This paper proposes a novel current-mode front end for the extraction of localization spectral cues from two audio signals. A current mode log domain implementation via subthreshold MOS operation is used for micropower operation while still achieving a good bandwidth. In addition, log domain processing results in good linearity. A current mode solution is also preferred because of the ease of implementation of certain mathematical operations. The front end splits the input signals into different frequency bands and computes monaural and interaural spectral cues from the resulting signal envelopes for each band. The front end has been optimized to operate at a supply voltage of 1.8 V and most blocks have been designed using a differential architecture. To our knowledge, this is the first log domain implementation of a front end with localization cues extraction. The design has been carried out using a standard double-poly double metal 0.8 μm CMOS process with V{sub}T = 0.8V.
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机译：本文提出了一种新的电流模式前端，用于从两个音频信号提取定位光谱线索。通过亚阈值MOS操作的电流模式日志域实现用于微电机操作，同时仍然实现了良好的带宽。此外，日志域处理导致良好的线性度。由于某些数学运算的易于实现，还优选电流模式解决方案。前端将输入信号分成不同的频带，并计算来自每个频带的所得信号信封的单个和互连光谱线圈。前端已被优化以在1.8 V的电源电压下操作，并且使用差分架构设计了大多数块。据我们所知，这是第一个具有本地化线索提取的前端的第一个日志域实现。使用标准的双多金属双金属0.8μmCMOS工艺进行设计，具有V {SUB} T = 0.8V。
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