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JPS5297501

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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
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DESCRIPTION JPS5297501
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
artificial head microphone, FIG. 2 is a frequency versus sound pressure characteristic diagram of
the same artificial head microphone, and FIG. 3 is a state in which a human is actually listening
The equivalent circuit diagram shown, FIG. 4 is an equivalent circuit diagram of □ in the case of
picking up sound with the artificial head microphone shown in FIG. 1 and listening with the
headphone, FIG. 5 is a cross sectional view of the artificial head microphone in one embodiment
of the present invention, FIG. 6 is a frequency-sound pressure characteristic diagram of the
artificial head microphone of the same, and FIG. 7 is an equivalent circuit diagram in the case of
picking up sound with the artificial head microphone of the present invention and listening with
headphones. 1 ... Pseudo head, 2, 2 '... Ear pin, 3, 3' ... Ear canal, 4, 4 '... Pseudo eardrum, 5.5' ...
Microphone.
DETAILED DESCRIPTION OF THE INVENTION The present invention is an lI-like head
microphone (dummy head) Kll capable of picking up the same sound as a sound heard and heard
by humans. Conventionally, in order to pick up the sounds and sounds heard by one person, a
bird rad to a dummy having a structure as shown in FIG. 1g1 is used. In FIG. 1, 1 is a simulated
head having an average size of a human figure of 2 and 2 and 2 'are simulated! The auricle on
the left and right of the 1111, the left and right auricles, 3.3 'is the external ear canal formed in
the artificial eyebrows 1, 4.4' has the same acoustic impedance as the human eardrum b, the
artificial eardrum, 5.8 'Is a microphone disposed at the back of the above-mentioned simulated
drum [414'. Collection 2 uses the conventional dummy head shown in FIG. 1 wA, arranges the
sound source in front of the flat surface of this dummy head, picks up the sound emitted from
this sound source with the dummy head, 6 'shows the frequency versus sound pressure
characteristics of the signal obtained. When sound is picked up by the conventional dummy head
shown in FIG. 1 as shown in FIG. 2, in the low / mid range, # 1 has a flat frequency-to-sound
pressure characteristic, but in the high region It is attenuated. For this reason, when the signal
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obtained by the microphone 6.6 / of the dummy head shown in FIG. 1 is reproduced by
headphones and heard, it can be heard differently from the case where actual IIK is heard at the
dummy head position. Due to this difference, the conventional soft head shown in FIG. Arranged
to pick up Ekrohon 6.6 / l, due to having. 3 In other words, the equivalent circuit when listening
to human beings or sounds is as shown in FIG. In Ji181mlc A 扛, signal source, B is the transfer
function of human's head by diffraction, C is the transfer function of auricle by diffraction, D is
the transfer function of external ear canal by resonance, E 框, acoustic impedance of tympanic
membrane is there. As described above, when a person listens to external music, it is influenced
by the diffraction of the head and pinna, collusion of the ear canal, and the acoustic impedance of
the tympanic membrane. On the other hand, in the case of reproducing the electric signal
obtained by the above-mentioned conventional die-head and obtained by the 71 crophone 6.6
'installed in this dummy head by the headphone of transfer function 1. The equivalent circuit is
illustrated as shown in FIG. In FIG. 4, A is a conventional sound source, B is a transfer of the
dummy head by the diffraction of the dummy head by the diffraction D 111 is a transfer function
of the dummy head by the diffraction D D is a transfer function of the external ear canal of the
dummy head by resonance. , E 'is the acoustic inbee-dance of the pseudo-tympanic membrane
4.4' of the Dud's head, the number of transmitting earpieces of the human ear canal by
resonance to D, IC is the acoustic impedance of the human tympanic membrane.
-Even if gaiil and IIE 41m are compared by t, even if 4B = B 'and C = C', sound is picked up by the
above-mentioned conventional dummy head, and when it is listened by headphones, vc, human
beings actually receive In comparison with the case, the transfer function D 'of the external ear
canal of the dummy head due to the resonance habit and the acoustic impedance E' of the pseudo
tympanic membrane of the dummy head are added. That is, in the case where a conventional
dummy hard is used to pick up sound and the headphone is listened to a hole #i, the transfer
function of the ear canal due to resonance and the acoustic impedance of the tympanic
membrane are affected redundantly. Significantly attenuates. The present invention eliminates
the above-mentioned conventional drawbacks, and the embodiments of the present invention will
be described below with reference to the IJXs drawing with the same reference numerals as in
the lllil drawing and the same part K. As is clear from FIG. 6, as in the present invention, in the
present invention, the microphone s 6't-similar drums @ 4, 4 'are not disposed at the back of the
entrance sK microphone 6 ° of the ear canal 3, 3'. -6 'is arranged. In the embodiment shown in
Fig. SeK, the wall 1iIK microphone four-phone 6.8 'is provided in the external ear canal 8, 3' b.
The frequency of the dummy head of the present invention shown in Fig. 6 W 'i Fig. 6 The sound
pressure characteristics are shown, and FIG. 7 shows the evaluation value 11.il path in the case
of reproduction with a head 0 phone of transfer function 1 using a waterfowl draft da (-head, and
FIG. 7 shows In FIG. 7, eight is a signal source, B 'is a transfer function C / a of the head of the
dummy head by diffraction, i1 a function of the pinnacle of the dummy head by diffraction, D is a
transfer function of the human ear canal by a part, E Is 10 in human eardrum impedance, 7P! As
apparent from the comparison between I and FIG. 3, −B-B ', C = C /, and if FIG. 7 and FIG. 3
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coincide, the dummy head of the present invention If it is blue and this is played back and
listened to with headphones, it is possible to pick up eight sounds actually. As apparent from the
above-described embodiments, the dummy head of the present invention has a human-made
dummy head, ear pinna and ear canal tube of average size, and has acoustic impedance equal to
P of human eardrum in the above-mentioned ear canal. h @ (a tympanic membrane t general), an
artificial ear, and a population IIK microphone of the above-mentioned ear canal are disposed,
and according to the present invention, a signal including up to a high range is collected as in
“1. It has the advantage of being able to sound and having a reduced S / N ratio (signal to noise
ratio) compared to conventional dummy heads.
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