STTR Phase I: Modular Feedforward Adaptive Noise Control

这项小型企业技术转让（STTR）第一阶段项目旨在展示多用途主动噪声控制模块的概念，该模块可广泛应用于需要噪声控制的各种环境和市场。数字信号处理器（DSP）已经成熟到基于最小均方（LMS）滤波器的主动降噪（ANR）是可行的。然而，传统的LMS滤波器不能有效地响应非平稳信号，因此在电话之外，采用自适应前馈控制的基于dsp的商业噪声控制产品是不可用的。该项目旨在开发一个ANR模块，该模块实现了基于专利Lyapunov调谐方法的创新自适应滤波器。与传统的前馈LMS滤波器或反馈ANR相比，该方法显著提高了LMS滤波器的低频降噪性能，增强了LMS滤波器的性能。S跟踪和有效消除非平稳噪声的能力。第一阶段STTR旨在评估使用李雅普诺夫调谐滤波器的ANR通用DSP模块的概念，该滤波器可应用于各种开放空间或源噪声消除问题。开放空间ANR在指定的体积内提供噪音衰减，而源消除可减少重型或轻型机械产生的源噪音。第一阶段的任务重点是评估即插即用模块的潜力，由于采用了创新的LMS滤波器，该模块可以适应各种噪声源特性和使用该模块的声学环境的一系列动态。这项研究和最终的产品满足了社会对降噪技术的重大需求，以防止噪音和振动，减少职业听力损失，并提高人类在嘈杂环境中的效率。这种通用ANR模块的应用范围包括在飞机或施工车辆的机舱内为乘客头部周围的空间提供安静区域，以及对受噪声和振动影响的敏感仪器进行声学和振动保护。该模块为噪音控制咨询行业提供了一种快速部署有效改造ANR解决方案的方法，用于减少高噪音机舱（飞机，车辆和建筑设备）中机械设备和管道产生的噪音，并通过在制造/工业环境，机场和办公楼中创造安静的空间。

This Small Business Technology Transfer (STTR) Phase I project seeks to demonstrate the concept of a multipurpose active noise control module with broad application to a variety of environments and markets requiring acoustic noise control. Digital Signal Processors (DSP) have matured to the point where active noise reduction (ANR) based on least mean square (LMS) filters is viable. However, traditional LMS filters do not respond effectively to non-stationary signals, thus outside of telephony, commercial DSP-based noise control products employing adaptive feedforward control are unavailable. This project seeks to develop an ANR module that implements an innovative adaptive filter based on a patented Lyapunov tuning method. This method improves low frequency noise reduction performance significantly over traditional feedforward LMS filters or feedback ANR, and it enhances the LMS filter.s ability to track and effectively cancel non-stationary noise. This Phase I STTR seeks to evaluate the concept of a general purpose DSP module for ANR using Lyapunov-tuned filters that can be applied to a variety of open space or source noise cancellation problems. Open space ANR provides noise attenuation within a specified volume, while source cancellation reduces source noise created by heavy or light machinery. Phase I tasks focus on evaluating the potential for a plug-and-play module that, due to innovative LMS filters, can accommodate a variety of noise source characteristics and a range of dynamics of the acoustic environment in which the module is used. The research and eventual product meets a significant societal need for noise abatement technology to protect against noise and vibration, reduce occupational hearing loss, and increase human effectiveness in noisy environments. The applications for this general-purpose ANR module range from providing a quiet zone in the space around a passenger's head in the cabin of an aircraft or construction vehicle to acoustic and vibration protection of sensitive instrumentation that is subject to noise and vibration. The module serves the noise control consulting industry by providing a means of rapid deployment of effective retrofit ANR solutions for reducing noise due to mechanical equipment and ducting, in high noise cabins (aircraft, vehicle, and construction equipment), and by creating quiet spaces in manufacturing/industrial settings, airports, and office buildings.