将多通道混音与限幅耦合设计，降低音频失真并提升实时处理效率。
Constraint Optimized Multichannel Mixer-limiter Design
- 将混音与限幅联合建模为线性约束的二次规划问题。
- 在真实音响阵列上实现失真降低，同时满足实时计算需求。
- 适合需要低延迟高保真音频处理的系统开发者。
由于计算复杂度和运行成本较高，多通道音频混音器与限幅器的设计传统上相互独立，以适应扬声器阵列的内容回放。本文提出一种耦合的混音-限幅-包络设计，将其建模为高效的线性约束二次规划问题，通过优化多通道增益变量来最小化失真目标，同时满足样本混合约束。文中提出了新型的非对称重叠相加窗优化方法、目标函数近似技术，以及变量与约束缩减策略。实验表明，该耦合设计显著降低了失真，并在保证高效实时处理的前提下实现了计算资源的合理权衡。
原文摘要 · Abstract (English)
Multichannel audio mixer and limiter designs are conventionally decoupled for content reproduction over loudspeaker arrays due to high computational complexity and run-time costs. We propose a coupled mixer-limiter-envelope design formulated as an efficient linear-constrained quadratic program that minimizes a distortion objective over multichannel gain variables subject to sample mixture constraints. Novel methods for asymmetric constant overlap-add window optimization, objective function approximation, variable and constraint reduction are presented. Experiments demonstrate distortion reduction of the coupled design, and computational trade-offs required for efficient real-time processing.
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