The Tongue Drive System (TDS) is a new unobtrusive, wireless, and wearable assistive device that allows for real-time tracking of the voluntary tongue motion in the oral space for communication, control, and navigation applications. The latest TDS prototype appears as a wireless headphone and has been tested in human subject trials. However, the robustness of the external TDS (eTDS) in real-life outdoor conditions may not meet safety regulations because of the limited mechanical stability of the headset. The intraoral TDS (iTDS), which is in the shape of a dental retainer, firmly clasps to the upper teeth and resists sensor misplacement. However, the iTDS has more restrictions on its dimensions, limiting the battery size and consequently requiring a considerable reduction in its power consumption to operate over an extended period of two days on a single charge. In this brief, we propose an ultralow-power local processor for the TDS that performs all signal processing on the transmitter side, following the sensors. Assuming the TDS user on average issuing one command/s, implementing the computational engine reduces the data volume that needs to be wirelessly transmitted to a PC or smartphone by a factor of 1500×, from 12 kb/s to ~8 b/s. The proposed design is implemented on an ultralow-power IGLOO nano field-programmable gate array (FPGA) and is tested on AGLN250 prototype board. According to our post-place-and-route results, implementing the engine on the FPGA significantly drops the required data transmission, while an application-specific integrated circuit (ASIC) implementation in a 65-nm CMOS results in a 15× power saving compared to the FPGA solution and occupies a 0.02-mm2 footprint. As a result, the power consumption and size of the iTDS will be significantly reduced through the use of a much smaller rechargeable battery. Moreover, the system can operate longer following every recharge, improving the iTDS usability.
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机译:舌头驱动系统(TDS)是一种新型的,不显眼的,无线的,可穿戴的辅助设备,它可以实时跟踪口腔中的自愿舌头运动,以进行通信,控制和导航应用。最新的TDS原型作为无线耳机出现,并且已经在人体试验中进行了测试。但是,由于头戴式受话器的机械稳定性有限,因此在现实户外条件下,外部TDS(eTDS)的坚固性可能不符合安全法规。牙齿固定器形状的口腔内TDS(iTDS)牢固地卡在上牙上,可防止传感器错位。但是,iTDS在其尺寸上有更多限制,限制了电池尺寸,因此需要大幅度降低其功耗,才能在单次充电的情况下连续两天工作。在本简介中,我们为TDS提出了一种超低功耗本地处理器,该处理器将在传感器之后的发射机侧执行所有信号处理。假设TDS用户平均发出一个命令,则实施计算引擎会将需要无线传输到PC或智能手机的数据量减少了1500倍,从12 kb / s降低到〜8 b / s。拟议的设计在超低功耗IGLOO纳米现场可编程门阵列(FPGA)上实现,并在AGLN250原型板上进行了测试。根据我们的布局布线后的结果,在FPGA上实现引擎会大大降低所需的数据传输,而在65纳米CMOS中的专用集成电路(ASIC)实现则可节省15倍的功耗到FPGA解决方案,占地面积仅为0.02mm 2 sup>。结果,通过使用小得多的可充电电池,iTDS的功耗和尺寸将大大降低。此外,系统在每次充电后可以运行更长的时间,从而提高了iTDS的可用性。
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