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 /spl mu/m CMOS process with V/sub T/ = 0.8 V.
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机译：本文提出了一种新颖的电流模式前端，用于从两个音频信号中提取定位频谱线索。通过亚阈值MOS操作的当前模式对数域实现用于微功耗操作，同时仍可实现良好的带宽。另外，对数域处理可导致良好的线性度。由于易于实现某些数学运算，因此电流模式解决方案也是首选的。前端将输入信号分成不同的频段，并根据每个频段的信号包络计算单声道和双声道频谱提示。前端已经过优化，可以在1.8 V的电源电压下运行，并且大多数模块都是采用差分架构设计的。据我们所知，这是带有定位提示提取的前端的第一个日志域实现。该设计是使用标准的双多晶硅双金属0.8 / spl mu / m CMOS工艺进行的，V / sub T / = 0.8 V.
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