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JP2003032799

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DESCRIPTION JP2003032799
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic system and a method of adjusting a sound field.
[0002]
2. Description of the Related Art Conventionally, a user who listens to a voice (musical music etc.)
with an audio system such as stereo equipment has properly arranged each speaker indoors to
form a good sound field. . Even so, in reality, due to restrictions such as the shape and the size of
the room, there is a certain place where there is a place where each speaker can be arranged, and
there are many cases where optimal acoustic setting is difficult. In addition, furniture and the like
are often arranged in places that can be obstacles indoors, and reflection of sound by such
furniture and the like has made acoustic setting more difficult.
[0003]
Recently, in order to form a good sound field, an acoustic system provided with an equalizer or
DPS (for processing sound by digital processing based on measured sound field data) and the like
is also commercially available. A user who uses such an acoustic system adjusts the sound field
by operating an equalizer or DSP. In addition, there is also an audio system having a function of
emphasizing bass in a simple manner, and the user has been able to adjust the volume and the
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like of the bass in the voice according to the preference.
[0004]
Problems to be Solved by the Invention The sound system provided with the above-mentioned
equalizer, DPS, etc. needs to adjust the sound field by the user's own manual operation, so it is
easy to make an appropriate sound field space. It was difficult to form. This is due to the fact that
the setting contents such as the equalizer and the DPS are a large number of combinations which
can be said to be infinite. Therefore, it is necessary for the user to repeatedly operate the
equalizer, DPS, etc., which is not only very complicated, but it is extremely difficult to search for a
favorite sound or a sound setting suitable for the room from among them.
[0005]
The present invention has been made in view of the above-mentioned circumstances, and relates
to an acoustic system and a sound field adjustment method capable of easily setting an
appropriate sound field.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, an acoustic system
according to a first aspect of the present invention is an acoustic system for adjusting a sound
field of an acoustic device, wherein any measurement position is provided. Transmitting means
for transmitting a wireless signal of a predetermined frequency, receiving means for receiving
the wireless signals transmitted from the transmitting means at a plurality of positions in the
audio device to be adjusted, and the receiving means at a plurality of positions The sound of the
audio equipment according to the coordinate specifying means for specifying the coordinates of
the measurement position at which the transmitting means is arranged according to the wireless
signal received and the setting data predetermined corresponding to the coordinates specified by
the coordinate specifying means And adjusting means for adjusting the field.
[0007]
In order to achieve the above object, an acoustic system according to a second aspect of the
present invention is an acoustic system for adjusting a sound field of an acoustic device having a
plurality of speakers, which is separated from a main body of the acoustic device by a
predetermined distance. Transmitting means for transmitting a radio signal toward the audio
equipment, receiving means for receiving the radio signals transmitted from the transmitting
means at a plurality of positions, and the receiving means receiving the signals at a plurality of
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positions Coordinate specifying means for specifying the coordinates of the measurement
position at which the transmitting means is arranged according to the wireless signal, storing
means for storing a plurality of setting data predetermined corresponding to the coordinates, and
the coordinate specifying means And acquisition means for acquiring setting data corresponding
to the coordinates, and control means for adjusting the sound field of the audio equipment in
accordance with the setting data acquired by the acquisition means. It is characterized in.
[0008]
In order to achieve the above object, an acoustic system according to a third aspect of the
present invention is an acoustic system for adjusting a sound field of an acoustic device having a
plurality of speakers, which is separated from a main body of the acoustic device by a
predetermined distance. Transmitting element for transmitting a wireless signal toward the audio
device, and a plurality of receiving elements for receiving the wireless signal transmitted from
the transmitting element, disposed in the vicinity of the audio device main body and each
speaker And a controller appropriately adjusting the sound field of the audio device, the
controller storing a plurality of setting data predetermined corresponding to the coordinates, and
the respective receiving elements at respective positions. Data acquisition which specifies the
coordinates of the measurement position where the transmission element is arranged according
to the received wireless signal, and acquires setting data corresponding to the specified
coordinates from the storage unit If, in accordance with the setting data to which the data
acquisition unit has acquired, and includes a control unit for controlling the audio equipment,
and characterized in that.
[0009]
In order to achieve the above object, a sound field adjustment method according to a fourth
aspect of the present invention is a sound field adjustment method for adjusting the sound field
of an audio device having a plurality of speakers, which comprises: A transmitting step of
transmitting a wireless signal from the transmitting element disposed at a measurement position
separated by a predetermined distance to the acoustic device, and the transmitting step by the
acoustic device main body and a plurality of receiving elements disposed in the vicinity of each
speaker In the receiving step of receiving the wireless signal transmitted in step b), the
coordinate specifying step of specifying the coordinates of the measurement position at which
the transmitting element is arranged according to the wireless signal received in the receiving
step; Obtaining the setting data corresponding to the specified coordinates from the storage unit
storing a plurality of setting data predetermined corresponding to the coordinates; According to
the setting data obtained in step, characterized in that it comprises a control step of adjusting a
sound field of acoustic equipment, the.
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[0010]
DETAILED DESCRIPTION OF THE INVENTION An acoustic system according to an embodiment of
the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 is a schematic view showing an example of the configuration of an acoustic system applied
to the embodiment of the present invention.
As illustrated, this acoustic system is configured to include wave receiving elements 1a to 1c as
receiving elements, a wave transmitting element 2 as a transmitting element, a cord 3, a stereo
device 4, and a controller 5. .
[0012]
The wave receiving elements 1a to 1c are made of, for example, a piezoelectric element capable
of converting an ultrasonic wave as a wireless signal into an electric signal, an acoustoelectric
effect element, etc., and receive the ultrasonic wave transmitted from the wave transmitting
element 2. Do.
As an example, as shown in FIG. 1, the wave receiving element 1 a is placed on the main body of
the stereo device 4, and the wave receiving elements 1 b and 1 c are placed on each speaker of
the stereo device 4.
The wave receiving elements 1a to 1c convert the ultrasonic waves received at the respective
positions into electric signals, and supply the converted electric signals to the controller 5
through the predetermined cables.
[0013]
The wave transmitting element 2 is made of, for example, a piezoelectric element capable of
converting an electric signal into an ultrasonic wave (sound wave of a predetermined wavelength
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and a predetermined frequency), an acoustoelectric element, etc., and is installed at an arbitrary
measurement position.
Specifically, as shown in FIG. 1, it is installed at the position of the user U (in the vicinity of the
user U's ear) listening to the sound emitted from the stereo device 4.
When receiving the electric signal supplied from the controller 5 through the cord 3, the wave
transmitting element 2 converts the received electric signal into an ultrasonic wave and emits it
toward the stereo device 4.
That is, the wave transmitting element 2 is controlled by the controller 5 to generate an
ultrasonic wave at the measurement position, and transmit the generated ultrasonic wave toward
the wave receiving elements 1a to 1c.
[0014]
The cord 3 is a cable for connecting the controller 5 and the transmission element 2 and
transmits the electric signal from the controller 5 to the transmission element 2. A
predetermined reference point is set on the cord 3 at a specified distance from the wave
transmitting element 2 in the state where the cord 3 is extended on a straight line. The code 3 is
fixed to the main body of the stereo device 4 at this reference point, and maintains a constant
distance between the wave transmitting element 2 and the main body of the stereo device 4.
[0015]
The stereo device 4 is, for example, an audio device consisting of a main body (amplifier, tuner,
CD player, etc.) and two speakers, and digitalizing the sound in the main body based on the
equalizer or DPS (measured sound field data) Processing etc.). Also, the stereo device 4 is
connected to the controller 5 via a predetermined cable, and performs any setting on the
equalizer or DSP in accordance with control data supplied from the controller 5. Specifically, the
stereo device 4 adjusts the equalizer and the like according to the control data to set the volume
of the left and right speakers, the delay of time, the volume of the high bass, and the like.
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[0016]
The controller 5 is, for example, a general-purpose notebook computer etc. provided with an
input unit (keyboard etc.), arithmetic processing unit (CPU etc.), storage unit (hard disk, memory
etc.) and display unit (liquid crystal display etc.) Become. The controller 5 controls the wave
receiving elements 1a to 1c, the wave transmitting element 2 and the stereo equipment 4
according to a program (a program such as a sound field adjustment process described later)
stored in advance in its own hard disk. In addition, the controller 5 stores, in its own hard disk, a
plurality of setting data for setting in the stereo device 4 (equalizer or DSP). Each setting data is
data defined in advance corresponding to a plurality of listening points (three-dimensional
coordinates) in the room. For example, each setting data is for adjusting the sound volume by the
value of the x coordinate, the balance adjustment of the sound volume of the left and right
speakers by the value of the y coordinate, the delay of sound, and the balance of the high sound
volume by the value of the z coordinate. It is data.
[0017]
Specifically, the controller 5 causes the wave transmitting element 2 to transmit an ultrasonic
wave, and the wave receiving element 1a to receive the ultrasonic wave. Then, the propagation
time difference between the direct wave and the reflected wave is determined using a cross
correlation method which does not depend on the sampling period or the wavelength, or the
cepstrum method which can obtain a time difference even when plural waveforms overlap. The
controller 5 calculates an accurate sound velocity by the following equation 1 based on the
obtained propagation time difference.
[0018]
## EQU1 ## V = r '/ sV: speed of sound r': distance s: time
[0019]
When the sound velocity is correctly calculated, the controller 5 causes the wave transmitting
element 2 to transmit the ultrasonic wave again, and the wave receiving elements 1a to 1c to
receive the ultrasonic wave respectively.
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Then, the controller 5 obtains three-dimensional coordinates of the transmission element 2 based
on the origin O as shown in FIG. That is, the controller 5 calculates the distance s between the
origin O (the middle point between the wave receiving element 1 b and the wave receiving
element 1 c) and the wave transmitting element 2 by the following Equation 2.
[0020]
## EQU2 ## s: distance between origin O and transmitting element 2 b: distance between
receiving element 1b and transmitting element 2 c: distance between receiving element 1c and
transmitting element 2 r: origin Distance on the y coordinate of O and the wave receiving
element 1b
[0021]
Then, the controller 5 calculates three-dimensional coordinates of the wave transmitting element
2 composed of the x coordinate, the y coordinate and the z coordinate according to the following
equation 3.
[0022]
## EQU3 ## s: distance a between origin O and transmitting element 2: distance b between
receiving element 1a and transmitting element 2: distance c between receiving element 1b and
transmitting element 2: receiving Distance r between wave element 1c and transmission element
2: distance on origin y and coordinate of receiving element 1b t: distance on origin y between
coordinate O and receiving element 1a
[0023]
After calculating the three-dimensional coordinates of the wave transmitting element 2
(measurement position), the controller 5 reads out the setting data corresponding to the
calculated three-dimensional coordinates from its own hard disk.
Then, control data according to the read setting data is generated and supplied to the stereo
device 4.
[0024]
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The sound field adjustment processing in the above-described acoustic system will be described
below with reference to FIG.
FIG. 3 is a flowchart for explaining the sound field adjustment process performed by the
controller 5.
The sound field adjustment process is started, for example, in response to an execution
instruction input from a keyboard or the like of the controller 5.
[0025]
First, the controller 5 causes the transmitting element 2 to transmit an ultrasonic wave (step
S11). That is, the controller 5 causes the wave transmitting element 2 to transmit an ultrasonic
wave by supplying an electrical signal to the wave transmitting element 2 via the code 3. The
controller 5 causes the wave receiving elements 1a to 1c to receive ultrasonic waves (step S12).
[0026]
The controller 5 determines whether the ultrasonic wave received by the wave receiving element
1a has an overlap between the direct wave and the reflected wave (step S13). When the
controller 5 determines that there is an overlap, it calculates the propagation time difference
using the cepstrum method (step S14). That is, the controller obtains the propagation time
difference between the direct wave and the reflected wave using the cepstrum method that can
obtain a time difference even when a plurality of waveforms overlap.
[0027]
On the other hand, when it is determined that there is no overlap, the controller 5 calculates the
propagation time difference using the cross correlation method (step S15). That is, the controller
5 obtains the propagation time difference between the direct wave and the reflected wave using
the cross correlation method which is not influenced by the sampling period or the wavelength.
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[0028]
The controller 5 calculates the distances from the wave transmitting element 2 to the respective
wave receiving elements (wave receiving elements 1a to 1c) using the calculated propagation
time difference (step S16). The controller 5 specifies three-dimensional coordinates of the
measurement position according to the calculated distances (step S17). That is, the controller 5
calculates three-dimensional coordinates of the wave transmitting element 2 (measurement
position) including the x coordinate, the y coordinate, and the z coordinate, using the abovedescribed Equation 3 and the like.
[0029]
The controller 5 sets the volume of the left and right speakers, the delay of time, the volume of
high bass, etc. in the stereo device 4 (step S18). That is, the controller 5 reads the setting data
corresponding to the three-dimensional coordinates of the measurement position from its own
hard disk. Then, the control data generated according to the read setting data is supplied to the
stereo device 4 to adjust the sound field of the stereo device 4.
[0030]
The controller 5 stores coordinate values (three-dimensional coordinates) and setting values
(setting data) in its own storage unit (step S19).
[0031]
As described above, ultrasonic waves are transmitted from the wave transmitting element 2
disposed at the measurement position separated by a predetermined distance from the main
body of the stereo device 4 by the sound field adjustment processing, and the main body of the
stereo device 4 and each speaker are It is received by three wave receiving elements 1a to 1c
arranged in the vicinity.
The controller 5 specifies the three-dimensional coordinates of the measurement position at
which the wave transmitting element 2 is arranged according to the ultrasonic waves received by
the wave receiving elements 1a to 1 c, and sets data corresponding to the specified three-
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dimensional coordinates from its own hard disk read out. Then, the controller 5 automatically
adjusts the sound field of the stereo device 4 by generating control data according to the read
setting data and controlling the stereo device 4.
[0032]
Therefore, the user does not have to set the equalizer or DSP of the stereo device 4 by himself.
Further, if the setting of the equalizer or the like by the controller 5 is used as a guide, fine
adjustment or the like by the operation of the user becomes easy. As a result, an appropriate
sound field can be easily set.
[0033]
Furthermore, since the controller 5 stores coordinate values (three-dimensional coordinates) and
setting values (setting data), only when the user selects an arbitrary value from them, the wave
receiving elements 1a-1c The sound field of the stereo device 4 can also be adjusted without
performing the measurement using the wave transmitting element 2 again. Also in this case, an
appropriate sound field can be easily set.
[0034]
Further, since the above-described acoustic system performs measurement using ultrasonic
waves, it is lower in cost than measurement by other methods such as laser and radio waves, and
construction of the system is also easy.
[0035]
In the above embodiment, the stereo device 4 having two speakers has been described as an
example, but the number of speakers is arbitrary, and by appropriately arranging the abovedescribed receiving elements, for example, 5 The present invention is also applicable to onechannel stereo device 4.
[0036]
In the above embodiment, although the three-dimensional coordinates of the measurement
position are specified using the ultrasonic wave as the wireless signal, this ultrasonic wave is
merely an example, and the present invention is not limited to this.
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[0037]
In the above embodiment, although the case of adjusting the sound field of the stereo device 4
has been described as an example, the present invention is also applicable to devices other than
the stereo device 4, for example, an audio system using a personal computer.
Furthermore, the present invention is not limited to the stereo device 4 and the like disposed in
the room, and can be applied to a car audio and the like disposed in the vehicle.
[0038]
As described above, according to the present invention, an appropriate sound field can be easily
set.
[0039]
Brief description of the drawings
[0040]
1 is a schematic view showing an example of the configuration of the acoustic system according
to the embodiment of the present invention.
[0041]
2 is a schematic diagram for explaining the three-dimensional coordinates of the transmission
element 2.
[0042]
3 is a flowchart for explaining the sound field adjustment processing according to the
embodiment of the present invention.
[0043]
Explanation of sign
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[0044]
1a to 1c Receiving element 2 Transmitting element 3 Code 4 Stereo equipment 5 Controller
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