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JPH0674000

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DESCRIPTION JPH0674000
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
compact audio device capable of rich bass reproduction and large-scaled stereo sound field
reproduction.
[0002]
2. Description of the Related Art Recently, the stereo reproduction method has been widely
adopted for products such as CD cassette players, mini component audio, karaoke, audio
multiplex television and the like, and the trend toward miniaturization of these devices is also
progressing.
[0003]
[0003] In these small devices, since it is difficult to take a large speaker distance between the left
and right speakers and it is also difficult to adopt a large aperture speaker unit, there is a
drawback that the sense of expansion of the stereo is poor and the bass reproduction capability
is inferior.
[0004]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a stereo device
having a reproduction sound field expanded beyond the distance between speakers and a rich
bass reproduction ability even in a small device.
08-05-2019
1
[0005]
SUMMARY OF THE INVENTION The audio device of the present invention converts left and right
stereo signals into a sum signal and a difference signal, and reproduces the sum signal from an
all-band speaker arranged at the center. The low signals are cut off as two signals in opposite
phase with each other and the difference signals are reproduced from the left and right middle
high frequency type speakers.
[0006]
[Operation] The sum signal speaker placed at the center is a full band type, but the difference
signal speaker placed at the left and right is a narrow band type that can only play middle to high
frequencies, so it is a compact speaker unit. Since it is good, it can be stored sufficiently even in a
small device.
[0007]
The low frequency range is reproduced only from one large-diameter speaker arranged at the
center, but the wavelength of the sound wave is long and the directivity is broad, and there is no
influence on the sense of direction of the stereo, and the sound spreading is felt. There is no
problem with
[0008]
The medium to high range contributing to the sense of direction of the stereo is formed by
enlarging the stereo formed by the radiation sound of the middle to high range of the center
speaker and the radiation of the small aperture medium to high speakers arranged on the left
and right. You can create a playback sound field.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to the drawings.
1 and 2 show an acoustic device according to an embodiment of the present invention, wherein
(a) is a front view (b) a sectional view showing a structure.
08-05-2019
2
[0010]
A full band type speaker unit 2 for reproducing a sum signal (L + R) obtained by adding the
stereo left and right signals L and R is attached to the center front of the acoustic box 1, and the
phases are opposite to each other after subtracting the stereo left and right signals L and R. The
small and medium speaker units 3 and 4 for middle and high frequencies that reproduce two
difference signals (L-R) and (R-L) are attached to the left and right.
[0011]
FIG. 3 is a diagram showing a circuit configuration for obtaining signals for driving the respective
speaker units of FIG.
The stereo left and right input signals L and R are branched respectively and added to the adder
circuit 12 to obtain a sum signal (L + R), and the subtraction circuits 11 and 13 respectively
subtracts the difference signals (LR) and (R -L) is obtained.
[0012]
The sum signal (L + R) is applied via the resistive attenuator 17 and the output amplifier 20 to
the centrally located full band loudspeaker unit 23.
[0013]
On the other hand, the two difference signals (L-R) and (R-L) are transmitted through the lowpass cutoff filters 14 and 15, the resistance attenuators 16 and 18, the output amplifiers 19 and
21, respectively. It is added to the high range speaker units 22 and 24.
[0014]
A sound field pattern shown in FIG. 5 is created by reproducing the sum / difference acoustic
signal thus arithmetically processed from each speaker and performing sound processing.
[0015]
FIG. 5 (a) shows a reproduced sound field pattern from a sound source by three speakers, and
FIG. 5 (b) shows the synthesized sound field pattern.
08-05-2019
3
Here, the solid line indicates the reproduction and synthesis sound field pattern in the middle
and high range, and the dotted line indicates the reproduction sound field pattern in the low
range.
[0016]
In general, the directivity pattern of the speaker is sharp in the high range and broad in the low
range due to the relationship between the size of the reproducing apparatus and the wavelength.
Therefore, as indicated by the dotted line, the directivity of the bass range by the central speaker
2 exhibits a broad pattern close to non-directionality, gives a sufficient bass feeling, and does not
affect the sense of stereo direction.
[0017]
On the other hand, in the middle and high tone range, the synthesis of the pattern by the center
speaker 2 and the left speaker 3 shown in (a) becomes (L + R) + (L−R) = 2 L, and the sound field
shown on the left of (b) Form.
Similarly, the synthesis of the pattern by the center speaker 2 and the right speaker 4 shown in
(a) is (L + R) + (R−L) = 2R, and the sound field shown on the right of (b) is
[0018]
FIG. 2 shows another embodiment of the present invention, and (a) is a front view (b) is a
sectional view showing a structure.
A full band type speaker 6 for reproducing a sum signal (L + R) is attached to the center front of
the acoustic box 5, and medium and high for reproducing difference signals (LR) and (RL) on the
left side and right side. Attach small area speakers 7 and 8.
08-05-2019
4
[0019]
Further, by attaching the openable and closable reflection plates 9 and 10 on the left and right
sides, the sound waves of the speakers 7 and 8 are reflected and emitted forward.
[0020]
FIG. 4 shows the construction of a simplified circuit for converting stereo left and right input
signals into speaker sum / difference output signals.
The left signal input L and right signal input R from the stereo amplifier output are added by
resistors 26 and 28 and added as a (L + R) signal to the full band speaker 29.
[0021]
On the other hand, the signals branched by the resistors 25 and 27 are passed through a lowpass cutoff filter composed of the capacitors 30 and 31 and the coil 32, and then the small and
medium-high loudspeakers 33 and 32 are connected in reverse phase with each other. By adding
to 34, the reproduction outputs of the difference signals (LR) and (RL) can be obtained.
This circuit is effective to realize the present invention easily at low cost.
[0022]
[Effects of the Invention] As described above, according to the present invention, it is possible to
realize stereo sound with rich bass and a sense of expansion even in a small device where it is
difficult to take a speaker interval sufficiently wide.
08-05-2019
5
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