Panel Audio Gain Control for Stable Sound Image and Low Image Shake
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Solution Overview
Problem
In video display devices that generate sound by vibrating panels, there is a challenge to maintain sound pressure while preventing the shift of the sound image position and minimizing image shake, which occurs due to vibrations affecting the viewer's experience.
Innovation Solution
A signal processing device with first and second panel displacement control units, each with gain adjustment units, and a control unit that determines correlation between audio signals to adjust levels dynamically, ensuring sound pressure is maintained and image shake is minimized by adjusting the low-frequency components based on luminance and displacement thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the level of audio signals is reduced to suppress panel vibration and image shake, then image shake is prevented, but sound pressure decreases
Solution Approach 1:
The patent applies dynamics by making the gain adjustment amounts variable rather than fixed. The control unit dynamically adjusts the gain of each audio signal based on real-time correlation analysis between signals and panel displacement thresholds. This allows the system to adaptively optimize between sound pressure maintenance and image shake suppression根据不同 signal conditions
Solution Approach 2:
The patent changes the parameter of gain adjustment amount based on signal correlation and displacement thresholds. By analyzing the correlation between audio signals and comparing panel displacement against thresholds, the system adjusts gain parameters dynamically. This parameter change approach resolves the contradiction by optimizing sound pressure and image shake suppression based on actual signal conditions rather than applying fixed reduction
2Reliability
If the level of one audio signal is adjusted independently to maintain sound pressure, then sound pressure is maintained, but the sound image position shifts
Solution Approach 1:
The patent implements feedback by analyzing the correlation between audio signals and using this information to control gain adjustment amounts. The control unit continuously monitors signal correlation and adjusts gains accordingly, creating a closed-loop system that maintains sound image position stability while preserving sound pressure. The feedback mechanism ensures that independent signal adjustments do not cause positional shifts
Solution Approach 2:
The patent changes gain parameters based on correlation analysis results. When signals are highly correlated, the system adjusts gains to maintain sound image position; when correlation is low, it allows more independent adjustment to maintain sound pressure. This dynamic parameter adjustment resolves the contradiction between sound pressure maintenance and sound image position stability
Data Source
AI summary
A signal processing device includes a first panel displacement control unit to which a first audio signal is input, a second panel displacement control unit to which a second audio signal is input, and a control unit configured to control the first panel displacement control unit and the second panel displacement control unit. The first panel displacement control unit includes a first gain adjustment unit configured to adjust a level of the first audio signal, the second panel displacement control unit includes a second gain adjustment unit configured to adjust a level of the second audio signal, and the control unit includes a correlation determination unit configured to determine presence or absence of a correlation between the first audio signal and the second audio signal, and a gain control unit configured to control a level adjustment amount in each of the first gain adjustment unit and the second gain adjustment unit on the basis of a determination result of the correlation determination unit.