Dynamic Gain Adjustment for Rotation-Responsive Spatial Audio
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Solution Overview
Problem
Current interactive display technologies, such as head-mounted displays, fail to dynamically adjust audio signals in response to user rotation, leading to a reduced sense of presence, especially in multi-channel applications where the ratio between channels remains unchanged.
Innovation Solution
A sound effect controlling method and device with dynamic gain adjustment, which calculates and adjusts the gain of 5-channel virtual signals based on the user's rotation angle, transforming original sound signals into virtual center, left, and surrounding sound signals to enhance the sense of presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If audio signals remain unchanged during user rotation, then device complexity is reduced, but the sense of presence deteriorates
Solution Approach 1:
The patent implements dynamic audio signal processing where gain parameters for different channels are continuously adjusted based on the user's rotation angle. The system transitions from static audio output to dynamic adaptation, calculating updated gain values (gL, gR, gC, gSL, gSR) as the user rotates, thereby maintaining spatial audio accuracy and sense of presence throughout movement.
Solution Approach 2:
The patent changes audio signal parameters (gain values) in response to user rotation. Specifically, it modifies the left channel gain (gL), right channel gain (gR), center channel gain (gC), left surrounding gain (gSL), and right surrounding gain (gSR) based on rotation angle θ, creating dynamically adjusted audio output that maintains spatial relationships during user movement.
2Device complexity
If multi-channel ratios remain unchanged during rotation, then signal processing complexity is reduced, but spatial accuracy deteriorates
Solution Approach 1:
The patent applies different gain adjustments to different audio channels based on their spatial positions. The left channel (gL), right channel (gR), center channel (gC), left surrounding channel (gSL), and right surrounding channel (gSR) each receive customized gain values according to their respective spatial locations and the user's rotation angle, preserving accurate spatial localization for each sound source.
Solution Approach 2:
The system dynamically recalculates the ratio relationships between multi-channels during user rotation. Instead of maintaining fixed channel ratios, the patent continuously updates gain parameters (gL, gR, gC, gSL, gSR) as function of rotation angle θ, allowing the audio field to adapt dynamically to user orientation changes and maintain spatial accuracy.
3Reliability
If 5-channel virtual signals are adjusted according to rotation angle, then sense of presence is improved, but device complexity increases
Solution Approach 1:
The patent segments the audio signal processing into five distinct channels, each with its own gain parameter (gL, gR, gC, gSL, gSR). By dividing the audio field into center, left, right, left surrounding, and right surrounding channels, the system can independently adjust each channel's gain based on rotation angle, achieving accurate spatial audio without requiring complete signal reconstruction.
Solution Approach 2:
The patent implements parameter-based audio adjustment by changing gain values (gL, gR, gC, gSL, gSR) as functions of rotation angle θ. This approach maintains sense of presence through mathematical parameter adjustment rather than complex signal processing, using gain modulation to achieve spatial audio adaptation efficiently.
Data Source
AI summary
A sound effect controlling method and a sound outputting device with dynamic gain adjustment are disclosed. The sound effect controlling method includes the following steps. An original left sound signal and an original right sound signal are transformed to a virtual center sound signal, a virtual left sound signal, a virtual left surrounding sound signal, a virtual right surrounding sound signal and a virtual right sound signal according to a center gain, a left gain, a left surrounding gain, a right surrounding gain and a right gain, which are calculated according to a rotation angle and a dual sound relationship. An updated left sound signal and an updated right sound signal are obtained according to the virtual center sound signal, the virtual left sound signal, the virtual left surrounding sound signal, the virtual right surrounding sound signal and the virtual right sound signal.