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JPH0550899

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DESCRIPTION JPH0550899
[0001]
BACKGROUND OF THE INVENTION In the present invention, for example, when there is a
difference in the distance between the mid-high range speaker and the low-range speaker with
respect to the listening position as in a car-mounted speaker device, etc. The present invention
relates to a sound reproducing apparatus capable of obtaining a good reproduced sound with
little incongruity by compensating for differences in arrival time in the sense of hearing between
middle, high, and low frequencies.
[0002]
2. Description of the Related Art Conventionally, for example, for low-frequency speakers (11)
are installed in a rear parcel 14 as shown in FIG. The speaker (12) is often attached to the front
right and left inside the vehicle interior such as the inside of the front door 13. In such a case, the
distance r1 from the low frequency speaker (11) to the listening position P and the arrival time
t1 Because the distance r2 from the mid-high range speaker (12) and the arrival time t2 are
different, the low-range playback sound arrives delayed by T0 = t1-t2 with respect to the midhigh range playback sound, and the crossover frequency Interference causes dips to deteriorate
the timbre, and makes the listener feel uncomfortable. In order to eliminate such a drawback,
conventionally, a means for compensating for the delay of the low frequency reproduction sound
has been put into practical use by inserting a signal delay device in the middle and high
frequency channels.
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1
[0003]
[0003] Since the conventional compensation having such a structure only guarantees a time
delay corresponding to the distance difference between the middle and high frequencies and the
low frequency, a reflected sound can be obtained. There is a problem to be solved that the sense
of incongruity caused by the sensory phenomenon that the bass sounds delayed due to the state
of the standing wave or the frequency is not resolved.
[0004]
Therefore, the present invention solves the drawbacks of the prior art and sets the delay time so
as not to sense the time difference between the middle and high frequencies and the low
frequency as the sense amount at the listening position, and substantially It is an object of the
present invention to provide a sound reproducing apparatus which solves the problems of the
conventional example by performing phase correction on mutual interference caused by a time
difference.
[0005]
SUMMARY OF THE INVENTION The sound reproducing apparatus according to the present
invention for achieving the above object will be described with reference to FIGS. 1 to 5 showing
an embodiment, wherein the present invention is a multi-way type. And a crossover circuit for
delaying the reproduced sound of the middle / high band speaker 2 relative to the reproduced
sound of the low band speaker 1 at the listening point P, and a crossover frequency. And a phase
shifter 4 for correcting the phase difference between the adjacent two reproduction sounds. In
the first embodiment, the phase shifter 4 is connected to a middle / high band reproduction
system in the first embodiment. The second embodiment is characterized in that it is connected
to a low band reproduction system, and in the third embodiment, the delay circuit 3 is a middle /
high band reproduction system and the phase shifter 4 is low. Range playback system and middle
/ high range playback system Characterized in that it is s connected.
Furthermore, as a variation of each embodiment, the delay amount of the delay circuit 3 and the
phase correction amount of the phase shifter 4 are variable stepwise or continuously.
[0006]
In the sound reproducing apparatus having such a configuration, the difference in arrival time to
the listening point of the reproduced sound of the low band speaker 1 and the reproduced sound
of the middle / high band speaker 2 and the sensory low The delay of the tonal range is
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2
corrected by the delay circuit 3 and such substantial setting of the time difference causes a large
phase difference, and the dip on the frequency characteristic generated at the crossover
frequency is low, middle and high region by the phase shifter 4 It can be eliminated by correcting
the phase of either or both channels.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows the construction of a first
embodiment of the present invention, in which 1 is a speaker for low frequency reproduction and
2 is a speaker for middle to high frequency reproduction.
[0008]
A delay circuit 3 for relatively delaying the reproduction sound of the middle / high band speaker
2 to the reproduction sound of the low band speaker 1 at the listening point P in the channel of
the middle / high band speaker 2, and a crossover frequency It is connected to the phase shifter
4 that corrects the phase difference between the two adjacent playback sounds.
[0009]
Although the delay circuit 3 is a usual delay circuit using a BBD element in this embodiment, it
may be a device using other means.
The delay time of the delay circuit 3 not only compensates for the time difference corresponding
to the distance difference between the low band and the middle high band to the listening
position as described above, but also compensates for the low band delay due to the difference
between the low band and the middle high band According to the experimental results, if the
speakers are arranged as shown in FIG. 6 and the listening position is the driver's seat, 20 to 40
msec is appropriate.
In this delay time, as described above, the delay amount corresponding to the distance difference
and the delay amount corresponding to the low range delay due to the difference in the sense are
added.
[0010]
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3
Reference numeral 4 denotes a phase shifter for correcting the phase difference between the
reproduced sound in the vicinity of the crossover frequency. In this embodiment, although a
phase shifter based on ordinary digital signal processing is used, an analog circuit is used. It may
be a device.
This phase shifter 4 has the purpose of correcting the phase difference between the low and
middle high frequency reproduced sound in the vicinity of the crossover frequency to improve
the frequency characteristic of the reproduced sound at the listening position. π to π
[0011]
Reference numeral 5 in the drawings denotes an amplifier for driving each speaker, and although
omitted in the drawing, a high-pass or low-pass filter for passing a frequency band corresponding
to each channel is provided. It is combined.
[0012]
FIG. 1 shows a second embodiment in which the delay circuit 3 is connected to the middle / high
band reproduction system, and the phase shifter 4 is connected to the low band reproduction
system.
[0013]
FIG. 3 shows a third embodiment in which the delay circuit 3 is connected to the middle and high
band reproduction system, and the phase shifter 4 is connected to the low band reproduction
system and the middle and high band reproduction system, respectively. This is a configuration
that enables phase matching in both the middle and high band reproduction systems.
[0014]
4 and 5 show a modification of each of the above embodiments, in which the delay amount of the
delay circuit 3 and the phase correction amount of the phase shifter 4 are switched stepwise by
the switch S according to the place of use (FIG. 4) ) Or is continuously variable (FIG. 5) as
indicated by the dotted arrow Va
[0015]
Although FIGS. 4 and 5 show modifications of the first embodiment, it goes without saying that
similar modifications can be applied to the second and third embodiments.
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[0016]
Although the sound reproducing apparatus according to the present invention has been
described in detail based on the embodiment considered to be representative, the embodiment of
the sound reproducing apparatus according to the present invention is not limited to the
structure of the above embodiment. Rather, it can be appropriately modified and implemented as
long as it has the configuration requirements described in the above-mentioned utility model
registration request, exhibits the action according to the present invention, and has the effects
described below.
[0017]
[Effect] The sound reproducing apparatus according to the present invention has not only the
time delay corresponding to the difference in distance between the listening position and the
high-frequency sound source and the low-frequency sound source, but also there is no time
difference as a sense quantity. Since the time delay between the two sound sources is corrected,
the user does not feel discomfort due to the time shift due to the frequency band of the
reproduced sound.
[0018]
Furthermore, the phase difference between the two sound sources is corrected by the phase
shifter, and dips on the frequency characteristics caused by the phase-like mutual interference of
the two sound sources near the crossover frequency are eliminated to improve the frequency
characteristics. it can.
The above advantages have the effect of enabling natural stereo reproduction with excellent
timbre.
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