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DESCRIPTION JP2006258442

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DESCRIPTION JP2006258442
The present invention provides a system capable of automatically detecting the position of a user
who is a viewer more easily. A speaker device 2 outputs a measurement audio signal from a
speaker SP, and starts measurement of time by a timer 23a. When the remote control 3 receives
the measurement audio signal by the microphone 32, the remote control 3 transmits a reception
command indicating that it has been received to the speaker device 2. When receiving the
reception command, the speaker device 2 stops the timer 23a. In this way, the measurement
audio signal is output from the two speakers SP separated from each other, the time until the
measurement audio signal reaches the remote control 3 is measured, and based on the two
measured times, the arithmetic unit 23c Calculates the position of the remote control 3. [Selected
figure] Figure 1
Position detection system, speaker system and user terminal device
[0001]
The present invention relates to a position detection system, and more particularly to a position
detection system for detecting the position of a user who is a listener in a speaker system
including a plurality of speakers.
[0002]
Conventionally, in a speaker system including a plurality of speakers, it is necessary to detect the
position of the user and form a sound image according to the position so as to obtain an
optimum sound field for the user who is the listener. It is
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In particular, in an array speaker system, by controlling the amount of delay added to the audio
signal input to each speaker, directivity is provided to the output audio, and the audio beam thus
formed is reflected by the wall surface It has come to be done to form a three-dimensional sound
field by doing. Therefore, the position detection of the user is also important for appropriately
setting the beam parameters.
[0003]
As a conventional position detection technique, for example, in a stereo sound restoration device
described in Patent Document 1, a viewer is provided with a tone generation device, and
receiving circuits are provided in the vicinity of left and right speakers, respectively. The position
of the viewer is detected from the reception level when the dial tone from the reception circuit is
received by the reception circuit. Further, Patent Document 2 discloses that a human's position is
detected using a plurality of dedicated human body sensors. Patent Document 3 discloses that
the position of a viewer is specified by processing an image taken by a video camera.
[0004]
JP 05-091597 JP 05-137200 JP 13-054200 JP
[0005]
However, the conventional position detection technology has the following problems in addition
to the necessity of installing dedicated receiving circuits, sensors, cameras and the like at
appropriate positions.
In the position detection technology described in Patent Document 1, it is necessary to provide a
speaker for outputting sound and a power amplifier for driving the sound in the sounding device
possessed by the listener. In addition, it is necessary to provide a sound receiving circuit on the
speaker side separately from the original speaker function. Thus, the beeper becomes bulky.
Further, in the position detection technology described in Patent Document 2, since a plurality of
human body sensors (infrared sensors) are used, the process of detecting the position of a person
becomes complicated, for example, when a plurality of persons are detected. . Further, according
to the technology described in Patent Document 3, a video camera and an image processing
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apparatus are required, and therefore the cost of both hardware and software increases.
Therefore, an object of the present invention is to provide a system capable of automatically
detecting the position of a user who is a viewer more easily.
[0006]
In order to achieve the above object, a position detection system according to the present
invention comprises a plurality of speakers including first and second spatially arranged
speakers, and driving means for driving these speakers, respectively. The user terminal device
comprises: a speaker system; a user terminal device having signal transmission means for
transmitting a wireless signal to the speaker system; and position detection means provided on
the speaker system side for detecting the position of the user terminal device. And a signal
transmitting means for transmitting a signal to the position detecting means when a voice signal
from one of the speakers is detected. The position detecting means includes a receiving means
for receiving the signal transmitted from the user terminal device. The time from when one of the
plurality of speakers is driven to when the signal from the user terminal device is received Time
measurement means for measuring the first speaker, a first time from receiving the first signal to
the audio signal from the first speaker, and driving the second speaker And calculating means for
calculating the position of the user terminal from the second time until the second signal is
received.
[0007]
On the user terminal side, an audio signal generated from the speaker is detected, and when the
audio signal is detected, the signal is transmitted to notify the speaker system to that effect.
On the speaker system side, the first and second time until voice signals respectively generated
from the first and second speakers reach the user terminal are respectively measured, and the
position of the user terminal is measured from these two times. Calculate
[0008]
Further, in the position detection system according to the present invention, the user terminal
device transmits an activation signal indicating that the position detection is to be started to the
speaker system, and the position detection means further includes an activation signal from the
user terminal device. May be provided with drive control means for driving the first speaker
when receiving the signal.
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[0009]
Further, the drive control means may drive the second speaker after receiving the first signal
from the user terminal device.
[0010]
The above speaker system may further include volume control means for controlling the balance
of the volume output from each of the speakers according to the position of the user terminal,
and in the case where the speaker system is an array speaker, the user A delay control unit may
be provided to control the amount of delay to be added to the audio signal input to the speaker
according to the position of the terminal device.
[0011]
The above speaker system may further include determination means for determining whether the
position of the user terminal device is appropriate and notification means for generating an audio
signal from the speaker based on the determination result of the determination means. Good.
The user terminal device may further include display means for performing display based on the
audio signal when the audio signal of the notification means is detected.
[0012]
According to the present invention, the position of the user who is the listener can be
automatically detected more easily without providing a dedicated receiving circuit or sensor for
position detection.
[0013]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
FIG. 1 is a block diagram showing the configuration of the speaker system according to the
present embodiment.
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The speaker system 1 shown in FIG. 1 includes a speaker device 2 in which a plurality of
speakers SP are arranged in a line in the horizontal direction, and a remote controller (remote
control) 3 for transmitting a control signal for controlling the operation of the speaker device 2.
Configured
[0014]
The speaker device 2 includes a receiving unit 21 that receives a control signal from the remote
control 3, a system controller 22 that controls each component of the speaker device 2 based on
the control signal received by the receiving unit 21, and The position detection unit 23 that
detects the position of the remote control 3 based on the instruction, the audio control unit 24
that introduces an audio signal to the speaker device 2, the position of the remote control 3
detected by the instruction of the system controller 22 and the position detection unit 23 And a
speaker control unit 25 that controls an amplifier 26 provided for each speaker SP based on the
above.
[0015]
The receiving unit 21 includes, for example, a known I / F device such as an infrared light
receiving device, receives a modulated infrared signal output from the remote controller 3 and
the like, and demodulates the received signal to a system controller Enter 22
[0016]
The system controller 22 is a functional unit that issues various instructions to the position
detection unit 23 and the speaker control unit 25 based on the control signal received by the
reception unit 21.
For example, when receiving a control signal instructing to increase or decrease the volume, the
system controller 22 causes the speaker control unit 25 to adjust the volume of the speaker SP.
Also, a control signal (hereinafter referred to as a “start command”) for requesting position
detection of the remote control 3.
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System controller 22 causes position detection unit 23 and speaker control unit 25 to perform a
position detection operation described later.
[0017]
The position detection unit 23 stores a timer 23a that measures time based on an instruction
from the system controller 22, stores the time measured by the timer 23a, and stores a program
that controls the operation of an arithmetic device such as a processor. It comprises a memory
23 b and an operation unit 23 c which calculates the position of the remote control 3 based on
the time stored in the memory 23 b. Arithmetic unit 23c realizes a predetermined function by
operating an arithmetic device such as a processor according to a program stored in memory
23b.
[0018]
The audio control unit 24 is a functional unit that inputs an audio signal input from a recording
medium such as a CD (Compact Disc) or an MD (Mini Disc) or an audio file such as an MP3 to the
speaker control unit 25.
[0019]
The speaker control unit 25 controls the amount of control of the amplifier 26 provided for each
speaker SP and the sound input to the amplifier 26 based on the instruction from the system
controller 22 and the position of the remote control 3 detected by the position detection unit 23.
It is a functional unit that adjusts the balance of the volume of the audio signal input from the
audio control unit 24 by controlling the delay amount of the signal, and outputs the audio signal
from the speaker SP.
Further, based on an instruction from the system controller 22, the speaker control unit 25
causes the predetermined speaker SP to output a measurement audio signal.
[0020]
On the other hand, the remote control 3 has an input unit 31 for detecting an operation input by
the user, a microphone 32 for detecting an audio signal, and a signal detection for detecting a
measurement audio signal output from the speaker device 2 from a sound receiving signal of the
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microphone 32 The remote control control unit 34 generates a control signal to be transmitted
to the speaker device 2 based on the information detected by the unit 33, the input unit 31 and
the signal detection unit 33, and is modulated by the control signal generated by the remote
control control unit 34 And a transmitter 35 for transmitting an infrared signal or the like.
[0021]
The input unit 31 includes a known user I / F device such as a button, a touch panel, a pointing
device, etc., and inputs information related to the detected user's operation input to the remote
control unit 34.
[0022]
The microphone 32 is configured by a known microphone, and inputs the detected sound
reception signal to the signal detection unit 33.
[0023]
The signal detection unit 33 detects the measurement audio signal output from the speaker
device 2 from the sound reception signal of the microphone 32, and inputs the measurement
audio signal to the remote control control unit 34.
[0024]
The remote control control unit 34 generates a control signal for the speaker device 2 based on
the information on the user's operation input detected by the input unit 31, and also acquires the
measurement audio signal from the signal detection unit 33 described above. A control signal
indicating that a signal has been received (hereinafter referred to as "reception command").
Generate).
Note that the signal detection unit 33 and the remote control control unit 34 can be integrally
configured by a device such as an LSI.
[0025]
The transmission unit 35 is formed of, for example, a known I / F device such as an infrared light
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emitting device, and outputs an infrared signal or the like based on the control signal generated
by the remote control control unit 34.
[0026]
Next, an operation at the time of detecting the position of the remote control by the speaker
system according to the present embodiment will be described with reference to FIGS.
FIG. 2 is a sequence diagram showing the operation of the speaker system, and FIG. 3 is a
schematic view showing the positional relationship between the speaker device 2 and the remote
control 3.
In the present embodiment, as shown in FIG. 3, an example in which twelve speakers SP1 to
SP12 are arranged in a line in the horizontal direction with a predetermined interval apart will be
described.
Here, in order to facilitate the description, the arrangement direction of the speakers SP is taken
as an X axis, and an axis orthogonal to the X axis and parallel to the horizontal direction is taken
as a Y axis. The X-axis has the right side toward the speaker device 2, that is, the speaker SP12
side as the positive direction, and the Y-axis has the output direction of the audio signal from the
speaker SP, that is, the user side as the positive direction. The intersection point of the X axis and
the Y axis, that is, the origin of the X axis and the Y axis is at the center of the speakers SP1 to
12, that is, the middle between the speaker SP6 and the speaker SP7.
[0027]
First, in the remote controller 3, for example, when the position detection start button is pressed,
the input unit 31 detects an operation input for requesting a position detection operation from
the user (step S201). A control signal (start command) instructing the start of the position
detection is generated and transmitted by the transmission unit 35 (step S202).
[0028]
When the reception unit 21 of the speaker device 2 receives this start command (step S203), the
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system controller 22 causes the timer 23a of the position detection unit 23 to start measuring
time, and the speaker control unit 25 causes the predetermined first. The first measurement
audio signal (hereinafter, referred to as “first measurement signal”) from the speaker SP (in
the present embodiment, the speaker SP1 located at one end of the speakers SP1 to 12 arranged
in a line) is referred to as “first measurement signal”.
) Is output (step S204). At this time, the speaker control unit 25 may output, from the speaker
SP1, a continuous audio signal which continues to output an audio signal until a stop instruction
is given as a measurement audio signal, but it is a single pulse audio signal. A single voice signal
may be output.
[0029]
When the signal detection unit 33 detects the first measurement signal output from the speaker
SP1 from the sound reception signal of the microphone 32 of the remote control 3 (step S205),
the remote control control unit 34 performs control indicating that the measurement audio
signal has been received. A signal (reception command) is generated and transmitted by the
transmission unit 35 (step S206).
[0030]
When the reception unit 21 of the speaker device 2 receives this reception command, the system
controller 22 causes the timer 23a of the position detection unit 23 to stop measuring time, and
the measured time, that is, the first measurement signal reaches the remote control 3 The
memory 23b temporarily stores the first time t1 required for the process (step S207).
When the measurement audio signal is the continuous audio signal, when the reception
command is received, the system controller 22 causes the speaker SP1 to stop the output of the
measurement audio signal. In the present embodiment, the time required for the generation of
the control signal in the remote control 3 and the transmission / reception of the control signal is
far smaller than the propagation time of the measurement audio signal, and is ignored.
[0031]
Next, the system controller 22 causes the timer 23a to start measuring the time again, and the
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second predetermined speaker SP (speaker arranged in a line in this embodiment) separated
from the speaker SP1 by the speaker control unit 25. The second measurement audio signal
(hereinafter, referred to as “second measurement signal”) from the speaker SP12) positioned
at one end of SP1 to SP12. ) Is output (step S208).
[0032]
When the signal detection unit 33 detects the second measurement signal output from the
speaker SP12 from the sound reception signal of the microphone 32 of the remote control 3
(step S209), the remote control control unit 34 performs control indicating that the
measurement audio signal has been received. A signal (reception command) is generated and
transmitted by the transmission unit 35 (step S210).
[0033]
When the reception unit 21 of the speaker device 2 receives this reception command, the system
controller 22 causes the timer 23a of the position detection unit 23 to stop measuring time, and
the measured time, that is, the second measurement signal reaches the remote control 3 The
memory 23b temporarily stores the second time t2 required for the process (step S211).
Here, when the measurement audio signal is the above-mentioned continuous audio signal, when
the reception command is received, the system controller 22 causes the speaker SP12 to stop the
output of the measurement audio signal.
[0034]
Next, the calculation unit 23c of the position detection unit 23 obtains the first time t1 and the
second time t2 stored in the memory 23b, and calculates the position of the remote control 3
based on these (step S212). This calculation method will be described with reference to FIG.
[0035]
When the first time t1 and the second time t2 are equal (t1 = t2), it means that the distance
between the remote control 3 and the speaker SP1 is equal to the distance between the remote
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control 3 and the speaker SP12. Therefore, it is understood that the remote control 3 is
positioned on the Y axis in FIG. 3, that is, on the center front of the speaker device 2 (the position
of the remote control 3a shown in FIG. 3). At this time, assuming that the coordinate of the X axis
of the speaker SP1 is x1 and the coordinate of the X axis of the speaker SP12 is x2, a distance y
between the remote control 3 and the speaker device 2 is a first time t1 or a second time t2.
From the sound speed c and the distance (x2-x1) between the speaker SP1 and the speaker SP12,
it can be calculated by the following equation (1).
[0036]
y=[(ct1)<2>−{(x2−x1)/2}<2>]<1/2>
=[(ct2)<2>−{(x2−x1)/2}<2>]<1/2>・・・(1)
[0037]
If the first time t1 'is longer than the second time t2' (t1 '> t2'), it means that the distance
between the remote control 3 and the speaker SP1 is longer than the distance between the
remote control 3 and the speaker SP12.
Therefore, it can be seen that the remote control 3 is located closer to the speaker SP12 than the
center of the speaker device 2, that is, the remote control 3 is located on the right side of the Y
axis (the position of the remote control 3b shown in FIG. 3) when FIG. At this time, the coordinate
x 'on the X axis of the remote controller 3 and the distance y' between the remote controller 3
and the speaker 2 can be calculated by the following equations (2) and (3).
[0038]
x’=[(ct2’)<2>−(ct1’)<2>+(x2)<2>−(x<1>)<2>]/[2(x2−x1)
] ・・・(2)
[0039]
y’=[(ct1’)<2>−(x2−x’)<2>]<1/2>
=[(ct2’)<2>−(x’−x1)<2>]<1/2>・・・(3)
[0040]
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If the first time t1 ′ ′ is shorter than the second time t2 ′ ′ (t1 ′ ′ <t2 ′ ′), it means that
the distance between the remote control 3 and the speaker SP1 is shorter than the distance
between the remote control 3 and the speaker SP12.
Therefore, it can be seen that the remote control 3 is located closer to the speaker SP1 than the
center of the speaker device 2, that is, the remote control 3 is located on the left side of the Y
axis (the position of the remote control 3c shown in FIG. 3).
At this time, the coordinate x ′ ′ on the X axis of the remote controller 3 and the distance y ′
′ between the remote controller 3 and the speaker 2 can be calculated by the following
equations (4) and (5).
[0041]
x”=[(ct2”)<2>−(ct1”)<2>+(x2)<2>−(x<1>)<2>]/[2(x2−x1)
] ・・・(4)
[0042]
y”=[(ct1”)<2>−(x2−x”)<2>]<1/2>
=[(ct2”)<2>−(x”−x1)<2>]<1/2>・・・(5)
[0043]
Here, for the first time t1 (t1 ', t1' ') and the second time t2 (t2', t2 ''), the fixed time that exists
systematically is compared with the propagation time of the measurement signal In the case of a
time that can not be ignored, the above equations (1) to (5) are calculated after correcting that
amount.
[0044]
When the position of the remote control 3 is detected by the method as described above, the
speaker control unit 25 controls the amplifier 26 and the delay amount so as to be an optimal
sound field at the detected position of the remote control 3 to obtain a sound image. It forms
(step S213).
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As described above, since the trigger of the position detection operation of the remote control 3
is the operation of the remote control 3 by the user, it can be considered that the position of the
remote control 3 is equal to the position of the user.
Therefore, by forming a sound image so as to obtain an optimum sound field at the position of
the remote control 3, a sound image to be an optimum sound field is formed at the position of
the user.
[0045]
As described above, according to the present embodiment, the position of the remote control 3 is
automatically calculated only by the simple process of measuring the time until the audio signal
output from the speaker SP of the speaker device 2 reaches the remote control 3. It becomes
possible to detect.
This can be realized by a simple configuration in which the microphone 32 and the signal
detection unit 33 for detecting the measurement audio signal are provided in the conventional
remote control 3.
[0046]
Further, in the present embodiment, the position detection operation is started by pressing the
position detection start button of the remote controller 3, but the trigger for starting the position
detection operation is not limited to pressing of the position detection button. For example, when
the input unit 31 detects various instructions from the user such as increase or decrease of the
sound volume when the speaker system 1 is started, the setting can be freely made as
appropriate.
[0047]
Further, in the present embodiment, the first measurement signal and the second measurement
signal may not be the same signal but may be other signals having different sound quality and
volume.
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In that case, the signal detection unit 33 can distinguish the first measurement signal and the
second measurement signal separately, which makes it possible to simultaneously output the first
measurement signal and the second measurement signal. As a result, the time taken for the
position detection operation of the remote control 3 can be shortened.
[0048]
Further, in the present embodiment, the position of the remote control 3 is detected for the
measurement audio signal output from the two speakers SP, but the measurement output from
three or more different speakers SP arranged in a row The position of the remote control 3 may
be detected based on the audio signal. By detecting the position of the remote control 3 from the
arrival time from more speakers, more accurate detection is possible.
[0049]
In the present embodiment, the position of the remote control 3 is detected based on the two
measurement audio signals, but the position of the remote control 3 may be detected based on
the three measurement audio signals. . In this case, the speakers SP are two-dimensionally or
three-dimensionally arranged, and measurement sound signals are output from the three
speakers SP at different positions, and the arrival time of each measurement sound signal to the
remote control 3 It is possible to detect a two-dimensional position.
[0050]
Next, a modification of the present embodiment is shown in FIG. FIG. 4 is a block diagram
showing a configuration of a modification of the speaker system according to the present
embodiment. In the speaker system shown in FIG. 4, the same components as those of the
speaker system shown in FIG. 1 are given the same names and reference numerals, and the
description thereof will be omitted as appropriate.
[0051]
The position detection unit 23 of the speaker device 2 includes a timer 23a, memory 23b storing
position information regarding an appropriate range of the position of the remote control 3, an
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operation unit 23c, and the position of the remote control 3 calculated by the operation unit 23c.
It is comprised from the determination part 23d which determines whether it is appropriate.
[0052]
The remote control 3 includes an input unit 31, a microphone 32, a signal detection unit 33, a
remote control control unit 34, a transmission unit 35, a light such as an LED (Light Emitting
Diode), an LCD (Liquid Crystal Display), and an FED The display unit 36 includes a display unit
such as a field emission display) or an organic electro luminescence (EL).
[0053]
In the speaker system shown in FIG. 4, when the position of the remote control 3 is computed by
the computing unit 23 c according to the above-described method, the determining unit 23 c
determines the computation result by the computing unit 23 c and the position information
stored in the memory 23 b. Then, it is determined whether the position of the remote control 3 is
appropriate.
[0054]
For example, when the position information of the memory 23b includes two threshold values,
which are the farthest position and the closest position from the speaker device 2 determined as
an appropriate position, the determination unit 23c determines the threshold value and the
operation unit 23c. The position of the remote controller 3 is compared with the position of the
remote controller 3 calculated by the above to determine whether the position of the remote
controller 3 is appropriate.
Here, when the position of the remote control 3 is between the two threshold values, the
determination unit 23c determines that the position of the remote control 3 is within an
appropriate range.
On the other hand, when the remote control 3 is positioned closer to the speaker device 2 than
the threshold value at the closest position, the determination unit 23 c determines that the
remote control 3 is too close to the speaker device 2.
When the remote control 3 is positioned farther from the speaker device 2 than the threshold
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value of the farthest position, the determination unit 23 c determines that the remote control 3 is
too far from the speaker device 2.
[0055]
When the position of the remote control 3 is in the appropriate range, the determination unit
23d functions as a notification unit, and after the beam parameter is set in step S213 of FIG. 2,
the position of the remote control 3 is in the appropriate range. An audio signal meaning “n” is
emitted from any one or more speakers SP via the speaker control unit 25. In this case, for
example, an audio signal is emitted such that the frequency is sequentially increased from the
low band to the high band as in Law → mid → High. Here, the audio signals of Law, mid, and
High may be, for example, signals having a band of about 1/3 octave band centered on 250 Hz,
500 Hz, and 1 kHz, respectively.
[0056]
On the other hand, when the position of the remote control 3 is not within the appropriate range,
the determination unit 23d does not use an audio signal indicating that the position of the
remote control 3 is not within the appropriate range. Sound is emitted from one or more
speakers SP. For example, when the remote control 3 is too close to the speaker device 2, an
audio signal is emitted starting with the audio signal on the low frequency side, raising the
frequency once, and returning to the low frequency side again, such as Law → mid → Law. Let
On the other hand, when the remote control 3 is too far from the speaker device 2, an audio
signal is emitted such as High → mid → High, starting from an audio signal on the high
frequency side, lowering the frequency once and returning to the high frequency side again. Let
[0057]
By emitting an audio signal that changes according to the position of the user in this manner, the
user can be positioned within the appropriate range, too close to the speaker device 2 or too far
from the speaker device 2. It becomes possible to easily determine which position it is.
[0058]
In addition, the audio signal which changes according to a user's position is not limited to the
above-mentioned Law → mid → High, Law → mid → Law, High → mid → High, etc. If a position
too close and a position too far from the speaker device 2 can be distinguished, they can be set
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freely as appropriate.
[0059]
In addition, when the signal detection unit 33 detects an audio signal as described above from
the sound reception signal of the microphone 32 of the remote control 3, the remote control
control unit 34 causes the display unit 36 to display according to the audio signal. Good.
[0060]
In this case, the signal detection unit 33 is provided with three band pass filters corresponding to
the low, mid, and high audio signals, and detects in what order the output of the audio signals
changes.
The remote control control unit 34 controls the display unit 36 based on the detection result.
For example, when the display unit 36 consists of three types of LEDs of blue, red and yellow, the
blue LED is turned on if the remote control 3 is within an appropriate range, the red if it is too
close, and the yellow if it is too far .
This enables the user to visually recognize from the remote control 3 at hand what situation the
user is in.
[0061]
In the case where the display unit 36 is configured of a display device, for example, the position
of the remote control 3 on the display unit 36, such as “It is an appropriate position”, “too
close to the speaker”, “too far from the speaker” You may be made to perform the character
display according to it. As a result, the user can more specifically visually recognize from the
remote control 3 at hand what situation the user's position is.
[0062]
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It is a block diagram showing composition of a speaker system of the present invention. It is a
sequence diagram which shows the position detection operation | movement of the speaker
system of this invention. It is a top view which shows the positional relationship of the speaker
apparatus 2 and remote control 3 of the speaker system of this invention. It is a block diagram
which shows the modification of a structure of the speaker system of this invention.
Explanation of sign
[0063]
DESCRIPTION OF SYMBOLS 1 ... Speaker system, 2 ... Speaker apparatus, 3 ... Remote control, 21
... Reception part, 22 ... System controller, 23 ... Position detection part, 23a ... Timer, 23b ...
Memory, 23c ... Arithmetic part, 23d ... Determination part, 24 ... Audio control unit, 25: speaker
control unit, 26: amplifier, 31: input unit, 32: microphone, 33: signal detection unit, 34: remote
control control unit, 35: transmission unit, 36: display unit, SP: speaker.
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