Adaptive Spatial Audio Rendering at Loudspeaker Playback Limits
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Solution Overview
Problem
Existing spatial audio rendering technologies struggle with maintaining consistent spatial balance and preventing perceptual distortion when played over a set of loudspeakers with varying playback capabilities, particularly when signal levels approach the playback limit thresholds of less capable speakers.
Innovation Solution
A method that dynamically adjusts the mapping of audio signals to loudspeaker feeds based on signal level and playback limit thresholds, optimizing the distribution of audio components across loudspeakers to maintain intended spatial positions while avoiding distortion, by using time- and frequency-varying mappings and zone-based strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If audio signals are mapped to loudspeaker feeds using fixed mapping strategies, then the implementation is simple, but spatial balance and perceptual accuracy deteriorate when signal levels approach playback limit thresholds of less capable speakers
Solution Approach 1:
The patent implements dynamic mapping strategies that adapt in real-time based on signal level conditions. The system transitions from fixed mapping to dynamic mapping that adjusts the distribution of audio components across loudspeakers based on current signal levels relative to playback limit thresholds, thereby maintaining spatial balance accuracy without requiring overly complex static configurations
Solution Approach 2:
The system changes mapping parameters dynamically based on signal level conditions. When signal levels approach playback limit thresholds, the mapping parameters are adjusted to redistribute audio components, preventing perceptual distortion while maintaining spatial accuracy. This parameter adaptation resolves the contradiction between simplicity and precision
2Ease of operation
If audio components are distributed evenly across all loudspeakers, then the system is easy to operate, but perceptual distortion occurs when some speakers approach their playback limits
Solution Approach 1:
The patent applies local quality by treating different loudspeakers differently based on their individual playback capabilities and current signal levels. Instead of uniform distribution, the system identifies which speakers are approaching their limits and adjusts the local mapping for those specific speakers, maintaining overall system reliability without complicating the global operation
Solution Approach 2:
The system performs self-service by automatically detecting when speakers approach their playback limits and autonomously adjusting the mapping distribution. This self-adjusting mechanism maintains playback quality consistency without requiring manual intervention, preserving ease of operation while ensuring reliability
3Manufacturing precision
If the mapping is adjusted dynamically based on signal level, then spatial balance is maintained, but computational complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing mapping strategies for different signal level conditions. During playback, the system simply selects and applies the appropriate pre-computed mapping based on current signal levels, maintaining spatial position accuracy without requiring complex real-time computations
Solution Approach 2:
The system applies partial action by adjusting only the necessary mapping parameters that affect spatial balance, rather than recomputing the entire mapping. This selective adjustment maintains spatial position accuracy while minimizing computational overhead
4Power
If signal energy is concentrated in fewer loudspeakers, then playback level is maintained, but spatial distribution and balance are compromised
Solution Approach 1:
The patent uses dynamic mapping that continuously adapts the distribution of signal energy across loudspeakers based on their current signal levels relative to playback limits. This dynamic adjustment maintains overall playback level by redistributing energy to available speakers while preserving spatial balance stability through condition-based adaptation
Data Source
AI summary
Rendering audio signals may involve a mapping for each audio signal to the loudspeaker signals computed as a function of an audio signal's intended perceived spatial position, physical positions associated with the loudspeakers and a time- and frequency-varying representation of loudspeaker signal level relative to a maximum playback limit of each loudspeaker. Each mapping may be computed to approximately achieve the intended perceived spatial position of an associated audio signal when the loudspeaker signals are played back. A representation of loudspeaker signal level relative to a maximum playback limit may be computed for each audio signal. The mapping of an audio signal into a particular loudspeaker signal may be reduced as loudspeaker signal level relative to a maximum playback limit increases above a threshold, while the mapping may be increased into one or more other loudspeakers for which the maximum playback limits are less than a threshold.