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JPH06113399

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DESCRIPTION JPH06113399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker arrangement method of a sound field reproduction apparatus for reproducing a feeling
of expansion perceived in any sound field.
[0002]
2. Description of the Related Art Heretofore, as described in Japanese Patent Laid-Open No. 3268699, a sound field reproducing apparatus of this type has been proposed in which an
impulse response measured by a dummy head microphone in a sound field is time-series
binaurally After compressing information using a correlation function, it is configured to perform
a convolution operation with an audio signal source, amplify and then reproduce with a plurality
of speakers.
[0003]
Such a conventional sound field reproduction apparatus will be described in more detail with
reference to FIG.
1 is a sound field to be reproduced. An impulse generator 2 is connected to the amplifier 3. 4 is a
speaker that emits an impulse. Reference numeral 5 is a dummy head microphone, which picks
up an impulse response at positions corresponding to the left ear and the right ear. A time-series
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interaural cross-correlation function measuring instrument 6 calculates a time-series inter-aural
cross-correlation function from impulse responses at the left and right microphones of the
dummy head microphone 5. 7 is an arbitrary space, where the sound field is reproduced. An
audio signal source 8 is connected to the convolution calculator 9. An amplifier 10 is connected
to the plurality of speakers 11. 12 is a listener.
[0004]
Next, the operation of the above conventional example will be described. In FIG. 5, after the
impulse generated by the impulse generator 2 in the sound field 1 to be reproduced is amplified
by the amplifier 3, it is emitted by the speaker 4 installed at the sound source position, and the
dummy head microphone 5 installed at the listening position The impulse responses at positions
corresponding to the left and right ears are measured and output to the time series inter-aural
cross correlation function measuring instrument 6. The time series interaural cross correlation
function measuring instrument 6 divides the impulse response at the position corresponding to
the left and right ears by the time window, and calculates the time series interaural cross
correlation function in each section, and the time series The time τ at which the interaural
cross-correlation function is maximum is determined, and the azimuth angle な る at which τ
and the interaural time difference are equal is determined. Next, from the impulse responses at
positions corresponding to the left and right ears of the dummy head microphone 5, the time Δt
at which the sound pressure becomes maximum in each section is determined. Further, the
incident energy E in each section is determined.
[0005]
The information of each time delay Δt, energy E and azimuth angle 算出 calculated in this way is
input to the convolution calculator 9. The audio signal output from the audio signal source 8 is
subjected to a convolution operation in the convolution operation unit 9 and amplified by the
amplifier 10, and then amplified among the speakers 11 surrounding the listener 12 in an
arbitrary space 7. The time delay Δt and energy E are presented from the speaker 11 in the
subspace in which is included.
[0006]
As described above, even in the above-described conventional sound field reproducing apparatus,
the amount of the impulse response at positions corresponding to the left and right ears of the
dummy head microphone 5 is reduced by the information compression by the time-series
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binaural cross correlation function measuring instrument 6. The amount of information can
reproduce the impression of the sound field.
[0007]
However, in the above-mentioned conventional sound field reproducing apparatus, since the
installation tolerance of the speaker 11 used for reproduction is not clear, the installation range
of the speaker can not be determined, and the minimum source required is also required. The
number of speakers is unknown, and there is a problem that the arrangement becomes
redundant.
[0008]
The present invention solves such conventional problems, and an object of the present invention
is to provide a speaker arrangement method for determining the installation range of the speaker
in the reproduction of the sound field expansion feeling.
Another object of the present invention is to provide a speaker arrangement method for
determining the minimum number of speakers required to reproduce a sense of expansion and
the arrangement method thereof.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to
determine the installation range of a speaker based on a speaker installation allowable angle
chart obtained from a psychoacoustic experiment, In addition, in order to achieve other objects,
the number of speakers required for reproduction and the arrangement thereof are determined
based on the speaker arrangement chart.
[0010]
Therefore, according to the present invention, the sense of expansion perceived in the sound field
can be reproduced by determining the installation range of the speaker of the sound field
reproduction apparatus based on the predetermined speaker installation allowable angle chart.
Have.
[0011]
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Further, according to the present invention, by using the speaker arrangement chart, it is
possible to determine the minimum number of speakers and their arrangement required for
reproducing the feeling of expansion perceived in any sound field. .
[0012]
[First Embodiment] FIG. 1 is a graph showing a speaker installation allowable angle chart
according to a first embodiment of the present invention.
In FIG. 1, the horizontal axis indicates the incident azimuth angle of the incident sound of the
sound field to be reproduced, and the vertical axis indicates the installation allowable angle of the
speaker in the case of reproducing the incident sound.
The solid line shows the upper limit of the allowable installation angle, and the broken line shows
the lower limit, which indicates that if the speaker is installed in this range, the sense of
expansion is reproduced.
[0013]
FIG. 2 shows the temporal configuration of the stimulus used in the psychoacoustic experiment
for obtaining the speaker installation allowable angle chart.
The stimulus consists of direct and single reflections.
The delay time for the direct sound of a single reflection sound is 25 ms, and the relative sound
pressure level is -6 dB.
[0014]
FIG. 3 shows the spatial configuration of the stimulus used in the psychoacoustic experiment for
obtaining the speaker installation allowable angle chart. The direct sound is emitted from the
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speaker 14 disposed in front of the subject 13, and the single reflection sound is emitted from
the speaker 15 disposed in the direction of the azimuthal angle equidistant from the speaker 14.
By conducting psychoacoustic experiments while changing the azimuth angle 0∼ to 0 to 180 °,
the upper limit value and the lower limit value in the above-mentioned allowable speaker
installation angle chart were obtained.
[0015]
Next, the operation of the first embodiment will be described. The configuration of the sound
field reproduction apparatus itself to be used is the same as that shown in FIG. 5, and therefore
will be described with reference to FIG. 5 below. Incident sound measured by the dummy head
microphone 5 in the sound field 1 to be reproduced has its incident direction determined by the
time series interaural cross correlation function measuring instrument 6 and is reproduced from
the speaker 11. At this time, the speaker 11 is installed in the range shown by the abovementioned speaker installation allowable angle chart. For example, if the incident angle of the
sound field to be reproduced is incident at an incident azimuth angle of 30 °, the speaker for
reproducing the sound needs to be installed in the range of 24 to 37 °. When the speaker is
installed at 20 ° and reproduced, the feeling of expansion becomes smaller than that of the
sound field to be reproduced. Conversely, when it is set at 50 °, the feeling of expansion
becomes larger than that of the sound field to be reproduced .
[0016]
Therefore, the sense of spread can be reproduced by providing the map based on such a speaker
installation allowable angle chart to the adjustment control device in the sound field reproducing
apparatus described above to determine the installation permission range of the speaker.
[0017]
As described above, according to the first embodiment, it is possible to determine the installation
allowable range of the speaker according to the incident azimuth angle of the incident sound of
the sound field to be reproduced by using the speaker installation allowable angle chart. It has
the advantage of being able to reproduce the sense of expansion of the sound field to be
reproduced.
[0018]
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Second Embodiment FIG. 4 is a graph showing a speaker arrangement chart according to a
second embodiment of the present invention.
The horizontal axis indicates the azimuth of the 24 speakers installed, and the vertical axis
indicates the incident azimuth of the incident sound reproduced by the speaker.
○ indicates the upper limit value of the incident azimuth angle, and ● indicates the lower limit
value. By numerically simulating the speaker installation allowable angle chart, the upper limit
value and the lower limit value in the speaker arrangement chart were obtained.
[0019]
Next, the operation of the second embodiment will be described. The configuration of the sound
field reproduction apparatus itself to be used is the same as that shown in FIG. 5, and therefore
will be described with reference to FIG. 5 below. The minimum number of the speakers 11 to be
installed is 24 shown in FIG. 4, and the arrangement thereof is the azimuth angle shown by the
horizontal axis in FIG. Incident sound measured by the dummy head microphone 5 in the sound
field 1 to be reproduced has its incident direction determined by the time series interaural cross
correlation sensitivity number measuring instrument 6 and reproduced from the speaker 11. For
example, it is assumed that the incident sound of the sound field to be reproduced is incident at
an incident azimuth of 50 °. When the incident azimuth angle is 50 ° on the vertical axis of
FIG. 4, it is a speaker installed at 44 ° that reproduces this incident sound from the horizontal
axis.
[0020]
Therefore, the 24 speakers 11 required in the sound field reproducing apparatus described
above are arranged at the azimuth angle indicated by the horizontal axis of the speaker
arrangement chart, and the adjustment control apparatus is based on the vertical axis of such
speaker arrangement chart A sense of expansion can be reproduced by determining a speaker
that reproduces the incident sound by providing a map.
[0021]
As described above, according to the second embodiment, by using the speaker arrangement
chart, the minimum number of speakers necessary for reproducing the sense of expansion and
the speaker arrangement thereof are determined, and further, the sound field to be reproduced is
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A speaker for reproducing each incident sound can also be determined, and it has an advantage
of being able to reproduce the sense of expansion of the sound field to be reproduced.
[0022]
According to the present invention, as is apparent from the above embodiment, the installation
range of the speaker used in the sound field reproducing apparatus can be determined by using
the speaker installation allowable angle chart, and therefore the sense of expansion of the sound
field is reproduced It has the effect of being able to
[0023]
Further, according to the present invention, by using the speaker arrangement chart, it is
possible to determine the minimum number of speakers and their arrangement required for
reproducing the feeling of expansion perceived in any sound field. .
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