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2 Inventor 3 Patent applicant address Osaka Prefecture Kadoma city Ogata Kadoshin Address
1002 Name (582) Matsushita Electric Industrial Co., Ltd. Representative Matsu 'below' Shoji 4
agents 〒 517 Osaka Prefecture Kadoma city Oji Kadoma address 1006 ■ E1 national patent
Agency 0 JP-A-52-10701 [phase] Application dated application go, (197, 5) 7. / & Description 1,
title of the invention
Bai No, Ral recording and playback method
3. Detailed description of the invention · The present invention is a person with a human average
size cuboid and equipped with a microphone in the external ear] Nii Osamu Nibiru, at the time of
listening to pi rnot headphones with sound r · · · ' : Even when the acoustic energy density ratio of
indirect sound to W 晋 is not sufficiently obtained (eg, less than 0.1), it is possible to indirectly
generate the delay residual ° C signal of two different phases generated acoustically and
electrically. Recording / reproduction for obtaining a sufficient (e '+ 0.1 or more) acoustic energy
density ratio and localizing a sound image out of the head by combining sound as each sound
into the two-channel recording signal by the artificial type It relates to the method. Sounds heard
from the sound source in the room, which are emitted directly from the sound source, are only
direct ones (straight voices), and they are 'reflected' and indirect ones (indirect sounds). That is,
the sum of the energy of the sound emitted from the sound source can be said to be the sum of
the direct energy and the indirect sound energy. For example, a room with a reflective wall has
the property that indirect sound energy is hard to be absorbed by the wall and others, and that
the ratio of indirect to indirect sound EndPage: 1, -791% Nergi density is met . On the contrary,
the sound absorbing room has the property that indirect sound energy is absorbed and the sound
energy density of indirect sound to direct sound is small and the degree is small. FIG. 1 shows the
outline of the conventional recording and reproduction method. In the prior art, in the case of
stereo recording, in order to obtain a clear sound source, the sound w, 8 in the place of sound
absorption (dead), microphone 1 It is often performed close to 2 and, as multitrack recording
becomes widespread, the tendency is becoming remarkable. As a natural consequence, a sound
source recorded in stereo in this way has a feature that the ratio of acoustic energy to density of
direct sound in the sound collection field is small (for example, less than 0.01). In such a case,
there is a missing point that the * image is not localized outside the head when it is not heard
with the hecidphone 8 ". Therefore, in the case of the conventional stereophonic recording /
reproducing method "head-on hearing," the unnatural positioning of the head is made, which is
one factor that can not withstand long-term use. That is, it was considered that it was difficult to
realize localization outside the head in the headphone recording of the recorded sound source.
Fig. 2 shows the relationship between the acoustic energy density of indirect sound to direct
sound and the ratio of external localization in the case of pinaural recording and reproduction
through artificial animals (-Gu's house-head) by psycho-psychological experiment. It is a graph.
The acoustic energy density ratio of indirect sound to direct sound is 0. In other words, it is
difficult to localize the sound image outside the head in the absence of reflected sound. As the
acoustic energy density ratio of indirect sound to direct sound increases, the proportion of outof-head localization also increases, and when the acoustic energy density ratio of indirect sound
to direct sound is 0.1, the proportion of out-of-head localization is 6 o It becomes-. This indicates,
from the psychoacoustic point of view, that the acoustic energy density ratio of the indirect
sound to the direct sound is 0.1 as a detection limit (50%) of the out-of-head localization of the
sound image in the biographical recording reproduction. There is. Since a general cloud 60%
detection limit is considered as the limit of practicality, a sound image that can be practically
satisfied when performing pinaural recording reproduction using a dummy head with an acoustic
energy density ratio of indirect sound to direct sound of 0.1 or more. You can see the orientation
outside the head. However, due to the limitations of the scale, the acoustic energy density ratio
between direct sound and direct sound can not be sufficiently obtained 1 eg, acoustically, at any
point in the room, sound, energy density When there is an insufficient ratio, or when it is
necessary to place an artificial species V near or in close proximity to a sound source, etc., an
artificial sound recording signal or complement in the above sound field, or a dynamic sound
source Create two i delayed reverberation signals with different phases acoustically or
electrically from onma and ic recording signals by close microphones, and combine them as
indirect sounds, combining each of the 2-channel recording signals with the above artificial type
0ζ By mixing, it is possible to obtain a sufficient acoustic energy density ratio and to obtain an
out-of-head localization of a sound image. That is, the main object of the present invention is: (1)
recording with an artificial object having an average size head shape of a human, (2) using the
artificial head recording as a direct sound, these signals or other auxiliary microphone recordings
In the present invention, an indirect sound is produced from delayed reverberations of two
different phases created from the back of the signal, and the acoustic energy density ratio of the
indirect sound to be direct to S is 0.1 or more. An example is shown-in this example a delay! 11W
sound is obtained acoustically. In FIG. 8, B is a first sound recording field, S is a sound source
disposed in the sound recording field 6, point. 0 is direct sound energy density ratio of indirect
sound to sound is 0.1 or less. The sound from the sound w, S is recorded by the microphone 7 of
the artificial kind 6 installed at the point 0. Reference numeral 8 denotes a second sound field
which is sound-independent independently of the first recordings $ 8, and e is applied to the
speaker 9 through an amplifier 12 installed in the sound field 8.
The point σ is a point at which the sound energy density ratio is 0.1 or more and the echo
energy density ratio is 1 at 1 between jd and the direct sound from the speaker e. Or 6 emitted
sounds are recorded. This recorded signal is amplified through the microphone amplifier 14, and
this recorded signal is to be heard with the recording number 474 EndPage: 2 by the artificial
kind 1 and rich. As described above, in the present embodiment, in the second embodiment.
Acoustic energy of 0.1 or more by creating an acoustically different phase, delayed reverberation
signal, and mixing it as an indirect sound with the recording signal by the artificial head 1 The
density ratio is obtained, and the sound image is localized outside the head and head when
listening to the headphone 1B. FIG. 4 shows a second embodiment for obtaining delayed
reverberation by a method different from the embodiment shown in FIG. 3, and the difference
from the embodiment shown in FIG. In the first sound recording field 6, the microphone 1e is
installed in proximity to the sound source S in addition to the microphone 7 of the artificial head
6 and TI, and the recording signal is transmitted to the second sound field via the microphone
amplifier 17 and the power amplifier 18. Eighty speed '94 force is applied. In the present
embodiment, the distance l! Between the speaker 9 and the microphone, IS, 13 'in the second
sound field. In the first sound field 6, lld / 1 ° @ 5 shows the third embodiment of the present
invention, and in the present embodiment, it is obtained by combining the delayed reverberation
signal acoustically and electrically. It is. In FIG. 6, 19 is an acoustic energy density ratio Cali in
the second sound field 8, a microphone installed at one or more points σ, 20 is a time delay
device, 21 is a power amplifier, and 22 is a microphone 19 The phase shifter for dividing the
signal into two signals having different phases, and the output of the mixer 11 in Ssh or the
output of the microphone 16 in FIG. 4 is added to the time delay rL2 ° in FIG. A signal recorded
in monaural is divided into two signals of different phases through the phase shifter 22, and
these indirect sound signals are mixed with the artificial head recording signal in v13 and 934
and are heard by headphones. Addition! fj '61 may be used. As apparent from the above
embodiment, according to the present invention, even when the acoustic energy density ratio of
indirect sound to direct sound is 0.1 or less, sound images can be localized outside the head by
headphone listening. .
4, Brief description of the drawings 佑 1 Fig. 1 shows the outline of the conventional recording
and reproduction system Fig. 1 shows the acoustic energy density ratio of indirect sound to
direct sound in pinaural recording and reproduction, and the ratio of out-of-head localization
Figure showing! Fig. ls is a schematic view of an embodiment of a pinaural recording /
reproducing system according to an embodiment of the present invention, and Figs. 4 and 6 are
schematic views of another embodiment of the present invention. 5.8 · · · · · · · · · · · · · · · · · ·
artificial head, 7, 7 '. 13.1 S ', 19-· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Loudspeaker, 15 · · · · · · ·
·. Name of agent Attorney Nakao et al. 1 person Fig. 1 End Page: 3 Fig. J and 4 Fig. 5 "End page:
46 Inventions other than the above and agents Other than the above Address between Watanabe
address and address Address Watanabe Koko address Name address Kokko address address
Yamada Akitoshi Name Yamamoto Inukis Address same office EndPage: 5
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