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JPS62268752

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DESCRIPTION JPS62268752
[0001]
Application field of the present invention The present invention makes it possible to obtain a
clear sound group localized on the front while experiencing the sense of hearing enclosed in the
sound by both the front and rear seats seated in the car guide. The vehicle acoustic equipment e
# relates to. Prior Art A conventional single-use acoustic device having a structure shown in FIG.
6.7 is practically used 1 (August 1958 Nissan Motor 4 issue ?uxssAN + -screw circumferential
shaft? No. 489, See page V-43). That is, in the single room 1, front seats 2, 3 and a rear seat 4
are fixed. A 70-ton speaker 6.7 is provided in a pair on both the 11Q of the instrument panel 5
disposed in front of the front seat 2.3, and is also disposed laterally behind the rear seat 4 Rear
speakers 9 and IO are disposed on both sides of the eight. In such a configuration, all frequency
bands of left stone channel signals output from an acoustic source (not shown) are reproduced
from the front speakers 6.7 and the rear speakers 9 and 10, thereby the front seats 2, 3 and the
rear seats 4 An occupant M seated on the. The Mt 1 M 11 M 4 is capable of obtaining a feeling of
reception @ wrapped in a sound by the reproduction sound of each of the speakers 6.degree.
However, in the case of such a conventional device, the sense of hearing enclosed in the sound by
the reproduction sound of each of the speakers 6.7.degree. On the other hand, in the case of the
front seat occupants M, M, L, the sound image to be formed on the front of the self by the front
speaker 6.7 is influenced by the reproduction sound of the rear speakers 9, 10 emitted from the
rear. As a result, it is not possible to obtain a clear sense of frontal localization of the sound
image. -In the rear seat occupant MS * M4, the sound image is localized on the rear surface
without front localization due to the reproduction sound of the rear speaker 9 ░ 10, and the
distance to the sound source (rear speaker 9 ░ 10) is extremely short. As a result, the
reproduced sound comes directly to the ear, and it is not possible to obtain a feeling of spread
that occurs by setting an appropriate distance to the sound source. SUMMARY OF THE
INVENTION The present invention has been made in view of such conventional problems, and a
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front speaker for reproducing left and right channel signals is provided in the previous issue of a
front passenger seated in a vehicle compartment. The rear speakers are disposed between the
front seat occupant and the rear seat occupant while the acoustic signals of the entire frequency
band output from the sound field source are input to the front loudspeakers, and the rear
loudspeakers are disposed on the rear loudspeakers. A cutoff means is provided for inputting an
acoustic signal of a predetermined frequency or less among the acoustic signals outputted from
the acoustic source.
In the above configuration, the front seat occupant can obtain a sound image localized in the
front by the reproduction sound of the front speakers provided in front of the front speaker, and
can be disposed behind the front seat occupant or surrounded by sound by the reproduction
sound of the yaspy force Good listening experience. At this time, since an acoustic signal having a
predetermined frequency or less is inputted to the rear speaker, only a low-pitched bass range is
reproduced without reproducing a treble band having directivity in the sense of hearing.
Therefore, the front seat occupant can obtain a sense of hearing surrounded by the sound by the
reproduction sound of the rear speaker while securing the sound image localized in the front by
the reproduction sound of the front speaker. On the other hand, for the rear seat occupants, since
the front and rear speakers are disposed in front, the sound image is necessarily localized to the
front, and the sound image is closer to the front speakers that reproduces the entire frequency
band including the middle and high frequencies. Is formed. For this reason, the rear seat
passenger listens to the front speaker disposed far from the seating position of the rear seat as a
sound source, the distance to the sound source is sufficiently set, and the sufficient distance to
the sound source The low directivity low-pitched component emitted gives a sense of sound
spread. Embodiment An embodiment of the present invention will be described with reference to
the drawings. That is, in FIGS. 1 and 2, 11 is an acoustic source constituted by an player, a
cassette deck, a tuner and the like, and t2 is a preamplifier. Front speakers 15 and 16 are
connected to the R and L channels of the preamplifier 12 via main amplifiers 13 and 14, and the
front speakers 15 and 16 are seated on the front seat 2.3 in the passenger compartment 1 Crew
'1 + M! The front side of the instrument panel 50 is disposed on both sides of the instrument
panel 50. The low-pass filters 17 and 18 serving as cut-off means are provided in the circuit of
each channel branched on the output side of the pre-amplifier 12 and the low-pass filters 17 and
18 have only a frequency band of 1 KHz or less It has the characteristic that it can repel. ???
???????????????????????? Rear speakers 21 and 22 are connected
through 20, and the rear speakers 21 and 22 are occupants MI #M! It is disposed at the front
end portion of the @ part doors 23 and 24 which are further rearward and more forward than
the raised MMse M + sitting on the rear seat 8. In the present embodiment according to the
above configuration, the front speakers 15 and 16 reproduce the entire frequency band of each
of the left and right channel signals output from the sound source 11, and the rear speakers 2
and 22 have low pass filters. The left and right channel signals of 1K11z or less filtered by 17
and 18 are reproduced.
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Therefore, front seat passenger M1. M obtains reproduced sound including middle and high
frequency range radiated from the front speaker 15 ░ 16 from the front, and at the same time
obtains reproduced sound emitted from the rear side and from the rear side. At this time, only
the acoustic signal of 1 KHz or less which is the low-pass filter 17.18 'E-flit wave is inputted to
the yaspicy force 21 ░ 22 as described above. Some treble range is not reproduced, only low
directivity low range is reproduced. Here, when the f feature of the rear speakers 21 and 22
shown in FIG. 3 is reproduced in full band (real # JA) and when it is reproduced by cutting 500 2
or more (in the alternate long and short dash line B) The size of the sense of hearing, that is, the
sense of envelopment, is examined from a graph comparing the magnitude of the sense of
envelopment by a pair comparison experiment. As understood from this graph, Even if the
volume difference (dB) i-is set, a higher sense of wrapped feeling can be obtained as a sense
quantity when B or more is cut by 500 or more than A when reproducing all bands. Therefore,
the front K power NIL M + * 4 is a rear speaker, as understood from the above-mentioned class 7
simultaneously with obtaining a sound image localized in front by the front sound 15 and 16 by
the Nisei note band which spans the entire frequency band The low-frequency range regenerated sound reproduced from 21 and 22 provides a sense of hearing enclosed in the sound.
On the other hand, since the front speakers 15 and 16 and the rear speakers 21 and 22 are both
arranged forward in the rear seat occupants M, M and M4, the sound image for the rear seat
occupant M3 * M4 is inevitably front The sound image is localized near the front speakers 15
and 16 for reproducing high-pitched sound with strong directivity. Therefore, the rear seat
occupant MS * M4 listens to the front speakers 15 and 16 that form the above-described sound
image as a sound source, and as a result, the distance to the sound source is sufficiently set.
Tomoko. The reproduced sound of the rear speakers 21 and 22 provided on the left and right
sides can provide a pseudo-spread feeling. Therefore, in the rear seat passenger 4 * '4, a good
sound field can be obtained by the sense of actual spread and the sense of pseudo spread while
obtaining a sound image near the front speakers 15 and 16. FIG. 4.5 shows another embodiment
of the present invention, and on both sides of the instrument panel 5, side front speakers 27R
and 28R for reproducing the R channel signal amplified by the main amplifiers 25 and 26 are
provided. A center front speaker 30L that reproduces the L channel signal amplified by the main
amplifier 4 is disposed at the center of the instrument panel 5.
In the circuit of each channel branched to the output side of the pre-amplifier 12, bypass filters
31, 32 are provided. Sub rear speakers 35 and 36 are connected to the bypass filters 31 and 32
through main amplifiers 33 and 34, respectively, and the sub rear speakers 35 and 36 are
directed to the rear seats M, M, and M, respectively. In the present embodiment according to the
above configuration according to the above configuration disposed in the vicinity of the rear
speakers 21 and 22 with an appropriate angle, the front seat occupant M1 is the R front channel
27 R's reproduction sound and the center front speaker 30. Also by the L channel reproduction
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sound of L, crew M! The left and right balanced stereo reproduction sounds are obtained
respectively by the L channel reproduction sound of the speaker 30 L and the R channel
reproduction sound of the side front speaker 28 R. However, when the front seat occupant Mle
Mt is set to an appropriate volume for listening to the front speakers 27R, 28R, 3OL% as
described above, the rear speakers 21 and 22 on the rear seat occupant 4 # M4 side have
sufficient sound with regard to bass Although it becomes a volume, it becomes a special balance
of a shortcoming about middle and high range. So, when middle and high tones filtered by the
bypass filters 31 and 32 are reproduced by the sub rear speaker 35 ░ 36, the special balance is
satisfied in the rear seat occupant MS # M4 side with a slight tendency regarding the middle and
high tones, and the rear occupant M! * Even in the M4, you can get playback sound without loss
of music information over the entire band. At this time, since the sub-rear speakers 35, 36 are
directed to the rear seat passenger MS * M4, it is possible that the sound 9 of the front seat
passenger MI + '2 is affected by the reproduced sound of the sub rear speakers 35, 36. Also, as in
the above-mentioned * example, each crew member MI + Ml + M, * M4 is the 'no' that the hearing
sense and the spread feeling of the sound which were included are obtained by the low
frequency playback sound of the rear speaker. In the above embodiment, the rear speakers 21 ░
22 are disposed at the rear doors n, 24. However, they may be disposed at the rear pillar inner
panel, as shown in FIGS. In the case where the rear speakers 21 and 22 and the sub rear
speakers 35 and 36 are used in combination as in the above embodiment, if a coaxial type
speaker in which both the speakers 21, 22, 35 and 36 are coaxially integrated is used, Efficiency
can be improved. As described in detail in the invention, the present invention provides the front
seat occupants with a 7 'lon tossic force for reproducing each channel signal of the entire
frequency band in front of the front seat occupants, while behind the front seat occupants and in
front of the rear seat occupants. In order to reproduce the frequency band below a
predetermined level or to provide a yaspicious force.
Therefore, in the front seat occupant, a sound image localized in front is obtained by the sound of
the front speaker reproducing the entire frequency band, and the sound image is influenced by
the sound of the low sound area with weak directivity You can get a sense of listening without
being overwhelmed. In the case of the rear seat occupants, the natural localization of the sound
image is obtained by the reproduced sound of the front and rear speakers both located forward,
and the actual distance to the front speaker forming this sound image is sufficient. An excellent
sound field can be obtained by the sense of spread and the sense of pseudo spread due to the
bass of the rear speakers. In addition, in the first embodiment shown in FIG. 4.5, the front seat
occupant can obtain stereo reproduction sound balanced left and right individually, and the sub
rear speaker even in the rear seat occupant. The middle and high-pitched sound compensates for
the insufficient sound range, and a reproduced sound without loss of music information can be
obtained over the entire band.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an
illustration showing a speaker arrangement structure of the embodiment, and FIG. 3 is a volume
difference between a rear speaker and 70 instoppy force-wrapped feeling Graph showing
characteristics, FIG. 4 is a block diagram showing another embodiment of the present invention,
FIG. 5 is a diagram showing a speaker arrangement structure of the embodiment, and FIG. 6 is a
conventional vehicle acoustic system The top view which shows a speaker arrangement
structure, FIG. 7 is the same side view.
1 ... car room, 2.3 ... front seat, 4 ... rear seat, 6.7 ░ 15, 16 ... front speakers, 9, 10, 21, 22 ... rear
speakers, 11 ииии Sound source, 17, 18 ... a ? / <IX filter (cut-off means) 27 R, 28 R иии (side) front
speaker, 30 L иии (center) front speaker, M l m M l + "L m M 4 ... passenger, 31, 32 ... bypass filter.
Fig. 1 Fig. 2 M-f Fig. 3 Two-speaker big rumor == ? V ?-? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? !! ! (DB) Fig. 6 Fig. 7
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