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JPH03159500

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DESCRIPTION JPH03159500
[0001]
FIELD OF THE INVENTION This invention relates to a method of three-dimensional sound
reproduction. SUMMARY OF THE INVENTION The present invention relates to a method of threedimensional sound reproduction, in which a plurality of speakers each having a variable delay
element and a variable volume adjuster, and a reflector, create a focus of sound waves in a sound
field. The stereo sound field is configured as a new virtual sound source. This makes it easy to
control the sense of distance of the sound image, which was conventionally difficult.
(Conventional art) There are the following methods as a conventional three-dimensional sound
reproduction method. The first conventional example is a method called stereophonic (twochannel stereo), and is a method of reproducing and listening to the sound field by using two
speakers for the sound of the two systems, and the second conventional example Binaural
(Tammy Head Recording), a method of reproducing the left and right two-system sound collected
using a dummy head using headphones, and the third conventional example is quadraphonic (4
channel This method is called stereo), and is a method of reproducing four systems of sound
using four or more speakers. The pond is not as general as the above three methods, but there
are also three-channel stereo methods and methods with more channels. SUMMARY OF THE
INVENTION The prior art has the following disadvantages. First, it is difficult to control the sense
of distance of the sound image, in particular, to present (perceive) the sound image in front of the
speaker. When the sound sources are close, the distance to the sound image can be said
relatively correctly. The reason is said that the state of diffraction by the head of the listener with
respect to the sound wave changes greatly depending on the sound source distance, which
causes a subtle difference in the interaural difference, which is added to the clue. Therefore, even
in the conventional stereo, it is considered that the sense of distance of the sound image can be
controlled by precisely controlling the sound pressure of the listener's binaural population.
However, this method is not practical because it requires control for each listener since the
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amount of control depends on the geometry of each listener's head and ears. The second
drawback is that it is difficult to achieve stable sound image localization independent of the
movement of the listener's head. In the conventional three-dimensional sound reproduction
method, the change in sound pressure generated in both ears when the listener moves the head
is different from that in the original sound field, so the sound image direction is unnaturally
dependent on the head direction . This is true regardless of Sbika playback and headphone
playback. Therefore, the object of the present invention is to realize the above-mentioned
"control of the distance between sound images" and "sound image localization independent of the
direction of the head of the listener" which are difficult in the conventional method by a relatively
simple method. It is an object of the present invention to provide a three-dimensional sound
reproduction method.
[Means for Solving the Problems] That is, the three-dimensional stereophonic sound reproducing
method according to the present invention for achieving this object comprises a plurality of spins
each having a variable delay element and a variable volume controller. Are arranged on the same
curved surface or on the same plane, and the same audio signal is supplied to the plurality of
speakers, and the amount of delay of each of the variable delay elements and the volume of each
of the volume adjusters in each Or adjust both to create one or more focal points of sound waves
emitted by a plurality of the speakers, and move it to make the focal point a new virtual sound
grandson. It is characterized in that a stereo sound field is configured. (Operation) According to
the method of the present invention, instead of controlling the sound pressure of the population
of both ears of the conventional listener to produce a three-dimensional effect, a new virtual
sound source is created, thereby making the sound source Since a spherical wave is formed at
the center, the sound field itself is partially reproduced, so that even if the listener does not move
even if the head is slightly moved, a stable sound image localization is obtained as well as a
natural feeling A sense of three-dimensional sound reproduction is obtained, and the listening
position is enlarged. The method of the present invention will be described in detail by way of
examples with reference to the accompanying drawings. First, a first embodiment according to
the method of the present invention is shown in FIG. In this case, it is a skier regeneration device
which drives by supplying the same signal 2 to a large number of skier groups 1 arranged in a
spherical shape. At the center 3 of the spherical surface of this device, the phases of the sound
waves from the loudspeakers of the Sveker group 1 coincide, and there is a place where the
sound pressure is extremely high like the focal point of the light. Thus, a spherical wavefront
centered on the center 3 of the sphere is formed on the opposite side 4 of the skiker. When the
listener places the head in this, a diffraction effect similar to that when the real sound source is
placed at the center 3 of the sphere occurs, so that the sound seems to be aurally out of the
center 3 as well. That is, the virtual sound source is generated at the center 3 of the sphere. The
wavefront by this virtual source is different from the combined wavefront in stereo, and is similar
in structure to the wavefront by a real source. Therefore, even if the listener moves the head a
little, the direction of the sound image does not change. If variable delay elements are used for
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these speakers, it is not necessary to arrange the speakers spherically. A second embodiment
using a variable delay element is shown in FIG. This embodiment includes a Sveker group 5
arranged on a plane, a delay element group 6 connected to each Sveker, and a control unit 7 for
controlling the delay amount. In this embodiment, the amount of delay is adjusted so that the
phases of the sound waves from the speakers become equal at the desired position 8 of the
sound field.
In this way the sound pressure at point 8 is increased and a spherical wavefront is formed
therefrom. A plurality of virtual sound sources can be produced by combining a plurality of the
second embodiment. Although the delay element is included in the reproduction play in the
second embodiment, it may be included in the sound collection side. Furthermore, also in the
embodiment I, it is possible to attach variable delay elements and variable volume adjusters to
each of the sneakers and control them by the control unit to control the delay amount and
volume of each speaker to create a plurality of sound wave focal points. It is also possible to
move their focus, i.e. to make a plurality of moving sound images. Next, FIG. 3 shows a third
embodiment of the present invention which can control the sense of distance of a sound image
without using a delay element. This embodiment is a speaker reproducing apparatus which
supplies the same signal 10 to the speakers 15 to 23 arranged on the same spherical surface as
the embodiment 1 through the volume adjuster 11. If the magnitudes of the signals supplied to
the respective thrust forces are equal, the conditions are exactly the same as in Example 1, and a
virtual sound source is generated at the center 14 of the spherical surface, and a sound image is
perceived at that location. しかしここで、スビーカ17. 18. 19. 20. When only the
signal 21 is supplied, the width of the sound source becomes narrower as compared with the
condition for driving all the skiers, and the focus of the sound wave formed at the center 14 of
the spherical surface becomes somewhat incomplete. The center of the wave front, which is
shaped on the opposite side of the focal point, is also slightly farther to the speaker side, and is
around the middle l3 of the speaker 19 and the spherical center 14. Next, when a signal is
supplied only to the sub-card I9, a sound image is perceived at the location of the speaker I9 as a
matter of course. In this way, it is possible to control the sense of distance of the sound image by
controlling the number of speakers driven without using the delay element. Although the above
three embodiments have been described, the present invention is not limited thereto, and various
modifications and changes can be made without departing from the scope of the present
invention. (Effects of the Invention) The effects obtained by the method of the present invention
are as follows. First, the sound image can be presented in front of the speaker. In the
conventional method, when the listener's head is moved to control only the sound pressure at the
entrance of both ears, the effect is lost and unstable. According to the present invention, since a
spherical wave centered on a virtual sound source is formed, the listener may move the head
somewhat, and stable localization can be obtained. For the same reason as the first advantage,
the second advantage is to present a sound image that does not move even if the listener moves
the head. The third advantage is that the reproduction device can be made thinner.
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In the conventional reproduction method, since one sound image is composed of two skier
outputs, it is necessary to widen the speaker alone in order to achieve high sound quality, and
the enlargement of the device can not be avoided. According to the method of the present
invention, since the area of one speaker can be reduced, the speaker force alone can be small.
Therefore, the device can be thinned.
[0002]
Brief description of the drawings
[0003]
1, 2 and 3 relate to the method according to the invention.
The second and third embodiments are shown respectively. DESCRIPTION OF SYMBOLS 1 ...
Sbicaker group 2 ... input signal 3 ... center of a spherical surface 4 ... shape of a spherical wave
or an area 5 ... speaker group 6 ... variable delay element group 7 ... delay Amount control unit 8
... point of sound field 9 ... human power signal 10 ... human power signal 11 ... volume controller
12 ... gain control signal l3 ... mid point 14 of spherical center of Sveker 19 ... the center of the
spherical surface 15 to 23 ... speaker 1 Figure 1 moi 1 π 兇 2 figure
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