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

A signal processing method comprising:

• causing a displacement detection unit to detect a displacement amount of a video display panel that is vibrated to generate sound on a basis of an input audio signal;
• causing a threshold setting unit to calculate a displacement amount at which no image shake occurs and set a displacement amount calculated as a threshold;
• and
• causing a gain adjustment unit to adjust a level of the input audio signal on a basis of a result of comparison between a displacement amount detected by the displacement detection unit and the threshold.

A video display device comprising:

• a vibration portion;
• a video display panel configured to display a video and generate sound by being vibrated by the vibration portion;
• a panel displacement control unit configured to control displacement of the video display panel;
• and
• an amplifier configured to amplify an audio signal output from the panel displacement control unit and output an audio signal amplified to the vibration portion, wherein
• the panel displacement control unit includes
• a displacement detection unit configured to detect a displacement amount of the video display panel on a basis of an input audio signal,
• a threshold setting unit configured to calculate a displacement amount at which no image shake occurs and set a displacement amount calculated as a threshold, and
• a gain adjustment unit configured to adjust a level of the input audio signal on a basis of a result of comparison between a displacement amount detected by the displacement detection unit and the threshold.