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JPS5480703

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DESCRIPTION JPS5480703
Description 1 and title of the invention Dummy head recording and reproducing method Dummy
head microphone main body of the left microphone and right microphone sound collection
output signal disposed at both ears position, and disposed at the face position of the dummy
head microphone main body And the output signal passed through the delay circuit, high-pass
filter, and attenuator are mixed by the left mixing amplifier and the right mixing amplifier,
respectively, and are heard by the left and right headphones. A dummy head recording and
reproducing method characterized by having.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a dummy head recording
/ reproducing method capable of external sound localization of a front sound source and
realizing excellent presence. Various methods have been proposed to reproduce the rich realism
of the performance venue. This method is a dummy head recording / reproducing method in
which sound is collected by a microphone attached to the dummy binaural part and reproduced
and listened to this by headphones. FIG. 1 is a diagram showing the configuration of a
conventionally used dummy head recording / reproducing system. As shown, in the conventional
method, the left microphones 13. A method of collecting the sound source 11 using the right
microphone 14 and listening to this by the left headphone 17 and the right headphone 18 of the
headphone listener 19 through the recording / reproducing systems 15 and 16 respectively
corresponding to the left ear and the right ear Is adopted. With this conventional method, the left
and right or rear sound images can be localized outside the listener's head to obtain rich
presence, but the front sound image can not be localized and 7? How to stop the listener's head
or the back of the listener is inverted and localized. An abnormal phenomenon occurs. The
present invention solves the problems with this conventional method, enables localization outside
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the head of the front sound source, and provides a dummy head recording / reproducing method
with improved stability of the sound image. Hereinafter, the dummy head recording and
reproducing method according to the present invention will be described in detail based on the
embodiments thereof. The basic configuration of the dummy head recording and reproducing
system using the present invention is as follows: the output signals collected by the left and right
microphones attached to the left and right ears of the dummy head microphone body; The output
signal collected by an additional microphone for frontal front sound enhancement attached to
one face passes through a delay circuit with a variable delay time of 0 to 3 rnsgc, a high pass
filter with a cutoff frequency of a kHz, and an attenuator. This system uses the system of mixing
with the left and right mixing amplifiers and passing through the transmission characteristic
correction circuit and listening with the left and right headphones of the listener. First, the
directional characteristics of the human ear which is the basis of the dummy head recording and
reproducing method according to the present invention will be described. Fig. 2 shows the
directional characteristics of the human ear. (?), (A), (c) and (d) show the directional
characteristics corresponding to frequencies of 200 Hz, 2 kHz, 5 kHz and 8 kHz, respectively. It
is. In the figure, the broken line shows the characteristic of the right ear, and the dashed line
shows the characteristic of the left ear. In this figure, the directivity curves of the left ear and the
right ear are energetically superimposed. The characteristic curve shown by the solid line of
Although the mechanism has not been clarified yet, it is known that if the auditory loudness is
set, the energy sum of the amount of information from each of the left ear and the right ear is
heard. The characteristic curve shown by the solid line in FIG. 2 shows the characteristic that the
front is depressed as is apparent particularly when the frequency is 5 kHz and a kHz, and the
front sound image for this is compared with the sound image of the lateral or diagonal front.
Therefore, it is thought that an abnormal phenomenon is likely to occur that is likely to be
unclear and to be inverted and localized in the head or backward. When a person listens to the
sound directly at the performance venue, not only the sound information from the left and right
ears, but also the sound information coming from the face stimulates the sense of hearing as
bone transmission sound. Due to the psychological effect based on the psychological perception
that the forward sound source is confirmed and present in the sound field, the forward sound
source is also erroneous (it is a circular part to confirm. So, in the dummy head recording and
reproducing method used conventionally, the inside or the back of the head in which the sound
image in front is obscured in the rounding which the above-mentioned various information in
case a human listens to a sound directly lacks. FIG. 3 is a block diagram showing a configuration
of an embodiment of a dummy head recording and reproducing system using the present
invention. As is apparent from the figure, in the preferred embodiment of the present invention,
the sound from the sound source 31 is added to the left and right microphones 34 and 35
attached to the positions of the left and right ears of the dummy head microphone body 32.
Sound is collected at the attached additional microphone 3303. The output 4-force signals of the
left microphone 34 and the right microphone 35 are amplified by the amplifiers 310 and 311,
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respectively, and then given to the left mixing amplifier 312 and the right mixing amplifier 315
as inputs. On the other hand, the output signal of the additional microphone 33 is supplied to the
amplifier 36. Delay circuit 37. High pass filter 38. Via attenuator 39, it is provided as an input to
left mixing amplifier 312 and right mixing amplifier 313. After the respective superimposed
signals of the output signals of the left microphone 34 and the right microphone 35 and the
output signal of the additional midrophone 33 obtained in this manner are recorded by the
recorder 314, the left is used to flatten the transmission characteristics. The signal is supplied as
an input to the equalizer 315 and the right equalizer 316, passes through the left amplifier 317
and the right amplifier 31B, and passes through the left headphone 319 and the right headphone
320 of the headphone listener 321, and the listener left eardrum 322 and the listener The right
tympanic membrane 323 is stimulated to reproduce the sound.
FIG. 4 is a view showing a structure of a dummy head portion of a dummy head recording and
reproducing system using the present invention. EndPage: 2 dummy head parts, to the left and
right of the main body 41 which has taken the shape of a human head, an auricle 42. A cavity 43
and an ear canal 44 are formed. In this case, the length and diameter of the ear canal 44 adopt
25 crn and 7 as average values. At the end of the ear canal 44, a simulated acoustic impedance
circuit element 45 and a microphone 46 for simulating the acoustic characteristics of the human
eardrum are disposed. By attaching the simulated acoustic impedance circuit element 45, the
acoustic characteristics of the dummy head microphone can be made close to the characteristics
of the human ear, and faithful sound collection becomes possible. The material of the main body
41 also uses a silicone rubber that approximates the acoustic characteristics of human skin. A
front emphasis microphone 47 is disposed on the face portion of the main body 41 of the
dummy head portion. The directivity characteristics of the microphone 46 disposed at the
positions of the left ear and the right ear in the dummy head portion configured as described
above become substantially equal to the directivity characteristics of the human ear shown in
FIG. Further, the directivity characteristic of the additional microphone 330 has a distribution as
shown in FIG. In FIG. 5, dashed line. The dashed-dotted line, the dashed-dotted line, and the solid
line are directivity characteristics corresponding to frequencies of 200 Hz, 2 kHz, 5 'Hz and B
kHz, respectively. In the block diagram of the embodiment shown in FIG. 3, when the human
actually listens to the sound, the delay circuit 37 has 0 to 5 myec of sound information which is
incident from the face and which is necessary to stimulate hearing as bone transmission sound.
An analog delay circuit element having a variable delay time is used. As already shown in FIG. 2,
the directivity characteristic of the human ear has a main rope diagonally forward particularly in
a high frequency band of a kHz or more. On the other hand, in the directional characteristic of
the human ear, the energy sum of the amount of information from each of the left ear and the
right ear has a directional characteristic in which the front is depressed. In order to compensate
for this characteristic, the directivity characteristics of the additional microphone shown in FIG.
85 are superimposed. In this case, the frequency dependency of the directivity characteristics of
the human ear is taken into consideration 1, 7. A high pass filter 38 having a cutoff frequency of
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a kHz and a characteristic of, for example, 24 dJ10 ct is inserted as shown in FIG. FIG. 6 shows
an embodiment of the dummy head recording / reproducing system using the present invention
described above, and adjusting the attenuator 39 to the optimum state, the output signals of the
left microphone 34 and the right microphone 35 and the additional microphone 33. It shows the
directivity characteristics of the energy signal obtained by energy superposition.
The solid line in the figure shows the directivity characteristics when the output signal of the
additional microphone 33 is not superimposed in energy, and the one shown by the broken line
indicates the directivity when the output signal of the additional microphone 33 is superimposed
in energy It is a characteristic. FIG. 6 shows the directivity characteristics at a frequency of 5
kH2, clearly showing the effect when the output signal of the additional microphone is
energetically superimposed. As described above in detail, according to the dummy head
recording and reproducing method according to the present invention, it is possible to provide
the recording re-recording 8 which is capable of external localization of the front sound source
and realizes excellent presence.
4. Brief description of the drawings FIG. 1 is a diagram showing the configuration of a
conventionally used dummy head recording and reproducing system, FIG. 2 is a diagram showing
the directional characteristics of the human ear, and FIG. 3 is a diagram using the present
invention FIG. 4 is a block diagram showing the configuration of an embodiment of a dummy
head recording and reproducing system, FIG. 4 is a diagram showing the structure of a dummy
head portion of a dummy head recording and reproducing system using the present invention,
and FIG. FIG. 6 is a diagram showing the directivity characteristics of the superimposed signal of
the output signals of the left and right microphones and the additional microphone. The sign of
the Description 11 ............ sound source 12 ... - ........ dummy head microphone body 13 ............ left
the microphone 14, и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Right microphone 15.16 и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и left headphone 18 и и и и и и иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Dummy head microphone main body 33 и и и и и и и и и и и и и и и additional microphone! +4
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Amplifier 37 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Attenuator 312 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Sound recorder 315 ииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Headphones listener 322 ииииииииииииииииии Left
eyelid 323 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?и и и и и и и и и и и и и и и и и и и
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Simulated impedance circuit element 46 и и и и и ... the microphone 47 ............ forward emphasized
microphone attorney Attorney thin 1) Togikarashisai 1m for two prisoners (2) EndPage: 4-yearold two-necked (I)) the first 2m ( 2 mouths (d) o 3 mouths 1.3 '32435zJ / 17.3NJ 7 3 "de
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