JPS62268752A - Acoustic device for car - Google Patents

Abstract

PURPOSE:To obtain excellent acoustic feeling by providing speakers regenerating individual channel signals in all frequency bands in front of the front seat occupants and also providing speakers regenerating signals in predetermined frequency bands or less at the rear of the front seat occupants and in front of the rear seat occupants. CONSTITUTION:Front speakers 15, 16 are connected to R and L channels of the preamplifier 12 of an acoustic source 11 via main amplifiers 13, 14 respectively. The front speakers 15, 16 are arranged in front of the occupants M1, M2 seated on front seats 2, 3 in a car room 1 and at both sides of an instrument panel 5. On the other hand, low pass filters 17, 18 which are cut-off means are provided on individual channel circuits formed in branch at the output side of the preamplifier 12. Rear speakers 21, 22 are connected to low pass filters 17, 18 via main amplifiers 19, 20, and the rear speakers 21, 22 are arranged near the front end sections of rear doors 23, 24.

Description

[Detailed Description of the Invention] Field of Application of Ganto The present invention provides a clear sound array that is localized in front of the vehicle while allowing both front and rear seat passengers seated in the car guide to experience the feeling of being surrounded by sound. A vehicle acoustic system that makes it possible to obtain
Regarding this.

2. Prior Art As a conventional single-vehicle acoustic device, the one with the structure shown in Figure 6.7 is in practical use. V-
(See page 43). That is, inside the single room 1, front seats 2 and 3 and a rear seat 4 are fixedly placed.

A 70-ton speaker 6.7 is installed in both 11Q of the instrument panel 5 installed horizontally in front of the front seat 2.3, and a capacitor shelf installed horizontally behind the rear seat 4. Rear speakers 9 and IO are arranged on both sides of the speaker 8. In such a configuration, the front speakers 6.7 and the rear speakers 9, 10 reproduce the entire frequency band of each left channel signal output from an audio source (not shown), thereby reproducing the front seats 2, 3 and the rear seats 4. Crew member M is seated.

The Mt1M11M4 can provide a feeling of being enveloped in sound by the sound reproduced by the speakers 6°7.9.10 placed in the front and rear.

However, in the case of such a conventional device, as mentioned above, the listening sensation of being enveloped in sound by the sound reproduced from each speaker 6.7° 9.10 radiated from the front and back is difficult to solve. On the other hand, the front seat occupants M, , M, and l have the problem that the sound image that should be formed in front of them by the front speakers 6.7 is affected by the sound reproduced by the rear speakers 9 and 10 emitted from the rear. Therefore, a disadvantage arises in that a clear front localization of the sound image cannot be obtained. - Rear seat occupant MS *In the M4, the sound image is localized to the rear without being localized to the front due to the sound reproduced by the rear speaker 9°10, and the distance to the sound source (rear speaker 9°10) is extremely close. from,
The reproduced sound comes directly to the ears, and it is not possible to obtain the sense of spaciousness that is created by setting an appropriate distance to the sound source.

Means for Solving the Problems The present invention has been made in view of the problems of the prior art, and includes front speakers for reproducing left and right channel signals in front of front seat passengers seated in the vehicle interior. A rear speaker is arranged between a front seat occupant and a rear seat occupant, and the rear speaker is connected to the rear speaker. A cutoff means is provided for inputting an acoustic signal having a predetermined frequency or less among the acoustic signals output from the acoustic source.

Effect In the above configuration, the front seat occupant can obtain a front-localized sound image by the sound reproduced by the front speakers arranged opposite to each other in front, and can also be surrounded by the sound by the sound reproduced by the front speakers arranged behind the front seat passenger. You can get the best listening experience.

At this time, since an acoustic signal having a frequency lower than the predetermined frequency is input to the rear speaker, only the low frequency range, which has weak directivity, is reproduced without reproducing the high frequency range, which has audible directivity. Therefore, the front seat occupant can obtain a listening sensation of being surrounded by sound due to the sound reproduced from the rear speakers, while ensuring a frontally localized sound image due to the sound reproduced from the front speakers.

On the other hand, for rear seat passengers, since both the front and rear speakers are placed in front of them, the sound image is naturally localized in front of them, and the sound image is closer to the front speakers, which reproduce the entire frequency range including the mid-high range. is formed. For this reason, the rear seat occupants listen to the sound source from the front speakers located further away from their seating position, and the distance to the sound source is set sufficiently. The radiated bass components with low directionality create a sense of spaciousness in the sound.

Example An embodiment of the present invention will be described below with reference to the drawings.

That is, in FIGS. 1 and 2, 11 is an audio source composed of an AN player, a cassette deck, a tuner, etc., and t2 is a preamplifier.

The R and L channels of the preamplifier 12 are connected to front speakers 15 and 1 via main amplifiers 13 and 14, respectively.
6 are connected, and the front speakers 15 and 16
Passenger '1 + M! is seated in front seat 2.3 in cabin 1.
They are disposed in front of the instrument panel 50 on both sides of the instrument panel 50. - Low-pass filters 17 and 18 as cut-off means are provided in the circuits of each channel branched on the output side of the preamplifier 12. It has the property of being filterable. A main amplifier 19 is connected to the low-pass filters 17 and 18.

20 are connected to rear speakers 21 and 22, and the rear speakers 21 and 22 are connected to the rear speakers MI#M! seated in the front seats 2 and 3. Doors 23 and 24 are located further back and in front of the passenger MMseM+ seated in the rear seat 8.
located at the front end of the

In this embodiment with the above configuration, the front speakers 15 and 16 reproduce the entire frequency band of the left and right channel signals output from the acoustic source 11, and the rear speakers 2 and 22 reproduce the low-pass filter. 17 and 18, the left and right channel signals below lK11z are reproduced. Therefore, front seat passenger M1
．． M obtains the reproduced sound including the mid-to-high frequency range emitted from the front from the front speakers 15 and 16, and at the same time obtains the reproduced sound emitted from the rear side speakers 21 and 22. At this time, since only the acoustic signal of 1 kHz or less that has been subjected to the low-pass filter 17.18' E-flit wave is input to the rear speakers 21 and 22 as described above, the rear speakers 21 and 22 have audible directivity. Certain high frequencies are not reproduced, and only low frequencies with low directionality are reproduced. Here, the rear speaker 21 shown in FIG.
, 22 f special is reproduced in all bands (actual #JA), and 5
When playing after cutting 00■2 or more (dotted chain line B)
The feeling of being enveloped in sound, that is, the magnitude of the feeling of being enveloped, is examined from a graph obtained through a paired comparison experiment.As can be understood from this graph, the Yasby force on the X axis is 21°22, and the front speaker Volume difference (dB) between 15 and 16 i - No matter how you set it, B is better than A when all bands are played, when 500) 1z or more is cut,
A higher sense of envelopment can be obtained. Therefore, the front K-th power NIL M+ * 4 is the NIL sound number over the entire frequency band of the front speakers 15 and 16, and at the same time a front-localized sound image is obtained. By regenerating the low-frequency sound reproduced from 21 and 22, a listening sensation that is enveloped in sound can be obtained.

On the other hand, for the rear seat occupants M, , M4, the front speakers 15, 16 and the rear speakers 21, 22 are both placed in the front.
The sound image for 3*M4 is necessarily localized to the front, and the sound image is localized near the front speakers 15 and 16 that reproduce the highly directional high-frequency range. Therefore, the rear seat occupant MS*M4 listens to the front speakers 15 and 16 that form the aforementioned sound image as the sound source, and as a result, the distance to the sound source is set sufficiently, and the actual sense of spaciousness is obtained due to this sufficient distance. Tomo ζko.

A pseudo sense of spaciousness can be obtained by the sound reproduced by the rear speakers 21 and 22 arranged oppositely on the left and right sides. Therefore, for rear seat occupants 4*'4, front speakers 15, 1
While obtaining a sound image closer to 6, a good sound field can be obtained due to the actual sense of spaciousness and the pseudo sense of spaciousness.

FIG. 4.5 shows another embodiment of the present invention, in which main amplifiers 25 are installed on both sides of the instrument panel 5.
, 26 are provided with side front speakers 27R and 28R, which reproduce the R channel signal amplified by the speakers 27R and 28R.
Further, in the center of the instrument panel 5, a center front speaker 30L is arranged to reproduce the L channel signal amplified by the main amplifier 4. Bypass filters 31 and 32 are provided in the circuits of each channel branched to the output side of the preamplifier 12. Sub-rear speakers 35, 36 are connected to the bypass filters 31, 32 via main amplifiers 33, 34, and the sub-rear speakers 35, 36 are
In this embodiment according to the above configuration, the front seat occupant M1 is placed near the rear speakers 21 and 22 at an appropriate angle so as to face the rear seat occupants M, , , M. 27R's R channel playback sound and center front speaker 30L's L channel playback sound cause passenger M! Sen, Tough I: rnt speaker 3
By the L channel reproduction sound of 0L and the R channel reproduction sound of the side front speaker 28R, stereo reproduction sound with a good left and right balance is obtained. However, in this way, the front seat occupant Ml e Mt listens to each front speaker 2.
7R, 28R, 3OL%If you set the volume to the appropriate level for listening, the rear seat passenger 4# M4 side will hear the rear speaker 21.
, 22 provides sufficient bass volume, but the f-character balance is a little lacking in the mid- and high-frequency ranges.

Therefore, when the mid-high frequencies filtered through the bypass filters 31 and 32 are reproduced through the sub-rear speakers 35 and 36, the balance is satisfied, especially for the rear seat occupant MS #M4, who lacks mid-high frequencies, and the rear seat occupant M! * Even with M4, you can obtain playback sound without missing music information over the entire band. At this time, since the sub-rear speakers 35 and 36 are directed toward the rear seat occupant MS*M4, the sound reproduced by the sub-rear speakers 35 and 36 is directed toward the front seat occupant M.
The sound 9 of I + '2 is not affected, and the above *
Similarly to the embodiment, each occupant MI+Ml+M,*M4 can obtain a feeling of being enveloped in sound and a sense of spaciousness by the low-frequency sound reproduced by the rear speaker.

In addition, in the above implementation side number, the rear speakers are 21°22
Although shown is a case in which it is placed on the rear door n, 24, it is also possible to place it on the rear pillar inner panel, or the fourth
, 5, the rear speakers 21, 2
2 and sub-rear speakers 35, 36, space efficiency can be improved by using a coaxial type speaker in which both speakers 21, 22, 35, 36 are coaxially integrated.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention provides a 7' front speaker force for reproducing each channel signal of the entire frequency band in front of the front seat occupant, while providing a 7' front speaker force behind the front seat occupant and in front of the rear seat occupant. It is possible to reproduce frequency bands below a predetermined frequency range or to install a multicast power. Therefore, for the front seat occupants, a front-localized sound image is obtained by the sound of the front speakers that reproduce the entire frequency band, and the sound image is influenced by the sound that reproduces the low frequency range with weak directionality and the sound of the speaker system. You can get the feeling of being surrounded by sound without any noise.

For rear seat passengers, the front
The sound reproduced by both rear speakers provides an inevitable frontal localization of the sound image, and the sufficient distance to the front speakers that forms this sound image creates an actual sense of spaciousness, and the bass of the rear speakers creates a false sense of spaciousness. This makes it possible to obtain an excellent sound field.

In addition, in the first embodiment shown in Fig. 4.5, the front seat occupants can individually obtain a well-balanced stereo sound, and even the rear seat occupants can hear the sub-rear speaker. The missing range is compensated for by the medium and high tones, and reproduced sound without missing musical information can be obtained over the entire band.

[Brief explanation of the drawing]

FIG. 1 is a block explanatory diagram showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram showing the speaker arrangement structure of the same embodiment, FIG. 3 is a graph showing the difference in volume between rear speakers and 70 ton speaker power - feeling of being enveloped, and FIG. 4 is a graph showing another embodiment of the present invention. A block explanatory diagram, FIG. 5 is an explanatory diagram showing the speaker arrangement structure of the same embodiment, FIG. 6 is a plan view showing the speaker arrangement structure of a conventional vehicle audio device, and FIG. 7 is a side view of the same. . 1... Vehicle interior, 2. 3... Front seat, 4... Rear seat, 6.
7゜15, 16...Front speaker, 9, 10
, 21, 22...Rear speaker, 11...Acoustic source, 17, 18...a -/< IX filter (cutoff means), 27R, 28R... (side)
Front speaker, 30L... (center) Front speaker, Ml m Ml + "l m M4... Passenger, 31, 32... Bypass filter. Fig. 1 Fig. 2 M Fig. 3 Fig. 3 Front speaker Big rumor ==> V Sudo-nn Tsurimasu Ichiriki and Frontos Ichiriki 770 colors!! (dB) Figure 6 Figure 7

Claims (2)

[Claims] (1) Front speakers for reproducing left and right channel signals are installed in front of the front seat occupant seated in the vehicle interior, and acoustic signals of all frequency bands output from the acoustic source are input to the front speakers. , a rear speaker is disposed between a front seat occupant and a rear seat occupant, and a cutoff means is provided for inputting only the acoustic signal having a predetermined frequency or less among the acoustic signals output from the acoustic source to the rear speaker. A vehicle acoustic device characterized by: (2) The frequency band filtered by the cutoff means is 1K.
The vehicle acoustic device according to claim 1, characterized in that the frequency is set to below Hz.