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JPS63263899

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DESCRIPTION JPS63263899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
input device of a sound field control device that performs realistic sound reproduction. 2.
Description of the Related Art In recent years, sound reproduction with a sense of reality is
desired, and devices C and the like that can obtain a surround effect are hereinafter referred to as
surround processors. Has been developed, and also digital surround processors have been
developed. As a method of inputting characteristics to the surround processor, most of them are
a preset method of storing characteristics in advance, or a method of inputting reverberation
time, initial reflection sound, delay time and the like with a key. Hereinafter, the above-described
conventional input device will be described with reference to the drawings. FIG. 5 shows the
structure of a conventional input device. In FIG. 5, 13 is an input oyster 114 for selecting a sound
field to be reproduced, a determination means for determining the contents from the input oyster
13, and 16 is a data storage unit 16 storing characteristic data according to the determination
means 14 The control unit is a control unit that reads characteristic data and sets the data in the
calculation unit 17. FIG. 5 is a flowchart showing an input procedure. The operation of the input
device configured as described above will be described below. First, when the condition is
selected from the input card 13 (step 21), the content of the input condition (such as what
acoustic characteristic is specified) is determined by the determination means 14 (step 22). In
accordance with the determined input condition, the control means 16 sets the calculation unit
17 for realizing the sound field characteristic data selected (step 23) from the storage unit 16
(step 24). By the above operation, it is possible to realize the selected sound field. Problems to be
Solved by the Invention However, in the above configuration, if it is desired to realize a sound
field other than the one prepared in advance, it is necessary to separately input a shallow echo
time, an initial reflection sound structure, a delay time, etc. In addition, the operation became
complicated 0, and there was a disadvantage that the sound field desired by the listener was
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simple (C: fast realization is difficult. In view of the above problems, the present invention
actually measures the internal impulse response using a shape model that represents the image
of the listener's reproduction bath as a shape, and sets this in the sound field control device as an
input characteristic. By doing this, it is possible to provide an input device of a sound field
control device which can easily and easily realize a sound field of any shape drawn by a listener.
Means for Solving the Problems In order to achieve the above object, the input device of the
present invention comprises a reduced shape model for realizing the shape of a reproduction
station, a transmitter for generating a signal for measuring an impulse response, and a sound. A
signal processing unit based on data from the A / D converter, an A / D converter for converting
a measured signal into a digital signal, and an ultrasonic wave regenerator for reproducing a
sound, a microphone for measuring a reflected sound, and An arithmetic unit that extracts data
that is a feature of the initial reflection sound and a data transfer unit that transfers the extracted
data to the sound field correction device are provided.
Operation The present invention measures the impulse response of the reduced shape model of
the reproduction space produced by the above-mentioned configuration using an ultrasonic
regenerator and uses it as input data to obtain a sound field of a shape that the listener imagines.
It is possible to realize easily and precisely. EXAMPLES Examples of the present invention will be
described with reference to the drawings. FIG. 1 shows a block diagram of an input device of a
sound field regenerator according to a first embodiment of the present invention. In FIG. 1, 1 is a
reduced shape model for realizing a rough three-dimensional or planar shape of a reproduction
space, 2 is a transmitter for generating an ultrasonic wave for impulse measurement, 3 is an
amplifier, and 4 is an ultrasonic wave for reproducing ultrasonic waves. A vibrator 6, a
microphone 6 for receiving an ultrasonic wave, an amplifier 6 for amplifying the measurement
signal, an A / D converter 7 for converting the measurement signal to digital, and a signal
processing 8 for the digital signal for initial reflection sound And a data transfer unit 9 for
transferring the data to a sound field control apparatus 1o for realizing an arbitrary sound field.
The operation of the input device configured as described above will be described below. First,
the three-dimensional or plane shape of the reproduction space which the listener wants to hear
is produced by the reduced shape model 1, and the ultrasonic transducer 4 and the micro are
respectively set at the speaker position and the listening position in it. Next, an impulse for
impulse response measurement is generated from the oscillator 2 and reproduced from the
ultrasonic transducer 4. The reproduced impulse response is measured by the microphone 5,
amplified by the amplifier 6 to an appropriate size, and then converted into a digital signal by the
A / D converter 7. FIG. 2 shows the impulse response measured by the above method. The
arithmetic unit 8 extracts an initial reflection sound, an attenuation coefficient, etc., which is a
feature based on the digital signal, and transfers it to the sound field control device 1 o by the
data transfer unit 9. There are many methods of extracting feature data in the operation unit 8,
such as a method of differentiating the measured impulse response to obtain a reflected sound to
be a feature or connecting peak values of the impulse response to obtain an attenuation curve faf
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. According to the above method, it is possible to easily and visually and quickly listen to the
reproduction sound field at the shape, the speaker position and the listening position desired by
the listener. FIG. 3 shows an input device of a sound field regenerator according to a second
embodiment of the present invention. In FIG. 3, reference numeral 11 denotes a discharge
control unit, and 12 denotes a discharge electrode. The operation of the input device configured
as described above will be described below. First, the discharge control unit 11.
A high voltage is applied to the discharge electrode 12 to cause pulse discharge. The pulses
generated by the discharge are omnidirectional and have relatively flat frequency characteristics.
The impulse response is determined in the same manner as in the first embodiment. By the above
method, it is possible to obtain an omnidirectional sound source with a wide frequency band, and
to obtain a more accurate impulse response. The first one of the present invention. In the second
embodiment, although one ultrasonic transducer 4 and one discharge electrode 12 for the sound
source are used, the same effect can be obtained by using a plurality of ultrasonic transducers 4
and discharge electrodes 12. FIG. 4 shows the directivity of the microphone 5 of the input device
of the sound field regenerator according to the third embodiment of the present invention. The
configuration is the same as in the first and second embodiments. The operation of the input
device configured as described above will be described below. First, an impulse is generated from
the ultrasonic transducer 4 and measured by the microphone 5, and loading is performed in the
same manner as in the first embodiment. Next, the micro is rotated by an angle according to the
directivity, and measurement is performed in the same manner as described above. By repeating
the above-described operation, it is possible to transfer to the sound field control device 10 data
that is characteristic of the sound coming from each direction at the listening position. It is
possible to capture even the spatial information of the reflected sound by the above method, and
it is possible to reproduce more faithful to the real sound field. As described above, the present
invention produces a reduced model of the shape desired by the listener, measures its innocuous
response using ultrasound, converts it into a digital signal, and transfers it to a sound field
regenerator. With this configuration, the sound field at any position of any shape can be realized
easily and precisely.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an input device of a sound field control apparatus according to a first
embodiment of the present invention, FIG. 2 is an impulse response characteristic measured by
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the input device of the same sound field control apparatus, and FIG. FIG. 4 is a block diagram of
the input device of the sound field control device of the second embodiment of the present
invention, FIG. 4 is a directional characteristic diagram of the microphone of the input device of
the sound field control device of the third embodiment of the present invention, FIG. FIG. 6 is a
flow chart of a conventional input device.
1 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии A / D converter, 8 иии и и
и и и и и и и и и и и и и и и и и и и data transfer unit, 11 и и и и и и и и discharge control unit, 12 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 и и и и и и и и и и и и и и и и и и и и и и и discharge control unit, 12 и и и и и и и и и и и и и и
и и и и и и и discharge electrode Name of Agent Attorney Nakao Toshio and 1 other person) ? h Fig.
1 = FL ? ?)
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