一个具有自适应取阈功能的光电网络系统及其性能分析

An Opto-Electronical Network with Ability of Adaptive Thresholding and It’s Performance Analysis

提出了用光电混合网络来完成自适应取阈功能的硬件实现方法。该网络系统能根据输入状态的不同 ,通过网络单元间的相互竞争而达到对系统的阈值的自适应调整 ,使阈值总是等于最大输入值而完成“胜者全取”(WTA)。该网络系统主要由非晶硅半导体PIN光电探测阵列和“胜者全取”电子网络组成。又由于系统完全采用并行处理方式 ,因而具有响应速度快、灵敏度高、寻址能力强、结构简单和性能稳定等优点 ,能方便有效地应用于自适应取阈、相关峰检测、联想存储等光电混合系统。对一个 36个单元的网络进行了实验测试并对其性能进行了分析。

A new opto electronical network with the function of adaptive thresholding is proposed. According to the input modes, it can adaptively adjust the threshold value of the system through competition among the net units. As a result, the threshold is always equal to the maximum input. So the function of WAT (winner take all) is achieved. The system is mainly composed of a Si PIN photo electrical detector and WTA electrical network. With parallel processing, it permits rapid response, high sensitivity, better addressing capability, simpler structure and stable performance, etc. It can be conveniently applied to opto electronical systems such as adaptive thresholding, correlation peak detecting and associative memory. A specific network with 36 units is analyzed and the experimentce results are presented.