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JPH0847081

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0847081
[0001]
[Industrial field of application] In the present invention, when listening to living sounds and the
like by headphone reproduction, it is made to feel as if there is a sound source around the
listener by devising recording and reproduction, and the surroundings of the listener are
virtualized. The present invention relates to a virtual reality sound recording / reproducing
apparatus adapted to be a real space.
[0002]
2. Description of the Related Art Conventionally, a speaker is used as a method of reproducing
sound, and when listening to music with a CD disc or the like, the speakers are arranged at the
left and right positions by stereo recording, and lateral spread is realized. A certain reproduction
can be performed, and the player's position can be easily imagined to provide a sense of reality.
[0003]
When listening to music watching in the middle of the night without time, you can not make a
loud sound outside, or if you want to listen personally or to increase the volume, instead of the
speaker Headphones are used.
In this case, in the above-described stereo recording, the position of the performer is arranged in
the left and right direction due to the strength of the left and right sounds, but various sounds
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can be heard in the head (referred to as in-head localization). Note that localization means, for
example, that when a person's voice appears on the screen in human conversation as if a human
voice comes out from the mouth of the person on the screen, it is said that the sound is localized
to the mouth of the person on the screen. The direction and position of the sound source are
determined and positioned.
[0004]
[0004] Thus, even if one listens to something with a three-dimensional effect (stereo recording)
with headphones, it is localized in the head. Therefore, by performing binaural recording, it
becomes possible to hear the sound from the position of the original sound source even in
headphone reproduction. The binaural recording is a concept of satisfying the condition to be
listened to by the human ear and recording, and when the recorded sound is reproduced and
listened by headphones, the direction and position of the sound source are localized out of the
head. In fact, as shown in FIG. 5, the sound that enters the ear is a combination of sounds that are
reflected or diffracted directly or through the head, pinna, shoulder and chest. Here, the path of
each sound is numbered 1 to 4 corresponding to the path reflected and diffracted by the head,
pinna, shoulder and chest. In fact, in extreme terms, there are different sounds with phase
differences, time differences, frequency characteristic differences compared to the originally
recognized sounds, such as head diffraction, shoulder reflections, back sound diffraction by the
pinnacle, etc. Go into the ear canal. This is where the sound comes from.
[0005]
As an example, if sounds that have passed through sound paths 1, 2, 3 and 4 are synthesized and
reproduced with headphones, it will be possible to perform out-of-head localization. Therefore,
the sound input from one microphone can be separately processed by arithmetic processing (a
plurality of signals having phase difference, time difference, and frequency characteristic
difference) to be reproduced as the sound heard by the ear. As shown in FIG. 6, the sound input
from one microphone is input to the arithmetic circuits 1a, 2a, 3a and 4a, and corresponds to the
paths 1, 2, 3 and 4 passing through the head, pinna, shoulder and chest, respectively. It is also
possible to create pseudo sound signals that can be heard and to put the synthesized signal of
these signals into the left and right ears.
[0006]
The distance between the sound sources is also recognized by the difference in the
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discrimination between the left and right ears, and a three-dimensional space can be imagined by
the localized positions of the various sound sources.
[0007]
By the way, in order to check the position of the sound source, the neck may be bent to turn the
face or body in the direction of the sound, but this is an operation that is meaningless at the time
of headphone reproduction. .
In this way, the sound may be received by the whole body, and in principle in the binaural
recording it should be possible to localize the sound source in all directions, but realistically, the
sound coming from the front will be localized in the head above the occipital region. And there is
a problem that it feels like the position of the sound source is in the
[0008]
For example, when the chandelier in the upper front falls to the floor, a passing sound in the fall,
for example, a rattling sound comes to be heard in the head as it approaches the front of the
listener, so the chandelier falls in the head. Cause an illusion of In addition, the impact sound that
the chandelier hits the floor is large, and just by reproducing the impact sound as a headphone,
the sense of weight of the bass is poor, and even if the volume is increased, only the eardrum
vibrates. Therefore, the localization in the front and the sense of reality are unsatisfactory and
the sense of reality is lacking.
[0009]
[0009] In order to improve such points, the present invention is an audio recording for virtual
reality that uses an open-air type headphone in which external sound can be heard to enhance
the three-dimensionality of the sound space and improve the sense of reality. -It aims at
providing a reproduction device.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is an
apparatus for recording between a binaural recording device and a position of a binaural
recording microphone and a front fixed position assumed to be a main sound source. Or
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equipped with a device that synthesizes an audio signal equivalent to the recorded sound, and
install a transducer on the floor or table etc. that generates the electric signal of the sound
together with the mechanical vibration by the magnetic interference from the coil and the yoke.
An open air type headphone having an installation position set apart from the installation
position of the transducer is provided, and two audio signals from the binaural recording device
are output by the open air type headphone, and the position and main of the binaural recording
microphone An audio signal considered to have been recorded between a sound source and an
assumed forward fixed position by the transducer And characterized in that force.
[0011]
In the above configuration, a second microphone is disposed between the position of the binaural
recording microphone and the front fixed position assumed to be the main sound source.
[0012]
Alternatively, an arithmetic processing circuit is provided, which receives an audio signal from a
binaural recording microphone and performs arithmetic processing so as to record the main
sound source in front of the microphone.
[0013]
Further, a second transducer is installed on a floor or a chair or the like corresponding to the
position where the open air type headphone is to be worn, and the second transducer causes the
two audio signals or the audio signals at the microphones to be installed. Is output.
[0014]
The present invention is configured as described above, and it is known that the microphone of
the binaural recording device is placed at the position of the ear of the human chest by acoustic
design (requires two microphones). However, one microphone is installed and arithmetic
processing of the reflection and diffraction sound of the chest, head, etc. is performed to create a
plurality of pseudo signals, and two synthesized signals combining these are made corresponding
to the left and right ears It may be
In addition, the audio signal of the same value as the audio signal recorded between the position
of the binaural recording microphone and the front fixed position assumed to be the main sound
source may simply be installed with the microphone at this position. You may produce by
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carrying out arithmetic processing of the audio | voice signal input with the microphone.
[0015]
[0015] In order to listen to what has been recorded, an open-air type headphone is worn facing
the installation position of the transducer and where external sounds can be heard.
This makes it easy to localize the sound source ahead by the sound heard from the open air type
headphones and the sound generated by the transducer, so that sound sources other than the
front sound source can also be heard from the left and right and front and rear directions. Will
be arranged in three dimensions.
Further, since the impact sound and the like are recognized together with the vibration, a heavy
feeling is given to easily recognize the magnitude of the impact.
[0016]
If a transducer is placed on the floor or chair, etc., the body directly senses the vibration, so it is
caught by the illusion of moving the body.
[0017]
Embodiments of the present invention will now be described with reference to the attached
drawings.
The table shown in FIG. 1 uses a table 5 and a chair 6, and can be equipped with an open air type
headphone 7 to listen to music or listen to a living sound field.
Transducers 8 are installed at key points of the table 5 and the chair 6.
Besides, the transducer 8 may be attached to the floor 9.
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[0018]
Transducer 8 will be described with reference to FIG. The external shape of the transducer 8 is a
combination of a case 10 and a thin plate 11 having a concave cross section, and the case 10 has
a plate-like damper 12 attached to the inner peripheral edge, and has an annular yoke 13, an
annular magnet 14 and a cross section. A convex yoke 15 is suspended. Further, a cylindrical coil
16 is fixed to the plate 11. An attachment hole 10a is provided at the end of the case 10.
[0019]
The coil 16 is inserted into an annular gap formed by the convex portion 15a of the yoke 15
inserted into the inner hole of the magnet 14, and is connected to the lead wire 17 extending
from the case 10.
[0020]
When a signal current flows through the coil 16 of the transducer 8, a magnetic field is
generated, and the yokes 13, 17 and the magnet 14 interfere with this magnetic field.
Therefore, for example, if the transducer 8 floats in the air, the case 10 side will be positionally
changed due to vibration centering on the side of the magnet 14 with large mass. In the relative
vibration, even when the case 10 is attached to the vibration receiving body, the amplitude shape
on the magnet 14 side is almost the same, so that the vibration following the signal current can
be generated efficiently. Further, as apparent from this configuration, the vibration plane of the
transducer 8 is not specified, but the vibration of the case 10 or the like can vibrate and generate
air.
[0021]
Next, in the present invention, normal stereo recording is not used, and recording is performed
by a binaural recording apparatus. First, when recording a sound from a sound source (also
referred to as a sound image as a thing), a second microphone is installed between the binaural
recording microphone and the front fixed position assumed to be the main sound source.
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[0022]
As an example, as shown in FIG. 3, the microphone 19 is installed at a position t1 away from the
sound image (chick) 18, and a dummy head 20 described later is installed at a position t2 away
from the microphone 19. Then, the sound recorded by the microphone 19 and the sound
recorded from the ears of the dummy head 20 are edited on the separate tracks of the storage
magnetic tape via the multi-transmitter 21.
[0023]
The dummy head 20 is intended to physically and faithfully capture the sound entering the
human ear, and the sound reflected / diffracted by the head, the pinna, the shoulder and the
chest position of the ear The microphone is placed at the position of the bust's ear so that it can
be recorded comprehensively. In the method without using the dummy head 20, as described in
the prior art, one input signal is subjected to signal processing assuming sound reflected and
diffracted by the head, pinna, shoulder and chest. The input signal is further processed more
realistically by arithmetic processing or added with deformation to create a signal (referred to as
processing). The sound recorded by the microphone 19 can also be processed to calculate the
time difference, phase difference, etc. of the sound recorded from the ear of the dummy head 20
to produce a recording signal of the same value.
[0024]
For reproduction of the processed signal, as shown in FIG. 4, the signal reproduced from the
storage magnetic tape is passed from the multi-transmitter 21 to the respective amplifiers 22 to
the open-air type headphone 7 and the transducer 8 below the table 5. input. This facilitates
localization of the sound in the vertical and longitudinal directions by the binaural effect of the
open air type headphone 7 and the sound generation of the transducer 8. In addition, the sense
of weight of the sound source can be easily estimated by the sound generation of the open air
type headphone 7 and the strength of the vibration of the transducer 8.
[0025]
When the sound reproducing apparatus of this type also records and reproduces various sound
sources in the surrounding area, it can be heard as if there is a sound source in that direction,
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while being placed in the surrounding area (outside the head The sound source is threedimensionally recognized, and furthermore, the sense of distance of the sound source in front is
imagined, the forward localization becomes easy, and the difference in weight due to vibration
can be recognized.
[0026]
Even in the case of the drop of the chandelier shown in the conventional example, it can be heard
as falling straight in front of the eyes, and the difficulty of the front localization can be
eliminated, so that a virtual space with fidelity can be provided.
In addition, since the sense of weight by vibration is also transmitted, the sense of realism comes
to be felt strongly.
[0027]
As another example, as shown in FIG. 1, it is assumed that a listener is sitting with the table 5 in
front of him. Then, when the tape recording the bark of the dog while the dog is riding on the
table 5 is reproduced by the open air type headphone 7 and the transducer 8 attached to the
table 5, the reproduced sound by the open air type headphone 7 and the transformer The
vibration and pronunciation of the juicer 8 make it possible to estimate which side of the front
the dog is as if the dog is riding on the table 5.
[0028]
Also, with respect to the listener, the forward localization of the dog makes it easy for the
vibration and pronunciation of the transducer 8 attached to the table 5 cooperating with the
open air type headphone 7 to estimate the distance to the dog, and the dog's call By the change
of the sound, it is possible to grasp the distance ahead and create a realistic virtual space.
[0029]
Furthermore, if the transducer 8 is not attached to the table 5, the dog's forward localization is
difficult, and even if it hears a cry or sound when the dog moves far, the cry or sound "from a
distance It sounds the same as "sounds heard," and the position of the dog is localized in the
head, but in the present invention, it is felt that a cry or sound comes from the front.
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[0030]
Further, in FIG. 1, when the vibration of the dog walking on the table 5 is transmitted from the
transducer 8, the presence of the dog on the table becomes strong, the size of the dog is also
estimated by the vibration, and the figure is small. Can make a rich virtual guess, such as a large
barking dog or a large but small barking dog.
[0031]
Besides this, by manipulating the input signal artificially, for example, the localization of the
sound as if the fish is moving above the listener is given, and when the sound of the bubble in the
sea is given, it is in the sea. Atmosphere is also obtained.
Also, if wind noise is added instead of the sound of bubbles in the water, the fish will be an image
of flying in the air, and it will be one scene of a science fiction movie.
[0032]
In addition, assuming that the listener is standing on the quay, if a ship in the bay approaches
while ringing a whistle, the situation in which the listener is facing in front of the listener is also
performed, and the sense of distance is clear The sense of urgency will also increase.
[0033]
Further, the image can be strengthened by vibrating the transducer 8 attached to the chair in
correspondence with the situation (virtual reality) of the listener, and it is also vibrated
independently. You can also set the situation that is placed.
In other words, it is possible to create a situation where "aboard a boat swinging on the flowing
water (the sound of waves, waves) and listening to the roar of a flying seagull (sound image
travels in the air) in the sky" Because the vibration on the boat is unique, you can experience the
instability floating on the water surface.
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[0034]
Since the present invention is a voice recording / reproducing apparatus for virtual reality
configured as described above, when the open air type headphone is used up to now, the
localization of the sound source in front is uncertain By placing the transducer in front, sound
generation and vibration are applied to compensate for the unlocalizable area in the front, so that
the positions of various sound sources can be reliably identified, and a more faithful virtual
reality Can create the world of
[0035]
Brief description of the drawings
[0036]
1 is a schematic diagram to which the voice recording / reproducing apparatus for virtual reality
of the embodiment according to the present invention is applied.
[0037]
2 is a cross-sectional view of a transducer used in the virtual reality voice recording /
reproducing apparatus shown in FIG.
[0038]
3 is a schematic diagram for explaining the recording of the voice used for the virtual reality
voice recording / reproducing apparatus shown in FIG.
[0039]
4 is a schematic diagram for explaining the reproduction of the voice used for the virtual reality
voice recording and reproducing apparatus shown in FIG.
[0040]
5 is a schematic diagram for explaining the conventional binaural recording.
[0041]
6 is a schematic diagram for explaining means for performing conventional binaural recording
by signal operation.
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[0042]
Explanation of sign
[0043]
5 table 7 open air type headphone 8 transducer 15 yoke 16 coil 19 microphone
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