, the front passenger side speaker 5, the right rear seat side speaker 7, and the left rear seat side speaker 9, the driver side Between the speaker 3 and the passenger seat side speaker 5, the center speaker 10 of the fifth channel, which is mainly for the driver 2 and the passenger 4, and between the right rear seat side speaker 7 and the left rear seat side speaker 9 are mainly used. A 5.1-ch subwoofer 11 used for the low sound range is arranged. Since the subwoofer 11 has only a low-frequency signal, there is no directivity, and the subwoofer 11 can be basically placed anywhere.

  As shown in FIG. 2, the 5.1Ch in-vehicle audio speaker system 1 has a 5Ch audio output amplifier 21 formed of an IC (Integrated Circuit), and the amplifiers 24-28 of the 5Ch audio output amplifier 21 are connected to a CPU (Central By controlling by the control unit 22 of the (Processing Unit) configuration, the driver side speaker 3, the passenger side speaker 5, the right rear seat side speaker 7, the left rear seat side speaker 9, the center speaker 10 and the bass subwoofer 11 are controlled. The output can be adjusted.

  The amplifier 26 is connected to the subwoofer 11 and the center speaker 10 through a low-pass filter 29 and a high-pass filter 30, and outputs a low-frequency component of the amplifier 26 through the subwoofer 11 as shown in FIG. The high-frequency component of the amplifier 26 is output via the center speaker 10.

  As a result, the 5Ch audio output amplifier 21 does not need to be provided with a separate amplifier for the subwoofer 11 even when the 5.1Ch system is adopted, but only through the low-pass filter 29 and the high-pass filter 30 while having the 5Ch configuration. It can be adapted to the 5.1 Ch system with a simple configuration. Incidentally, the amplifier for the subwoofer 11 may be configured individually.

  Here, the center speaker 10 is configured to synthesize the output of the driver's seat side speaker 3 and the output of the passenger's seat side speaker 5, and the control unit 22 controls the driver's seat side of the center speaker 10 according to the operation of the volume 23. The volume of the speaker 3 or the volume of the passenger side speaker 5 can be freely adjusted.

  Note that the control unit 22 responds to an operation on a volume other than the volume 23 provided on the operation panel (not shown), according to an operation on the driver side speaker 3, the passenger seat side speaker 5, the right rear seat side speaker 7, The volume of the left rear seat side speaker 9 and the subwoofer 11 can also be adjusted.

(2) Volume Balance Adjustment Method Using Center Speaker Before explaining the volume balance adjustment method using the center speaker 10 of the present invention, first, a conventional “volume adjustment method without using the center speaker” will be described with reference to FIG. I will explain.

  The output (volume) of the driver side speaker 3 closer to the driver 2 is R, the output (volume) of the passenger side speaker 5 farther from the driver 2 is L, and the volume R In order to set the sound volume L as if it is the same sound volume level as that of the driver 2, the attenuation rate α with respect to the sound volume L of the passenger side speaker 5 is used to

In order to satisfy the relationship, the volume L of the passenger side speaker 5 needs to be increased by an increase ΔL, and the increase ΔL is expressed by the following equation:

It is represented by

  On the other hand, in the “volume balance adjustment method using the center speaker” in FIG. 5 in which the same reference numerals are given to the corresponding parts to FIG. 4, the volume of the driver side speaker 3 closer to the driver 2 is closer. Rather than directly adjusting the volume L of the front passenger side speaker 5 with respect to R and the driver 2, the output R 'of the driver side speaker 3 and the output L' of the front passenger side speaker 5 are combined. Thus, the output (L ′ + R ′) of the center speaker 10 to be output is adjusted.

  Here, the output (L ′ + R ′) of the center speaker 10 is a combined amount of the output R ′ of the driver side speaker 3 and the output L ′ of the passenger side speaker 5 to be output by the center speaker 10, In response to the user's operation on the volume 23, the control unit 22 increases the output of the driver side speaker 3, that is, the volume R ′ of the volume (L ′ + R ′) of the center speaker 10, for example, an increase ΔR ′, or the passenger side speaker. With respect to the output of 5, that is, the volume L ′, the increase ΔL ′ can be increased.

  The control unit 22 can hear the volume R of the driver's side speaker 3 and the volume L of the passenger's side speaker 5 with the center speaker 10 added as if the volume is the same for the driver 2. Is expressed by the following equation using the attenuation rate β with respect to the volume (L ′ + R ′) of the center speaker 10.

In order to satisfy this relationship, it is necessary to increase the volume L ′ of the passenger side speaker 5 output via the center speaker 10 by an increment ΔL ′, and the increment ΔL ′ is expressed by the following equation:

It is represented by

  Here, when the volume L ′ of the passenger seat side speaker 5 output through the center speaker 10 is increased by the increment ΔL ′, the following equation is essentially used.

In this case, (L ′ + R ′) is a composite amount of the volume R ′ of the driver side speaker 3 and the volume L ′ of the passenger side speaker 5 and corresponds to a monaural output, and can be ignored. .

  When the above equations (2) and (4) are compared, the attenuation rate α and the attenuation rate β are in the relationship of attenuation rate β> attenuation rate α due to the difference in the distance to the driver 2.

The relationship is established.

  At this time, the controller 22 increases the increase ΔL ′ of the passenger seat side speaker 5 output through the center speaker 10 smaller than the increase ΔL ′ of the volume L output from the conventional passenger seat speaker 5. Without increasing the volume αL of the passenger side speaker 5, the volume R of the driver side speaker 3 can be increased by increasing the volume L ′ of the passenger side speaker 5 output via the center speaker 10 by an increase ΔL ′. An appropriate volume balance in the vehicle interior space 12 can be set by the volume αL of the passenger seat side speaker 5 and the increase ΔL ′ of the passenger seat side speaker 5 in the center speaker 10.

(3) Operation and Effect In the above configuration, the control unit 22 of the 5.1Ch in-vehicle audio speaker system 1 particularly adjusts the volume R of the driver's side speaker 3 and the volume L of the passenger's side speaker 5. The optimal volume balance for the driver 2 can be set by simply increasing the output L ′ of the passenger seat side speaker 5 in the center speaker 10 by an increase ΔL ′.

  At this time, for passenger 4 on the passenger seat side, the output L ′ of the passenger seat side speaker 5 in the center speaker 10 is increased by an increase ΔL ′ without changing the volume L of the passenger seat side speaker 5. The increase ΔL ′ is also smaller than when the volume L of the passenger seat side speaker 5 is increased by the increase ΔL in the conventional “volume adjustment method without using the center speaker”, so that the volume balance collapse for the passenger 4 is very small. be able to.

  According to the above configuration, the control unit 22 of the 5.1 Ch in-vehicle audio speaker system 1 only increases the output L ′ of the passenger seat side speaker 5 in the center speaker 10 by an increase ΔL ′ and Thus, it is possible to set an optimal volume balance for the driver 2 while reducing the influence of the driver.

(4) Other Embodiments In the above-described embodiment, the passenger seat side speaker 5 in the center speaker 10 is not adjusted without adjusting the volume R of the driver seat side speaker 3 and the volume L of the passenger seat side speaker 5. However, the present invention is not limited to this, and the output R ′ of the driver's seat side speaker 3 in the center speaker 10 is not limited to this. May be increased by an increment ΔR ′.

  In the above-described embodiment, the volume ΔR of the driver's seat side speaker 3 and the volume L of the passenger's seat side speaker 5 are not adjusted, and the output L ′ of the passenger seat side speaker 5 in the center speaker 10 is increased by ΔL. However, the present invention is not limited to this, and instead of increasing the output L ′ of the passenger seat side speaker 5 in the center speaker 10 by the increment ΔL ′, the driver seat side in the center speaker 10 is increased. The output R ′ of the speaker 3 may be reduced by a decrease ΔR ′.

  Furthermore, in the above-described embodiment, the volume R of the driver's seat side speaker 3 and the volume L of the passenger's seat side speaker 5 are not adjusted, and the output Δ ′ of the passenger seat side speaker 5 in the center speaker 10 is increased by ΔL. However, the present invention is not limited to this, and the output L ′ of the passenger side speaker 5 in the center speaker 10 is increased by ΔL ′ and the volume of the driver side speaker 3 is decreased. You may do it.

  Furthermore, in the above-described embodiment, the case where the output L ′ of the passenger seat side speaker 5 in the center speaker 10 is increased by the increment ΔL ′ has been described, but the present invention is not limited to this, and the center speaker 10 In addition, the volume of the driver's side speaker 3 or the passenger's side speaker 5 may be finely adjusted.

  Furthermore, in the above-described embodiment, the case where the 5.1Ch in-vehicle audio speaker system 1 is applied in the vehicle interior space 12 is described. However, the present invention is not limited to this, and the seating position of the user is fixed. You may make it apply in the indoor space etc. which are done.

  Furthermore, in the above-described embodiment, the case where the center speaker 10 is arranged at a substantially intermediate position between the driver side speaker 3 and the passenger side speaker 5 has been described, but the present invention is not limited to this, and the driver seat It may be arranged at a substantially middle position between the passenger seat and the passenger seat, or at a substantially middle position between the right rear seat and the left rear seat.

  Furthermore, in the above-described embodiment, the driver's seat side speaker 3 as the first speaker, the passenger seat side speaker 5 as the second speaker, the center speaker 10 and the control unit 22 as the control means serve as a volume balance adjusting device. However, the present invention is not limited to this, and the first speaker, the second speaker, and the center speaker having other various configurations are described. The volume balance adjusting device may be configured by the control means.

  The volume balance adjusting device of the present invention is used to adjust the volume balance of the interior space 12 in an audio system in which the center speaker 10 is disposed at a substantially intermediate position between the driver side speaker 3 and the passenger seat side speaker 5 in the interior space 12, for example. Can be applied to.

It is a basic diagram which shows the whole structure of the 5.1Ch system vehicle-mounted audio speaker system of this invention. It is a basic diagram which shows the circuit structure of a 5Ch audio output control apparatus. It is a basic diagram which shows the output frequency of a center speaker and a subwoofer. It is a basic diagram with which it uses for description of the conventional volume adjustment method without a center speaker. It is a basic diagram with which it uses for description of the volume balance adjustment method using the center speaker of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Car audio speaker system, 2 ... Driver, 3 ... Driver side speaker, 5 ... Passenger side speaker, 10 ... Center speaker, 22 ... Control part, 23 ... Volume, 29 ... Low-pass filter, 30 ... High-pass filter.

Claims (5)

A first speaker provided on a side where the user is located in a predetermined space;
A second speaker provided at a position away from the user in the predetermined space;
A center speaker that is provided approximately in the middle of the first speaker and the second speaker in the predetermined space, and that combines and outputs the first speaker output and the second speaker output;
A volume balance adjusting device comprising: control means for adjusting the volume balance for the user in the predetermined space by controlling the first speaker output or the second speaker output in the center speaker. . The volume control apparatus according to claim 1, wherein the control means increases only the second speaker output of the center speaker. The volume control apparatus according to claim 1, wherein the control unit reduces only the first speaker output of the center speaker. The volume control device according to claim 1, wherein the control unit increases the second speaker output of the center speaker and decreases the first speaker output. The volume control device according to claim 1, wherein the control unit controls the volume of the first speaker or the volume of the second speaker in addition to the center speaker.

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