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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle acoustic reproduction system, and more particularly to an acoustic reproduction
system capable of improving the sense of localization.
2. Description of the Related Art As shown in FIG. 3, a conventional on-vehicle acoustic
reproduction system has two speakers 2a and 2b attached to the front door 1A or 1B (or
dashboard) of a car 1 and a rear tray 1E. In general, four-channel reproduction with two speakers
3a and 3b attached is also adopted.
However, in the above-mentioned conventional reproduction system, when looking at each seat
11A, 11B, 11C, 11D, each seat is at the center of the Lch and Rch speakers. There is a drawback
that the localization is biased because it is not located.
The present invention has been made in view of the above-described point, and the purpose is to
arrange a center speaker dedicated to each seat and to control the reproduction band and
reverberation time of the center speaker. An object of the present invention is to provide an onvehicle acoustic reproduction system capable of obtaining front center localization.
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, there is provided an on-vehicle acoustic reproduction system in which at least two or
more speakers are disposed in a vehicle compartment and stereo reproduction is possible. A
speaker for high-pitched sound is disposed at the front center of each seat, for example, at the
ceiling of a car, and a crossover signal is reproduced at a center localization signal having a
crossover frequency of 8 kHz or more. It can also be configured to add reverberation
corresponding to reverberation time.
A speaker for high-pitched sound is disposed at the front center of each seat, and the crossover
frequency is set to 8 kHz or more, and the center localization signal above the frequency is
reproduced. Thus, only the band of 8 kHz or more is reproduced By doing this, it is possible to
make it difficult to hear sounds in the vicinity of 4 kHz where the sensitivity of the ear is high,
and it is possible to secure a minimum band necessary for localization. A sense of stereotaxy is
Further, although it is necessary to make the high sound speaker as small as possible due to the
restriction on the mounting of the speaker, the size reduction is also possible by limiting the
reproduction band to 8 kHz or more. Thereby, it is possible to use a speaker that can also be
embedded in the ceiling and obtain a natural front center stereophonic sound field in each seat.
Furthermore, since the reverberation time of a frequency of 8 kHz or more is generally about
250 ms in a normal room, the reverberation time in the vehicle interior is sharply attenuated, so
a reverberation sound of about 250 ms corresponding to the reverberation time is By adding it to
the reproduction signal, it becomes possible to reproduce a natural feeling of sound field similar
to a normal room.
acoustic reproducing speaker according to the present invention will be described with reference
to FIGS. 1 and 2. The same reference numerals as in the conventional part described in FIG. The
explanation is omitted. FIG. 1 is a schematic plan view of a car implementing the sound
reproduction system of the present invention. In the figure, 1 is a car, 2a and 2b are speakers for
the whole band attached to the front doors 1A and 1B, 3a and 3b are speakers for the whole
band attached to the rear tray 1E. Reference numerals 4a to 4d denote high-pitched reproduction
speakers disposed on the ceiling of the car so as to be located in front of and in the center of the
respective seats 11A, 11B, 11C, 11D, and each speaker serves as a center speaker for each seat
There is.
The speakers 4a to 4d are connected as shown in FIG. In FIG. 2, the signal from the head unit 5 is
divided into the front side and the rear side, the signal on the front side is further divided into L,
R and a center signal C by the processor 6, and the R signal is transmitted to the speaker 2a
through the amplifier 7a. The signal is applied to the speaker 2b through the amplifier 7b, and
the center signal C is applied to the speakers 4a to 4d through the amplifier 7c. At this time, the
center signal is a signal of 8 kHz or more as a band, and additionally, reverberation
corresponding to a reverberation time of 250 ms is added. On the other hand, both the L and R
signals are applied to the speakers 3b and 3a through the amplifier 7d.
The speakers 2a, 2b and 3a, 3b are in normal 4-channel reproduction, and it is difficult to obtain
a good front center localization only by the output from these speakers, but the speaker 4a which
is the center speaker of each seat By using ~ 4d, it is possible to obtain good forward centering in
each seat and also to obtain a natural sound field feeling.
According to the present invention, according to the on-vehicle acoustic reproduction system, the
high-pitched speakers are disposed at the front center of each seat, and these are the center
speakers of each seat. Since the sound to which reverberant sound corresponding to a
reverberation time of about 250 kHz is added at 8 kHz or more is reproduced, it is possible to
obtain a front centering feeling without being conscious of the center speaker more than
necessary, and to obtain a normal room It is possible to obtain the same sense of sound as the
reproduction inside.
In addition, since the reproduction band of the center speaker is limited, the size of each center
speaker can be reduced, and the restriction on mounting can be extremely reduced. Therefore,
the present invention is suitable as this type of on-vehicle acoustic reproduction system.
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