JPH0946788A - In-vehicle sound reproduction device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To solve the problem that the sound field of a listener is dominated by the direct emission sound of the speaker close to the listener in the rear seat, and the sound field sense is biased. SOLUTION: A speaker 8L1 that emits sound in the left panel 9L direction and a speaker 8L that emits sound in the right panel 9R direction
The system 7L composed of 2 and 2 is placed on the upper left side of the rear panel 6 so that the distance between the speaker 8L1 and the listener position of the left rear seat 5L and the distance between the speaker 8L2 and the listener position of the left rear seat 5L are substantially the same. A speaker 8R1 that is placed and emits sound in the right panel 9R direction, and a speaker that emits sound in the left panel 9L direction
The system 7R consisting of 8R2 is the distance between the speaker 8R1 and the listener position of the right rear seat 5R, the speaker 8R2 and the left rear seat 5R.
The rear panel so that the distance from the listener's position is almost the same.
6 is arranged on the upper right side, and the speakers 8L2 and 8R2 reproduce the L-channel signal and the R-channel signal which are reproduced by the speakers 8L1 and 8R1, respectively, and signals having opposite phases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle sound reproducing device, and more specifically, on-vehicle sound reproducing device for reproducing each channel signal by an L channel speaker system and an R channel speaker system spatially arranged on a rear tray. It relates to the device.

[0002]

2. Description of the Related Art As a typical conventional vehicle-mounted sound reproducing method, there is a method of reproducing L and R channel signals on a front side and a rear side in a vehicle interior, respectively. FIG. 8 shows the configuration of a conventional device in such a reproducing method.

In the conventional vehicle-mounted sound reproducing device, front speakers 3 are provided on the left and right sides of the front deck 2 in the passenger compartment 1.
L and 3R are arranged, and speaker systems 70L and 70R are placed on the left and right of the rear tray 6. The left and right front speakers 3L and 3R are installed such that the listener positions of the left and right front seats 4 (for example, the right front speaker 3R is the listener M1 position of the right front seat) are the front, and the amplifiers from the program source 10 are used. L respectively supplied via 11FL and 11FR,
The R channel signal is reproduced. The left and right speaker systems 70L and 70R mounted on the rear tray 6 have rear speakers 80 with front and rear listener positions of the left and right rear seats 5L and 5R, respectively.
L, 80R (for example, for the left speaker system 70L, the left rear speaker 80L with the listener M2 position on the left rear seat 5L as the front) is installed, the rear speakers 80L, 80L
The R reproduces the amplified L and R channel signals. In the figure, 9L and 9R are the left panel inside the passenger compartment 1,
It is a right panel, and 11L and 11R are amplifiers. Further, as another conventional example, there is a vehicle-mounted sound reproducing device of the above-mentioned conventional example in which rear speakers are directly installed on the left and right sides of the rear tray. In this case, the rear speaker is arranged so as to face upward in the vehicle compartment.

[0004]

In the conventional vehicle-mounted sound reproducing device having such a configuration, the rear speaker is arranged close to the rear of the listener in the rear seat, that is, the listener's head. Since the rear speaker is arranged immediately behind and the direct sound of the rear speaker adjacent thereto is emitted toward the listener in the rear seat, the listener in the rear seat is informed of the proximity of the rear speaker. A sound field that depends a lot, that is, is dominated by the rear speaker, is formed, and an unbalanced sound field feeling occurs. The same applies to the rear speaker installed so as to face the upper part of the vehicle compartment. That is, in this case, the direct sound emitted toward the listener is reduced as compared with the conventional example in which the speaker system is arranged on the rear tray, but the wraparound sound from the rear speaker is still generated in the listener's head. The sound field will be dominated by this rear speaker after all.

Further, generally, in the sound reproduction in the vehicle compartment, the reproduction sound is tuned mainly in the front seat where the driver is located. However, in such a conventional sound reproduction device,
Since there is a close rear speaker that emits the direct sound, the volume feeling of the listener in the rear seat becomes much higher than that of the listener in the front seat, and the listener in the rear seat has a very high volume feeling. It was annoying and annoying.

In view of the above, the present invention eliminates the drawbacks of the above-mentioned conventional example, and sets the opposite sides of the passenger compartment side panel to the front.
The speaker system with two speakers is placed on the left and right on the rear tray so that the distance between the two speakers is almost the same for the listener in the rear seat, and one speaker is driven in the opposite phase, so that the It is an object of the present invention to provide a vehicle-mounted sound reproduction device that improves the stereo feeling and the volume feeling.

[0007]

In order to achieve the above object, a vehicle-mounted sound reproducing device according to the present invention comprises an L channel speaker system and an R channel speaker system spatially arranged on the left and right sides of a rear tray. ,
In an in-vehicle sound reproducing device in which each channel signal is reproduced, an L-channel speaker system includes a first speaker that emits sound in a left panel direction and a first speaker that is installed substantially coaxially with the first speaker and emits sound in a right panel direction. A second speaker and a distance between the first speaker and a listener position on the left back seat and a distance between the second speaker and a listener position on the left back seat are substantially the same. , An R-channel speaker system disposed on the rear panel includes a third speaker that emits sound toward the right panel,
The fourth speaker is installed substantially coaxially with the fourth speaker and emits sound toward the left panel, and the distance between the third speaker and the listener position on the right rear seat and the fourth speaker.
Is placed on the rear panel so that the distance between the speaker and the listener position on the left rear seat is approximately the same, and the second and fourth speakers are L reproduced by the first and third speakers. The L channel signal and the R channel signal having opposite phases to the channel signal and the R channel signal, respectively, are reproduced, and further, the sound pressure level of the channel signal reproduced by the second and fourth speakers is 1 and 3
The setting is made to be lower than the sound pressure level of the channel signal reproduced by the speaker.

The operation of the vehicle-mounted sound reproducing device having such a structure will be described.

In this on-vehicle sound reproducing device, the same effect is applied to the listeners on the left and right rear seats. Therefore, in order to simplify the explanation, only the effect on the listener on the left rear seat will be described in detail. explain.

For the listener in the left rear seat, the direct sound from each speaker of the L channel speaker system located immediately behind, that is, the direct sound from the rear direction of the listener from each speaker, is driven in a phase opposite to each other. Therefore, they cancel each other out, and such direct sounds are not supplied.

Then, the listener is supplied with the reflected sound of the L channel signal radiated from the first speaker of the L channel speaker system and reflected by the left panel in the vehicle compartment to his left ear, and to his right ear. The direct emission sound of the R channel signal from the fourth speaker of the channel speaker system and the rounding sound of the L channel signal from the second speaker of the L channel speaker system will be supplied. Considering the level of the reproduced sound supplied to the listener at this time, the difference between the reflected sound from the first speaker and the direct emission sound from the fourth speaker is the difference between the reflected sound and the direct emission sound. The sound pressure level to the listener is higher in the direct radiated sound of the R channel reproduction due to
Since the fourth speaker and the listener position on the left rear seat are relatively distant from each other, the sound pressure level difference does not change so much. Further, the right ear of the listener is supplied with the revolving sound of the L channel reproduction by the second speaker, but since it is the revolving sound, it is at a relatively low level and is directly output by the fourth speaker. The level is lower than that of the radiated sound, and the rounding sound of the L channel reproduction by the second speaker does not dominate the listener. Therefore, the sound field of the listener in the left rear seat received from the speaker system on the rear panel mainly depends on the reflected sound of the L channel reproduction by the first speaker and the direct emission sound of the R channel reproduction by the fourth speaker. Therefore, this vehicle-mounted sound reproducing device can give the listener a natural stereoscopic feeling.

Further, in the case where the sound pressure levels of the channel signals reproduced by the second and fourth speakers are set to be lower than the sound pressure levels of the channel signals reproduced by the first and third speakers. , At the listener position in the left rear seat, the reflected sound of the L channel reproduction by the first speaker and the direct emission sound of the R channel reproduction by the fourth speaker can have the same sound pressure level, and It is possible to further reduce the rounding sound of the L channel reproduction by the speaker of, and to give the listener a more natural stereo feeling.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a diagram for explaining an on-vehicle sound reproducing apparatus of the first embodiment, FIG. 2 is a diagram for explaining a speaker system used in the first and second embodiments, and FIG. 3 is a on-vehicle sound of the first and second embodiments. FIG. 5 is a diagram for explaining the arrangement of the speaker system in the reproducing device, FIG. 4 is a diagram for explaining the on-vehicle acoustic reproducing device of the second embodiment, and FIG.
Is a diagram for explaining the operation of the vehicle-mounted sound reproducing device of the first and second embodiments, FIG. 6 is a diagram for explaining a sound field of a listener in the vehicle-mounted sound reproducing device of the first embodiment, and FIG. 7 is a vehicle of the second embodiment. It is a figure explaining the sound field of the listener in the audio reproduction device for audio.

In the figure, the same components as those of the conventional vehicle-mounted sound reproducing device are designated by the same reference numerals, and the description thereof will be omitted.

Reference numerals 7L and 7R denote an L channel speaker system and an R channel speaker system, respectively. The L channel speaker system 7L has a first speaker 8L1 and a second speaker 8L2 coaxially with the opposite directions to the front. In the R channel speaker system 7R, a third speaker 8R1 and a fourth speaker 8R2 are installed coaxially with the opposite directions to the front, respectively. Here, the first, second, third, and fourth speakers 8L1, 8L2, 8R1, and 8R2 all have the same characteristics, and the L channel speaker system 7L and the R channel speaker system 7R are the same system. . FIG. 2 shows the directional characteristics when the two speakers of this speaker system are driven in opposite phases. As shown in the figure, this speaker system has a bidirectional characteristic and is known as a so-called dipole speaker system.

Next, the L channel speaker system 7L,
Explaining the arrangement of the R channel speaker system 7R, the L channel speaker system 7L is arranged so that the first speaker 8L1 faces the left panel 9L, that is, the second speaker 8L2 faces the right panel 9R. The distance between the first speaker 8L1 and the listener M2 position of the left rear seat 5L and the distance between the second speaker 8L2 and the listener M2 position of the left rear seat 5L are made substantially the same, that is,
When viewed from the top of the passenger compartment 1, the center line on the right side of the passenger compartment 1 in the listener M2 with the left rear seat 5L is the L channel speaker system.
It is placed on the rear panel 1 so that it is aligned with the center line of 7L. R channel speaker system 7R is the third
The speaker 8R1 of the third speaker 8R1 is arranged so as to face the right panel 9R, that is, the fourth speaker 8R2 is arranged so as to face the left panel 9L, and the distance between the third speaker 8R1 and the listener position of the right rear seat 5R, and The distance between the speaker 8R2 of 4 and the listener position of the right rear seat 5R is set to be substantially the same, that is, when viewed from the top of the passenger compartment 1, the center of the left rear right passenger compartment 5R for the listener of the right rear seat 5R. The lines are placed on the rear panel 1 so that the lines coincide with the left and right center lines of the R channel speaker system 7R.

Also, in the figure, 11L1, 11L2, 11R1, 11
R2 is the first, second, third, and fourth speakers 8L1 and 8L2, respectively.
, 8R1, 8R2 amplifiers, 12L, 12R are L-channel phase inverters and R-channel phase inverters interposed between the program source 10 and the second speaker amplifier 11L2 and the fourth speaker amplifier 11R2, respectively. , 13L is an L channel attenuator interposed between the L channel phase inverter 12L and the second speaker amplifier 11L2, and 13R is between the R channel phase inverter 12R and the fourth speaker amplifier 11R2. It is an attenuator for R channel which is inserted in the. Here, the attenuator 13L for the L channel and the attenuator 13R for the R channel are the same attenuator, and they are interlocked.

The first embodiment will be described.

In the on-vehicle sound reproducing apparatus of the first embodiment, the amplified L and R channel signals are supplied to the left and right front speakers 3L and 3R, respectively, and the amplified L channel signal is supplied to the first speaker 8L1. The second speaker 8L2 has the phase-inverted and amplified L channel signal, the third speaker 8R1 has the amplified R-channel signal, and the fourth speaker 8R2 has the phase-inverted and amplified R channel signal. Signals are provided respectively.

Next, a second embodiment will be described. The on-vehicle sound reproducing device of the second embodiment is different from that of the first embodiment.
L channel phase inverter 12L and second speaker amplifier
These L-channel attenuators 13L are different from the L-channel attenuators 13L, and the R-channel attenuators 13R are interposed between the R-channel phase inverter 12R and the fourth speaker amplifier 11R2. Operate the channel attenuator 13L and the R channel attenuator 13R in an interlocked manner, and
By attenuating the channel signal at the same level, the second speaker 8L2 receives a phase-reversed L channel signal, which has a smaller level than the signal supplied to the first speaker 8L1, to the fourth speaker 8R2. Is the third speaker
The phase-inverted R channel signals, which have a smaller level than the signal supplied to 8R1, are supplied respectively.

The operation of the vehicle-mounted audio reproduction apparatus of the first and second embodiments will be described with reference to FIG. 5. In the vehicle-mounted audio reproduction apparatus of the first and second embodiments, the listener M2 of the left rear seat 5L has the first ear on the left ear. The reflected sound of the L channel signal radiated from the first speaker 8L1 and reflected by the left panel 9L in the vehicle compartment is supplied, and the right ear emits the R channel signal directly emitted from the fourth speaker 8R2 and the second speaker. The L channel signal wraparound sound from 8L2 will be supplied. At this time, listener M2
Immediately in the rear direction, the sound emitted from the first speaker 8L1 and the second speaker
Since the sound emitted from the speaker 8L2 of 1 is opposite in phase to each other, it is canceled and there is no signal sound from this direction.

Next, the first embodiment having such an action,
Listener on the left rear seat 5L in the in-vehicle sound reproduction device of No. 2
The sound field formed in M2 will be described with reference to FIGS. 6 and 7, respectively.

In the first embodiment, the sound field is formed on the left side of the listener M2 by the L-channel signal sound 14L1 which is the reflected sound of the first speaker 8L1, and the sound field of the fourth speaker 8R2 is formed on the right side of the listener M2. A sound field is formed by the R channel signal sound 14R2, which is a direct emission sound, and the L channel signal sound 14L2, which is the sound spilled by the second speaker 8L2. At this time, regarding the sound pressure level of each signal sound, between the L channel signal sound 14L1 and the R channel signal sound 14R2, the sound pressure level of the R channel signal sound 14R2 becomes higher due to the difference between the reflected sound and the direct emission sound. However, since the fourth speaker 8R2 and the listener M2 position on the left rear seat 5L are relatively distant from each other, the sound pressure level difference is slightly larger for the R channel signal sound 14R2.
And the L channel signal sound 14L2 on the right side of the listener M2
Is a rounding sound, and therefore has a smaller level than the L-channel signal sound 14L1 and the R-channel signal sound 14R2, and is a level that does not dominate the sound field of the listener M2.
Therefore, the sound field of the listener M2 is mainly the L channel signal sound.
14L1 and the R-channel signal sound 14R2 are dominated by the sound field, and the listener M2 is provided with a sound field in which a natural stereo feeling is obtained.

In the second embodiment, the sound pressure level of the R channel signal reproduced by the fourth speaker 8R2 in the first embodiment is made smaller than the sound pressure level of the L channel signal reproduced by the first speaker 8L1. Since the L channel signal sound 14L1 and the R channel signal sound 14R2 have the same sound pressure level, and the L channel signal sound 14L2 has a smaller level, the listener M2 feels more natural. An excellent sound field is formed that provides a good stereo feeling.

Further, in the vehicle-mounted sound reproducing device of the first and second embodiments, since the first, second, third and fourth speakers are all arranged so as to face the panel side, the front seat listening The reflected sound to the person increases, and a sound field with a sense of spaciousness is formed in the vehicle interior.

Further, in the vehicle-mounted sound reproducing device of the first and second embodiments, a direct sound is output to the closest listener position from the front speaker, which is arranged relatively far from the listener in the front seat. Since the sound emitted from the speaker system located immediately behind the listener in the rear seat is not directly radiated to the nearest listener position, the sound between the listener position in the front seat and the listener position in the rear seat is not heard. The pressure difference is reduced and the playback sound can be tuned for all seats.

The on-vehicle sound reproducing device according to the present invention has been described above in detail based on the considered typical examples. However, the embodiment of the on-vehicle sound reproducing device according to the present invention is limited to the structure of the above-mentioned embodiment. However, the present invention can be appropriately modified and implemented as long as it has the constituent features described in the above-mentioned claims, exhibits the action of the present invention, and has the effects described below.

[0029]

The on-vehicle sound reproducing device according to the present invention has the following effects. (1) On the left (right) side of the listener located in the left (right) rear seat, a sound field is formed by the L (R) channel signal sound which is the reflected sound of the first (third) speaker, On the right (left) side of the person, the R (L) channel signal sound, which is the direct emission sound of the fourth (second) speaker, and the L (R) channel, which is the revolving sound of the second (fourth) speaker. A sound field is formed by the signal sound and the L (R) channel which is the reflected sound of the first (third) speaker and the R (L) channel which is the direct emission sound of the fourth (second) speaker. Since the sound field of the listener is governed by the signal sound, a sound field in which a natural stereo feeling is obtained is formed. (2) Since the first, second, third, and fourth speakers are all arranged so as to face the panel side on the side of the passenger compartment, the reflected sound to the listener in the front seat increases, and the passenger compartment A wide sound field is formed. (3) Further, in the case where the sound pressure levels of the channel signals reproduced by the second and fourth speakers are set to be lower than the sound pressure levels of the channel signals reproduced by the first and third speakers. , L (R) channel signal sound, which is the reflected sound of the first (third) speaker, and R, which is the direct emission sound of the fourth (second) speaker, for a listener located in the left (right) rear seat. It is possible to set the same sound pressure level as that of the (L) channel signal sound, and to set the L (R) channel signal sound, which is the rounding sound of the second (fourth) speaker, to a very low level. An excellent sound field can be formed with which a more natural stereo feeling can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an on-vehicle sound reproducing device according to a first embodiment.

FIG. 2 is a diagram illustrating a speaker system used in Examples 1 and 2.

FIG. 3 is a diagram for explaining the arrangement of speaker systems in the vehicle-mounted sound reproduction devices of Examples 1 and 2.

FIG. 4 is a diagram illustrating an on-vehicle sound reproducing device according to a second embodiment.

FIG. 5 is a diagram for explaining the operation of the vehicle-mounted sound reproduction device according to the first and second embodiments.

FIG. 6 is a diagram illustrating a listener's sound field in the vehicle-mounted sound reproduction device according to the first embodiment.

FIG. 7 is a diagram illustrating a sound field of a listener in the vehicle-mounted sound reproduction device according to the second embodiment.

FIG. 8 is a diagram illustrating a conventional vehicle-mounted sound reproducing device.

[Explanation of symbols]

1 Cabin 2 Front deck 3L, 3R Front speaker 4 Front seat 5L, 5R Rear seat 6 Rear tray 7L, 7R Speaker system 8L1, 8L2, 8R1, 8R2 1st, 2nd, 3rd and 4th speaker 9L, 9R Panel 10 Program source 11FL, 11FR, 11L1,11L2,11R1,11R2 Amplifier 12L, 12R Phase inverter 13L, 13R Attenuator 14L1,14L2 L channel signal sound 14R2 R channel signal sound M1, M2 Listener

Claims (2)

[Claims] 1. An in-vehicle sound reproducing device in which each channel signal is reproduced by an L channel speaker system and an R channel speaker system spatially arranged on the left and right on a rear tray, wherein the L channel speaker system is left. A first speaker that emits sound in the panel direction and a second speaker that is installed substantially coaxially with this and emits sound in the right panel direction are provided. The R channel speaker system is arranged on the rear panel so that the distance from the listener position and the distance between the second speaker and the listener position on the left rear seat are substantially the same, and the R channel speaker system emits sound toward the right panel. It is composed of a third speaker and a fourth speaker which is installed substantially coaxially with the third speaker and emits sound toward the left panel. The third speaker is arranged on the rear panel so that the distance between the third speaker and the listener position on the right rear seat is substantially the same as the distance between the fourth speaker and the listener position on the left rear seat. And the fourth speaker reproduces the L channel signal and the R channel signal which are respectively opposite in phase to the L channel signal and the R channel signal reproduced by the first and third speakers, respectively. . 2. The sound pressure levels of the channel signals reproduced by the second and fourth speakers are set to be lower than the sound pressure levels of the channel signals reproduced by the first and third speakers. The on-vehicle sound reproducing device according to claim 1.