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首页> 外文期刊>IEEE transactions on circuits and systems . I , Regular papers >Analysis of Encoding Degradation in Spiking Sensors Due to Spike Delay Variation
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Analysis of Encoding Degradation in Spiking Sensors Due to Spike Delay Variation

机译：尖峰延迟变化导致尖峰传感器编码劣化的分析

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Spiking sensors such as the silicon retina and cochlea encode analog signals into massively parallel asynchronous spike train output where the information is contained in the precise spike timing. The variation of the spike timing that arises from spike transmission degrades signal encoding quality. Using the signal-to-distortion ratio (SDR) metric with nonlinear spike train decoding based on frame theory, two particular sources of delay variation including comparison delay TDC and queueing delay TDQ are evaluated on two encoding mechanisms which have been used for implementations of silicon array spiking sensors: asynchronous delta modulation and self-timed reset. As specific examples, TDC is obtained from a 2T current-mode comparator, and TDQ is obtained from an M/D/1 queue for 1-D sensors like the silicon cochlea and an MX/D/1 queue for 2-D sensors like the silicon retina. Quantitative relations between the SDR and the circuit and system parameters of spiking sensors are established. The analysis method presented in this work will be useful for future specifications-guided designs of spiking sensors.
机译：诸如硅视网膜和耳蜗之类的尖峰传感器将模拟信号编码为大规模并行异步尖峰序列输出，其中信息包含在精确的尖峰定时中。由尖峰传输引起的尖峰定时的变化降低了信号编码质量。使用基于帧理论的非线性失真序列解码的信号失真比（SDR）度量，在两个已用于芯片实现的编码机制上评估了两个特定的延迟变化源，包括比较延迟TDC和排队延迟TDQ阵列峰值传感器：异步增量调制和自定时复位。作为特定示例，TDC是从2T电流模式比较器获得的，而TDQ是从用于1D传感器（如硅耳蜗）的M / D / 1队列获得的，以及从用于2D传感器（如硅耳蜗）的MX / D / 1队列获得的硅视网膜。建立了SDR与尖峰传感器的电路和系统参数之间的定量关系。这项工作中介绍的分析方法将对尖峰传感器的未来规范指导设计很有用。

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