Signal processing device, signal processing method, program, and video display device

Abstract

A signal processing device includes: a displacement detection unit for detecting the displacement amount of a video display panel based on an input audio signal, the video display panel being excited to generate sound; a threshold setting unit for calculating the displacement amount when image jitter does not occur and setting the calculated displacement amount as a threshold; and a gain adjustment unit for adjusting the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold.

Description

Technical Field

[0001] The present disclosure relates to a signal processing device, a signal processing method, a program, and a video display device. Background Art

[0002] Patent Document 1 describes a video display device configured to generate sound by vibrating a video display panel.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: WO 2018 / 123310 A Summary of the invention

[0006] Problems to be solved by the present invention

[0007] In the case where the video displayed on the video display panel is dark, etc., an object in the viewing / listening space (e.g., an object existing at a position facing the video display panel) or a viewer / listener is reflected on the video display panel. When the video display panel vibrates, there is a problem that the shaking image of the object, etc. reflected on the video display panel is visually recognized, and the viewer / listener who views / listens to the video feels uncomfortable.

[0008] An object of the present disclosure is to provide a signal processing device, a signal processing method, a program, and a video display device, which can effectively suppress the occurrence of image jitter.

[0009] Solutions to the problem

[0010] For example, the present disclosure provides a signal processing device, including:

[0011] a displacement detection unit configured to detect an amount of displacement of the video display panel that vibrates to generate sound based on an input audio signal, and

[0012] a threshold value setting unit configured to calculate a displacement amount when image shaking does not occur and set the calculated displacement amount as a threshold value; and

[0013] The gain adjustment unit is configured to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and a threshold value.

[0014] For example, the present disclosure provides a signal processing method, comprising:

[0015] causing the displacement detection unit to detect the displacement amount of the video display panel that vibrates to generate sound based on the input audio signal;

[0016] causing a threshold value setting unit to calculate a displacement amount when image shaking does not occur, and setting the calculated displacement amount as a threshold value; and

[0017] The gain adjustment unit is caused to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold value.

[0018] For example, the present disclosure provides a program that causes a computer to execute a signal processing method, the signal processing method including

[0019] causing the displacement detection unit to detect the displacement amount of the video display panel that vibrates to generate sound based on the input audio signal;

[0020] causing a threshold value setting unit to calculate a displacement amount when image shaking does not occur, and setting the calculated displacement amount as a threshold value; and

[0021] The gain adjustment unit is caused to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold value.

[0022] For example, the present disclosure provides a video display device, comprising:

[0023] Vibration Department;

[0024] a video display panel configured to display a video and generate a sound by vibrating the vibration portion; a panel displacement control unit configured to control the displacement of the video display panel; and

[0025] an amplifier configured to amplify an audio signal output from the panel displacement control unit and output the amplified audio signal to the vibration part, wherein,

[0026] The panel displacement control unit includes:

[0027] a displacement detection unit configured to detect a displacement amount of the video display panel based on an input audio signal, and

[0028] a threshold value setting unit configured to calculate a displacement amount when image shaking does not occur and set the calculated displacement amount as a threshold value; and

[0029] The gain adjustment unit is configured to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and a threshold value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A to Figure 1 C is a figure referred to when describing the outline of the embodiment.

[0031] Figure 2 It is a figure referred to when describing the outline of the embodiment.

[0032] Figure 3 is a perspective view of a video display device according to an embodiment.

[0033] Figure 4 is a rear view of the video display device according to the embodiment.

[0034] Figure 5 is a block diagram including an internal configuration of a video display device according to an embodiment.

[0035] Figure 6 is a diagram referred to in describing the dynamic EQ according to the embodiment.

[0036] Figure 7 : is a diagram referred to in describing a specific example of the dynamic EQ according to the embodiment.

[0037] Figure 8 : is a diagram referred to in describing another specific example of the dynamic EQ according to the embodiment.

[0038] Fig. 9 is a flowchart showing a flow of processing performed by a panel displacement control unit according to an embodiment.

[0039] Fig.10 is a diagram for describing an attack time, a hold time, and a release time according to an embodiment.

[0040] Fig.11 is a diagram used to describe the variant. DETAILED DESCRIPTION

[0041] Embodiments and the like of the present disclosure will be described in the following order.

[0042] <Overview of Embodiment>

[0043] <Example>

[0044] <Variation>

[0045] The embodiments and the like described below are preferred specific examples of the present disclosure, and the contents of the present disclosure are not limited to the implementation examples.

[0046] <Overview of Embodiment>

[0047] Figure 1 A to Figure 1 'C' is a figure referred to when describing the outline of this embodiment. In this embodiment, a system is described in which a video display panel is vibrated by a vibrating unit such as an actuator. By irradiating the video display panel with laser light or the like, the displacement characteristics of the video display panel can be measured in advance. Figure 1 A is a graph showing an example of displacement characteristics of a video display panel. Figure 1A shows the frequency characteristics of the displacement (mm) generated when an audio signal having a constant input voltage is input to the vibration part to vibrate the video display panel as the displacement characteristics. Figure 1 As shown in A, the lower the frequency, the larger the displacement amount. In addition, a threshold value indicating whether image shaking occurs is set, and when the displacement amount of the video display panel exceeds the threshold value, the image shaking becomes obvious so that the image shaking is visually recognized.

[0048] As a solution to effectively suppress image jitter, it is conceivable to use a Figure 1 The characteristic high-pass filter method is schematically shown in B. By using a high-pass filter to cut off the low-frequency components, such as Figure 1 As shown in C, the displacement of the video display panel can be prevented from exceeding the threshold value, and image jitter can be effectively suppressed. However, since the low frequency is always cut off by a fixed high-pass filter in this method, there is a possibility that the signal of the low-frequency component that does not exceed the threshold value is also cut off. In addition, it is conceivable to use a subwoofer to reproduce the low-frequency component of the audio signal in combination, but due to the increased cutoff frequency, there is a possibility that the panel's reproduction of the sound and the sound pressure around the crossover frequency of the subwoofer are reduced. Therefore, while effectively suppressing image jitter, it is expected to ensure the sound pressure of the signal of the low-frequency component.

[0049] Meanwhile, even if the same displacement amount of the video display panel is used, the degree of noticeability of the image jitter varies depending on the characteristics of the video input to the video display panel, the illumination of the space where the video display panel is located, specifications (such as the reflectivity of the video display panel), the viewing / listening position, etc. Therefore, it is preferable to dynamically change the threshold indicating whether the image jitter occurs according to the above factors.

[0050] Therefore, in this embodiment, a threshold indicating whether image shaking occurs is appropriately set. Figure 2 As shown, when the displacement of the video display panel exceeds the threshold, the level of the audio signal is reduced. As described above, the lower the frequency of the audio signal, the greater the displacement of the video display panel, so that the level of the low-frequency component of the audio signal is mainly attenuated. As a result, the vibration of the video display panel can be suppressed, thereby suppressing the occurrence of image jitter.

[0051] <Example>

[0052] [Configuration example of video display device]

[0053] Figure 3 and Figure 4 1 is a diagram for explaining a configuration example of a video display device (video display device 1 ) according to the present embodiment. Figure 3is a perspective view of the video display device 1 as viewed from the back side (the surface opposite to the surface on which the video is displayed), Figure 4 1 is a plan view of the video display device 1 viewed from the rear. The video display device 1 includes a panel portion 2 , a support portion 3 , and a storage portion 4 .

[0054] The panel unit 2 is a video display panel for displaying video. Figure 4 As shown, the panel unit 2 according to the present embodiment has a configuration in which two panel units (panel unit 2A, panel unit 2B) are integrated. Needless to say, the panel unit 2 may include one panel unit or three or more panel units. An organic light emitting diode (OLED), a liquid crystal display (LCD), etc. may be applied to the panel unit 2.

[0055] The support portion 3 is attached to the back surface of the panel portion 2 and supports the panel portion 2. In addition, the support portion 3 may also be attached to the back surface of the panel portion 2 via a rotating portion such as a hinge. The tilt angle of the panel portion 2 can be adjusted by rotating the rotating portion to move the support portion 3. Note that in the present embodiment, the support portion 3 is used as a speaker of a subwoofer.

[0056] The storage unit 4 is, for example, in the shape of a rod and is mounted on the back side of the panel unit 2. The storage unit 4 stores the vibration unit 5 that causes the panel unit 2 to vibrate, a control circuit that provides an audio signal to the vibration unit 5 (for example, a panel displacement control unit described later), and the like. The vibration unit 5 stored in the storage unit 4 includes, for example, two vibrators (vibrator 5A and vibrator 5B). The vibrator 5A and the vibrator 5B are, for example, piezoelectric actuators. Each of the two vibrators 5A and 5B is mounted near the center of the back side of the corresponding panel unit. Specifically, the vibrator 5A is mounted near the center of the back side of the panel unit 2A, and the vibrator 5B is mounted near the center of the back side of the panel unit 2B (see Figure 4 ). Note that multiple vibrators controlled in the same manner may be mounted near the center of the back side of each panel portion.

[0057] [Internal configuration example of video display device]

[0058] Figure 5 1 is a block diagram showing a configuration including an internal configuration of the video display device 1. A video signal and an audio signal are input to the video display device 1 as source signals. The video signal and the audio signal are input to the video display device 1 via broadcasting, a network such as the Internet, from a hard disk, a suitable storage such as an optical disk or a universal serial bus (USB) storage, etc. Note that in Figure 5 The configuration for processing the video signal is omitted. The video signal input to the video display device 1 is processed by a known video processing circuit, and then provided to the panel unit 2 and displayed on the panel unit.

[0059] Video display device 1 includes volume adjustment unit 10, panel displacement control unit 20 and amplifier 30. Note that, as in the present embodiment, in the case where vibration section 5 includes two vibrators 5A and 5B, volume adjustment unit 10, panel displacement control unit 20 and amplifier 30 are set for each vibrator.

[0060] The panel displacement control unit 20 is connected to the output side of the volume adjustment unit 10. The amplifier 30 is connected to the output side of the panel displacement control unit 20. The vibration part 5 described above is connected to the output side of the amplifier 30.

[0061] The volume adjustment unit 10 adjusts the volume so that the level of the input audio signal reaches a level corresponding to the set volume. The audio signal adjusted by the volume adjustment unit 10 is output to the panel displacement control unit 20.

[0062] Schematically, the panel displacement control unit 20 adjusts the low frequency level of the input audio signal provided from the volume adjustment unit 10 based on the control gain. The input audio signal having the adjusted low frequency level is output from the panel displacement control unit 20 to the amplifier 30. Note that the low frequency band refers to a frequency band having a frequency lower than a predetermined threshold value, and is, for example, about 20 Hz to 200 Hz.

[0063] The amplifier 30 amplifies the audio signal supplied from the panel displacement control unit 20 at a predetermined amplification factor. The audio signal amplified by the amplifier 30 is supplied to the oscillation section 5. The vibration section 5 vibrates based on the audio signal supplied from the amplifier 30, and then the panel section 2 vibrates due to the vibration of the vibration section 5. The viewer / listener of the video display device 1 hears the sound generated by the vibration of the panel section 2.

[0064] (Details of the panel displacement control unit)

[0065] The panel displacement control unit 20 includes, for example, an image shake detection unit 201 as an example of a threshold value setting unit, a panel displacement detection unit 202 as an example of a displacement detection unit, a control gain calculation unit 203, a delay unit 204, and a dynamic equalizer (EQ) 205 as an example of a gain adjustment unit. A video signal is supplied as an input video signal to the image shake detection unit 201. An audio signal supplied from the volume adjustment unit 10 is supplied as an input audio signal to each of the panel displacement detection unit 202 and the delay unit 204.

[0066] The image jitter detection unit 201 calculates the displacement amount when image jitter does not occur, and sets the calculated displacement amount as a threshold value. For example, the image jitter detection unit 201 calculates the displacement amount based on the characteristics of the input video signal input to the image jitter detection unit 201. Specifically, the characteristics of the input video signal are characteristics related to the illuminance of the input video signal. More specifically, the characteristics related to the illuminance of the input video signal include an illuminance average value obtained by averaging the illuminance of each pixel in the frame constituting the input video signal. The image jitter detection unit 201 provides the calculated threshold value to the control gain calculation unit 203.

[0067] In the case where the illuminance of the input video signal is small (i.e., in the case where the input video signal is a dark image as a whole), there is a high possibility that reflection occurs on the panel section 2 and image jitter of reflection vibration occurs. Therefore, in the case where the illuminance of the input video signal is small, the image jitter detection unit 201 reduces the threshold value. Although the details will be described later, by reducing the threshold value, the level of the low-frequency component of the audio signal is attenuated, so that the vibration of the panel section 2 is suppressed. As a result, the occurrence of image jitter can be effectively suppressed.

[0068] On the other hand, when the illuminance of the input video signal is large (i.e., when the input video signal is a bright image as a whole), no reflection occurs on the panel unit 2 or the reflection is not obvious, so that the possibility of image jitter is low. Therefore, when the illuminance of the input video signal is large, the image jitter detection unit 201 increases the threshold. By setting the increased threshold, the level of the low-frequency component of the input audio signal is maintained without being attenuated, or the attenuation amount is reduced. Thus, the sound pressure can be ensured.

[0069] For example, a threshold value corresponding to the illumination average value is set in advance as follows. In a state where a certain number of objects are being watched / listened to, a video signal having a predetermined illumination average value is input, and the panel unit 2 is vibrated while changing the displacement amount. The displacement amount at which the number of objects visually recognizing image jitter is greater than or equal to the predetermined number is set as the threshold value corresponding to the illumination average value. A table, arithmetic expression, etc. in which the illumination average value and the threshold value are associated with each other is stored in a suitable memory as a characteristic of the panel unit 2. The image jitter detection unit 201 calculates the illumination average value of the input video signal, and then calculates the threshold value when image jitter does not occur based on the calculated illumination average value and the characteristics of the panel unit 2 measured in advance. Note that the displacement amount when image jitter does not occur can be a displacement amount at which the number of objects visually recognizing image jitter is zero, or a displacement amount at which the number of objects visually recognizing image jitter is less than or equal to a specific number.

[0070] The panel displacement detection unit 202 detects the displacement amount of the panel portion 2 vibrated by the vibration portion 5 to generate sound based on the input audio signal provided from the volume adjustment unit 10. The panel displacement detection unit 202 includes a filter (e.g., a second-order infinite impulse response (IIR) low-pass filter (LPF)) that approximates the displacement characteristics of the panel portion 2 measured in advance. The panel displacement detection unit 202 performs filtering processing on the input audio signal to detect the displacement amount of the panel portion 2 relative to the input audio signal.

[0071] The control gain calculation unit 203 compares the threshold value provided from the image jitter detection unit 201 with the displacement amount detected by the panel displacement detection unit 202 to calculate the control gain based on the comparison result. The control gain is a parameter indicating the degree to which the level of the low-frequency component of the audio signal is reduced. The low-frequency band is a preset frequency band. As described above, since the displacement amount of the panel portion 2 becomes larger as the audio signal is in a lower frequency band, the displacement amount of the panel portion 2 can be reduced by attenuating the level of the low-frequency component of the audio signal using the control gain.

[0072] The control gain calculation unit 203 calculates a control gain corresponding to the amount by which the displacement amount detected by the panel displacement detection unit 202 exceeds the threshold value. Specifically, the control gain calculation unit 203 calculates a control gain (-3dB, -6dB, etc.) in which the attenuation amount of the low-frequency component of the input audio signal increases as the displacement amount detected by the panel displacement detection unit 202 exceeds the threshold value. In the case where the displacement amount detected by the panel displacement detection unit 202 does not exceed the threshold value, the control gain calculation unit 203 outputs 0dB (decibel) as the control gain. When the control gain is 0dB (i.e., once), this means that the audio signal is output as it is without reducing the level of the low-frequency component.

[0073] The delay unit 204 delays the input audio signal during the process of calculating the control gain by the control gain calculation unit 203. The input audio signal delayed by the delay unit 204 is supplied to the dynamic EQ 205.

[0074] like Figure 6 As schematically shown in FIG. 2 , the dynamic EQ 205 adjusts the level of the low frequency component of the input audio signal based on the control gain. The audio signal processed by the dynamic EQ 205 is then output to the amplifier 30. As the dynamic EQ 205, a shelving filter or a parametric equalizer may be applied. Figure 7 2 shows the frequency characteristics in the case where a shelving filter is applied as the dynamic EQ 205. In addition, Figure 8 The frequency characteristics in the case where a parametric filter is used as the dynamic EQ 205 are shown. Figure 7 and Figure 8The arrow in indicates that the control gain changes according to the calculation result of the control gain calculation unit 203. Note that Figure 6 An example of applying a shelving filter as the dynamic EQ 205 is shown.

[0075] [Operation example of panel displacement control unit]

[0076] Fig. 9 : is a flowchart showing the flow of processing performed by the panel displacement control unit 20 according to the present embodiment.

[0077] After the process starts, in step ST1, the image shake detection unit 201 calculates and sets a threshold value based on the characteristics of the input video signal. Then, the process proceeds to step ST2.

[0078] In step ST2, the panel displacement detecting unit 202 performs filter processing on the input audio signal to calculate the displacement amount of the panel section 2 with respect to the input audio signal. Then, the process proceeds to step ST3.

[0079] In step ST3, the control gain calculation unit 203 compares the threshold value set in step ST1 with the displacement amount of the panel portion 2 calculated in step ST2. As a result of the comparison, in the case where the displacement amount of the panel portion 2 is greater than the threshold value (determined as YES), the control gain calculation unit 203 calculates a control gain corresponding to the amount by which the displacement amount of the panel portion 2 exceeds the threshold value so that the displacement amount of the panel portion 2 falls below the threshold value. The control gain calculation unit 203 provides the calculated control gain to the dynamic EQ 205. Then, the process proceeds to step ST4.

[0080] In step ST4, the dynamic EQ 205 attenuates the level of the low frequency component of the input audio signal using the control gain. As a result, the vibration of the panel section 2 can be suppressed, and the occurrence of image shake can be suppressed. Then, the process ends.

[0081] As a result of the comparison in the process of step ST3, in the case where the displacement amount of the panel section 2 is less than or equal to the threshold value (determined as no), the level of the low-frequency component of the input audio signal is output without attenuation. For example, the control gain calculation unit 203 sets 0dB as the control gain. The dynamic EQ 205 adjusts the level of the input audio signal with the set control gain (0dB), that is, outputs the input audio signal without changing its level. Note that a loop connected from the delay unit 204 to the amplifier 30 without passing through the dynamic EQ 205 may be provided, and in the case where the displacement amount of the panel section 2 is equal to or less than the threshold value (determined as no), the input audio signal may pass through the loop. The above process is repeated as appropriate.

[0082] Note that the attack time, hold time, and release time can be set in the control gain. Assume, for example, that -3dB is calculated as the control gain. Fig.10 As shown, the start-up time is the time period for the control gain to gradually change from 0dB to -3dB ( Fig.10 The hold time is the time period during which the control gain is maintained at -3dB ( Fig.10 The release time is the time taken for the control gain to return to 0 dB after the control gain no longer needs to be -3 dB ( Fig.10 The time period from t3 to t4 in FIG.

[0083] As described above, in the present embodiment, processing is performed by the dynamic EQ 205 while the control gain is changed based on the attack time and the release time. Note that in the case where -3 dB is calculated again as the control gain while the control gain is changed during the release time, processing of gradually changing the control gain is performed at that timing so that the control gain is -3 dB.

[0084] When the level of the low-frequency component of the input audio signal decays rapidly, the audience / listener may feel uncomfortable from an auditory point of view. By appropriately setting the rise time, hold time, and release time, the level of the low-frequency component of the input audio signal can be prevented from decaying rapidly. In addition, human hearing is insensitive to a decrease in sound pressure, but is sensitive to an increase in sound pressure. Taking such auditory characteristics into consideration, in this embodiment, by setting the start time to be short, the level of the low-frequency component of the input audio signal is decayed rapidly, thereby preventing the occurrence of image jitter. In addition, by setting the release time to be longer than the start time, the level of the low-frequency component of the input audio signal gradually increases. As a result, the audience / listener can be prevented from feeling uncomfortable due to changes in the level of the low-frequency component of the input audio signal while suppressing the occurrence of image jitter.

[0085] According to the present embodiment described above, the image shake detection unit 201 suppresses the displacement amount of the panel unit 2 based on the characteristics of the input video signal. Therefore, in the case where the characteristics of the input video signal may cause image shake, the occurrence of image shake can be effectively suppressed by lowering the threshold to suppress the vibration of the panel unit 2. On the other hand, in the case where the characteristics of the input video signal hardly cause image shake, the level of the low-frequency component of the input audio signal is not attenuated, so that the sound pressure can be ensured.

[0086] <Variation>

[0087] The embodiments of the present invention are described in detail above, but the content of the present invention is not limited to the above embodiments, and various modifications can be made based on the technical concept of the present invention.

[0088] In the above-described embodiment, the image jitter detection unit 201 calculates the displacement amount based on the characteristics related to the illumination of the input video signal, and sets the displacement amount as a threshold value. However, the present disclosure is not limited thereto. The ease with which image jitter occurs varies not only due to the different illumination of the input video signal, but also due to the illumination of the viewing / listening space, the viewing / listening position, the reflectivity of the panel unit 2, and the like. For example, the brighter the viewing / listening space, the more likely reflection and image jitter will occur. Therefore, in the case where the viewing / listening space is bright, the threshold value is set to be small. In addition, the closer the viewing / listening position is to the front of the panel unit 2, the easier the image jitter is to be recognized. Therefore, the closer the viewing / listening position is to the front of the panel unit 2, the smaller the threshold value is set. In addition, the higher the reflectivity of the panel unit 2, the greater the possibility of reflection and image jitter. Therefore, in the case where the reflectivity of the panel unit 2 is high, even in the case where the illumination of the input video signal is large or in the case where the viewing / listening space is dark, the calculated threshold value is corrected to be reduced to a certain extent.

[0089] For example, Fig.11 As shown, an illuminance sensor 40 that detects the illuminance of the viewing / listening space may be provided, and sensing data indicating the illuminance of the viewing / listening space may be provided from the illuminance sensor 40 to the image shake detection unit 201. Then, the image shake detection unit 201 may calculate a threshold value by referring to the sensing data provided from the illuminance sensor 40. The illuminance sensor 40 may be a sensor that detects a viewing / listening position, specifically, a known sensor that detects a viewer / listener (person). In addition, the image shake detection unit 201 may correct a threshold value calculated based on pre-stored specification information (panel size, reflectivity, etc.) of the panel section 2. In addition, the image shake detection unit 201 may set a threshold value by appropriately combining the above methods.

[0090] The characteristic related to the illuminance of the input video signal may include a value other than the illuminance average value. One frame may be divided into, for example, four blocks, and the characteristic related to the illuminance of the input video signal may be determined for each block. The processing unit of the image jitter detection unit 201 may be appropriately set, for example, in units of frames, in units of several frames, etc. Similarly, the processing unit of the input audio signal may also be appropriately set, such as in units of samples, in units of frames, etc.

[0091] The volume adjustment unit 10 may be provided at a subsequent stage of the panel displacement control unit 20. In this case, the volume adjustment unit 10 may be configured so that the volume information set in the volume adjustment unit 10 is provided to the panel displacement detection unit 202. The panel displacement detection unit 202 may perform filtering processing according to the volume information.

[0092] In the processing flow described in this embodiment, the order of some processes may be changed, or some processes may be executed in parallel.

[0093] The present disclosure may also be implemented by devices, methods, programs, systems, etc. For example, a program that performs the functions described in the above embodiments may be downloaded, and a device that does not have the functions described in the embodiments downloads and installs the program, so that the control described in the embodiments may be performed in the device. The present disclosure may also be implemented by a server that distributes such a program. In addition, the contents described in the various embodiments and variations may be appropriately combined. Furthermore, the contents of the present disclosure should not be interpreted as being limited by the effects of the examples in this specification.

[0094] The present disclosure may also adopt the following configurations. (1)

[0096] A signal processing device, comprising:

[0097] a displacement detection unit configured to detect an amount of displacement of a video display panel that vibrates to generate sound based on an input audio signal, and

[0098] a threshold value setting unit configured to calculate a displacement amount when image shaking does not occur and set the calculated displacement amount as a threshold value; and

[0099] The gain adjustment unit is configured to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and a threshold value. (2)

[0101] The signal processing device according to (1), further comprising:

[0102] a control gain calculation unit configured to calculate a control gain based on a comparison result between the displacement amount detected by the displacement detection unit and a threshold value, wherein

[0103] The gain adjustment unit adjusts the level of the input audio signal using the control gain. (3)

[0105] The signal processing device according to (1) or (2), wherein:

[0106] The gain adjustment unit changes the gain from 0 dB to the control gain during a predetermined attack time, and changes the gain from the control gain to 0 dB during a predetermined release time. (4)

[0108] The signal processing device according to (3), wherein

[0109] Set the attack time to a value smaller than the release time. (5)

[0111] The signal processing device according to any one of (1) to (4), wherein:

[0112] The displacement detection unit includes a filter that approximates a displacement characteristic of a video display panel, the displacement characteristic being measured in advance. (6)

[0114] The signal processing device according to (2), wherein

[0115] The gain adjustment unit adjusts the level of the input audio signal using the control gain so as not to allow the displacement amount to exceed a threshold value. (7)

[0117] The signal processing device according to any one of (1) to (4), wherein:

[0118] The threshold setting unit calculates the displacement amount based on the characteristics of the input video signal. (8)

[0120] The signal processing device according to (7), wherein

[0121] The threshold setting unit calculates the displacement amount based on the illuminance-related characteristics of the input video signal. (9)

[0123] The signal processing device according to (7) or (8), wherein:

[0124] The threshold setting unit calculates the displacement amount based on the sensing data provided from the sensor. (10)

[0126] The signal processing device according to (9), wherein

[0127] The sensor includes at least one of an illumination sensor and a sensor for detecting audience / listeners. (11)

[0129] The signal processing device according to (9) or (10), wherein:

[0130] The threshold setting unit calculates the displacement amount based on specification information of the video display panel. (12)

[0132] A signal processing method, comprising:

[0133] causing a displacement detection unit to detect a displacement amount of a video display panel based on an input audio signal, the video display panel vibrating to generate a sound;

[0134] causing a threshold value setting unit to calculate a displacement amount when image shaking does not occur, and setting the calculated displacement amount as a threshold value; and

[0135] The gain adjustment unit is caused to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold value. (13)

[0137] A program causes a computer to execute a signal processing method, the signal processing method comprising:

[0138] causing a displacement detection unit to detect a displacement amount of a video display panel based on an input audio signal, the video display panel vibrating to generate a sound;

[0139] causing a threshold value setting unit to calculate a displacement amount when image shaking does not occur, and to set the calculated displacement amount as a threshold value; and

[0140] The gain adjustment unit is caused to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold value. (14)

[0142] A video display device, comprising:

[0143] Vibration Department;

[0144] A video display panel configured to display a video and generate a sound by vibrating the vibration portion;

[0145] a panel displacement control unit configured to control the displacement of the video display panel; and

[0146] an amplifier configured to amplify an audio signal output from the panel displacement control unit and output the amplified audio signal to the vibration part, wherein,

[0147] The panel displacement control unit includes:

[0148] a displacement detection unit configured to detect a displacement amount of the video display panel based on an input audio signal, and

[0149] a threshold value setting unit configured to calculate a displacement amount when image shaking does not occur and set the calculated displacement amount as a threshold value; and

[0150] The gain adjustment unit is configured to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and a threshold value.

[0151] Reference Symbols List

[0152] 1Video display device

[0153] 2. Panel

[0154] 5. Vibration part

[0155] 5A, 5B vibrator

[0156] 20 Panel displacement control unit

[0157] 30 Amplifier

[0158] 201 Image jitter detection unit

[0159] 202 panel displacement detection unit

[0160] 203 control gain calculation unit

[0161] 205 Dynamic EQ.

Claims

1. A signal processing device, comprising: a displacement detection unit configured to detect a displacement amount of a video display panel based on an input audio signal, the video display panel vibrating to generate sound, a threshold setting unit configured to calculate a displacement amount when image jitter does not occur, and set the calculated displacement amount as a threshold; as well as The gain adjustment unit is configured to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold value.

2. The signal processing device according to claim 1, further comprising: a control gain calculation unit configured to calculate a control gain based on the comparison result between the displacement amount detected by the displacement detection unit and the threshold value, wherein: The gain adjustment unit adjusts the level of the input audio signal using the control gain.

3. The signal processing device according to claim 2, wherein: The gain adjustment unit changes the gain from 0 dB to the control gain during a predetermined attack time, and changes the gain from the control gain to 0 dB during a predetermined release time.

4. The signal processing device according to claim 3, wherein: The value of the attack time is set to be smaller than the value of the release time.

5. The signal processing device according to claim 1, wherein: The displacement detection unit includes a filter that approximates a displacement characteristic of the video display panel, the displacement characteristic being measured in advance.

6. The signal processing device according to claim 2, wherein: The gain adjustment unit adjusts the level of the input audio signal using the control gain so as not to allow the displacement amount to exceed the threshold value.

7. The signal processing device according to claim 1, wherein: The threshold setting unit calculates the displacement amount based on characteristics of an input video signal.

8. The signal processing device according to claim 7, wherein: The threshold setting unit calculates the displacement amount based on a characteristic related to illumination of the input video signal.

9. The signal processing device according to claim 7, wherein: The threshold setting unit calculates the displacement amount based on sensing data provided from a sensor.

10. The signal processing device according to claim 9, wherein: The sensor includes at least one of an illumination sensor and a sensor for detecting an audience / listener.

11. The signal processing device according to claim 9, wherein: The threshold setting unit calculates the displacement amount based on specification information of the video display panel.

12. A signal processing method, comprising: causing a displacement detection unit to detect a displacement amount of a video display panel based on an input audio signal, the video display panel vibrating to generate sound, causing a threshold setting unit to calculate a displacement amount when image shaking does not occur, and setting the calculated displacement amount as a threshold; and The gain adjustment unit is caused to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold value.

13. A computer-readable storage medium having a program stored thereon, wherein when the program is executed by a computer, the computer is caused to perform a signal processing method, the signal processing method comprising: causing a displacement detection unit to detect a displacement amount of a video display panel based on an input audio signal, the video display panel vibrating to generate sound, causing a threshold setting unit to calculate a displacement amount when image shaking does not occur, and setting the calculated displacement amount as a threshold; and The gain adjustment unit is caused to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold value.

14. A video display device, comprising: Vibration Department; a video display panel configured to display a video and generate a sound by vibrating the vibration portion; a panel displacement control unit configured to control the displacement of the video display panel; as well as an amplifier configured to amplify the audio signal output from the panel displacement control unit and output the amplified audio signal to the vibration part, wherein, The panel displacement control unit comprises: a displacement detection unit configured to detect the displacement amount of the video display panel based on an input audio signal, a threshold value setting unit configured to calculate a displacement amount when image shaking does not occur and set the calculated displacement amount as a threshold value; and The gain adjustment unit is configured to adjust the level of the input audio signal based on a comparison result between the displacement amount detected by the displacement detection unit and the threshold value.

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