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TECHNICAL FIELD OF THE INVENTION The present invention relates to a HERDphone device
and is used for music appreciation and the like. [Technical Background of the Invention] Sounds
attached to the sounding body in the vicinity of the ear, or inserted into the ear and sound f:
Listening to the headphone device is a portable stereo cassette player, etc. Music appreciation
including a portable cassette player, translation hearing at an international conference Are widely
used to listen to various sounds. Most headphone devices of this type are binaural in order to
give a sense of stereo sound e and reduce mixing of external sound. In such a binaural Held
phone apparatus, a sound image is always localized at an intermediate position between both
ears. That is, as shown in FIG. 1 (a), when the sound volume / and d coming from both ears are
equal, the sound source is felt to be in the front direction as shown by arrow 3, but it is shown in
FIG. 1 (b) Even when the head direction is changed, the sound t1 entering both ears does not
change, so the sound source is felt to be in the front direction of the head regardless of the actual
sound source position “, and the relative localization with respect to human beings is can get.
[Problems of backrest technique] However, the conventional headphone device that produces a
constant orientation to such a head is not particularly problematic when the eyes are closed, but
the visual ability is not good when the sound source can be identified. Unnaturalness occurs
when using a sense of balance. That is, when the natural sound source is 1311 <in the case of the
moon, as shown in Fig. 2 (a), the front stations entering from both ears are equal as shown in Fig.
2 (a). When the head direction is changed, Fig. 2 (b) As shown, the volume l 'entering the left ear
closer to the sound source is greater than the volume λ' entering the right ear, and the sound
source direction 3 with respect to the entire body does not change, and absolute localization is
obtained. Such a localization can not be obtained with the Radphone device, and there is a
problem that an unnatural phenomenon occurs in which a whistling can be heard from a position
different from the visually recognized sound source position. SUMMARY OF THE INVENTION
The present invention has been made to solve the above-mentioned intermittent point, and it is
an object of the present invention to provide a headphone device in which the absolute sound
source position can be made constant even if the head direction is changed during wearing. To
aim. SUMMARY OF THE INVENTION In order to achieve the above object, according to the
present invention, in a headphone device having two sounding bodies attached respectively to
both ears, the relativeness of the reference sound source seen from the center between the one
sounding bodies. By the sound source direction detector which detects the direction and the
output of this sound source direction detector! The sound volume position is provided as a full
feature that the sound source position is absolutely constant even when the head direction is
advanced It can be heard in position, and natural localization such as natural music can be
obtained with the ear.
BRIEF DESCRIPTION OF THE DRAWINGS Some embodiments of the invention will now be
described in more detail with reference to the drawings. FIG. 3 is a block diagram showing the
construction of an embodiment of the headphone device according to the present invention, in
which two sounding bodies, 2 and 13 are attached to a support //, and a gyrocompass 4 'is It is
attached to the center of the support //. Also, amplifiers / S and / A for performing power
amplification for headphone driving to the left and right sound signals SM generated from the
sound source 17 such as a record grader are connected to the sounding bodies 12 and / 3,
Connected to the amplifiers / S and / 6 is a path / 8 for transmitting the direction signal Sok
output from the gyrocompass / lI. By setting this gyro compass to a certain direction at the
beginning of listening, it outputs a direction signal SD according to the amount of deviation when
the head deviates from this direction. It is possible to control the amplifier /, t, / A to reduce the
sound on the stern side, and obtain extremely natural localization so that the sound can be heard
from a certain position regardless of the direction the head is pointed it can. 28 is a block
diagram showing another embodiment of the present invention, in which a support 2 is provided
with λ sound generators, 28. -Together with the reference signal receiver J and the reference
signal St3 all over the reference signal St3 of the ultrasonic wave emitted from the reference
signal transmission 4 placed at the reference point which is the virtual sound source position,
together with 23. The reference signal received by this reference signal receiver S and Y 6 is a
regulator, 2? And an acoustic signal S generated at the sound source 30 and output as an “f1”
amount ratio signal Sv. The power amplifier amplifies the power, and it is man-made. The
configuration of such a headphone device is shown in FIG. According to this, the reference signal
date s generated from the reference signal transmission 4 is received by the reference signal
receiver 2.8 ', and is sent to the distance angle detection unit 27a to be received by the receiver
25. The angle of the transmitter 21 with respect to the pure 16f connection is detected, and the
sound volume ratio term calculation unit 27b measures the volume ratio on the left and right.
This distance h (, subtraction of the angle and volume ratio will be described in more detail with
reference to FIG. 6). Now, when the front of the head is directed to the reference signal
transmitter 2μ at the reference point, the distance between the center point O of the sensor and
the reference signal transmitter 2'l is 1 The distance between the receiver on the left and the
transmitter 25 when the head orientation is compared by θ is IL, the distance between the
receiver J on the right and the transmitter is IB, and the transmitter is transmitted from Koda. If
the time it takes for the pulse-modulated ultrasonic waves to reach both receivers 2 and 4 is TL
and TF +, respectively, the velocity of sound is m and 2.
Therefore, the volume ratio can be adjusted using the distance ratio between left and right as LL
/, = TL7TR, and 'I'1. However, when LL and IB are sufficiently large with respect to the distance
between the receiver and 26 and the volume ratio TL / TR is l, the volume ratio can be corrected
using an appropriate constant α, In that case, the volume ratio also determines the attenuation
ratio V (R) for the direction of the received sound based on the attenuation factor U (1) of the
sound in the air and the directivity of the receiver to determine a more accurate volume ratio. It
can be used as follows. Here, θ L · θ R can be obtained by using a triangle interval & rather
than TL − 'r R 1 ′ ′, and in particular, as shown in FIG. In this case, θL = θR. The left and
right sonoelectricity ratio signals IEV thus determined are input to the amplifiers 2g and 2q, and
the amplifiers 2g, 2? Since the sound signal SM from the sound source 30 is adjusted to be larger
at the side closer to the reference sound source and smaller at the side farther to the reference
sound source, the sound always comes from the reference sound source position visit even if the
direction of the arm is changed. You can get the same absolute localization as natural sound. In
the above embodiment, the left and right volume control is performed in the amplifier, but this
amplifier is used in another receiver 2. It may be an amplifier different from the sound source
device provided on the support 2 / other together with S 'and 2t, or may be an amplifier forming
a part of the sound source device. In the embodiment shown in FIG. 6 to FIG. 6, although the
position of the reference sound source evaluation is fixed, it can be moved. For example, as
shown in FIG. 7, when listening to the voice of simultaneous interpretation through the
headphone device で at an international conference etc., the reference syllable transmitter ψ / aJ! If you set it in / b1 and switch it according to the observation, the voice of the interpreter will
be heard from the position of the speaker. In FIG. 7, even though the interpreter J is in a different
position from the actual speaker A, it is possible to generate another attendee BH by selecting the
reference sound source transmitter F / a'iz. It is easy to identify the speaker by receiving an
immediate image as if A is speaking in a translated language. Also, the embodiment of FIG. G is
applied to a flight simulator for maneuvering training of an airplane, and is used for collision
avoidance training. According to this, since it is performed by receiving the reference left / right
of the model of the airplane equipped with the five reference sound source transmitters, the way
of hearing the sound matches the sense of sight and balance. In the above embodiments, pulsemodulated ultrasonic waves are used as the reference signal, but if the distance and position can
be easily measured, a radio wave source winding is used, and a receiver or the like with these
characteristics is used. Also, in the embodiment, no mention is made of the directivity of the
receiver, and any directivity such as omnidirectional, uni-directional, etc. can be used, but in
particular, it is possible to use unidirectionality only in the forward direction. In the case where a
large volume is generated, it is possible to use it as a small volume by changing the direction of
the head by 1 rcr. [Effects of the Invention] As described above According to the above, the
output of the sounding body is detected by the output of the tone direction detector that detects
the relative direction of the reference sound source with respect to the sounding body attached
to both ears. Volume to lower 'llj' Since doing your, natural localization wo such as hear with
their ears a natural sound regardless of the orientation of the head?
4することかできる。 In particular, this naturalness is fat when using both vision and balance in
full, for example, when dancing and playing all the music.
Brief description of the drawings
FIG. 7 is a view showing the localization of sound in the conventional Herd Phone device, FIG. 41
is a view showing the localization of sound in natural sound, and FIG. 3 is a block diagram
showing one embodiment of the present invention using a gyrocompass FIG. V is a block diagram
showing another embodiment of the present invention using ultrasonic waves, FIG. 5 is a block
diagram illustrating the east embodiment of FIG. V in further detail, FIG. 6 is a reference signal
The figure which shows the principle which detects the distance jiiIt direction of a transmitter
and a reference signal receiver, FIG. 7 and FIG. R are figures which show the other Example
which applied this invention.
/, 2.7 ', 2' · · · · · · · · · 2 / · 2 / ... support / / 2, 2/3,. 2.2, 23 · · · · · sounding body, 15. / 乙, + 2g. λ
9 · · · Amplifiers, 6. / 7. . 30 · · · · · · · · · · · · · · · · · · · · · · standard signal transmitter, Yu 3. Unit ...
reference-signal receiver, 27 · · · adjustment 1.27 a ... distance angle detection unit, 27b · · · · ·
sound group ratio calculation unit. 1 fishing agent agent 猪 股 第 first cause Figure 2 [Figure 5
Figure 3 7 Figure 6
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