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JPS62294399

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DESCRIPTION JPS62294399
[0001]
Detailed Description of the Invention Field of the Invention The present invention relates to a
sound reproducing apparatus for improving acoustic characteristics. 2. Related Art In recent
years, there has been a trend of sound field improvement such as improvement of presence by
more spill force reproduction such as 4 speaker box, 6 speaker cone, 6 speaker cabinet, 6
speaker box, etc. for speaker reproduction in home audio. With regard to on-vehicle audio, along
with the recent hi-fi, the conventional two-speaker playback system has become a four-speaker,
six-speaks one-by-speaker system, with uniform hi-fi including not only front seats but also rear
seats. Sound is sought 7. Hereinafter, an example of the above-mentioned conventional sound
reproduction apparatus will be described with reference to the drawings. Fig. 16 ? Earth Fig. 16
shows an example of a conventional four-speaker system mounted on a car, and shows a car
viewed from-1---). 1, 1 is a front seat groove speaker, 2, 2-a front seat, 3 3 is a rear seat groove
speaker, 4 is a rear seat, 6 is a playback device for generating an electrical signal to be played,
this output is It is connected to the seat groove speakers 1, 1 and the rear seat groove speakers
3, 3 and the reproduction sound is output from the front seat groove speakers 1, 1 from the rear
seat groove speakers 3, 3. The operation of the sound reproducing apparatus configured as
follows will be described below. Signals sent from the reproduction device are reproduced from
the front seat groove speakers 1 and 1 to the front seats 2 and 2 and from the rear seat groove
speakers 3 and 3 to the rear seat 4. As a result, the front seats 2, 2 and 4 rear seats can listen to
the Pf raw sound at a proper volume, and the front seat ditch speakers 1, 1 compared to the twospeaker system without a swing, the front seats The problem that the invention tries to solve is
that the problem that the volume of the rear seat 4 is too high is eliminated at the proper volume
of 2 and 2. However, in the configuration as described above, from the mounting conditions in
the vehicle, Both the seat groove speakers 1 and the rear seat groove speakers 3 and 3 have a
sufficient speaker volume and sufficient sealing performance, so that there is a problem that the
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low frequency sound becomes insufficiently reproduced. . Therefore, as shown in FIG. 17, the
speaker volume and the sealing performance of the rear tray 7 are added by adding 6 woofers 6
6 6 using the rear tray 7 as the 5's scaker 5 'и и и It was made to do the sound enhancement.
However, although this system enhances the reproduction of low-frequency sound, it has the
problem that the low-frequency sound volume at the rear seat 4 is too high when adjusted to the
appropriate low-frequency sound in the front seats 2 and 2 . The present invention provides a
sound reproducing apparatus in which the sound pressure frequency characteristics at the front
seat and the sound pressure frequency characteristics at the rear seat are aligned.
In order to solve the above problems, in order to solve the above problems, the sound
reproducing apparatus according to the present invention comprises: phase changing means for
signals; a speaker for reproducing an electric signal of a reproduction device; and signals from
the phase changing means. The system is equipped with the following speakers. In the
configuration described above, the sound pressure frequency characteristic of only the original
signal can be varied by combining the original signal of the playback device and the phase
change signal in the acoustic space. Since the effect can be changed depending on the
combination and arrangement of the original signal reproduction speaker and the phase change
signal reproduction speaker, it becomes possible to make the sound pressure frequency
characteristics in each listening place uniform. Embodiment Hereinafter, a sound reproducing
apparatus according to an embodiment of the present invention will be described with reference
to FIG. FIG. 1 shows a vehicle-mounted sound reproducing apparatus, showing a car viewed from
above, 8 shows the outline of the car, 9 is a steering wheel, 10.10 is a front seat, 11 rear seats,
12. Reproduction devices such as 12-car radio and car tape decking, 13.13 is a front seat groove
speaker, 14.14H: a rear seat groove speaker, 16 is a woofer speaker, and 16 is a phase change
means. With such a configuration, the signal of the reproduction device 12 generating an electric
signal corresponding to the sound to be reproduced is reproduced from the front seat groove
speaker 13113 and the rear seat groove speaker 14 ░ 14 respectively. From there, the phasechanged signal is reproduced through the phase change means 16. In this example, the phase
changing means 16 changes the phase of the right and left signals by measuring 1-1 and then
transmits a monaural signal by the woofer speaker 151. Because the low-frequency sound has
less directivity to the reproduced sound from the front seat groove speaker 13.13 mainly in the
front seats 10 and 10, the reproduced sound from the woofer speaker 15 is added and heard, so
the woofer speaker 16 The sound pressure frequency characteristics in the low range can be
extended compared to when there is no r, and the reproduction sound of the woofer speaker 15
is added to the reproduction sound of the rear seat groove speaker 14.14 in the same manner in
the rear seat 11 as well. It is possible to extend the sound pressure frequency characteristics in
the low range. If the woofer speaker 15 is reproduced without passing through the phase
changing means 16 while 1-squeezing is performed, the distance to the listening point is
different. Therefore, as shown in FIG. As a result of flattening the entire sound pressure
frequency characteristic C at the rear seat 11, the speaker 14 for the rear seat groove 14 is
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aligned with the .gamma.f pressure wheel A of the front seat groove speaker 13.degree. Since the
low-frequency sound reproduction level B of the woofer speaker 15 is larger than the
reproduction level D of .14, the low-frequency level is raised and the sound pressure frequency
characteristic is flat as shown by E as a whole. become unable.
However, assuming that the signal of the woofer speaker 16 is a phase change signal, the phase
shift ? ? from the original noboru is changed so as to approach +1800 by 1818 as it goes from
the crossover frequency to the low frequency range, The cancellation effect between the rear seat
groove speaker 14 ░ 14 and the reproduction sound of the woofer speaker 16 becomes a dog,
and the rear seat groove speaker 14.14 n reproduction sound level cancels regardless of the
attenuation from the crossover frequency. Since the amount also increases, the shaded portions A
and B in FIG. 3 cancel each other out, and the sound pressure of the rear seat 11 made up of the
reproduction level B of the woofer 15 and the reproduction level D of the rear seat groove
speaker 14.14. The frequency characteristic F can be made flat. On the other hand, in the front
seat 10.10, since the distance from the woofer speaker 16 is larger than that in the rear seat 11,
the woofer reproduction level becomes smaller and the influence of the phase shift of the woofer
reproduction sound to the front seats 10, 10: Since there are few and the phase also changes
compared to the rear seat, it is possible to set the cancellation effect to the minimum. Therefore,
in both the front seats 10 and 10 and the rear seat 11, flat sound pressure frequency!
Characteristics can be obtained, and uniform sound reproduction of front and rear seats can be
realized. FIG. 4 shows an example of measurement data obtained by implementing the present
invention on a passenger car, wherein A indicates the sound pressure frequency characteristic at
the listening point at the front seat and B at the rear seat. The front seat speaker sound is added
to the front seat speaker sound in the front seat, while the rear seat speaker sound attenuates the
woofer speaker sound in the rear seat. The rear seat is well balanced as a comprehensive sound
pressure characteristic. In addition, regarding the location of the cup of the woofer speaker 15,
as shown in FIG. 5, when installed in the rear tray 17, the volume of the trunk room can be used,
so that relatively heavy bass can be reproduced relatively easily. However, when the rear tray 17
is not provided, the box speaker 18 may be disposed below the front seat 10 as shown in FIG. 6
or may be attached to the back of the center console 19 as shown in FIG. In the case of the back
of the center console 19, in particular, the rear and left and right portions of the one-half speaker
16 are surrounded, so that efficient reproduction is possible by the baffle effect. When the rear
seat groove speaker 14.14 is mounted on the rear tray 17, the rear door position WK woofer
speaker 16 may be installed as shown in FIG. Next, FIG. 9 shows an example of the phase shifter
16, and FIG. 11 shows an example of the delay circuit.
FIG. 9 shows the same wave number f, and 2 ?, as shown in FIG. 10, using an operational
amplifier 2Q and an OR first-order phase shift circuit using resistors R and RG, RF and a capacitor
C. After that, it can be delayed to 1800 and can be set freely by combining the required band as
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the woofer speaker 15 and the delay amount of the I * phase with the constant of OR or any
other filter. Then, as shown in FIG. 11, the buffer amplifier 21 and the low pass filter 22. High
pass filter 23. ?????? By the circuit of the power amplifier 25, for example, frequency
characteristics can be made as shown in FIG. 12 and phase characteristics can be made as shown
in FIG. As a result, when the original signal is mixed acoustically, f, in the lower band, is added to
the original signal f. As the frequency becomes higher, the subtraction effect becomes a dog. FIG.
14 shows the buffer amplifier 26. High-pass filter 27, delay circuit 28. Low pass filter 29. In the
example of the delay circuit system consisting of the power amplifier 30, by narrowing the
necessary band and applying a constant delay t, for example, when f is delayed by 90 ░, the
delay is 2fo by 1800 and the ratio shown in FIG. Thus, a sudden phase shift can be obtained. As
described above, according to the present embodiment, by combining the reproduction sound of
the original signal reproduction speaker and the phase change signal reproduction speaker using
the phase changing means 16, uniform sound pressure frequency characteristics for each
listening place can be obtained. It can be realized. Although the reproduction of the phase change
signal is performed by the woo-speaker 16 in the embodiment, this idea may be applied to other
speakers 17. Further, the signal of the woofer speaker 16 may be not a signal for the rear seat
but a signal for the front seat. 1) Furthermore, the phase changing means 16 is provided in the
reproduction device 12 for generating an electric signal, and the original seat signal, for example,
the front seat channel is changed in phase, and this and the phase of the woofer which was the
embodiment. Introducing the change signal Jl can be more effective. As described above,
according to the present invention, by providing phase change means, an original signal
reproduction speaker, and a phase change signal reproduction speaker, uniform flat sound
pressure frequency characteristics can be obtained on both the front and rear seats. It can be a
dog of industrial value.
[0002]
Brief description of the drawings
[0003]
Fig. 1 is a schematic block diagram showing an embodiment of the sound reproducing apparatus
according to the present invention, and Fig. 2 is a sound pressure frequency of front and rear
seats when front and rear sounds before improvement are mounted on a passenger car 5 to 8 are
explanatory views showing mounting examples of the woofer speaker according to the present
invention, FIG. 9 is an electric circuit diagram showing an example of the phase changing means
according to the present invention, and FIG. Fig. 11 shows a block diagram showing changing
means to other phase 13 и и и Fig. 11 shows the same frequency characteristic and phase
characteristic chart and Fig. 14 shows still another phase changing means FIG. 15 is a phase
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characteristic diagram, and FIGS. 16 and 17 are schematic configuration diagrams showing a
conventional sound reproducing apparatus.
10 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и playback equipment, и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и playback equipment, 13 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ... 16 ...... woofer
speaker, 16 ? river phase change means, 17 ? rear tray, 18 18 box speaker, 19 ? ? ? ?
center console. Name of agent Attorney Nakao Toshio and other 1 person Figure 1/2
Reproduction 6 instruments Figure 2 Introduction to lesson 1 lesson 5 figure 6 figure 7 figure 8
Q figure 9 figure 11 Fig.12 Fig.13 Fig.14 1715 Fig. 160 Fig.17 Procedure correction document
(Procedure 9 September 1986
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