LOWER POWER CMOS CIRCUIT FOR HEARING AID FEEDBACK

产品说明： 助听器最重要的功能是放大声音， 以补偿由听力损伤引起的听觉灵敏度的损失。 任何HA实现此功能的能力都可能显著降低， 当HA接收器的放大声音输出到达 麦克风和我重新放大，导致这个过程重复在一个 再生闭环系统 熟悉的结果是振荡的 反馈（FB），表现为声音质量的可听失真和高 这使医管局毫无用处。 目前，没有 实际解决FM问题的方法，而不是降低增益。 HA，从而损害其最重要的功能。 拟议研究的主要目的是实施一项医管局 算法，可以大大减少FM的问题。 我们计划 开发和评估高性能数字FM消除算法， 低功耗H电路，并将此算法和电路移植到HA 助听器的使用方法 我们 建议进行为期三年的算法模拟计划， 实时实现，数字电路设计与制造，原型 助听器建设，实验室现场试验评估， 正常听力和听力受损的受试者。

DESCRIPTION: The most important function of a hearing aid (HA) is to amplify sound so as to compensate for loss of auditory sensitivity caused by hearing impairment. The ability of any HA to fulfill this function can be significantly compromised where amplified sound output from the HA receiver reaches the microphone and i re-amplified, causing the process to repeat in a regenerative closed loop system. The familiar result is oscillatory feedback (FB), manifest as audible distortion of sound quality and high pitched squealing, which renders the HA useless. At present there exists no practical solution to the problem of FM other than to reduce the gain of the HA, and thus to compromise its most important function. The primary objective of the proposed research is to implement a HA algorithm that can substantially reduce the problem of FM. We plan to develop and evaluate a high performance digital FM cancellation algorithm in a low power H circuit, and to transfer this algorithm and circuit to a HA manufacturer for implementation in commercially available hearing aids. We propose to conduct a three-year program of algorithm simulation and real-time implementation, digital circuit design and fabrication, prototype hearing aid construction, an laboratory field trial evaluations with normally hearing and hearing impaired subjects.