Spatial Audio Synchronization via IMU Movement Tracking
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Solution Overview
Problem
Existing spatial audio processing methods fail to maintain synchronization between image and sound when a user moves their head, leading to a disjointed experience due to the lack of consideration for head movement information in non-head-mounted display devices.
Innovation Solution
A spatial audio processing method and apparatus that utilize inertial measurement units (IMUs) in both video and audio reproduction devices to track movement information, adjusting spatial audio processing based on whether the video reproduction device's movement satisfies predetermined conditions, such as rapid movement or repetitive patterns, to ensure synchronized audio and video alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If spatial audio processing is performed without considering head movement information, then device complexity is reduced, but synchronization between image and sound deteriorates
Solution Approach 1:
The system performs preliminary action by obtaining movement information from IMU sensors before spatial audio processing, and by pre-determining whether the video reproduction device movement satisfies predetermined conditions. This advance preparation enables the system to select the appropriate processing path (using only audio reproduction device movement information or combining both devices' movement information) to maintain synchronization without adding complex real-time processing requirements.
2Speed
If spatial audio processing uses only audio reproduction device movement information, then processing speed is improved, but audio accuracy deteriorates when video reproduction device moves
Solution Approach 1:
The system implements dynamics by adaptively adjusting the spatial audio processing method based on the movement characteristics of the video reproduction device. When the video reproduction device movement satisfies predetermined conditions (indicating significant movement), the system dynamically switches to a mode that incorporates both video and audio reproduction device movement information, thereby maintaining audio positioning accuracy while managing processing speed through conditional logic.
3Measurement precision
If spatial audio processing combines both video and audio reproduction device movement information, then audio accuracy is improved, but device complexity increases
Solution Approach 1:
The system applies local quality by using different processing strategies in different situations. When the video reproduction device movement satisfies predetermined conditions, the system uses a simplified approach relying primarily on audio reproduction device movement information. When the conditions are not met, the system enhances processing by combining both devices' movement information. This context-dependent quality adjustment optimizes the balance between accuracy and complexity.
4Reliability
If the system monitors video reproduction device display activation status, then synchronization reliability is improved, but energy consumption increases
Solution Approach 1:
The system implements self-service by utilizing the display activation status information that is already being tracked by the video reproduction device for its normal operation. Rather than adding separate monitoring mechanisms, the system leverages existing device state information to determine whether to apply enhanced spatial audio processing, thereby improving synchronization reliability without significantly increasing energy consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach maintains immersive audio experiences by dynamically adjusting spatial audio processing based on user movement, ensuring that sound sources are accurately positioned in 3D space relative to the video content, even when the video reproduction device is not ideal, thereby enhancing user engagement and audio quality.
Implementation Method 1
the first movement information is obtained by an inertial measurement unit (IMU) of the video reproduction device, the second movement information is obtained by an IMU of the audio reproduction device
Implementation Method 2
each of the IMU of the video reproduction device and the IMU of the audio reproduction device includes at least one of an acceleration sensor, an angular velocity sensor (gyroscope), and a geomagnetic sensor (magnetometer)
Implementation Method 3
each of the IMU of the video reproduction device and the IMU of the audio reproduction device includes at least one of an acceleration sensor, an angular velocity sensor (gyroscope), and a geomagnetic sensor (magnetometer)
Implementation Method 4
each of the IMU of the video reproduction device and the IMU of the audio reproduction device includes at least one of an acceleration sensor, an angular velocity sensor (gyroscope), and a geomagnetic sensor (magnetometer)
Data Source
AI summary
A spatial audio processing method may include an operation of obtaining first movement information of a video reproduction device, an operation of obtaining second movement information of an audio reproduction device, an operation of obtaining an audio signal, and an operation of performing, based on whether the first movement information satisfies a predetermined condition, spatial audio processing on the audio signal, wherein, in case that the first movement information satisfies the predetermined condition, the spatial audio processing may be performed based on the second movement information, and in case that the first movement information does not satisfy the predetermined condition, the spatial audio processing may be performed based on the first movement information and the second movement information.