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JPS4937522

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DESCRIPTION JPS4937522
■ Multi-dimensional 3D sound reproduction system O Japanese Patent Application No. 4598266 [phase] Application No. 45 (1970) November 10 O same as applicant Applicant @
Wakushi Kurana 3 7 proxy attorneys Shi Yu Asagi 3 outsiders 2 people
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a known pinaural
sound pickup / listening system used as a basis of the present invention. FIG. 2 is a schematic
view showing an example of the sound collection and listening system in the present invention.
FIG. 3 is a schematic view showing another embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
reproducing acoustic conditions in music venues and other natural spaces almost at the same
acoustic conditions even in different places such as a general household room. Humans have ears
on both sides of their head, and sounds coming from an external source are out of phase,
acoustic spactrum differences and sound pressure due to the difference in distance between the
sound source and each ear and the head distortion effect. The difference is made into each ear 9
and it is possible to know the direction of the sound source, the distance of the large hole or the
acoustic condition of the sound field by the difference. According to this principle, theoretically,
in order to reproduce the acoustic state in the sound field A at another place B, the sound
entered into each ear when in the original sound field A is collected as it is, It is good to radiate
towards each ear at the same level as heard at the place under the condition which is not affected
by the acoustic condition of the place B. Fig. 1 shows a reproduction system using this principle,
in which 1 is a sound source for each musical instrument, and 2 is an artificial type used instead
of a head. 3 and 4 are nondirectional microphones for the left ear and the right ear respectively.
5 is the sound field of the music venue student. 6 is a place where any acoustic state like
[111111] may be in the listening room. 7, 8 are amplifiers etc. The numeral 9 indicates the head
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of the listener & the numerals 10 and 11 respectively indicate the earphones attached to the left
and right ears. That is, the small omnidirectional small microphones 3 and 4 are arranged at
places corresponding to the positions of the ears by using the artificial kind 2, and the sounds
collected by this are directly led to the earphones 10 and 11 (commonly called headphones) and
collected. It should be radiated to each ear equal to the sound pressure level at the time of sound.
This is a well-known pinaural listening system, as long as there is no defect in the equipment
used in this way! It is possible to notice at other places that the sound condition to be exposed to
the SIA is almost lost, but as a fatal defect of this pinaural system, from the direction when the
face is facing the front and back and up and down directions There is no sound source awareness
to. That is, sounds that must be recognized on the front are also aligned on a straight line passing
through both ears and can not be recognized on the front. The same is true for the back and up
and down. Using a special usage, it is possible to shift the line somewhat through both ears, but it
is not possible to obtain the perception in the original sound field or the state of hearing the
speaker ringing in front. On the other hand, in multi-dimensional three-dimensional sound of
about 4 channels using speakers, the sound collected by the microphone is limited to a small part
of the original sound field A, and the sound of the speaker emitting it is Because of the influence
of the acoustic conditions to arrive at each ear, those in A will be very different, and the fidelity
of sound field awareness will be much worse compared to pinaural.
The object of the present invention is to compensate for the impediment to the sound sources
other than left and right, which are the defects of the above-mentioned pinaural, and obtain a
three-dimensional sound listening perception with much higher fidelity than incomplete
multidimensional stereophonic sound in a few channels by speakers It is to try. FIG. 2 shows one
embodiment of the sound collecting and listening method according to the present invention, and
1 is a sound source of each musical instrument or the like. 2 is an artificial kind used for the
generation of the head. LM is left-ear microphone for binola [111111] EndPage: 1 RM, right-ear
microphone for FM, microphone for front-arrangement speaker arrangement, BM is microphone
for rear-arrangement speaker arrangement, 5 is music venue etc. Sound field. 6 is a listening
room. 9 is the head of the listener. 10 and 11 are acoustic radiation devices such as earphones or
speakers disposed close to the left ear and the right ear, respectively. 12 shows a situation where
the radiation sound from the BS is reflected to the back wall surface and the like to be
secondarily radiated into the room. Basically, the front speaker FS and the rear speaker BS are
disposed mainly for the pinaural shown in FIG. 1 so that sound images in the front and back
direction can be seen. As the earphone used, for example, one having a structure which can
freely reach the ear without damaging extraneous sound such as Japanese Patent Application No.
45-109235 (headphones) by the same applicant is used. Sound collection arranges
omnidirectional microphones on both sides of the artificial object 20 for the pinaural, LM for the
left ear, E for the right ear (M picks up with M and radiates voice to the left ear and the right ear,
respectively) obtain. The microphone Pe1f for front speaker placement is forward of the LM and
RM positions by the distance (usually several meters) from the listening position at home to the
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FS speaker as seen from the listening position, and the microphone BM for rear speaker
placement is a turn <L, The omnidirectional microphones are respectively arranged in M, RMJ
square meters, and the program sources to be provided to the front speaker FS and the rear
speaker BS are collected. The program source obtained in this manner and the corresponding
earphones and speakers are used to develop the sound image in the back and forth direction,
which is a drawback of pinaural, to obtain a listening sight with high sound field fidelity. Since
the sound emitted from both speakers is reflected and secondarily reflected to the wall surface
floor floor of the room, the sound emitted from the up and down direction (and the side
direction) is also generated, so the view from the up and down direction which is a disadvantage
of pinaural Some occurrence of the phenomenon also occurs, and approximately threedimensional stereophonic sound reappearance is established. This acoustic condition is
established not only with the above-mentioned microphone and speaker arrangement but also
with other arrangements, for example, as shown in FIG. 3, with some deterioration of fidelity.
Also, even when using a speaker placed close to each ear on the side of the earphone, an effect
similar to that can be obtained.
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