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JPH02119499

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DESCRIPTION JPH02119499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
headphone device. SUMMARY OF THE INVENTION In the present invention, a sounding body is
attached to a side wall of an acoustic tube, one end of which is in close contact with the ear canal
and the other end of which is an open end and having an inner diameter substantially equal to
that of the ear canal. In the headphone device, the microphone unit is attached to the side wall of
the acoustic tube, and the output signal of the microphone unit is supplied to the sounding body
through the noise removal circuit, so that the S / N ratio is not deteriorated by external noise. It is
made to be able to hear the sound of [Background Art] When monitoring the playback sound
with headphones, even though the true sound source of the playback sound being monitored is
outside, the monitor sound source seems to be confused as if it is in the head . That is, in the
conventional headphone, the monitor sound is localized in the head. This is because, in the
conventional headphones, the entrance of the ear canal is blocked, and a standing wave is
generated by reflection between the tympanic membrane and the headphones. Therefore, sound
waves are input through an acoustic tube whose one end is open, and matching of the impedance
between the ear canal and the acoustic tube is performed to prevent the generation of standing
waves and to localize the monitor sound out of the head. The inventors of the present invention
have proposed such headphones. That is, in such a headphone, a long acoustic pipe having
substantially the same diameter as the ear canal is provided, and a monitor sound is input
through the acoustic pipe. One end of the acoustic tube is in close contact with the entrance to
the ear canal, and the other end of the acoustic tube is opened. As the sound tube is of
approximately the same diameter as the ear canal, the impedance matching between the sound
tube and the ear canal can be made. And since the acoustic tube is long (stretched, and the other
end of the acoustic tube is open, standing waves due to the reflection of the tympanic membrane
do not occur. Therefore, when such headphones are used, the monitor sound is localized outside
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the head. Such headphones do not get tired because they monitor sound outside the head.
However, in such headphones, one end of the sound tube is in close contact with the entrance of
the ear canal in order to match the impedance of the sound tube and the ear canal. For this
reason, when such headphones are worn, almost no sound from the outside can be heard. If there
is almost no sound from the outside in this way, it is dangerous, for example, when walking while
wearing headphones. Therefore, it is conceivable to attach a microphone to headphones so that
external sounds can be heard.
However, if external sounds are heard, if there are external noise sources such as air
conditioners, engines and motors, these noises will be picked up by the microphone, and external
noises can be heard along with the monitor sound. Come. Such noise is very annoying. Therefore,
an object of the present invention is to provide a headphone device which can hear a necessary
sound from the outside as well as a monitor sound and can remove noise from the outside.
[Means for Solving the Problems] In the present invention, one end is in close contact with the
ear canal, the other end is an open end, and the sound is generated on the side wall of the
acoustic tube 2R12L having an inner diameter substantially equal to that of the ear canal. In the
headphone device to which the body 3R13L is attached, the microphone unit 4R14L is attached
to the side wall of the acoustic tube 2R12L, and the output signal of the microphone unit 4R14L
is supplied to the sound producing body 3R13L through the noise removal circuit 13R113L.
[Functions] The microphone units 4R and 4L are attached to the outer circumferences near the
ends 5R and 5L of the acoustic tubes 2R and 2L. For this reason, the sound of the outside world
can be picked up at the same position as listening with the ear. The signals picked up by the
microphone units 4R and 4 are respectively passed through the adaptive filters 13R and 13L,
mixed with the audio signals from the input terminal 11R and the input terminal 11L, and
supplied to the driver units 3R and 3L, respectively. Be done. Thereby, it is possible to hear the
sound from the outside simultaneously with the audio signals from the input terminal 11R and
the input terminal 11L. Since the signals picked up by the microphone units 4R and 4L are
passed through the adaptive filters 13R and 13L, these noises can not be heard even if there are
sources of noise such as air conditioning, motors and engines outside. An embodiment of the
present invention will be described below with reference to the drawings. FIG. 1 is an
embodiment of the present invention. In FIG. 1, the headphone 1 is composed of two acoustic
tubes 2R and 2L, driver units 3R and 3L attached to the acoustic tubes 2R and 2L, and
microphone units 4R and 4L. The acoustic tubes 2R and 2L have an inner diameter substantially
equal to the diameter of the ear canal 15. As the sound tubes 2R and 2L, it is desirable to use
those having sound insulation. The acoustic tubes 2R and 2L are juxtaposed to one another and
are bent corresponding to the shape of the head.
In this way, the acoustic tubes 2R and 2L can be lengthened. Adapters 6R and 6L are attached to
the respective ends 5R and 5L of the acoustic tubes 2R and 2L, respectively. The other ends 7R
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and 7L of the acoustic tubes 2R and 2L are open. Each of the acoustic tubes 2R and 2L may be
curved in a spiral. Driver units 3R and 3L are attached near the ends 5R and 5L of the acoustic
tubes 2R and 2L as shown in FIG. That is, a hole 8 is bored near the ends 5R and 5L of the
acoustic tubes 2R and 2L, and the driver unit 3R (3L) is attached to the hole 8. Further, as shown
in FIG. 2, microphone units 4R and 4L are attached to outer peripheral side walls in the vicinity
of the ends 5R and 5L of the acoustic tubes 2R and 2L. This headphone 1 is used by fitting the
adapters 6R and 6L to the inlet 16 of the ear canal 15, as shown in FIG. Thus, when the
headphone 1 is worn, the microphone units 4R and 4L are located at the ear. Therefore, in the
microphone units 4R and 4L, the external sound can be picked up at the same position as that
heard by the ear. As shown in FIG. 1, audio signals from the input terminal 11R for the right
audio signal and the input terminal 11L for the left audio signal are supplied to the mixers 12R
and 12L, respectively. Further, the outputs of the microphone units 4R and 4L are supplied to the
mixers 12R and 12L via the adaptive filters 13R and 13L. The adaptive filters 13R and 13L are
configured to estimate time series data so as to minimize the least square error by a linear
system, and remove periodic noise with high correlation. The adaptive filters 13R and 13L
remove external noise components generated periodically, such as noise from air conditioning
and noise from motors, engines and the like. In the mixers 12R and 12L, the audio signals from
the input terminal 11R and the input terminal 11L are mixed with the output signals of the
microphone units 4R and 4L via the adaptive filters 13R and 13L. The outputs of the mixers 12R
and 12L are respectively supplied to driver units 1-3R and 3L via the drivers 14R and 14L,
respectively. In this way, the audio signals from the input terminal 11R and the input terminal
11L are mixed with the signals picked up by the microphone units 4R and 4 and the mixed
signals are supplied to the driver units 3R and 3L.
For this reason, the sound from the outside can be heard simultaneously with the audio signal
from the input terminal 11R and the input terminal lIL. Signals from the microphones 4R and 4L
are passed through adaptive filters 13R and 13L to remove highly correlated noise. For this
reason, even if there are noise sources from the air conditioning, motor, engine, etc. in the
outside world, such noise from the outside world can not be heard. As shown in FIG. 2, since the
inner diameters of the acoustic tubes 2R and 2L are approximately equal to the inner diameter of
the ear canal 15, the impedance matching between the sound tubes 2R and 2L and the ear canal
15 is achieved. And since the other ends of the acoustic tubes 2R and 2L are open, a standing
wave is not generated by the sound wave reflected by the tympanic membrane 17. For this
reason, if this headphone 1 is used, it will be out-of-head localization. And, since the microphone
units 4R and 4L are located at the base of the ear, the sound of the outside world can be picked
up at the same position as that heard by the ear. Therefore, you can hear the sound of the
outside world just as you are directly at your ear. By the way, in one embodiment of the present
invention, matching of the impedances of the acoustic tubes 2R and 2L and the ear canal 15 is
taken, and the adapters 6R and 6L are fitted to the inlet 16 of the ear canal 15. Therefore, almost
no sound leaks from the connection point between the sound tubes 2R and 2L and the inlet 16 of
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the ear canal 15. On the other hand, the microphone units 4R and 4L are attached to the outer
circumferences of the acoustic tubes 2R and 2L, and the acoustic tubes 2R and 2L are formed of
members having good sound insulation. Therefore, even if the positions of the microphone units
4R and 4L and the driver units 3R and 3L are close, howling does not occur. Furthermore,
adaptive filters 13R and 13L are also effective for preventing howling. According to the present
invention, noise components with strong correlation in the signals picked up by the microphone
units 4R and 4 are removed by the adaptive filters 13R and 13L. Then, the external sound from
which noise has been removed through the adaptive filters 13R and 13L and the audio signals
from the input terminal 11R and the input terminal 11L are mixed and supplied to the driver
units 3R and 3L. Thereby, it is possible to hear the sound from the outside simultaneously with
the audio signals from the input terminal 11R and the input terminal 11L. The signals picked up
by the microphone units 4R and 4L are passed through the adaptive filters 13R and 13L, so the
signal-to-noise ratio does not deteriorate even if there are external air conditioning and noise
sources such as motor engines.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a crosssectional view used to explain the embodiment of the present invention.
FIG. 3 is a perspective view used to explain one embodiment of the present invention.
Explanation of main symbols in the drawings 1: Headphones, 2R, 2L: Acoustic tubes.
3R,3Lニドライバーユニツト。 4R,4L:マイクロホンユニット。 13R, 13L: Adjuvant
filter agent Attorney Sugiura Ura Hiroshi Chi SR + SL) Illustration Fig. 2 First prize 猥 Jl Fig. 1 Fig.
3
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