阅读说明：本技术 信号处理设备、信号处理方法、程序和视频显示设备 (Signal processing device, signal processing method, program, and video display device ) 是由 黑田善之 米田道昭 于 2020-03-30 设计创作，主要内容包括：一种信号处理设备,包括：位移检测单元,用于基于输入音频信号来检测视频显示面板的位移量,该视频显示面板被激发以产生声音；阈值设定单元,用于计算图像抖动未发生时的位移量,并将所计算的位移量设定为阈值；以及增益调节单元,用于基于由位移检测单元所检测的位移量与阈值之间的比较结果来调节输入音频信号的电平。(A signal processing apparatus comprising: a displacement detecting unit for detecting a displacement amount of a video display panel, which is excited to generate a sound, based on an input audio signal; a threshold value setting unit for calculating a displacement amount when image shake does not occur, and setting the calculated displacement amount as a threshold value; and a gain adjustment unit for adjusting a 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.)

1. A signal processing apparatus 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 a sound,

a threshold setting unit configured to calculate a displacement amount when image shake does not occur, and set the calculated displacement amount as a threshold; and

a gain adjustment unit configured to adjust a 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 apparatus of claim 1, further comprising:

a control gain calculation unit configured to calculate a control gain based on the comparison result between the amount of displacement 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 apparatus according to claim 2,

the gain adjustment unit changes the gain from 0dB to the control gain during a predetermined start time and changes the gain from the control gain to 0dB during a predetermined release time.

4. The signal processing apparatus according to claim 3,

the value of the activation time is set to a value less than the release time.

5. The signal processing apparatus according to claim 1,

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 apparatus according to claim 2,

the gain adjustment unit adjusts the level of the input audio signal using the control gain so as not to allow the amount of displacement to exceed the threshold.

7. The signal processing apparatus according to claim 1,

the threshold setting unit calculates the displacement amount based on a characteristic of an input video signal.

8. The signal processing apparatus according to claim 7,

the threshold setting unit calculates the displacement amount based on a luminance-related characteristic of the input video signal.

9. The signal processing apparatus according to claim 7,

the threshold setting unit calculates the amount of displacement based on sensing data supplied from a sensor.

10. The signal processing apparatus according to claim 9,

the sensor includes at least one of an illuminance sensor and a sensor to detect a viewer/listener.

11. The signal processing apparatus according to claim 9,

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 detecting 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,

causing a threshold value setting unit to calculate a displacement amount when image shake does not occur, and setting the calculated displacement amount as a threshold value; and is

Causing a gain adjustment unit to adjust a level of the input audio signal based on a result of comparison between the amount of displacement detected by the displacement detection unit and the threshold value.

13. A program for causing a computer to execute a signal processing method comprising:

causing a displacement detecting 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,

causing a threshold value setting unit to calculate a displacement amount when image shake does not occur, and setting the calculated displacement amount as a threshold value; and is

Causing a gain adjustment unit to adjust a level of the input audio signal based on a result of comparison between the amount of displacement detected by the displacement detection unit and the threshold value.

14. A video display device comprising:

a vibrating section;

a video display panel configured to display a video and to generate a sound by being vibrated by the vibration section;

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

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 includes:

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

a threshold setting unit configured to calculate a displacement amount when image shake does not occur, and set the calculated displacement amount as a threshold; and

a gain adjustment unit configured to adjust a 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.

Technical Field

The present disclosure relates to a signal processing device, a signal processing method, a program, and a video display device.

Background

Patent document 1 describes a video display device configured to generate sound by vibrating a video display panel.

Documents of the prior art

Patent document

Patent document 1: WO 2018/123310A

Disclosure of Invention

Problems to be solved by the invention

In a case where video displayed on the video display panel is dark or the like, an object in the viewing/listening space (for example, 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 are problems as follows: the jittered image jitter of the object or the like reflected on the video display panel is visually recognized, and the viewer/listener who views/listens to the video feels uncomfortable.

An object of the present disclosure is to provide a signal processing device, a signal processing method, a program, and a video display device capable of effectively suppressing the occurrence of image shaking.

Means for solving the problems

For example, the present disclosure provides a signal processing apparatus comprising:

a displacement detection unit configured to detect a displacement amount of the video display panel vibrating to generate sound based on the input audio signal, an

A threshold setting unit configured to calculate a displacement amount when image shake does not occur, and set the calculated displacement amount as a threshold; and

a gain adjustment unit configured to adjust a 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.

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

a displacement amount of the video display panel that causes the displacement detection unit to detect vibration based on the input audio signal to generate sound;

causing a threshold value setting unit to calculate a displacement amount when image shake does not occur, and setting the calculated displacement amount as a threshold value; and is

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

For example, the present disclosure provides a program causing a computer to execute a signal processing method including

A displacement amount of the video display panel that causes the displacement detection unit to detect vibration based on the input audio signal to generate sound;

causing a threshold value setting unit to calculate a displacement amount when image shake does not occur, and setting the calculated displacement amount as a threshold value; and is

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

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

a vibrating section;

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

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 includes:

a displacement detecting unit configured to detect a displacement amount of the video display panel based on the input audio signal, an

A threshold setting unit configured to calculate a displacement amount when image shake does not occur, and set the calculated displacement amount as a threshold; and

a gain adjustment unit configured to adjust a 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.

Drawings

Fig. 1 a to 1C are diagrams referred to in describing an outline of the embodiment.

Fig. 2 is a diagram referred to in describing an outline of the embodiment.

Fig. 3 is a perspective view of a video display device according to an embodiment.

Fig. 4 is a rear view of a video display device according to an embodiment.

Fig. 5 is a block diagram including an internal configuration of a video display device according to the embodiment.

Fig. 6 is a diagram describing a reference when the EQ is dynamic according to the embodiment.

Fig. 7 is a diagram referred to when describing a specific example of the dynamic EQ according to the embodiment.

Fig. 8 is a diagram referred to when describing another specific example of the dynamic EQ according to the embodiment.

Fig. 9 is a flowchart illustrating a flow of processing performed by the panel displacement control unit according to the embodiment.

Fig. 10 is a diagram for describing the start time, hold time, and release time according to the embodiment.

Fig. 11 is a diagram for describing a modification.

Detailed Description

The embodiments and the like of the present disclosure will be described in the following order.

< overview of the examples >

< example >

< modification >

The examples and the like described below are preferred specific examples of the present disclosure, and the content of the present disclosure is not limited to the embodiments.

< overview of the examples >

Fig. 1 a to 1C are diagrams referred to in describing an outline of the present embodiment. In the present embodiment, description is made with respect to a system in which a video display panel is vibrated by a vibrating portion such as an actuator. The displacement characteristics of the video display panel can be measured in advance by irradiating the video display panel with laser light or the like. A of fig. 1 is a diagram showing an example of displacement characteristics of the video display panel. A of fig. 1 shows, as the displacement characteristic, a frequency characteristic of displacement (mm) generated in a case where an audio signal having a constant input voltage is input to the vibration portion to vibrate the video display panel. As shown in a of fig. 1, the lower the frequency, the larger the displacement amount. Further, a threshold value indicating whether or not image shake occurs is set, and when the amount of displacement of the video display panel exceeds the threshold value, the image shake becomes conspicuous so that the image shake is visually recognized.

As a solution to effectively suppress image shake, a method using a high-pass filter having a characteristic schematically shown in B of fig. 1 is conceivable. By cutting off the low-frequency component using the high-pass filter, as shown in C of fig. 1, the displacement amount of the video display panel can be prevented from exceeding the threshold value, and image shake can be effectively suppressed. However, since low frequencies are always cut off by a fixed high-pass filter in this method, there is a possibility that signals of low-frequency components not exceeding a threshold are also cut off. Further, it is conceivable to reproduce low-frequency components of an audio signal in combination using subwoofers, but due to the increased cutoff frequency, there is a possibility that the reproduction of sound by the panel and the sound pressure around the crossover frequency of the subwoofer are lowered. Therefore, it is desirable to secure the sound pressure of the signal of the low frequency component while effectively suppressing the image shake.

Meanwhile, even if the same displacement amount of the video display panel is used, the degree of saliency of image shake varies depending on the characteristics of video input to the video display panel, the illuminance of the space where the video display panel is located, specifications (such as the reflectance of the video display panel), the viewing/listening position, and the like. Therefore, it is preferable to dynamically change the threshold value indicating whether image shake occurs or not according to the above-described factors.

Therefore, the threshold value indicating whether or not image shake occurs is appropriately set in the present embodiment. Further, as shown in fig. 2, in the case where the displacement amount of the video display panel exceeds the threshold value, the level of the audio signal is lowered. As described above, the lower the frequency of the audio signal, the greater the displacement amount 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, so that the occurrence of image shake can be suppressed.

< example >

[ configuration example of video display device ]

Fig. 3 and 4 are diagrams for explaining a configuration example of the video display apparatus (video display apparatus 1) according to the present embodiment. Fig. 3 is a perspective view of the video display apparatus 1 viewed from the back side (the surface opposite to the surface on which the video is displayed), and fig. 4 is a plan view of the video display apparatus 1 viewed from the back side. The video display apparatus 1 includes a panel section 2, a support section 3, and a storage section 4.

The panel section 2 is a video display panel for displaying video. As shown in fig. 4, the panel portion 2 according to the present embodiment has a configuration in which two panel portions (panel portion 2A, panel portion 2B) are integrated. Needless to say, the panel section 2 may include one panel section or three or more panel sections. An Organic Light Emitting Diode (OLED), a Liquid Crystal Display (LCD), or the like may be applied to the panel part 2.

The support portion 3 is attached to the back face 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 turning portion such as a hinge. The inclination 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 functions as a speaker of the subwoofer.

The storage unit 4 is, for example, rod-shaped and attached to the back surface of the panel unit 2. The storage section 4 stores a vibration section 5 that vibrates the panel section 2, a control circuit (for example, a panel displacement control unit described later) that supplies an audio signal to the vibration section 5, and the like. The vibration section 5 stored in the storage section 4 includes, for example, two vibrators (vibrator 5A and vibrator 5B). The vibrators 5A and 5B are, for example, piezoelectric actuators. Each of the two vibrators 5A and 5B is mounted near the center of the back face of the corresponding panel portion. Specifically, the vibrator 5A is mounted near the center of the back surface of the panel portion 2A, and the vibrator 5B is mounted near the center of the back surface of the panel portion 2B (see fig. 4). Note that a plurality of vibrators controlled in the same manner may be mounted near the center of the back surface of each panel section.

[ internal configuration example of video display device ]

Fig. 5 is a block diagram showing a configuration including the internal configuration of the video display device 1. The video signal and the audio signal are input to the video display apparatus 1 as source signals. The video signal and the audio signal are input to the video display apparatus 1 through broadcasting, a network such as the internet, from a hard disk, a suitable memory such as an optical disk or a Universal Serial Bus (USB) memory, or the like. Note that a configuration of processing a video signal is omitted in fig. 5. A video signal input to the video display apparatus 1 is processed by a known video processing circuit, supplied to the panel section 2, and displayed on the panel section.

The video display device 1 includes a volume adjustment unit 10, a panel displacement control unit 20, and an amplifier 30. Note that, as in the present embodiment, in the case where the vibrating section 5 includes two vibrators 5A and 5B, the sound volume adjusting unit 10, the panel displacement control unit 20, and the amplifier 30 are set for each vibrator.

The panel displacement control unit 20 is connected to the output side of the volume adjusting unit 10. The amplifier 30 is connected to the output side of the panel displacement control unit 20. The vibrating portion 5 described above is connected to the output side of the amplifier 30.

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 adjusting unit 10 is output to the panel displacement control unit 20.

Illustratively, the panel displacement control unit 20 adjusts the low frequency level of the input audio signal supplied 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 20Hz to 200 Hz.

The amplifier 30 amplifies the audio signal supplied from the panel displacement control unit 20 with a predetermined amplification factor. The audio signal amplified by the amplifier 30 is supplied to the oscillation section 5. The vibrating 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 vibrating section 5. The viewer/listener of the video display apparatus 1 hears the sound generated by the vibration of the panel section 2.

(details of the Panel Displacement control Unit)

The panel displacement control unit 20 includes, for example: an image shake detection unit 201 as an example of a threshold 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. The video signal is supplied as an input video signal to the image shake detection unit 201. The audio signal supplied from the volume adjusting unit 10 is supplied as an input audio signal to each of the panel displacement detecting unit 202 and the delay unit 204.

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

In the case where the illuminance of the input video signal is small (that is, 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 portion 2 and image shake in which reflection vibration occurs. Therefore, in the case where the illuminance of the input video signal is small, the image shake detection unit 201 decreases the threshold value. Although 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 portion 2 is suppressed. As a result, the occurrence of image shake can be effectively suppressed.

On the other hand, in the case where the illuminance of the input video signal is large (that is, in the case where the input video signal is a bright image as a whole), no reflection or inconspicuous reflection occurs on the panel section 2, so that the possibility of occurrence of image shake is low. Therefore, in the case where the illuminance of the input video signal is large, the image shake detection unit 201 increases the threshold value. By setting the threshold value to be increased, the level of the low-frequency component of the input audio signal is maintained without being attenuated, or the amount of attenuation is reduced. Thereby, sound pressure can be ensured.

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

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 supplied from the volume adjustment unit 10. The panel displacement detection unit 202 includes a filter (for example, a second-order Infinite Impulse Response (IIR) low-pass filter (LPF)) that approximates the displacement characteristics of the panel section 2 measured in advance. The panel displacement detection unit 202 performs filter processing on the input audio signal to detect the displacement amount of the panel section 2 with respect to the input audio signal.

The control gain calculation unit 203 compares the threshold value supplied from the image shake detection unit 201 with the displacement amount detected by the panel displacement detection unit 202 to calculate a control gain based on the comparison result. The control gain is a parameter indicating the degree of lowering the level of the low frequency component of the audio signal. 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 the 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 with the control gain.

The control gain calculation unit 203 calculates a control gain corresponding to an amount by which the amount of displacement 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 amount by which the displacement amount detected by the panel displacement detection unit 202 exceeds the threshold increases. In the case where the amount of displacement 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 lowering the level of the low-frequency component.

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

As schematically shown in fig. 6, the dynamic EQ 205 adjusts the level of the low frequency component of the input audio signal based on controlling the gain. The audio signal processed by the dynamic EQ 205 is then output to the amplifier 30. As the dynamic EQ 205, a tilt type filter or a parametric equalizer may be applied. Fig. 7 shows frequency characteristics in the case of applying a tilt type filter as the dynamic EQ 205. Further, fig. 8 shows frequency characteristics in the case where a parametric filter is used as the dynamic EQ 205. Arrows in fig. 7 and 8 indicate that the control gain varies according to the calculation result of the control gain calculation unit 203. Note that fig. 6 shows an example of applying a tilted-type filter as the dynamic EQ 205.

[ operation example of Panel Displacement control Unit ]

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

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 ST 2.

In step ST2, the panel displacement detection 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 ST 3.

In step ST3, the control gain calculation unit 203 compares the threshold set in step ST1 with the displacement amount of the panel portion 2 calculated in step ST 2. As a result of the comparison, in the case where the amount of displacement of the panel portion 2 is larger than the threshold (yes determination), the control gain calculation unit 203 calculates a control gain corresponding to the amount by which the amount of displacement of the panel portion 2 exceeds the threshold so that the amount of displacement of the panel portion 2 falls below the threshold. The control gain calculation unit 203 supplies the calculated control gain to the dynamic EQ 205. Then, the process proceeds to step ST 4.

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

As a result of the comparison in the process of step ST3, in the case where the displacement amount of the panel portion 2 is less than or equal to the threshold value (no determination), 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 a set control gain (0dB), i.e., outputs the input audio signal without changing the level thereof. 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 smaller than the threshold value (determined to be no), the input audio signal may pass through the loop. The above process is repeated as appropriate.

Note that the start time, the hold time, and the release time may be set in the control gain. Assume for example-3 dB is calculated as the control gain. As shown in fig. 10, the start-up time is a time period (time period from t1 to t2 in fig. 10) for gradually changing the control gain from 0dB to-3 dB. In addition, the holding time is a period of time (a period of time from t2 to t3 in fig. 10) in which a state where the control gain is-3 dB is maintained. The release time is the time taken to return the control gain to 0dB after the control gain does not need to be-3 dB (the time period from t3 to t4 in fig. 10).

As described above, in the present embodiment, while the control gain is changed based on the activation time and the release time, the processing is performed by the dynamic EQ 205. 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, the process of gradually changing the control gain is performed at this timing so that the control gain is-3 dB.

When the level of the low-frequency component of the input audio signal is rapidly attenuated, the viewer/listener may feel uncomfortable from the auditory viewpoint. By appropriately setting the rise time, the hold time, and the release time, the level of the low-frequency component of the input audio signal can be prevented from rapidly decaying. In addition, human hearing is not sensitive to a decrease in sound pressure, but is sensitive to an increase in sound pressure. In consideration of such auditory characteristics, in the present embodiment, by setting the attack time to be short, the level of the low-frequency component of the input audio signal is quickly attenuated, thereby preventing the occurrence of image shake. Further, by setting the release time longer than the attack time, the level of the low-frequency component of the input audio signal gradually increases. As a result, it is possible to prevent the viewer/listener from feeling uncomfortable due to the change in the level of the low-frequency component of the input audio signal while suppressing the occurrence of image shake.

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

< modification >

The embodiments of the present invention have been specifically described above, but the contents of the present invention are not limited to the above embodiments, and various modifications can be made on the technical idea of the present invention.

In the above-described embodiment, the image shake detection unit 201 calculates the amount of displacement based on the characteristic relating to the illuminance of the input video signal, and sets the amount of displacement as the threshold value. However, the present disclosure is not limited thereto. The ease of occurrence of image shake differs not only by the illuminance of the input video signal but also by the illuminance of the viewing/listening space, the viewing/listening position, the reflectance of the panel section 2, and the like. For example, the brighter the viewing/listening space is, the more likely reflections and image jitter occur. Therefore, in the case where the viewing/listening space is bright, the threshold value is set to be small. Further, the closer the viewing/listening position is to the front of the panel section 2, the more easily the image shake is recognized. Therefore, the closer the viewing/listening position is to the front of the panel section 2, the smaller the threshold value is set. In addition, the higher the reflectance of the panel portion 2, the higher the possibility of occurrence of reflection and image blur. Therefore, in the case where the reflectance of the panel section 2 is high, the calculated threshold value is corrected to be reduced to some extent even in the case where the illuminance of the input video signal is large or in the case where the viewing/listening space is dark.

For example, as shown in fig. 11, an illuminance sensor 40 that detects illuminance of the viewing/listening space may be provided, and sensing data indicating the illuminance of the viewing/listening space may be supplied from the illuminance sensor 40 to the image shake detection unit 201. Then, the image shake detection unit 201 can calculate the threshold value by referring to the sensing data supplied 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). Further, the image shake detection unit 201 may correct the threshold value calculated based on the specification information (panel size, reflectance, etc.) of the panel section 2 stored in advance. Further, the image shake detection unit 201 can set the threshold value by appropriately combining the above-described methods.

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

The volume adjusting 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 such that volume information set in the volume adjustment unit 10 is supplied to the panel displacement detection unit 202. The panel displacement detection unit 202 may perform filtering processing according to the volume information.

In the flow of processing described in the present embodiment, the order of some processing may be changed, or some processing may be executed in parallel.

The present disclosure may also be realized by an apparatus, a method, a program, a system, and the like. For example, a program that performs the functions described in the above-described 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 programs. In addition, the contents described in the embodiments and modifications can be combined as appropriate. Further, the content of the present disclosure should not be construed as being limited by the effects exemplified in the present specification.

The present disclosure may also adopt the following configuration.

(1)

A signal processing apparatus comprising:

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

a threshold setting unit configured to calculate a displacement amount when image shake does not occur, and set the calculated displacement amount as a threshold; and

a gain adjustment unit configured to adjust a 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)

The signal processing device according to (2), further comprising,

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

The gain adjustment unit adjusts the level of the input audio signal using the control gain.

(3)

The signal processing device according to (1) or (2), wherein,

the gain adjustment unit changes the gain from 0dB to the control gain during a predetermined start-up time and changes the gain from the control gain to 0dB during a predetermined release time.

(4)

The signal processing device according to (3), wherein,

the value of the attack time is set to a value smaller than the release time.

(5)

The signal processing apparatus according to any one of (1) to (4), wherein,

the displacement detection unit includes a filter that approximates a displacement characteristic of the video display panel, which is measured in advance.

(6)

The signal processing device according to (2), wherein,

the gain adjustment unit adjusts the level of the input audio signal using the control gain so as not to allow the amount of displacement to exceed the threshold.

(7)

The signal processing apparatus according to any one of (1) to (4), wherein,

the threshold setting unit calculates the amount of displacement based on the characteristics of the input video signal.

(8)

The signal processing device according to (7), wherein,

the threshold setting unit calculates the amount of displacement based on the illuminance-related characteristic of the input video signal.

(9)

The signal processing device according to (7) or (8), wherein,

the threshold setting unit calculates the amount of displacement based on the sensing data supplied from the sensor.

(10)

The signal processing device according to (9), wherein,

the sensor includes at least one of an illuminance sensor and a sensor that detects a viewer/listener.

(11)

The signal processing device according to (9) or (10), wherein,

the threshold setting unit calculates the amount of displacement based on specification information of the video display panel.

(12)

A signal processing method, comprising:

causing a displacement detecting 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;

causing a threshold value setting unit to calculate a displacement amount when image shake does not occur, and setting the calculated displacement amount as a threshold value; and is

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

(13)

A program that causes a computer to execute a signal processing method comprising:

causing a displacement detecting 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;

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

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

(14)

A video display apparatus, comprising:

a vibrating section;

a video display panel configured to display a video and generate a sound by the vibration of the vibration portion;

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

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 includes:

a displacement detecting unit configured to detect a displacement amount of the video display panel based on the input audio signal, an

A threshold setting unit configured to calculate a displacement amount when image shake does not occur, and set the calculated displacement amount as a threshold; and

a gain adjustment unit configured to adjust a 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.

REFERENCE SIGNS LIST

1 video display device

2 panel part

5 vibrating part

5A, 5B vibrator

20 panel displacement control unit

30 amplifier

201 image shake detection unit

202 panel displacement detecting unit

203 control gain calculation unit

205 dynamic EQ.