JP2005323025A - Bass reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bass reproducing device that enables a speaker unit to be installed even in a small-sized vehicle wherein large installation area can not be secured, and is capable of bass reproduction of high quality with sufficient sound pressure. <P>SOLUTION: The bass reproducing device is equipped with: at least four or more speaker devices 9a to 9f which each have a bass speaker unit 21 put in a dedicated cabinet 23 and are arranged dispersedly in a listening room 3a; and delay processing circuits 32a to 32f which adjust output timing of signals to the respective speaker devices 9a to 9f so that arrival times of sounds from the respective speaker devices 9a to 9f to a listening point (driver seat 4) in the listening room are coincident. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bass reproduction device, and more particularly to a bass reproduction device capable of reproducing a high-quality bass sound even in a passenger car compartment or the like where it is difficult to secure an installation space.

  Various types of audio devices for automobiles in which speaker units are built in vehicle body panels and front and rear doors constituting a passenger compartment have been proposed (see, for example, Patent Documents 1 to 3). .

By the way, as a method of increasing the sound pressure level in the low sound range in such an acoustic device, there are a method of increasing the area of the speaker diaphragm and a method of increasing the amplitude width of the diaphragm.
However, the method of increasing the amplitude width of the diaphragm causes an increase in the depth dimension of the speaker unit, and is difficult to adopt in the case of an automobile in which a vehicle body panel or a door having a limited depth dimension is an installation location.

  Therefore, in the case of an audio device for automobiles, the improvement of the sound pressure level in the low sound range is usually left to the method of increasing the area of the speaker diaphragm, and can be accommodated in a limited installation space such as a door, for example. A speaker unit having a maximum aperture (for example, about 16 cm) is attached.

  In that case, in order to make the best use of the installation space, the dedicated cabinet that houses the speaker unit is omitted, and the door to which the speaker unit is attached and the vehicle body panel itself are used as a cabinet that receives the back pressure of the speaker unit. It was common.

JP 2003-348678 A Japanese Patent Laid-Open No. 11-151989 Japanese Patent Laid-Open No. 10-108290

  However, car body panels and doors are not originally designed as cabinets that house speaker units, and are not airtight or rigid enough to cause back pressure leakage or resonance. There is a problem that distortion is likely to occur in the reproduced sound in the low frequency range, and even if a large-diameter speaker unit is installed, it is difficult to reproduce high-quality bass sound.

  In addition, since a large-diameter speaker unit is employed, it is necessary to secure a large installation area, and in a small vehicle or the like, a large installation area cannot be ensured, so that there is a problem that it cannot be mounted.

  The problems to be solved by the present invention include the problems that occur in the above-described prior art, because the sound reproduction and the rigidity are insufficient, so that the reproduction sound in the low range is distorted and high-quality low-frequency reproduction is difficult. The problem that the speaker unit cannot be installed in a small vehicle or the like that cannot secure a large installation area is an example.

  The bass reproduction device according to claim 1, wherein at least four or more speaker devices in which a speaker unit for bass is housed in a dedicated cabinet and distributed in a listening room, and each speaker device to the inside of the listening room. A delay processing circuit that adjusts the output timing of the signal to each speaker device according to the separation distance to the listening point of each speaker device so that the arrival time of the sound to the listening point set to It is characterized by that.

Hereinafter, preferred embodiments of a bass reproduction apparatus according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a layout view of a bass reproduction device according to an embodiment of the present invention mounted on a passenger car, and FIG. 2 is a block diagram of the bass reproduction device according to an embodiment of the present invention.

  The bass reproduction device 1 according to this embodiment is responsible for reproduction of a low frequency range in an acoustic system mounted on a vehicle 3 such as a passenger car. In the passenger compartment 3a serving as a listening room, the front side of the front of the driver's seat 4 is provided. A control amplifier (head amplifier) 5 disposed on a panel (dashboard) or the like, and six speaker devices 9a to 9f connected to the control amplifier 5 via power amplifiers 7a to 7f.

Of the six speaker devices 9a to 9f, the three speaker devices 9a to 9c reproduce Rch (right channel) during stereo reproduction, and the remaining three speaker devices 9d to 9f perform Lch (right channel) during stereo reproduction. Left channel).
The above six speaker devices 9a to 9f are dispersedly arranged in the passenger compartment 3a serving as a listening room.

  Specifically, as shown in FIG. 1, among the three speaker devices 9a to 9c for reproducing Rch in the passenger compartment 3a, the first Rch speaker device 9a is placed in the front door 11 on the right side of the vehicle. The second Rch speaker device 9b is arranged under the seat of the driver seat 4 on the right side of the vehicle, and the third Rch speaker device 9c is arranged in the rear door 13 on the right side of the vehicle.

  Of the three speaker devices 9d to 9f for reproducing Lch, the first Lch speaker device 9d is disposed in the front door 15 on the left side of the vehicle, and the second Lch speaker device 9e is an assistant on the left side of the vehicle. The third Lch speaker device 9f is disposed under the seat 16 and is disposed in the rear door 17 on the left side of the vehicle.

Each of the above speaker devices 9a to 9f is configured such that a speaker unit 21 having a small diameter for low sound (for example, a diameter of 70 mm) is accommodated in a dedicated cabinet 23.
The cabinet 23 has a minimum cubic shape or rectangular parallelepiped shape that accommodates the speaker unit 21. For example, when accommodating the speaker unit 21 having a diameter of 70 mm, the internal dimensions are 75 mm in width, 75 mm in height, and in depth. It is set to a rectangular parallelepiped of about 90 mm.

  The cabinet 23 is formed of, for example, a high-density hard synthetic resin, a metal die-cast, or a composite material of wood and resin, etc., and is formed into a robust box having sufficient sealing properties and sufficient rigidity. Has been. Although not shown, each cabinet 23 is filled with a sound absorbing material as necessary.

  For example, the control amplifier 5 is connected to a sound source such as an FM tuner, a cassette player, a CD player, or an MD player, and receives a low-frequency signal output from the selected sound source to each of the speaker devices 9a to 9f. The input stage circuit 31 for generating the output signal and six delay processing circuits 32a to 32f for applying a predetermined delay process to the signal output from the input stage circuit 31.

  The delay processing circuits 32a to 32f are provided for the respective speaker devices 9a to 9f. These delay processing circuits 32a to 32f are arranged so that the arrival times of sounds from the respective speaker devices 9a to 9f to a listening point (for example, the position of the driver's seat) in the passenger compartment 3a that are set in advance coincide with each other. The output timing of signals to the speaker devices 9a to 9f is adjusted by delay processing according to the separation distance to the listening point of the devices 9a to 9f.

  Although not shown, the control amplifier 5 can designate a listening point at an arbitrary position in the passenger compartment, and listening point adjusting means for adjusting the operations of the delay processing circuits 32a to 32f in accordance with the designated listening point. (Switch) is equipped.

As described above, the bass reproduction device 1 according to the embodiment of the present invention includes at least four speaker devices in which the bass speaker unit 21 is accommodated in the dedicated cabinet 23 and distributed in the listening room 3a. The listening points (driver seats) of the speaker devices 9a to 9f are matched so that the arrival times of the sounds from the speaker devices 9a to 9f to the listening point (driver seat 4) set in the listening room coincide. And delay processing circuits 32a to 32f that adjust the output timing of signals to the speaker devices 9a to 9f according to the separation distances up to 4).
Accordingly, in the bass reproduction apparatus 1, three speaker units 21 are provided for each channel to perform stereo reproduction in the low frequency range. For example, one low frequency range speaker unit is provided for each channel. Compared with a conventional general sound reproduction system that reproduces a low sound range in stereo, the number of speaker units 21 used is large, and therefore the speaker that determines the output sound pressure level even if the diameter of the single speaker unit 21 is reduced. Large diaphragm area can be secured.

  That is, the speaker unit 21 can be reduced in diameter according to the number of speaker units 21 assigned to the left and right channels, and a small vehicle or the like in which a large installation area cannot be secured by arranging them in a distributed manner. However, the speaker unit 21 can be installed, and a sufficient sound pressure level can be secured in low-frequency reproduction.

  In each of the speaker devices arranged in a distributed manner, the arrival time of the sound at the listening point is adjusted by the delay processing circuit, so the difference in the separation distance between each speaker device and the listening point causes a phase difference in the reproduced sound. Therefore, a clear sound localization and a high-quality three-dimensional sound field can be obtained, and the listener is not conscious of the distributed arrangement of the speaker units 21.

  Further, since each speaker unit 21 is installed as a speaker device housed in a dedicated cabinet, it ensures the necessary and sufficient airtightness and rigidity in the cabinet to prevent back pressure leakage and distortion due to resonance. Thus, low-frequency reproduction with sufficient sound pressure and high quality can be realized.

  Further, in the bass reproduction apparatus 1 of the above embodiment, the cabinet is a minimum required cube or rectangular parallelepiped that accommodates the speaker unit 21, and an increase in occupied space due to the installation of the dedicated cabinet is minimized. It can be put together into a small system that can be easily mounted on a small vehicle or the like.

  Furthermore, in the bass reproduction apparatus 1 of the above embodiment, since the speaker device can be small, there is no pressure on the installation space of various door parts such as a lock mechanism and a power window mechanism in which the speaker device is incorporated in the door. In addition, it is possible to facilitate the layout design of the door parts in the vehicle.

Note that the outer shape of the speaker cabinet is not limited to a cube or a rectangular parallelepiped. The speaker unit 21 can be accommodated and has a simple shape. For example, it may be a semispherical body.
In addition, if the number of speaker devices is at least two for each of the R channel and the L channel, the effect becomes clear. Therefore, the number of speaker devices is not limited to the above embodiment, and can be set to any even number of 4 or more in total.

  Further, the adjustment switch for adjusting the signal output timing to each speaker device by the delay processing circuits 32a to 32f may be provided in the control amplifier 5, or an adjustment switch may be provided for each seat in the vehicle interior. Also good.

  Further, the bass reproduction device of the present embodiment is not limited to an automobile. The bass reproduction device of the present invention is also effective in various vehicles in which a large installation space cannot be secured, or in a house where speaker devices are desired to be distributed at a plurality of locations on the wall surface.

  In addition to the delay processing circuits 32a to 32f, the control amplifier 5 has a level adjusting circuit for adjusting the output level of the signal and a frequency characteristic in order to realize a higher quality three-dimensional sound field. You may equip the equalizer circuit etc. to adjust.

It is a layout of the state mounted in the passenger car of one embodiment of the bass reproduction apparatus according to the present invention. It is a block diagram of one embodiment of a bass reproduction apparatus according to the present invention.

Explanation of symbols

1 Low-pitched sound reproduction device 3 Vehicle 3a Car room (listening room)
4 Driver's seat (listening point)
5 Control amplifier (head amplifier)
7a to 7f Power amplifier 9a to 9f Speaker device 11 Right front door 13 Right rear door 15 Left front door 16 Passenger seat 17 Left rear door 21 Speaker unit 23 Cabinet 31 Input stage circuit 32a to 32f Delay processing circuit

Claims (3)

At least four or more speaker devices in which the speaker unit for bass is housed in a dedicated cabinet and distributed in the listening room;
The output timing of the signal to each speaker device is set according to the separation distance to the listening point of each speaker device so that the arrival time of the sound from each speaker device to the listening point set in the listening room matches. A delay processing circuit to be adjusted;
A bass reproduction apparatus characterized by comprising:   The bass reproduction apparatus according to claim 1, wherein the cabinet has a minimum cubic shape or a rectangular parallelepiped shape that accommodates the speaker unit.   3. The bass reproduction device according to claim 1, wherein the listening room is a passenger compartment of the passenger car, and the speaker device is assembled to at least a front door and a rear door of the passenger car.

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