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JP2002112371

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DESCRIPTION JP2002112371
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic signal amplifier for amplifying an acoustic signal.
[0002]
FIG. 4 is a block diagram showing an example of a conventional acoustic signal amplifier. In the
conventional example, the acoustic signal amplification device is connected to the reproduction
device and the speaker.
[0003]
The acoustic signal amplification device 100 includes an input unit 2, a specific frequency
increase / decrease unit 3, an amplification unit 4, an operation unit 5, and a control unit 600.
The reproduction device 10 reproduces the acoustic data recorded on the optical disc and
outputs an acoustic signal. The input unit 2 inputs an acoustic signal output from the
reproduction device 10 and outputs the acoustic signal to the specific frequency increase /
decrease unit 3.
[0004]
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The operation unit 5 outputs, to the control unit 600, an amplification amount instruction signal
that instructs an amplification amount when amplifying an acoustic signal output from the
playback device 10 by operation. Further, operation unit 5 outputs to control unit 600 a
frequency domain increase / decrease instruction signal instructing to increase or decrease the
output level of a specified frequency region of the frequency of the acoustic signal, for example,
30 Hz to 50 Hz, by operation. .
[0005]
The control unit 600 controls to increase or decrease the amplification amount of the acoustic
signal amplified by the amplification unit 4 in accordance with the amplification amount
instruction signal output from the operation unit 5. Further, the control unit 600 controls the
specific frequency increase / decrease unit 3 to increase / decrease the output level in the
frequency range of 30 Hz to 50 Hz of the acoustic signal according to the frequency range
increase / decrease instruction signal output from the operation unit 5.
[0006]
The specific frequency increase / decrease unit 3 receives the acoustic signal output from the
input unit 2 under the control of the control unit 600, increases / decreases the output level in
the frequency range of 30 Hz to 50 Hz, and outputs it to the amplification unit 4. The
amplification unit 4 amplifies the acoustic signal output from the specific frequency increase /
decrease unit 3 under the control of the control unit 600, and outputs the amplified acoustic
signal to the speaker 11. The speaker 11 outputs an acoustic signal with the amount of
amplification amplified by the amplification unit 4.
[0007]
As described above, the sound signal amplification device 100 can amplify the sound signal
output from the reproduction device 10 and output the sound signal to the speaker 11 by the
operation of the operation unit 5. Further, the sound signal amplification device 100 can increase
or attenuate the level of the sound signal of the designated frequency region among the sound
signals output from the reproduction device 10 by the operation of the operation unit 5.
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[Problems to be solved by the invention]
[0008]
When the speaker 11 is installed in a room and the listener listens to the audio signal reproduced
by the playback device, the frequency characteristics of the sound that the listener listens to from
the speaker 11 changes depending on the location where the speaker 11 is installed.
[0009]
FIG. 5 is a schematic view showing an example of use of the conventional acoustic signal
amplifier in a room.
A speaker 11 is installed at a height H by a stand 16 on the floor 12 in the room. When the
listener 15 listens to the acoustic signal output from the speaker 11, there are direct sound
transmitted directly from the speaker 11 and indirect sound transmitted by reflection from the
floor 12, and the speaker 11 is at a high position away from the floor 12. When installed at a
lower position closer to the floor 12 than when installed, the lower frequency is enhanced and
transmitted to the listener 15.
[0010]
Therefore, when the listener 15 listens to the acoustic signal reproduced by the reproduction
device 10 by the speaker 11, the frequency characteristic of the sound to be heard changes
depending on the height at which the speaker 11 is installed. The listener 15 needs to correct the
frequency characteristic of the acoustic signal according to the installation height of the speaker
11 by operating the operation unit 5 in order to listen to the acoustic signal of the desired
frequency characteristic. When the installation height of the speaker 11 is frequently changed,
the frequency characteristic must be corrected by the operation of the operation unit 5 each
time, and the correction work is troublesome.
[0011]
An object of the present invention is to provide an acoustic signal amplifier that makes the
frequency characteristic of an acoustic signal constant regardless of a change in the height of a
speaker.
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[0012]
The invention according to claim 1 of the present application is an acoustic signal amplifying
apparatus for amplifying an acoustic signal, wherein the frequency is increased or decreased by
increasing or decreasing the output level of a predetermined frequency region among the
frequencies of the acoustic signal. Frequency characteristic changing means for changing the
characteristic, speaker height detecting means for detecting the height from the floor to the
speaker, and frequency property changing according to the height from the floor to the speaker
detected by the speaker height detecting means And controlling means for controlling the
frequency characteristic changing means so as to control the frequency characteristic changing
means.
[0013]
The invention according to claim 2 of the present application is the acoustic signal amplifier
according to claim 1, wherein the speaker height detection means comprises a fixing means fixed
to the speaker, an infrared light emitting means for emitting infrared light, and the infrared light
emission Infrared light receiving means disposed at a position substantially horizontally away
from the means and receiving infrared light output from the infrared light emitting means and
reflected from the floor, and an angle at which the infrared light receiving means receives
infrared light from the floor to the speaker And calculating means for calculating according to
BEST MODE FOR CARRYING OUT THE INVENTION
[0014]
One embodiment of the present invention will be described with reference to the drawings.
The same reference numerals are used for the same configuration as the configuration shown in
the prior art.
[0015]
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FIG. 1 is a block diagram showing an example of an acoustic signal amplifier according to an
embodiment of the present invention. In the present embodiment, the acoustic signal
amplification device is connected to the reproduction device and the speaker.
[0016]
The acoustic signal amplification device 1 includes an input unit 2, a specific frequency increase
/ decrease unit 3, an amplification unit 4, an operation unit 5, a control unit 6, and a height
detection unit 7. The reproduction device 10 reproduces the acoustic data recorded on the
optical disc and outputs an acoustic signal.
[0017]
The reproduction device 10 reproduces the acoustic data recorded on the optical disc and
outputs an acoustic signal. The input unit 2 inputs an acoustic signal output from the
reproduction device 10 and outputs the acoustic signal to the specific frequency increase /
decrease unit 3. The operation unit 5 outputs, to the control unit 6, an amplification amount
instruction signal that instructs an amplification amount when amplifying the acoustic signal
output from the reproduction device 10 by operation. The control unit 6 controls to increase or
decrease the amplification amount of the acoustic signal amplified by the amplification unit 4 in
accordance with the amplification amount instruction signal output from the operation unit 5.
[0018]
The height detection unit 7 is connected to the control unit 6 by a cord (not shown) made of a
conductive material. The height detection unit 7 is fixed to the speaker 11, detects the height of
the speaker 11 from the floor 12, and outputs the detected height of the speaker to the code as
speaker height data. The code transmits the speaker height data output from the height detection
unit 7 to the control unit 6. The configuration of the height detection unit 7 will be described
later.
[0019]
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The control unit 6 sets a predetermined frequency range, for example, 30 Hz, of the frequencies
of the acoustic signal output from the input unit 2 to the specific frequency increase / decrease
unit 3 according to the speaker height data output from the height detection unit 7 Control to
increase or decrease the output level at a frequency of ~ 50 Hz. Under control of the control unit
6, the specific frequency increase / decrease unit 3 receives the acoustic signal output from the
input unit 2, increases / decreases the output level in the frequency range of 30 Hz to 50 Hz, and
outputs the result to the amplification unit 4.
[0020]
The amplification unit 4 amplifies the acoustic signal output from the specific frequency increase
/ decrease unit 3 under the control of the control unit 6 and outputs the amplified acoustic signal
to the speaker 11. The speaker 11 outputs an acoustic signal with the amount of amplification
amplified by the amplification unit 4.
[0021]
Next, the configuration of the height detection unit 7 and the method of outputting the speaker
height data output by the height detection unit 7 will be described.
[0022]
FIG. 2 is a schematic view showing the configuration of the height detection unit 7 of the acoustic
signal amplifier of the present embodiment.
The height detection unit 7 has a box shape, and includes an infrared output unit 701, a holding
unit 702, an infrared light reception unit 703, and a calculation unit (not shown). The holding
unit 702 is disposed on the left side, and the infrared input / output unit 701 is disposed on the
bottom. The holding portion 702 is made of, for example, an adhesive, and adheres to the side
surface of the speaker described later by the adhesive force of the adhesive.
[0023]
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FIG. 3 is a schematic view showing a state in which the height detection unit 7 of the acoustic
signal amplification device of the present embodiment is fixed to the side surface of the speaker
11. As shown in FIG. 3, the height detection unit 7 is fixed to the side surface of the speaker 11
by the holding unit 702.
[0024]
The infrared output unit 701 emits infrared light radially downward. The infrared light receiving
unit 703 is disposed at a position substantially away from the infrared output unit 701 in the
substantially horizontal direction. The infrared light receiving unit 703 reflects the infrared light
emitted by the infrared output unit 701 by the floor 12 and receives the reflected infrared light.
The infrared light receiving unit 703 detects an angle from the direction in which the received
infrared light is incident to the infrared output unit 701, and outputs the detected angle as
incident angle data to the calculation unit.
[0025]
The calculation unit comprises a microcomputer and compares whether the incident angle data
from the infrared light receiving unit 703 is larger or smaller than predetermined angle data. The
calculation unit calculates that the height from the speaker 11 to the floor 12 is a predetermined
value (normal height) when the incident angle data from the infrared light receiving unit 703 is
the same as the predetermined angle data. The calculation unit calculates that the height from
the speaker 11 to the floor 12 is larger than a predetermined value (usually higher than the
height) when the incident angle data from the infrared light receiving unit 703 is larger than the
predetermined angle data. The calculation unit calculates that the height from the speaker 11 to
the floor 12 is smaller than a predetermined value (usually lower than the height) when the
incident angle data from the infrared light receiving unit 703 is smaller than the predetermined
angle data.
[0026]
The calculation unit outputs the calculated height from the speaker 11 to the floor 12 as speaker
height data to the control unit 6 through the above-described code. Thus, the height detection
unit 7 detects the height of the speaker 11 from the floor 12.
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[0027]
Next, the operation of the acoustic signal amplifier of this embodiment will be described. First, in
FIG. 1, the case where the height at which the speaker 11 is installed is a predetermined value
(normal height) will be described. The height detection unit 7 detects the height of the speaker
11 from the floor 12, and outputs speaker height data to the control unit 6. The control unit 6
determines that the height of the speaker 11 from the floor 12 is the normal height based on the
speaker height data from the height detection unit 7, and the control unit 6 outputs it to the
specific frequency increase / decrease unit 3 from the input unit 2 Control is performed so that
the output level of the acoustic frequency region of, for example, 30 Hz to 50 Hz of the acoustic
signal is output to the amplification unit 4 without increasing or decreasing. Under the control of
the control unit 6, the specific frequency increase / decrease unit 3 outputs the output level to
the amplification unit 4 without increasing or decreasing the output level of the frequency range
of 30 Hz to 50 Hz of the acoustic signal output from the input unit 2. The amplification unit 4
amplifies the acoustic signal output from the specific frequency increase / decrease unit 3 and
outputs the acoustic signal to the speaker 11. The speaker 11 outputs the acoustic signal
amplified by the amplification unit 4.
[0028]
Next, the case where the height at which the speaker 11 is installed is higher than the normal
height in FIG. 1 will be described. The height detection unit 7 detects the height of the speaker
11 from the floor 12, and outputs speaker height data to the control unit 6. The control unit 6
determines that the height from the floor 12 of the speaker 11 is usually higher than the height
based on the speaker height data from the height detection unit 7, and the sound output from the
input unit 2 to the specific frequency increase / decrease unit 3 Control is performed to increase
the output level of the signal in the frequency range of, for example, 30 Hz to 50 Hz and output
the signal to the amplification unit 4. Under the control of the control unit 6, the specific
frequency increase / decrease unit 3 increases the output level in the frequency range of 30 Hz
to 50 Hz of the acoustic signal output from the input unit 2 and outputs it to the amplification
unit 4. The amplification unit 4 amplifies the acoustic signal whose output level in the frequency
range of 30 Hz to 50 Hz is increased by the specific frequency increase / decrease unit 3 and
outputs the amplified sound signal to the speaker 11. The speaker 11 increases the output level
in the frequency range of 30 Hz to 50 Hz by the specific frequency increase / decrease unit 3
and outputs the acoustic signal amplified by the amplification unit 4 as a sound.
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[0029]
Next, the case where the height at which the speaker 11 is installed is lower than the normal
height in FIG. 1 will be described. The height detection unit 7 detects the height of the speaker
11 from the floor 12, and outputs speaker height data to the control unit 6. The control unit 6
determines that the height of the speaker 11 from the floor 12 is usually lower than the height
based on the speaker height data from the height detection unit 7, and the sound output from the
input unit 2 to the specific frequency increase / decrease unit 3 Control is performed to
attenuate the output level of the signal in the frequency range of, for example, 30 Hz to 50 Hz
and output it to the amplification unit 4. The specific frequency increase / decrease unit 3
attenuates the output level in the frequency range of 30 Hz to 50 Hz of the acoustic signal output
from the input unit 2 under the control of the control unit 6 and outputs the signal to the
amplification unit 4. The amplification unit 4 amplifies an acoustic signal whose output level in
the frequency range of 30 Hz to 50 Hz is attenuated by the specific frequency increase /
decrease unit 3 and outputs the amplified sound signal to the speaker 11. The speaker 11
attenuates the output level in the frequency range of 30 Hz to 50 Hz by the specific frequency
increase / decrease unit 3 and outputs the acoustic signal amplified by the amplification unit 4 as
a sound.
[0030]
As described above, the acoustic signal amplification device 1 detects the height of the speaker
11 from the floor 12 by the height detection unit 7, and the control unit 6 detects sound
according to the height of the speaker 11 from the floor 12. Increase or decrease the output level
of the low frequency domain of the signal.
[0031]
The acoustic signal amplification device 1 of the present embodiment changes the frequency
characteristic of the acoustic signal according to the height at which the speaker is installed, so
that the frequency characteristic of the acoustic signal heard by the listener due to the difference
in the installation height of the speaker Change can be prevented.
[0032]
The sound signal amplification device 1 of the present embodiment is configured to increase or
decrease the output level in the low frequency range of 30 Hz to 50 Hz of the sound signal
according to the height of the speaker, but the frequency characteristic of the sound output from
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the speaker is Depending on the degree of influence by the floor height, the output level of the
high frequency domain of 5 KHz to 20 KHz of the acoustic signal or the output level of other
frequency domains may be increased or decreased.
This can further prevent a change in frequency characteristics due to the height above the floor
of the speaker.
[0033]
In the acoustic signal amplification device 1 of the present embodiment, the infrared light
emitted from the infrared light output unit 701 is reflected by the floor 12, and the infrared light
receiving unit 703 receives the reflected infrared light from the direction in which the infrared
light is incident. Although the configuration is such that the angle up to 701 is detected, if the
material of the floor 12 is a material that does not reflect infrared light, a reflecting plate that
reflects infrared light may be installed on the floor 12.
By this, the height detection unit 7 can accurately detect the height from the floor of the speaker
11 regardless of the material of the floor 12.
[0034]
The height detection unit 7 of the acoustic signal amplification device 1 according to the present
embodiment is configured to be fixed to the side surface of the speaker 11. However, a thin plate
having a vertically expandable shaft and a thin plate held by the upper end of the shaft As a
stand provided with a mounting portion on which the speaker 11 can be mounted on the upper
surface, an infrared ray output unit 701 and an infrared light receiving unit 703 on the lower
surface of the mounting portion, Also good. As a result, since the height detection unit 7 can be
used as a speaker stand, the cost for installing the speaker can be reduced.
[0035]
The acoustic signal amplification device 1 of this embodiment is configured to output the speaker
height data detected by the height detection unit 7 to the control unit 6 by connecting the height
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detection unit 7 and the control unit 6 with a cord. However, the height detection unit 7 is
provided with an infrared output unit, the control unit 6 is provided with an infrared light
receiving unit, and the infrared output unit of the height detection unit 7 uses infrared light as
speaker height data. You may make it output to a light-receiving part. As a result, a cord
connected between the height detection unit 7 and the control unit 6 is not required, and
therefore, the speaker 11 with the height detection unit 7 fixed can be freely moved. 【Effect of
the invention】
[0036]
According to the present invention, it is possible to provide an acoustic signal amplifier that
makes the frequency characteristic of the acoustic signal constant regardless of the change in the
height of the speaker.
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