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JPH03168000

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DESCRIPTION JPH03168000
[0001]
FIELD OF THE INVENTION The present invention relates to a dummy head microphone that can
perform pinaural sound collection under an environment of external vibration and noise input
such as a vehicle. PRIOR ART As a conventional dummy head microphone, for example, there is
one as shown in FIG. That is, the figure shows a right ear cross-sectional view of the dummy head
microphone 1, and the dummy head microphone is disposed at a position corresponding to the
ear of the dummy head body 2. In the figure, 3 is an auricle shaped or made of rubber or the like,
4 is an ear simulator simulating acoustic impedance, 5 is a preamplifier, and a microphone
cartridge 6 is attached to the tip. Problems to be Solved by the Invention However, such a
conventional dummy head microphone l is made for the purpose of recording and reproducing
the sound itself that the human being listens to by the ear, and is generally indoors. Because it is
used by being stationary, it has a structure that is susceptible to external low frequency vibration.
For this reason, for example, when used in an environment where low frequency vibration easily
intrudes from the outside, such as a car cabin of a car at the time of traveling, the dummy head
microphone l originally records and reproduces a sound heard by a real human ear. Despite the
purpose, the dummy head microphone 1 picks up low frequency vibration, and there is a
problem that it gets on the recorded sound as noise. The present invention has been made
focusing on such conventional problems, and the object of the present invention is to cut low
frequency vibration even when used in an environment susceptible to vibration such as an
automobile. It is an object of the present invention to provide a dummy head microphone capable
of performing recording. Means for Solving the Problems Therefore, the present invention relates
to a floating mechanism for absorbing vibration between a noise detection unit and a dummy
main body in a dummy head microphone used for recording sound for reproducing actual ear
hearing and the like. Provided. A means to detect the vibration transmitted to a dummy head to a
mata and a Tammy head microphone, and to a dummy. Among the sounds collected by the two
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microphones, a means for reducing the sound of a portion caused by the vibration detected by
the vibration detection means is provided. Action Simulates the human inner ear, cervical spine,
and spine to a dummy ? The floating mechanism provided on the ear, neck, and trunk of the
throat absorbs low frequency vibration transmitted to the microphone, and the sound caused by
the vibration Cut and record.
Further, the sound recorded by the dummy head microphone and the low frequency vibration
detected at acceleration big-up are input to the adaptive filter, and the detected low frequency
vibration is removed from the recorded sound by a predetermined amount and recorded.
EXAMPLES The present invention will be described below based on the drawings. FIG. 1 is a view
showing a first embodiment of the present invention. First, the configuration will be described. A
microphone main body 8 which is a noise detection unit is supported by the dummy head main
body 2. A floating mechanism 7 made of a vibration-proof rubber material is provided between
the microphone body 8 and the dummy head body 2 to absorb low frequency vibration from the
outside, and comprises a microphone cartridge 6, a preamplifier 5, etc. Transmission of vibration
to the microphone body 8 is prevented. The human auditory mechanism is good, and the
mechanism of the inner ear, the cervical spine, and the spine absorb the low frequency vibration
from the outside. If these dumping mechanisms were not present, we would not be able to ride
on cars and the like. The floating mechanism 7 made of the anti-vibration rubber material of the
present embodiment simulates the low frequency vibration mechanism of the inner ear, and the
low frequency vibration is the same as in the case where the Tammy head microphone 1 is
brought close to the human ear You can cut the recording. Further, since the installation location
of the floating mechanism 7 is close to the microphone body 8, an effective vibration damping
action can be expected. FIG. 2 shows a second embodiment of the present invention. In this
embodiment, a floating mechanism 12 made of anti-vibration rubber material is provided on the
neck 11 between the head 9 and the body 10 of the dummy head body 2, and the head 9 and the
body 10 have seven rolling mechanisms. It is connected by a bolt 13 and a nut 14 through 12. In
the figure, 15 is a rubber washer and 16 is a washer. By using the rubber washer 15, vibration is
not transmitted through the bolt 13 and the nut 14. This embodiment simulates an external low
frequency vibration absorbing mechanism in human cervical spine, and can prevent the
transmission of low frequency vibration to the dummy head microphone l, as in the case of actual
hearing. Low frequency vibration can be cut, and when applied to a vehicle, it is particularly
effective against vibration from both the seat cushion and the seat back. FIG. 3 shows a third
embodiment of the present invention. In this embodiment, the body portion 10 is divided into an
upper portion 17 and a lower portion 18, which are joined by a blowing mechanism 21
constituted of a rubber column material 19 and a plurality of air dampers 20.
The present embodiment simulates the spine of a human being, and in this embodiment also, the
transmission of low frequency vibration is prevented, and recording in which low frequency
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vibration is cut as in the case of actual hearing When applied to a vehicle, it is effective in all
directions against vibration from the seat cushion. The first to third embodiments described
above are provided with the floating mechanism 7.1.21 that simulates the human hearing
mechanism to prevent the transmission of the vibration to the microphone main body 8, and
these may be implemented as necessary. By selectively using one or more of the examples, it is
possible to effectively obtain recorded sounds close to real ear listening. 4 and 5 show a fourth
embodiment of the present invention. While this embodiment mechanically floats each of the
above-described embodiments, an adaptive filter is used to electrically eliminate the influence of
low frequency vibration. FIG. 4 shows a block diagram of this embodiment, and FIG. 5 shows the
dummy head microphone 1 part. A noise signal containing low frequency vibration is collected
by the microphone body 8 configured by the dummy amplifier 5 microphone amplifier 5
microphone, etc. of the dummy microphone 1, is amplified by the microphone amplifier 22, and
is supplied to the adaptive filter 23 as a brief signal. Is entered as On the other hand, the low
frequency vibration input to the dummy head 1 is detected by the acceleration pick-a knob 24
attached to the microphone body 8 or the ear simulator 4 as shown in FIG. 5 and amplified by
the charge amplifier 25. The adaptive filter 23 is input as a reference signal {circle over (1)}. A
noise signal from which low frequency vibration has been removed can be detected from the
primary signal and the reference signal by the adaptive filter 23, and a vehicle interior sound or
the like from which sound due to the low frequency vibration is cut can be obtained. . Reference
numeral 26 denotes a recording device such as DAT, which enables recording with the effects of
low frequency vibration cut. Although the figure shows only one channel for simplicity, it is
naturally possible to record multiple channels. According to this embodiment, an effect similar to
that of the above embodiment can be obtained, and further, since it is electrical processing, there
is an effect that it is not influenced by the frequency of low frequency vibration. Although the
floating mechanisms are provided on the ears, the neck and the body of the dummy head main
body in the above-described embodiment, it goes without saying that the floating mechanisms
can be provided on other portions. Since the present invention is configured as described above,
according to the present invention, even when used in an environment susceptible to external
vibration such as a vehicle, it is the same as when listening with an actual ear. You can record the
recording sound that cuts low frequency vibration.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a
sectional view showing a second embodiment of the present invention, and FIG. 3 is a partial
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sectional view showing the third embodiment of the present invention. FIG. 4 is a block diagram
showing a fourth embodiment of the present invention, FIG. 5 is a cross sectional view showing
the fourth embodiment of the present invention, and FIG. 6 is a cross sectional view showing a
conventional example.
1 иии Dummy head microphone, 2 и и и Tammy head, 3 и и и pinnacle, 4 и и и и и и Ear simulator, 5 и и и и и и
и и и и и и и и и и microphone cartridge, 7 и и и floating mechanism, 8 ... Microphone body, 9 ... head, 10
... body part, 11 ... neck part, 12 ... floating mechanism, 15 ... rubber washer, 17 ... upper body
part,. 18 и и и lower body, 19 и и и rubber column material, 20 и и и air damper, 21 и и и floating
mechanism, 22 и и и microphone amplifier, 23 и и и adaptive filter, 24 и и и Acceleration pickup, 25 ...
charge amplifier. ? Tammy to ? ? ? 7 ? ? ? ? ? ? ?}}}}}}} j book: jl :: ?? ? Rubber H
Take Yoro Flodin 7 ? 41: ? ? ? f Figure 1 + f: ii 4% 12: Pflt rubber extension ?; Figure
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