JP4960765B2 - Sound quality correction device for flexible speaker and speaker system including sound quality correction device - Google Patents

Description

  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.

  In recent years, development of thin and lightweight image display devices called electronic paper, electronic books, and the like has been underway. In particular, a flexible sheet-like image display device (flexible display) can be provided on a curved surface such as a cylinder, and can be rolled and stored, so that even a large screen is portable. It has been attracting attention as a display device for posting advertisements and the like, and a PDA (personal digital assistant).

  The inventors of the present invention attempted to provide a flexible television receiver capable of outputting both images and sounds by providing a speaker in the flexible display.

  A speaker integrated with a display has already been put into practical use in a notebook personal computer (PC), a liquid crystal display device of a mobile phone, and the like. In this case, a transparent acrylic plate or the like is disposed on the display surface side of the display device, and an actuator (exciter) is attached to the peripheral portion to vibrate the acrylic plate or the like to output sound. Patent Document 1 discloses a technique in which a diaphragm of a speaker is integrated with a display surface. Furthermore, Patent Document 2 also discloses a speaker technology that has flexibility and is continuously provided in a folding portion of a mobile phone. Patent Document 3 discloses a display technology in which a speaker is incorporated with flexibility. Patent Document 4 discloses a speaker technology that provides a plurality of piezoelectric elements for driving a diaphragm to output excellent sound quality even when the diaphragm is curved.

On the other hand, a technique for correcting the sound quality in real time according to ambient noise or the like is known as an improvement in the quality of the output sound. Patent Document 5 discloses a vehicle-mounted audio equipped with a microphone for capturing noise. Patent Document 6 discloses a technique for amplifying and automatically correcting the volume of output voice in the same frequency band as that of noise for each mobile phone receiver.
JP 2003-211087 A (Claim 1) Japanese Patent Laying-Open No. 2005-33505 (paragraphs 0047 to 0058, FIG. 5) JP 2003-125315 A (paragraphs 0009 to 0012) JP-A-8-88896 (paragraphs 0006 to 0007) JP-A-5-299957 (Claim 1) JP-A-9-46154 (paragraphs 0025 to 0026)

  Here, in the case of a flexible speaker, when the shape (degree of curvature) of the diaphragm of the speaker changes, the sound quality (amplitude frequency characteristics, volume) changes regardless of the driving means of the diaphragm. None of the above prior arts assumes that a speaker completed as a product will be deformed, and Patent Document 3 does not verify the relationship between speaker deformation and sound quality. Also in Patent Document 2, the portion in the folded portion of the mobile phone is not functioning as a diaphragm. Therefore, at the time of use, that is, when outputting sound, it is necessary to fix the frame to a set shape such as a plane. This is not a problem when it is used in a fixed manner, such as for advertisements, but if it is held as if it is portable and held in a loosely bent state like a newspaper or magazine, the sound quality will sometimes differ. Therefore, it is necessary to provide and fix a support member such as a frame, which increases the size and weight when the speaker is stored. On the other hand, there is a method in which the diaphragm is not integrated with the flexible display, and the speaker is stored in the housing so as not to be deformed, and is provided at the end of the flexible display, for example. However, in this case, the device becomes larger by the amount of the casing, thereby impairing portability. Further, since the area of the diaphragm is reduced, it is difficult to increase the volume, which is not suitable for advertisements and the like.

  The present invention was devised in view of the above problems, and provides a sound correction device for a flexible speaker that is provided integrally with a flexible display and that can output sound with stable sound quality even when deformed. Objective.

  In order to solve the above-mentioned problem, the present inventors pay attention to the fact that when the degree of deformation of the diaphragm, that is, the curvature (degree of curvature) is the same, the displacement difference in sound quality is also the same, and according to the curvature of the diaphragm. It came to the idea of correcting the audio signal.

That claim sound quality correction device according to 1, the sound quality correction for correcting sensor-attached speaker and a sensor means for measuring a speaker having flexibility in sheet form the curve degree of the speaker, the sound quality of the output sound an apparatus, and an audio signal receiving means for receiving an audio signal, the audio signal received by the audio signal receiving means corrects to increase or decrease a predetermined amount of amplitude for each frequency band, the curve degree the speaker-specific A plurality of filters each having a unique correction pattern for generating an audio signal that outputs a sound of the original sound quality, and the inherent curvature corresponding to the degree of curvature measured by the sensor means of the sensor-equipped speaker. one filter having a specific correction pattern for correcting in degree, selected from the plurality of filters according to a preset condition Comprising selection means that, the, and outputs a voice signal corrected by the selected filter by the selection means to the sensor with the speaker.

  With this configuration, it is possible to output stable sound even if the sheet-like speaker is deformed.

The sound quality correction apparatus according to claim 2 is the sound quality correction apparatus according to claim 1, wherein the selection means has a degree of curvature measured by the sensor means of the sensor-equipped speaker according to a preset condition. corresponding, the unique filter having a specific correction pattern for correcting a curved degree two selection by-option, a filter coefficient set in advance for each of the two filter selected by said selecting means is the measuring A filter synthesized speech correction unit that synthesizes at a ratio corresponding to the degree of curvature and corrects the speech signal received by the speech signal receiving unit according to the synthesized filter coefficient is corrected by the filter synthesized speech correction unit. The audio signal is output to the sensor-equipped speaker.

  With this configuration, the correction pattern can be subdivided more than the number of filters, so that the accuracy of the sound quality of the output sound is improved.

The speaker system according to claim 3, a sensor-equipped speaker and a sensor means for measuring a speaker having flexibility curving degree of the speaker in sheet form, the sound quality of the output sound of the sensor with speaker The sound quality correcting apparatus according to claim 1 or 2, wherein the sensor means is provided over a predetermined length along a surface or a peripheral portion of the speaker.

  With this configuration, it is possible to obtain a speaker system that outputs stable sound regardless of the shape when the sheet-like speaker is used.

  The speaker system according to claim 4 is the speaker system according to claim 3, wherein the speaker has a square shape in plan view, and the sensor means is provided along a lateral side of the speaker. The first sensor for measuring the degree of bending in the horizontal direction of the speaker, and the second sensor for measuring the degree of bending in the vertical direction of the speaker provided along the vertical side of the speaker. And

  With such a configuration, it is possible to obtain a speaker system that outputs a stable sound with respect to bending in two vertical and horizontal directions of a rectangular sheet-like speaker in plan view.

  According to the sound quality correction apparatus of the first aspect, by providing the sound quality correction apparatus, the sheet-like speaker can obtain output sound with stable sound quality even if the shape during use changes. According to the sound quality correction apparatus according to claim 2, output sound with more stable sound quality can be obtained.

  According to the loudspeaker system of claim 3, since it can be rounded or folded, it does not impair portability even if it is enlarged (enlarged in area), and it is a stable sound quality loudspeaker system in which the shape at the time of use is not limited. It is possible. In addition, since it is not necessary to fix the speaker to a specific shape, the place and state of use are not limited, and a support member is unnecessary if it is large enough to be used by a user. Even if it is a thing, for example, it is only necessary to hang it, and it is not necessary to fix the whole surface. According to the speaker system of the fourth aspect, a speaker system with stable sound quality can be obtained even as a speaker that is deformed in two vertical and horizontal directions.

  Hereinafter, the best mode for realizing a sound quality correction apparatus according to the present invention will be described with reference to the drawings. 1A and 1B are schematic views of a flexible display with a speaker provided with a sound quality correction apparatus according to the present invention. FIG. 1A is an external view, and FIG. 1B is a cross-sectional 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. Below, the sound quality correction | amendment apparatus concerning this invention and each element which comprises a flexible display with a speaker provided with this are demonstrated.

  As shown in FIG. 1A, the flexible display 10 with a speaker is flexible, has a rectangular sheet shape in plan view, and is connected with a video signal input cable and an audio signal input cable. Further, as shown in FIG. 1B, the configuration includes a display (display device) 2 and a speaker 3. The flexible display 10 with a speaker is provided with a bending sensor (sensor means) 4 for measuring the degree of bending.

  The display 2 is composed of an organic EL (electroluminescence), a liquid crystal, an organic TFT (thin film transistor), a composite thereof, and the like. The display 2 shown in FIG. 1B is made of an organic EL. In addition, a driving device (not shown) is also provided. In any of the methods, the substrate (transparent substrate 21 and sealing substrate 24) is made of a material such as plastic having flexibility, so that the entire apparatus has flexibility. The thickness of the display 2 is 0.1 to 0.5 mm, although it depends on the method.

  The speaker 3 is provided integrally with the display 2, drives a piezoelectric film 32 that is a film-like piezoelectric body, vibrates it, and outputs sound. Examples of the piezoelectric film 32 include polyvinylidene fluoride (PVDF). As shown in FIG. 1B, the piezoelectric film 32 is sandwiched between a pair of electrodes 33 a and 33 b so that the back side of the display 2 (the image display surface is changed). Disposed on the surface). The PVDF membrane sandwiched between the electrodes is about 0.1 mm. In addition, as long as 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.

  The bending sensor 4 includes a first sensor 41 provided along the lower side of the flexible display 10 with a speaker and a second sensor 42 provided along the left side, which are respectively in the X direction and the Y direction of the flexible display 10 with a speaker. Measure the degree of curvature. The bending sensor 4 (41, 42) may be a known one, for example, a strain gauge, which is made of a material whose electric resistance varies due to bending, and whose resistance varies according to the curvature. It is done. This has a curvature of 0 (plane) and a resistance value of about 10 kΩ, and increases to 30 to 40 kΩ when the curve is tightened (curvature is increased). That is, the bending sensor 4 is a variable resistor, and a voltage that fluctuates with respect to a constant current is output according to the curvature of the flexible display 10 with a speaker. The bending sensor 4 is configured to be provided at the periphery of the speaker 3. However, as long as the degree of curvature of the speaker 3 can be measured, the bending sensor 4 may not be provided over the entire periphery, and the speaker 3 (and the display 2). If there is no hindrance to driving and viewing, a configuration provided in the plane of the speaker 3 may be used. In addition, there is a method in which a piezoelectric body is provided separately from the piezoelectric film 32 of the speaker 3 and the change in the shape of the diaphragm is measured with the output voltage.

  As shown in FIG. 2, the sound quality correction apparatus 5 includes a receiving unit (audio signal receiving means) 6 that receives the audio signal S0 and a plurality of filters 7 (71, 72,..., 7N that correct the received audio signal S0. ) And a filter selection unit (selection means) 8 that selects 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, the edge part of the flexible display 10 with a speaker, etc. May be provided directly. The cable is a cable connected to the bending sensor 4 and the output of the sound quality correction device 5. The latter is an audio signal input cable of the flexible display 10 with a speaker. On the outside of the housing, a power ON / OFF switch, a sound quality correction function ON / OFF switch, a channel switch, a volume control knob, and the like are provided (not shown).

  The receiving unit 6 is an interface device (I / F) that receives an audio signal S0 output from the speaker 3, and may be connected to an antenna as shown in FIG. You may connect to an output terminal.

  A plurality of filters 7 are provided, and one of them is a device that receives the audio signal S0 received by the receiving unit 6 based on a command from the filter selecting unit 8, corrects the sound quality thereof, and outputs it to the speaker 3. The correction is to output the input audio signal by increasing or decreasing the amplitude or gain by a predetermined amount for each frequency band, and the details will be described later. The filter 7 is a so-called equalizer and is designed based on a known method.

  The filter selection unit 8 receives an output voltage of the bending sensor 4 and distributes the output voltage to a plurality of stages with a predetermined threshold, and a bending information processing unit 81, and a filter according to the stage. 7 stores 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 for output voltage, and a selection condition for the filter 7. And a memory 83. Therefore, the filter selection unit 8 includes an arithmetic device (CPU) and a memory.

  Next, a correction method by the sound quality correction apparatus according to the embodiment of the present invention and a detailed configuration of the sound quality correction apparatus will be described with reference to FIGS. 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 diagram showing an image for correcting the amplitude frequency characteristic of the sound.

  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 sound volume (≈amplitude) are changed. The relationship between the curvature of the speaker 3 and the sound quality of the output sound is constant, that is, the sound quality of the output sound matches if the shape (curvature) of the speaker 3 is the same. Therefore, a 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 in accordance with the shape of the speaker 3. If the signal S0 is converted and output to the loudspeaker 3, the sound of the desired sound quality is output.

  FIG. 4 is a diagram showing an image for correcting the amplitude frequency characteristic of voice, and at the same time, the amplitude frequency characteristic of FIG. 3 shows the amplitude frequency characteristic based on the original sound quality of the voice signal S0 (= 0). It is also a figure. In order to fill the difference from this reference, the sound signal S0 is corrected by a filter 7 (7A, 7B) that performs different corrections according to the two types of curvatures A, B of the speaker 3, so that either of the curvatures A, B Also in the speaker 3 of the shape, sound is output with the original sound quality. The filters 7 (71, 72,..., 7N) are set with different amplitude increase / decrease amounts (correction values). The number of filters 7 is equal to the number of sound quality correction patterns. However, the greater the number, that is, the finer the sound quality correction pattern, the more accurate the sound quality correction.

  The number of sound quality correction patterns, that is, the number of filters 7 is the number of patterns in the shape of the speaker 3 as it is. Since the change in the shape of the flexible speaker 3 is essentially infinite, the pattern of the shape is set to such an extent that the sound quality after correction does not feel uncomfortable within the range of the change in shape when the speaker 3 is used (during audio output). We will divide it into finite numbers.

  The shape of the speaker 3 is distributed into a plurality of patterns (stages) from the curvature measured by the bending sensor 4 provided at the periphery of the speaker 3. As described above, this curvature is output as an analog voltage, for example. In FIG. 1A, the bending sensor 4 (41, 42) is provided on each side of the speaker 3 (flexible display 10 with a speaker). For example, the speaker 3 is a cylinder whose axis is the Y direction. If the structure is simply rounded, only the first sensor 41 in the X direction may be provided. Furthermore, if the image display surface side is deformed only in a direction that is inward (concave surface), a unidirectional bending sensor 4 may be provided. In such a case, since the number of patterns in the shape of the speaker 3 is reduced, the number of filters 7 is reduced. On the other hand, when the curvature is different between the upper and lower sides and the left and right sides, such as a conical surface shape, it is necessary to provide the bending sensors 4 on the two opposing sides. Further, when the large speaker 3 is assumed to have a shape whose curvature varies greatly depending on the position on one side thereof, the bending sensor 4 is divided and provided. And when providing the some bending sensor 4 like these, the curvature of each bending sensor 4 is synthesize | combined and it distributes to the pattern of the shape of the speaker 3. FIG. As the method, for example, a matrix sort table is stored in the memory 83 of the filter selection unit 8. These processes are executed by the bending information processing unit 81 of the filter selection unit 8.

  Next, a correction procedure by the sound quality correction apparatus according to the embodiment of the present invention will be described with reference to FIGS. 4 and 5 and FIG. 2 as appropriate. FIG. 5 is a diagram for explaining the process of correcting the respective audio signals at the two types of curvature of the speaker.

  The sound quality correction device 5 is a filter that is set at the time of manufacture (before shipment), a threshold value for distributing the output voltage of the bending sensor 4 in stages based on the correlation between the curvature of the speaker 3 and the sound quality measured in advance, and is applied to each stage. 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 having the same shape, or may be calculated by simulation or the like.

  When the flexible display 10 with the speaker and the sound quality correction apparatus 5 are activated, the receiving unit 6 receives the audio signal S0. When receiving the audio signal S0, the receiving unit 6 instructs the filter selecting unit 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.

  Next, the filter 7A (or 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 sound signal S1a corrected by the filter 7A is output from the speaker 3 having the curvature A, an output sound having an original sound quality can be obtained. Similarly, when the sound signal S1b corrected by the filter 7B is output from the speaker 3 having the curvature B, the output sound has the same sound quality. The selection of the filter 7 is repeated every predetermined time, so that even if the shape of the flexible display 10 with speakers (speaker 3) changes during use (during sound output), the sound quality of the output sound should be satisfactory. Kept. The predetermined time for repeating the selection of the filter 7 is not particularly limited, but is preferably set according to the area of the flexible display with a speaker 10 and the application. When the shape of the flexible display 10 with the speaker is fixed, the filter 7 may be selected only when the power is turned on or when reception of the audio signal is started. In addition, although the receiving unit 6 has a format for issuing a filter 7 selection command to the filter selecting unit 8, the filter selecting unit 8 may be configured to inquire the receiving unit 6 whether or not an audio signal has been received.

  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 sound signal S <b> 0 to the speaker 3 without correction. In this case, the number of filters 7 is smaller than the number of patterns in the shape of the speaker 3. Also, instead of providing a plurality of filters 7 according to individual correction patterns, one filter 7 whose amplitude increase / decrease amount can be changed is provided, a plurality of correction patterns are stored in the memory 83 in advance, and the selection unit 82 selects the correction pattern. The filter 7 may be rewritten by selecting one of the above. In this case, since there is one filter 7, the filter switching unit 84 is unnecessary.

  Next, a correction procedure by a sound quality correction apparatus according to another embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram for explaining audio signal correction by a sound quality correction apparatus according to another embodiment of the present invention. In addition, description is abbreviate | omitted about the element which is common in the said embodiment.

  The sound quality correction apparatus 51 according to the present embodiment further includes a filter synthesis voice correction unit (filter synthesis voice correction means) 9. 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 respective correction patterns of the plurality of filters 7, the bending information processing unit 81 Then, the closest curvature A and curvature B are detected across this curvature C. Further, a ratio x (0 <x <1) where the position of the curvature C between the curvatures A−B, that is, the curvature C = x * curvature A + (1−x) * curvature B is established is calculated. From this equation, the ratio x can be calculated as x = (curvature C-curvature B) / (curvature A-curvature B), so that the bending information processing unit 81 (filter selection unit 8) performs filter synthesis on the ratio x. This is transmitted to the sound correction unit 9. On the other hand, in response to the detection result of the bending information processing unit 81, the selection unit 82 selects two filters 7: a filter 7A corresponding to the curvature A and a filter 7B corresponding to the curvature B.

  The selected filters 7A and 7B output the respective filter coefficients (amplitude increase / decrease amount for each frequency band) Ka and Kb to the filter synthesized speech correction unit 9. Based on the ratio x obtained from the filter selection unit 8, the filter synthesis speech correction unit 9 synthesizes these two filter coefficients Ka and Kb to obtain the filter coefficient Kc. That is, x * Ka + (1-x) * Kb = Kc. Then, the audio signal S0 is received from the receiving unit 6 and corrected according to the obtained filter coefficient Kc to obtain the audio signal S1c. The corrected audio signal S1c is output to the speaker 3 having the curvature C. With such a configuration, it is not necessary to provide as many filters 7 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 that should be can be reduced, and the accuracy is improved.

  With the above method, it is possible to perform sound quality correction accompanying a change in the shape of a flexible sheet-like speaker. In addition, a function that allows the user to select not to perform sound quality correction (sound quality correction OFF) may be added to the sound correction device. Further, a filter (not shown) may be separately provided on either the input side or the output side of the filter 7 and a function of increasing / decreasing the amplitude in accordance with the volume adjustment operation by the user may be added. Furthermore, another filter (not shown) may be provided, and the flexible display 10 with the speaker or the sound quality correction device 5 may be provided with a microphone so that sound quality correction corresponding to ambient noise is combined. When the sound quality correction apparatus according to the present invention is provided in a flexible display with a speaker, it may be integrated with a video apparatus (video signal receiving apparatus, image quality adjusting apparatus, etc.) that inputs a video signal to the display. Further, if a flexible display with a speaker and a sound quality correction device (and a video device) are used as a common power source, a pair of power cables is sufficient. In addition, although the speaker has been described as an apparatus integrated with a flexible display (flexible display with a speaker), the same sound quality correction can be performed with an apparatus having only a speaker.

  The speaker 3 may be configured by a diaphragm and an actuator 31 that drives the diaphragm. FIG. 7 shows a cross-sectional view of another embodiment of the flexible display with a speaker provided with the sound quality correction apparatus 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, it may be provided on the back surface side of the display 2 and the sealing substrate 24 (see FIG. 1B) of the display 2 may be driven as a vibration plate, or provided on the front surface side of the display 2 to display 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 interfere with the drive 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 a known one, and examples thereof include a piezoelectric element, and an electrodynamic actuator composed of a coil and a magnet. The configuration of the display 2 is the same as that shown in FIG.

  Although the best mode for carrying out the present invention has been described above, embodiments of the present invention will be specifically described below. In addition, this invention is not limited to this Example.

  A sound quality correction apparatus according to the present invention for a flexible television receiver is produced. First, a television receiver that is subject to sound quality correction is manufactured. The television receiver was about A4 size, and the display screen size was 297 × 210 mm. In this embodiment, the portable television receiver is assumed, and the display (and speaker) is assumed to be deformable only in the direction in which the display screen becomes concave. In other words, the display screen is rolled up and stored, and when used, the left and right sides are held with both hands, or a flat surface (or a gentle concave surface) is maintained with one part held or leaning against a wall or the like. Assumed to be configured. The display method was organic EL.

  The speaker is made of a plastic film as a substrate on the back side of the display as it is, and 12 driving devices (manufactured by Foster Electric Co., Ltd.) for notebook PC micro speakers are arranged on the left and right ends of the display as actuators. . Then, a plastic film was further bonded for sealing to complete a television receiver. The thickness of the completed television receiver was about 0.3 mm. A cable for inputting audio signals and video signals was connected to the television receiver.

  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 (manufactured by Asakusa Giken Co., Ltd.) runs along the lower side of the television receiver. One pasted. Two cables for input voltage and output voltage connected to the sound quality correction device were connected to the bending sensor.

  Next, a 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 source, and the output voltage cable was output to the voltmeter. Further, a test audio signal input device was connected to the audio signal input cable connected to the television receiver. Then, sound was output while deforming the television receiver, and the amplitude frequency characteristics of the output sound and the output voltage from the bending sensor were measured simultaneously.

  The amplitude frequency characteristics of the obtained output sound were distributed into several patterns according to the degree of 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 unitary, and the range of change is 10 to 170 cm in radius of curvature assuming the use state. did. The amplitude frequency characteristic of the output sound in the shape of this range has a variation in amplitude of ± 10 dB. Based on this result, the amplitude frequency characteristics are distributed into five patterns. The output voltage from the bending sensor that matches the distribution classification of the amplitude frequency characteristic pattern was set as a threshold value.

  Next, a filter for correcting an audio signal in accordance with each pattern of the amplitude frequency characteristic was produced. Since there are five patterns of amplitude frequency characteristics, five filters were produced. 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 are connected as shown in FIG. Thus, the sound quality correction apparatus in this example was produced.

  The output terminal (filter output) of the produced sound quality correction device is connected to the audio signal input cable of the television receiver, and the test audio signal input device is connected to the input terminal (input of the audio signal I / F) of the sound quality correction device. Connected. Then, the speaker was driven while the television receiver was deformed 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 variation in amplitude was within the range of ± 2.5 dB, and an output sound with no sense of incompatibility was obtained. Further, the maximum amplitude (maximum volume) of the output sound is 70 dBSPL or more at the minimum curvature, which is a volume that can be sufficiently heard by a person about 1 m away from the television receiver in a direction perpendicular to the display screen. .

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 a flexible display with a speaker. It is a block diagram which shows the structure of the speaker system which concerns on embodiment of this 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 curvatures of a speaker. It is a figure explaining the 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 symbols

DESCRIPTION OF SYMBOLS 1 Speaker system 10 Flexible display with a speaker 2 Display 30 Speaker with a sensor 3 Speaker 31 Actuator 32 Piezoelectric film 4 Bending sensor (sensor means)
41 1st sensor 42 2nd sensor 5,51 Sound quality correction device 6 Receiving part (voice signal receiving means)
7, 71, 72,..., 7N Filter 8 Filter selection unit (selection means)
9 Filter synthesis voice correction unit (filter synthesis voice correction means)

Claims (4)

A tone correcting apparatus for correcting sensor-attached speaker and a sensor means for measuring the degree of curvature of the speaker and the speaker having flexibility, the sound quality of the output sound in sheet form,
An audio signal receiving means for receiving an audio signal;
The audio signal received by the audio signal receiving unit is corrected so that the amplitude is increased or decreased by a predetermined amount for each frequency band, and the audio signal is output as an original sound quality sound when the speaker has a specific degree of curvature. Multiple filters, each with its own correction pattern,
One filter having a specific correction pattern for correcting with the specific degree of curvature corresponding to the degree of curvature measured by the sensor means of the sensor-equipped speaker is selected from the plurality of filters according to a preset condition. Selecting means for selecting,
A sound quality correction apparatus for outputting an audio signal corrected by the filter selected by the selection means to the sensor-equipped speaker. The selection means selects two filters having a specific correction pattern for correcting with the specific degree of curvature corresponding to the degree of curvature measured by the sensor means of the sensor-equipped speaker according to a preset condition. Select
A filter coefficient set in advance for each of the two filters selected by the selection means is synthesized at a ratio corresponding to the measured degree of curvature, and the voice signal receiving means is synthesized according to the synthesized filter coefficient. Further comprising a filter synthesized speech correcting means for correcting the speech signal received by
The sound quality correction apparatus according to claim 1, wherein the sound signal corrected by the filter synthesized sound correction unit is output to the sensor-equipped speaker. A sensor with a speaker provided with a sensor means for measuring the degree of curvature of the speaker and the speaker having flexibility in sheet form, according to claim 1 or claim 2 corrects the sound quality of the output sound of the sensor with speaker A sound quality correction device, and a speaker system comprising :
The speaker system according to claim 1, wherein the sensor means is provided over a predetermined length along a surface or a peripheral portion of the speaker. The speaker has a square shape in plan view,
The sensor means is provided along a lateral side of the speaker to measure a degree of lateral curvature of the speaker, and is provided along a longitudinal side of the speaker. The speaker system according to claim 3, comprising: a second sensor that measures a degree of bending in the vertical direction.

Images