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JP2008294493

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008294493
To provide a sound quality correction device for a flexible speaker, which is capable of outputting
sound with stable sound quality even if the sheet-like and flexible speaker is deformed at the time
of use. SOLUTION: A receiving unit 6 connected to a sensor-equipped speaker 30 having a
bending sensor 4 for measuring a degree of bending of the speaker 3 and receiving an audio
signal, and an amplitude of a received audio signal are increased or decreased by a
predetermined amount for each frequency band. And a filter for selecting one of the filters 7
according to a preset condition according to a plurality of filters 7 each having a unique
correction pattern to be corrected and a degree of bending measured by the bending sensor 4 A
selection unit 8 is provided, and an audio signal corresponding to the degree of curvature of the
speaker 3 is output to the speaker 3 by the selected filter 7. [Selected figure] Figure 2
Loudspeaker correction device for flexible speaker and speaker system equipped with the same
[0001]
The present invention relates to an apparatus for correcting a change in sound quality due to a
change in shape of a speaker integrally mounted on a flexible display.
[0002]
In recent years, development of thin and lightweight image display devices called electronic
paper, electronic books, and the like has been advanced.
08-05-2019
1
In particular, a flexible sheet-like image display device (flexible display) can be provided on a
curved surface such as a cylinder, and since it can be rolled and stored, even a large screen is
portable. It is attracting attention as a display device such as a PDA (Personal Digital Assistant) or
the like for posting an advertisement or the like without losing its quality.
[0003]
The inventors of the present invention tried to make, for example, a flexible television receiver
capable of outputting both an image and a sound by providing a speaker in the flexible display.
[0004]
A speaker integrated with a display has already been put to practical use in a notebook personal
computer (PC), a liquid crystal display device of a mobile phone, and the like.
In this method, a transparent acrylic plate or the like is disposed on the display surface side of
the display device, an actuator (exciter) is attached to the peripheral edge portion, and the acrylic
plate or the like is vibrated to output sound. Patent Document 1 discloses a technique in which a
diaphragm of a speaker is integrated with a display surface. Further, Patent Document 2 also
discloses a technology of a speaker which is flexible and continuously provided in a folding
portion of a mobile phone. Further, Patent Document 3 discloses a technology of a display that
incorporates a speaker while having flexibility. Further, Patent Document 4 discloses a
technology of a speaker that outputs excellent sound quality even when the diaphragm is a
curved surface by providing a plurality of piezoelectric elements for driving the diaphragm.
[0005]
On the other hand, there is known a technology for correcting the sound quality in real time
according to the ambient noise etc. as the improvement of the quality of the output voice, and the
patent document 5 discloses an on-vehicle audio equipped with a microphone for capturing
noise. A device, for example, Patent Document 6 discloses a technology for amplifying and
automatically correcting the volume of the output voice in the same frequency band as the noise
for each of the receiver devices of the mobile phone. JP-A 2003-211087 (claim 1) JP-A 200533505 (paragraphs 0047 to 0058, FIG. 5) JP-A 2003-125315 (paragraphs 0009 to 0012) JP-A8-88896 (paragraph) [0006] JP-A-5-299957 (Claim 1) JP-A-9-46154 (Paragraphs 0025-0026)
08-05-2019
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[0006]
Here, in the case of the flexible speaker, when the shape (the degree of bending) of the
diaphragm of the speaker changes, the sound quality (amplitude frequency characteristics,
volume) changes regardless of the driving means of the diaphragm. In the above-mentioned prior
art, it is not assumed that the speaker completed as a product will deform either, and also about
patent documents 3, it is not verified about the modification of a speaker, and the sound quality.
Also in Patent Document 2, the portion in the folding unit of the mobile phone does not function
as a diaphragm. Therefore, at the time of use, i.e., at the time of voice output, it is necessary to fix
with a frame to a set shape such as a plane. This is not a problem when using fixedly, such as
advertisements, but when held and viewed in a loosely flexed document-like state like a
newspaper or magazine for portable use, the sound quality may differ from time to time
Therefore, it is necessary to provide and fix a support member such as a frame, which increases
the size and weight of the speaker when stored. On the other hand, there is also a method in
which the diaphragm is not integrated with the flexible display, and the speaker is stored in a
housing so as not to be deformed, for example, provided at the end of the flexible display.
However, in this case, the size of the device is increased by the size of the housing and the
portability is impaired, and the area of the diaphragm is reduced, making it difficult to increase
the volume, which is unsuitable for advertising and the like.
[0007]
The present invention has been made in view of the above problems, and provides a sound
quality correction apparatus for a flexible speaker, which is integrally provided on a flexible
display and can output sound with stable sound quality even when deformed. To aim.
[0008]
In order to solve the above problems, the present inventors pay attention to the fact that the
displacement difference of the sound quality is the same when the degree of deformation of the
diaphragm, that is, the curvature (curvature) is the same, according to the curvature of the
diaphragm. I came to the idea of correcting the audio signal.
[0009]
That is, the sound quality correction apparatus according to claim 1 is connected to a sensorequipped speaker including a sheet-like flexible speaker and sensor means for measuring the
degree of bending of the speaker, and the sound quality of the output sound of the speaker A
sound quality correction apparatus for correcting, comprising: an audio signal receiving means
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3
for receiving an audio signal; and an inherent correction pattern for correcting an audio signal
received by the audio signal receiving means to increase or decrease an amplitude by a
predetermined amount for each frequency band. And a selection means for selecting one of the
filters according to a preset condition according to the degree of curvature measured by the
sensor means, and the selection means selects The audio signal corrected by the filter is output
to the speaker.
[0010]
With this configuration, it is possible to output a stable sound even if the sheet-like speaker is
deformed.
[0011]
In the sound quality correction apparatus according to a second aspect of the present invention,
in the sound quality correction apparatus according to the first aspect, the selection unit is
configured to select the filter according to a preset condition according to the degree of
curvature measured by the sensor unit. And combining the filter coefficients preset in the two
filters selected by the selection means at a ratio according to the degree of curvature, and the
voice signal receiving means according to the combined filter coefficients Filter-synthesized
speech correction means for correcting the received speech signal, and outputting the speech
signal corrected by the filter-synthesized speech correction means to the speaker.
[0012]
With this configuration, the correction pattern can be subdivided into more than the number of
filters, so that the accuracy of the sound quality of the output voice is improved.
[0013]
According to a third aspect of the present invention, there is provided a speaker system
including: a sensor-equipped speaker having a sheet-like flexible speaker and a sensor means for
measuring the degree of bending of the speaker; and correcting the sound quality of the output
sound of the speaker The sound quality correction apparatus according to claim 1 or 2, wherein
the sensor means is provided along a surface or a peripheral portion of the speaker over a
predetermined length.
[0014]
With such a configuration, it is possible to obtain a speaker system that outputs stable sound
regardless of the shape of the sheet-like speaker in use.
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[0015]
A speaker system according to a fourth aspect of the present invention is the speaker system
according to the third aspect, wherein the speaker has a rectangular shape in a plan view, and
the sensor means is provided along the lateral side of the speaker A first sensor for measuring
the degree of bending in the lateral direction of the speaker, and a second sensor for measuring
the degree of bending in the vertical direction of the speaker provided along the longitudinal side
of the speaker I assume.
[0016]
With this configuration, it is possible to obtain a speaker system that outputs a stable sound with
respect to the curvature in the vertical and horizontal directions of the sheet-like speaker having
a rectangular shape in plan view.
[0017]
According to the sound quality correction device of the first aspect, by providing the sound
quality correction device, the sheet-like speaker can obtain an output sound with stable sound
quality even if the shape in use changes.
According to the sound quality correction device of the second aspect, it is possible to obtain an
output sound of more stable sound quality.
[0018]
According to the speaker system of claim 3, the speaker system can be rolled up and folded, so
that even when it is enlarged (larger area), it does not impair portability, and a speaker system
with stable sound quality is not limited in its shape during use. It is possible.
In addition, since it is not necessary to fix the speaker in a specific shape, the place and state of
use are not limited, and the support member is not necessary if the size is large enough for the
user to hold by hand. There is no need to fix the entire surface, for example, by suspending it
alone.
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5
According to the speaker system of the fourth aspect, it is possible to provide a stable sound
quality speaker system even as a speaker that deforms in two directions.
[0019]
Hereinafter, the best mode for realizing the sound quality correction device according to the
present invention will be described with reference to the drawings.
FIG. 1 is a schematic view of a flexible display with a speaker including the sound quality
correction device according to the present invention, (a) is an external view, and (b) is a crosssectional view of the flexible display with a speaker.
FIG. 2 is a block diagram showing the configuration of the speaker system according to the
embodiment of the present invention.
Hereinafter, the sound quality correction device according to the present invention, and each
component of the flexible display with a speaker including the same will be described.
[0020]
As shown in FIG. 1A, the flexible display with speaker 10 is flexible, has a rectangular sheet
shape in plan view, and is connected to a video signal input cable and an audio signal input cable.
Further, as shown in FIG. 1 (b), the configuration includes a display (display device) 2 and a
speaker 3.
In addition, the flexible display 10 with a speaker is provided with a bending sensor (sensor
means) 4 that measures the degree of bending.
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[0021]
The display 2 is configured of an organic EL (electroluminescence), a liquid crystal, an organic
TFT (thin film transistor), a composite of these, or the like.
The display 2 shown in FIG. 1 (b) is made of an organic EL.
Moreover, the drive device etc. which are not shown in figure are also provided. In either method,
since the substrate (the transparent substrate 21 and the sealing substrate 24) is made of a
flexible material such as plastic, the entire device has flexibility. The thickness of the display 2 is
0.1 to 0.5 mm, depending on the method and the like.
[0022]
The speaker 3 is provided integrally with the display 2 and drives a piezoelectric film 32 which is
a film-like piezoelectric body to vibrate it and output sound. The piezoelectric film 32 is, for
example, polyvinylidene fluoride (PVDF: Poly VinyliDene Fluoride), and as shown in FIG. 1B, the
back surface side of the display 2 (image display surface) is sandwiched between a pair of
electrodes 33a and 33b. It is arranged on the surface). The PVDF membrane sandwiched by the
electrodes is about 0.1 mm. If the piezoelectric film 32 and the electrodes 33a and 33b are
transparent materials, they may be disposed on the surface side of the display 2.
[0023]
The bending sensor 4 comprises a first sensor 41 provided along the lower side of the speakerequipped flexible display 10 and a second sensor 42 provided along the left side, each of which
is in the X and Y directions of the speaker-equipped flexible display 10 Measure the degree of
curvature of the The bending sensor 4 (41, 42) may be a known one, for example, also referred
to as a strain gauge, which is made of a material whose electric resistance changes due to
bending and which causes a specific change in resistance according to the curvature. Be The
curvature value is 0 (plane), the resistance value is about 10 kΩ, and when the curvature is made
tight (the curvature is increased), it increases to 30 to 40 kΩ. That is, the bending sensor 4 is a
variable resistor, and outputs a voltage that fluctuates with respect to a constant current
08-05-2019
7
according to the curvature of the flexible display 10 with a speaker. Although the bending sensor
4 is provided at the peripheral portion of the speaker 3, the bending sensor 4 may not be
provided over the entire peripheral length if the bending degree of the speaker 3 can be
measured, and the speaker 3 (and display 2) As long as there is no hindrance to driving or
viewing of the image, it may be provided in the plane of the speaker 3. There is also a method of
providing a piezoelectric body separately from the piezoelectric film 32 of the speaker 3 and
measuring the change in shape of the diaphragm by the output voltage.
[0024]
As shown in FIG. 2, the sound quality correction device 5 includes a receiver (audio signal
receiving means) 6 for receiving the audio signal S0 and a plurality of filters 7 (71, 72,..., 7N for
correcting the received audio signal S0. And a filter selection unit (selection means) 8 for
selecting one of the filters 71, 72,..., 7N according to the output of the bending sensor 4. And as
shown to Fig.1 (a), the sound quality correction apparatus 5 may be stored in the housing |
casing connected to the flexible display 10 with a speaker via a cable, or the edge part of the
flexible display 10 with a speaker etc. May be provided directly to The cable is a cable connected
to the bending sensor 4 and an output of the sound quality correction device 5, and the latter is
an audio signal input cable of the flexible display 10 with a speaker. In addition, on the outside of
the housing, a power ON / OFF switch, a sound quality correction function ON / OFF switch, a
channel switching switch, a volume control knob, etc. are provided (not shown).
[0025]
The receiving unit 6 is an interface device (I / F) that receives the audio signal S0 of the audio
output from the speaker 3, and may be connected to an antenna as shown in FIG. It may be
connected to the output terminal.
[0026]
A plurality of filters 7 are provided, one of which receives the audio signal S0 received by the
receiving unit 6 based on an instruction of the filter selecting unit 8, corrects the sound quality of
the signal, and outputs the corrected sound signal to the speaker 3.
The correction is performed by increasing or decreasing the amplitude and gain by a
predetermined amount for each frequency band and outputting the input audio signal, the details
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8
of which will be described later. The filter 7 is a so-called equalizer and is designed based on a
known method.
[0027]
The filter selection unit 8 receives an output voltage of the bending sensor 4 and a bending
information processing unit 81 which is an arithmetic unit (CPU) for distributing the output
voltage to a plurality of stages with a predetermined threshold value, and a filter according to the
stages 7, a selection unit 82 for selecting one, a filter switching unit 84 for driving one filter 7
selected by the selection unit 82, a program for executing these processes, a threshold of output
voltage, and a selection condition of the filter 7 are stored. And a memory 83. Therefore, the
filter selection unit 8 includes an arithmetic unit (CPU) and a memory.
[0028]
Next, the detailed configuration of the correction method and the sound quality correction device
by the sound quality correction device according to the embodiment of the present invention will
be described with reference to FIG. 2, FIG. 3 and FIG. FIG. 3 is a graph showing the amplitude
frequency characteristic of the output sound when the curvature of the speaker is changed, and
FIG. 4 is a view showing an image for correcting the amplitude frequency characteristic of the
sound.
[0029]
As shown in FIG. 3, when the curvature of the speaker 3 is changed, the sound quality of the
output sound by the same sound signal S0, that is, the amplitude with respect to the frequency
and the volume (≒ amplitude) change. The relationship between the curvature of the speaker 3
and the sound quality of the output sound is constant. That is, if the shape (the degree of
bending) of the speaker 3 is the same, the sound quality of the output sound matches. From this,
the sound quality correction pattern corresponding to the deformation of the speaker 3 is
registered in advance, and the sound is corrected by the filter 7 (71, 72, ..., 7N) in which the
sound quality correction pattern is registered according to the shape of the speaker 3. If the
signal S0 is converted and output to the speaker 3, a sound having a desired sound quality is
output.
08-05-2019
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[0030]
FIG. 4 is a view showing an image for correcting the amplitude frequency characteristic of
speech, and at the same time shows the amplitude frequency characteristic of FIG. 3 based on the
original sound quality of the speech signal S0 (= 0). It is also a figure. In order to fill in the
difference with this reference, either the curvature A or B is corrected by correcting the audio
signal S0 with the filter 7 (7A, 7B) that performs different correction according to the two types
of curvature A, B of the speaker 3. Also in the speaker 3 of the shape of, voice is output with the
original sound quality. The filters 7 (71, 72,..., 7N) have different amounts of increase / decrease
in amplitude (correction values) set therein. The number of filters 7 is equal to the number of
sound quality correction patterns, but the more the number, that is, the finer the sound quality
correction patterns are, the more accurate the sound quality correction.
[0031]
The number of sound quality correction patterns, that is, the number of filters 7 is the number of
patterns of the shape of the speaker 3 as it is. Since the change in shape of the flexible speaker 3
is inherently infinite, the pattern of the shape is such that there is no sense of incongruity in the
sound quality after correction in the range of the change in shape when the speaker 3 is used (at
the time of audio output) Let's divide it into finite.
[0032]
The shape of the speaker 3 is divided into a plurality of patterns (steps) from the curvature
measured by the bending sensor 4 provided on the periphery of the speaker 3. This curvature is
output, for example, as an analog voltage as described above. In FIG. 1 (a), the bending sensor 4
(41, 42) is provided on each side of the speaker 3 (flexible display 10 with a speaker) in the
longitudinal and lateral directions. For example, the speaker 3 is a cylinder having an Y axis. If it
is a structure which only rounds in a shape, only the first sensor 41 in the X direction may be
provided. Furthermore, in order to deform only in the direction in which the image display
surface side is inward (concave surface), it is sufficient to provide the bending sensor 4 in one
direction. In such a case, the number of patterns of the shape of the speaker 3 is also reduced, so
the number of filters 7 is reduced. On the other hand, in the case where the curvature differs
between the upper and lower portions or between the left and right as in the case of a pyramidal
shape, it is necessary to provide the bending sensors 4 on two opposing sides. Furthermore, in
08-05-2019
10
the case where it is assumed that the large-sized speaker 3 has such a shape that the curvature
largely varies depending on the position on one side thereof, the bending sensor 4 is divided and
provided. When the plurality of bending sensors 4 are provided as described above, the
curvatures of the bending sensors 4 are combined and distributed to the pattern of the shape of
the speaker 3. As such a method, for example, a matrix-like distribution table is stored in the
memory 83 of the filter selection unit 8 or the like. These processes are executed by the bending
information processing unit 81 of the filter selection unit 8.
[0033]
Next, the correction procedure by the sound quality correction apparatus according to the
embodiment of the present invention will be described with reference to FIG. 4, FIG. 5 and FIG. 2
as needed. FIG. 5 is a diagram for explaining the process of correcting the audio signals at the
two curvatures of the speaker.
[0034]
At the time of manufacture (before shipment), the sound quality correction device 5 is set with a
threshold for dividing the output voltage of the bending sensor 4 in stages from the correlation
between the curvature of the speaker 3 and the sound quality measured in advance. The setting
condition for selecting 7 (7A, 7B) and the threshold value are stored in the memory 83 of the
filter selection unit 8. The correlation between the curvature of the speaker 3 and the sound
quality may be actually measured by the speaker 3 of the same shape, or may be calculated by
simulation or the like.
[0035]
When the flexible display 10 with a speaker and the sound quality correction device 5 are
activated, the receiving unit 6 receives the audio signal S0. When the audio signal S0 is received,
the receiver 6 instructs the filter selector 8 to select the filter 7. The filter selection unit 8
receiving the instruction from the reception unit 6 receives the output voltage of the bending
sensor 4 and the bending information processing unit 81 determines the stage based on the
stored threshold value and selection condition. Then, the selection unit 82 designates one filter 7
(7A or 7B) corresponding to this stage, and the filter switching unit 84 drives the designated
filter.
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[0036]
Next, the filter 7A (or the filter 7B) designated by the filter selection unit 8 (selection unit 82)
receives the audio signal S0 from the reception unit 6, corrects it, and outputs it to the speaker 3.
When the audio signal S1a corrected by the filter 7A is output by the speaker 3 of curvature A,
an output audio of the original sound quality can be obtained. Similarly, when the audio signal
S1b corrected by the filter 7B is output by the speaker 3 with the curvature B, the output audio
of the same sound quality is obtained. Then, the selection of the filter 7 is repeated every
predetermined time, so that the sound quality of the output sound should have the sound quality
even if the shape of the flexible display 10 with a speaker (speaker 3) changes during use (during
sound output). Will be kept. The predetermined time for repeating the selection of the filter 7 is
not particularly limited, but is preferably set according to the area and application of the flexible
display 10 with a speaker. When the shape of the flexible display 10 with a speaker is fixed and
used, the filter 7 may be selected only when the power is turned on or when reception of an
audio signal is started. Although the receiving unit 6 outputs the selection instruction of the filter
7 to the filter selecting unit 8, the filter selecting unit 8 may inquire the receiving unit 6 whether
or not the audio signal is received.
[0037]
Depending on the curvature of the speaker 3, the filter selection unit 8 may not select any of the
filters 7, and may output the audio signal S0 to the speaker 3 as it is without correction. In this
case, the number of filters 7 is smaller than the number of patterns of the shape of the speaker 3.
Further, instead of providing a plurality of filters 7 in accordance with individual correction
patterns, one filter 7 capable of changing the amplitude increase / decrease amount is provided,
and a plurality of correction patterns are stored in advance in memory 83. Alternatively, the filter
7 may be rewritten by selecting one of them. In this case, since the filter 7 is one, the filter
switching unit 84 is unnecessary.
[0038]
Next, the correction procedure by the sound quality correction device according to another
embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram
for explaining correction of an audio signal by the sound quality correction device according to
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12
another embodiment of the present invention. In addition, description is abbreviate | omitted
about the element which is common in the said embodiment.
[0039]
The sound quality correction device 51 according to the present embodiment further includes a
filter synthesized speech correction unit (filter synthesized speech correction unit) 9. Then, when
the bending information processing unit 81 receives the output voltage of the bending sensor 4
and distributes the stage of the curvature C, if the curvature does not substantially match the
correction pattern of each of the plurality of filters 7, the bending information processing unit 81
The curvatures A and B closest to the curvature C are detected. Furthermore, a position x
between the curvatures A and B of the curvature C, that is, a ratio x (0 <x <1) at which the
curvature C = x * curvature A + (1−x) * curvature B is calculated is calculated. From this
equation, the ratio x can be calculated by x = (curvature C−curvature B) / (curvature
A−curvature B), so the bending information processor 81 (filter selection unit 8) performs filter
synthesis on this ratio x. It is transmitted to the voice correction unit 9. On the other hand, in
response to the detection result of the bending information processing unit 81, the selecting unit
82 selects two filters 7 of the filter 7A corresponding to the curvature A and the filter 7B
corresponding to the curvature B.
[0040]
The selected filters 7A and 7B output the filter coefficients (amplitude increase and decrease
amount by frequency band) Ka and Kb to the filter synthesis speech correction unit 9. The filter
synthesis speech correction unit 9 combines these two filter coefficients Ka and Kb based on the
ratio x obtained from the filter selection unit 8 to obtain a filter coefficient Kc. すなわち、
x*Ka+(1−x)*Kb=Kc、となる。 Then, the audio signal S0 is received from the
receiving unit 6 and corrected according to the obtained filter coefficient Kc to obtain an audio
signal S1c. The corrected audio signal S1c is output to the speaker 3 of curvature C. With such a
configuration, it is not necessary to provide the filters 7 as many as the number of patterns of the
shape of the speaker 3, and the error between the sound quality of the output sound and the
sound quality to be reduced can be reduced and the accuracy is improved.
[0041]
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13
By the above method, it is possible to correct the sound quality accompanying the change in
shape of the flexible sheet-like speaker. In addition, a function that can be selected by the user
may be added to the above-described voice correction device so as not to perform sound quality
correction (sound quality correction OFF). Also, a filter (not shown) may be separately provided
on either the input or output side of the filter 7, and a function of increasing or decreasing the
amplitude according to the volume adjustment operation by the user may be added. Furthermore,
another filter (not shown) may be provided, a microphone may be provided in the speakerequipped flexible display 10 or the sound quality correction device 5, and sound quality
correction corresponding to ambient noise may be combined. When the sound quality correction
device according to the present invention is provided in a flexible display with a speaker, it may
be integrated with a video device (a video signal receiving device, an image quality adjustment
device, etc.) for inputting a video signal to the display. If a flexible display with a speaker and a
sound quality correction device (and an image device) are used as a common power supply, a
pair of power cables is sufficient. Moreover, although the speaker was demonstrated as an
apparatus (flexible display with a speaker) integral with a flexible display, the same sound quality
correction is possible also in the apparatus of a speaker independent.
[0042]
Further, the speaker 3 may be configured to include a diaphragm and an actuator 31 for driving
the diaphragm. FIG. 7 shows a cross-sectional view of a flexible display with a speaker according
to another aspect provided with the sound quality correction device according to the present
invention. As shown in FIG. 7, the actuator 31 is provided at the end of the display 2 and drives
the display 2 as a diaphragm. Alternatively, the display 2 may be provided on the back side to
drive the sealing substrate 24 (see FIG. 1B) of the display 2 as a diaphragm, or may be provided
on the front side of the display 2. The transparent substrate 21 may be driven as a diaphragm.
The arrangement of the actuator 31 is not particularly limited as long as it does not hinder the
driving and display of the display 2, and is arranged according to the size of the diaphragm
(display 2) and the function of the speaker 3. Further, the diaphragm may not be provided in the
entire area of the display 2 in accordance with the function of the speaker 3 or may be provided
separately. The actuator 31 is known and includes, for example, a piezo element, and an
electrodynamic actuator including a coil and a magnet. In addition, since the structure of the
display 2 is the same as that of FIG.1 (b), description is abbreviate | omitted.
[0043]
Although the best mode for carrying out the present invention has been described above,
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examples of the present invention will be specifically described below. The present invention is
not limited to this embodiment.
[0044]
The sound quality correction device according to the invention for a flexible television receiver is
produced. First, a television receiver to be subjected to sound quality correction is manufactured.
The television receiver was approximately A4 in size, and the size of the display screen was 297
× 210 mm. In the present embodiment, a portable television receiver is used, and it is assumed
that the display (and the speaker) is deformed only in the direction in which the display screen is
concave. That is, the display screen is turned inward and the container is rolled and stored, and
in use, the left and right sides are gripped with both hands, or a flat (or loose concave) is
maintained while gripping one place or standing on a wall or the like I assumed the configuration
to be The display method was organic EL.
[0045]
The speaker used plastic film which is a substrate on the back side of the display as it was as a
diaphragm, and 12 actuators for micro-speaker for notebook type PC (Foster Electric Co., Ltd.)
were arranged as actuators as 12 left and right ends of the display. . Then, a plastic film was
further adhered for sealing to complete a television receiver. The thickness of the completed
television receiver was about 0.3 mm. A cable for inputting an audio signal and a video signal
was connected to the television receiver.
[0046]
In this embodiment, since the television receiver performs sound quality correction when it is
deformed only in the X direction (longitudinal direction), the bending sensor (made by Asakusa
Giken Co., Ltd.) is along the lower side of the television receiver. I stuck one. Two cables for input
voltage and output voltage connected to the sound quality correction device were connected to
this bending sensor.
[0047]
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Next, the sound quality correction device is designed. First, an amplitude frequency characteristic
due to a change in the degree of curvature of the television receiver is measured. The input
voltage cable of the bending sensor provided in the television receiver was output to the DC
power supply, and the output voltage cable was output to the voltmeter. In addition, an audio
signal input device for test was connected to an audio signal input cable connected to the
television receiver. Then, the voice was output while deforming the television receiver, and the
amplitude frequency characteristic of the output voice and the output voltage from the bending
sensor were simultaneously measured.
[0048]
The amplitude frequency characteristics of the obtained output speech were divided into several
patterns according to the degree of the variation. As described above, since the television
receiver in the present embodiment is configured to be deformed only in one direction in the X
direction, the curvature is uniform, and the range of the change is a curvature radius of 10 to
170 cm assuming the use state. did. The amplitude frequency characteristic of the output voice
in the shape of this range has a variation of amplitude in the range of ± 10 dB. Based on this
result, the amplitude frequency characteristics are divided into five patterns. Then, the output
voltage from the bending sensor which matches the distribution division of the amplitude
frequency characteristic pattern is set as the threshold value.
[0049]
Next, a filter for correcting an audio signal according to each pattern of the amplitude frequency
characteristic was produced. Since there were five patterns of amplitude frequency
characteristics, five filters were also produced. Then, connect these filters, the audio signal I / F
(corresponding to the receiving unit 6 in FIG. 2), the microcomputer device (corresponding to the
filter selecting unit 8 in FIG. 2), and the bending sensor cable as shown in FIG. Thus, the sound
quality correction apparatus in this example was manufactured.
[0050]
The output terminal (output of filter) of the produced sound quality correction device is
connected to the audio signal input cable of the television receiver, and the audio signal input
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device for test is input to the input terminal (input of audio signal I / F) of the sound quality
correction device. Connected. Then, the speaker was driven while deforming the television
receiver within a radius of curvature of 10 to 170 cm, and the amplitude frequency characteristic
of the output sound was measured. As a result, the fluctuation of the amplitude was within ± 2.5
dB, and an output sound without discomfort was obtained. In addition, the maximum amplitude
(maximum volume) of the output sound is 70 dBSPL or more at the minimum curvature, which is
the volume that can be sufficiently heard by a person at a distance of approximately 1 m from
the television receiver in the vertical direction. .
[0051]
It is a schematic diagram of the flexible display with a speaker provided with the sound quality
correction apparatus which concerns on this invention, (a) is an external view, (b) is sectional
drawing of the flexible display with a speaker. It is a block diagram showing composition of a
speaker system concerning an embodiment of the present invention. It is a graph which shows
the amplitude frequency characteristic of the output sound when changing the curvature of a
speaker. It is a figure which shows the image which correct | amends the amplitude frequency
characteristic of an audio | voice. It is a figure explaining the process which correct | amends
each audio | voice signal in two types of curvature of a speaker. It is a figure explaining
correction | amendment of the audio | voice signal by the sound quality correction apparatus
which concerns on another embodiment of this invention. It is sectional drawing of the flexible
display with a speaker of another aspect provided with the sound quality correction apparatus
which concerns on this invention.
Explanation of sign
[0052]
Reference Signs List 1 speaker system 10 flexible display with speaker 2 display 30 speaker with
sensor 3 speaker 31 actuator 32 piezoelectric film 4 bending sensor (sensor means) 41 first
sensor 42 second sensor 5, 51 sound quality correction device 6 receiving unit (audio signal
receiving means 7, 7 1, 72, ..., 7 N filter 8 filter selection unit (selection means) 9 filter synthesis
speech correction unit (filter synthesis speech correction means)
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