Audio Signal Decorrelation With Time-Switched Delay Mixing
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Solution Overview
Problem
Current audio signal decorrelation methods, especially when processing applause-like signals, suffer from signal degradation, spectral coloration, reduced crispness, and repetitive sound effects, particularly when used in headphones, due to high computational complexity and energy consumption.
Innovation Solution
A decorrelator that combines an audio input signal with its delayed representation, alternately swapping the signals in time intervals to generate decorrelated outputs without smearing transient attacks, using a frequency-independent time delay and minimal arithmetic operations, thus avoiding the precedence effect and spectral coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard decorrelators are used to generate decorrelated signals, then spatial width and decorrelation effect are improved, but signal quality degrades with transients (applause-like signals) and computational complexity increases
Solution Approach 1:
The patent applies dynamics by making the signal path configurable based on signal type. The system dynamically switches between different processing modes: for transient signals (applause-like), it bypasses the decorrelator to preserve transient clarity; for non-transient signals, it enables the decorrelator to provide spatial width. This dynamic adaptation resolves the contradiction by adjusting the system behavior according to the specific signal characteristics.
Solution Approach 2:
The patent applies local quality by treating different signal types differently within the same system. Instead of applying a uniform decorrelation process to all signals, it selectively applies decorrelation only to non-transient signals while preserving transient signals in their original form. This localized approach ensures high quality for transient signals while maintaining spatial width for other signals.
2Adaptability or versatility
If standard decorrelators are used to generate decorrelated signals, then spatial width is improved, but computational expenditure and complexity increase
Solution Approach 1:
The patent applies partial action by selectively applying decorrelation only when needed (for non-transient signals) rather than continuously to all signals. The system performs decorrelation partially - only for signal portions that benefit from it - thereby reducing overall computational expenditure while maintaining the spatial width effect where required.
Solution Approach 2:
The system dynamically adjusts its computational effort based on signal type detection. When transient signals are detected, the computationally intensive decorrelation process is bypassed; when non-transient signals are detected, the decorrelator is engaged. This dynamic control optimizes computational resource usage while maintaining spatial width effectiveness.
3Reliability
If decorrelation is applied to preserve transient clarity, then transient signal quality is improved, but spatial width effect is reduced
Solution Approach 1:
The patent applies segmentation by dividing the signal processing into separate paths based on signal type. Transient signals are routed through one path that preserves their original clarity without decorrelation, while non-transient signals are routed through another path that applies decorrelation for spatial width. This segmentation allows each signal type to receive appropriate processing without compromising the other.
Solution Approach 2:
The system dynamically selects the appropriate signal path based on real-time detection of transient characteristics. This dynamic routing ensures that transient signals maintain their clarity while non-transient signals gain spatial width, effectively resolving the contradiction between transient quality and spatial width effect.
4Device complexity
If simple time delay is used for decorrelation, then computational complexity is reduced, but repetitive sound impression and spectral coloration occur
Solution Approach 1:
The patent extracts and removes the harmful repetitive sound impression and spectral coloration effects that result from simple time delay decorrelation. By detecting transient signals and bypassing the decorrelator entirely for these signals, the system eliminates the source of repetitive artifacts while maintaining low computational complexity for transient processing.
Solution Approach 2:
The patent converts the potential harm of simple time delay (repetitive sound) into a benefit by using the absence of decorrelation for transient signals. The system recognizes that for transient signals, no decorrelation is needed, and thus the simple bypass approach actually provides the benefit of preserving transient clarity without introducing artifacts.
Data Source
AI summary
In a case of transient audio input signals, in a multi-channel audio reconstruction, uncorrelated output signals are generated from an audio input signal in that the audio input signal is mixed with a representation of the audio input signal delayed by a delay time such that, in a first time interval, a first output signal corresponds to the audio input signal, and a second output signal corresponds to the delayed representation of the audio input signal, wherein, in a second time interval, the first output signal corresponds to the delayed representation of the audio input signal, and the second output signal corresponds to the audio input signal.