Spatial Audio Reproduction For Video Object Alignment
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Solution Overview
Problem
Rendering devices with multiple loudspeakers and displays often experience misalignment between the position of video objects and perceived audio sources due to differences in field of view and audio rendering, leading to a suboptimal audio-visual experience.
Innovation Solution
An apparatus and method that aligns spatial audio reproduction with video objects by modifying spatial metadata based on the field of view information, using different playback procedures for sound directions within and outside the loudspeaker span, and adjusting parameters to ensure accurate audio positioning relative to displayed content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spatial audio reproduction is performed using multiple loudspeakers, then spatial audio quality is improved, but misalignment between audio sources and video objects occurs
Solution Approach 1:
The system obtains field of view information from video and uses it as feedback to adjust the spatial reproduction of audio signals. By continuously aligning audio spatial metadata with video field of view parameters, the system corrects misalignment between audio sources and video objects, resolving the contradiction between spatial audio quality and alignment accuracy.
Solution Approach 2:
The system changes spatial parameters in audio metadata based on video field of view information. By adjusting parameters such as horizontal and vertical field of view angles, and mapping audio spatial coordinates to video display coordinates, the system maintains accurate alignment while preserving spatial audio quality.
2Measurement precision
If different playback procedures are used for different sound directions, then audio reproduction accuracy is improved, but system complexity increases
Solution Approach 1:
The system segments the audio reproduction process into different procedures based on sound direction. It divides audio signals into those within the loudspeaker span (front region) and those outside (surround region), applying amplitude panning for front sounds and crosstalk cancellation for surround sounds. This segmentation improves accuracy while keeping each procedure relatively simple.
Solution Approach 2:
The system dynamically selects playback procedures based on the spatial position of audio sources. By determining whether each sound direction falls within or outside the loudspeaker span, the system adaptively applies the appropriate reproduction method, improving overall accuracy without requiring a completely complex fixed system.
Data Source
AI summary
An apparatus (101) for enabling reproduction of spatial audio signals. The apparatus comprises means for obtaining (401) audio signals (501) comprising one or more channels and obtaining (403) spatial metadata (503) relating to the audio signals (501). The spatial metadata (503) comprises information that indicates how to spatially reproduce the audio signals. The apparatus also comprises means for obtaining (405) information relating to a field of view of video (505) wherein the video is for display on a display (205) of a rendering device (201) and wherein the video is associated with the audio signals (501). The apparatus also comprises means for aligning (407) spatial reproduction of the audio signals based, at least in part, on the obtained spatial metadata (503), with objects (309A, 309B) in the video according to the obtained information relating to the field of view of video; and enabling (409) reproduction of the audio signals based on the aligning (407).