JPS63217899

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DESCRIPTION JPS63217899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to invehicle audio reproduction Vt, and more particularly to an in-vehicle audio reproduction
apparatus for Hi Fi sound field. 2. Description of the Related Art In the conventionally known
vehicle-mounted audio reproducing apparatus, the speaker system is mounted on a dash-board,
rear parcel tray, etc., and the left and right speaker systems are located near both ends of the
vehicle to separate them. Be placed. However, in the case of a vehicle-mounted sound field, the
orderer of the listener is either the driver's seat or the passenger's seat, and either the left or
right of the rear seat, and the reproduced sound on the center line of both left and right speaker
systems like a home stereo device. It is impossible to listen to the sound, for example, when
listening to the playback sound by a speaker system attached to a dash board, the left and right
speaker systems are too close. 2. There is a sound pressure phase difference between the left and
right speaker systems. The localization of the sound becomes unnatural because of things like
that. The same is true when the speaker system is attached to the rear parcel tray, and in
particular, the localization is unnatural in the rear seat. In addition, although the speaker system
is also attached to the door of the vehicle and the kick board, the sound pressure of the left and
right speaker systems is masked by the passenger and the sound axes of the left and right
speaker systems face each other. The left and right sounds cancel each other, and a speaker with
good directional characteristics is required. In short, the following problems remain in the
conventional sound reproduction '4A'. (2) The space between the left and right speaker systems
is not sufficient, and both are too close. Φ) There is a sound pressure phase difference between
the left and right speaker systems. Therefore, the localization of the sound is unnatural. [Means
for Solving the Problem] Therefore, in consideration of the peculiarity of the in-vehicle sound
reproducing device, the present invention improves the directivity characteristic and
incorporates 4 + as to 100 IIIS delay circuit in one speaker system, The sound pressure level
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difference between the left and right speaker systems is configured to be ± 3 dB between the
driver's seat and the front passenger seat. In a vehicle, the distance between the left and right
speaker systems is about 0.511 to 1 m, the arrival time of the sound from the sound source to
the listener is about 0.15 s + s to 0.3 + es (sound speed 340 m / s), and the delay time is The
sound pressure of the delayed speaker system needs to be 4 w + sg or more so that the sound
pressure difference between the delayed speaker system and the delayed speaker system is 10
d3 or more. The upper limit is 100 m5 or less below which sound is completely separated as an
echo.
Next, an embodiment of the present invention will be described with reference to the attached
drawings. First, in FIG. 1, etc., reference numeral 1o denotes a vehicle, and 11 denotes the
dashboard, and in FIG. 1, speakers SL and SR for LCH and RCH are arranged on the left and right
of the dashboard 11, and the speakers of each channel As SL and SFL, as the two-side pair, the
sound axis is inclined toward the center of the cabin with the outer one of the pair of speakers SL
and SH. Further, in this drawing, reference numeral 12 denotes a driver's seat, 13 denotes a
passenger seat, 12P denotes a driver, and 13P denotes a passenger. FIG. 2 shows an
improvement in directivity characteristics by mounting an acoustic lens L on the outer speakers
SLt and 5FLt among the speakers SL and Sp of each channel. Instead of this acoustic lens, an
equalizer or the like may be used. FIG. 3 shows that the shielding sound B is provided outside the
speakers SL and 312 outside the speakers SL and 312 of each channel and SRt so that the
radiation sound is refracted, and FIGS. 4 and 5 are speakers for each channel The delay circuit
DL is incorporated into one of the SL and 83 groups, and the same reference numerals as in the
embodiment of FIG. 1 denote the same parts in the above figures. Fig. 6 shows the time
difference and sound pressure difference of sounds heard by the listeners' ears. Fig. 7 shows the
output sound pressure characteristics of the right speaker in comparison with the conventional
example, not showing a diagram, and Fig. 8 the left. It is a graph which shows the output sound
pressure characteristic of a speaker compared with a prior art example, Comprising: It turns out
that sound pressure is flat in a high region. In the above explanation, the speakers on the left and
right channels are attached to the front dashboard board of the driver etc., but it is also
applicable to the case where they are attached to the rear parcel tray, door, kickboard, etc. it can.
As is apparent from the above description, according to the on-vehicle acoustic reproducing
apparatus of the present invention, each channel is reproduced by a plurality of speaker systems,
and at least one of the speaker system groups of each channel is sounded. The sound axis is
directed to the center of the field, and an acoustic lens, a horn, an equalizer, and a shielding plate
are provided, and the sound pressure level difference between the left and right speaker groups
averages ± 3CIBL /, at the driver's seat or the passenger's seat Since the delay circuit is
connected to the speaker, the following effects can be obtained. The sound pressure phase
difference of the left and right speaker system is improved, and the localization is stabilized. 2 、
The spread of sound comes out by appropriate delay. 3, the localization of the sound is
confirmed, and natural tu F + sound can be obtained. There is no change in sound quality
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depending on the seat.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an explanatory view of a vehicle plane in which the sound axis is inclined with one of the
left and right channel speaker system groups toward the center of the sound field, and FIG. 2 is
an explanatory view of the vehicle plane using an acoustic lens. 3 and 4 are explanatory views of
a vehicle plane using the same shielding plate, FIG. 4 is an explanatory view of a vehicle plane
using a delay circuit, and FIG. 5 is an explanatory view of a speaker drive circuit of each channel,
FIG. FIG. 7 is a diagram showing the relationship between the time difference between both ears
and the sound pressure, and FIGS. 7 and 8 are output sound pressure characteristic diagrams
showing the output sound pressure characteristics of the left and right speaker systems in
comparison with the conventional device.
10: vehicle, 11: dash board, 12: driver's seat, 13: passenger's seat, SL, SR: speaker group of left
and right channels. Figure 1 Figure 3 Figure 4
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