Detection accuracy in zero-crossing-based spectrum analysis and image reconstruction.
Detection accuracy in zero-crossing-based spectrum analysis and image reconstruction.
复制标题
基于过零的频谱分析和图像重建的检测精度。
作者：
C. Saloma;M. Escobido
我们研究如何准确地描述一个信号交叉的确切位置的影响的频谱或重建的二维图像的质量是由采样零交叉的表示计算。奈奎斯特间隔内的零交叉的位置由在交叉发生之前已经过去的时钟脉冲的数量与可以在该间隔内拟合的时钟脉冲的总数之间的比率来描述。脉冲缩放奈奎斯特间隔，并且它们的总数越大，对交叉位置的描述越准确。在真实的过零检测器中，增加奈奎斯特间隔内包含的方波脉冲总数的能力受到其电路组件的有限响应时间的限制[Opt.Lett. 18，1468（1993）]。
We examine how the accuracy in describing the exact location of a signal crossing affects the quality of the spectrum or the reconstructed two-dimensional image that is computed by a representation of sampled zero crossings. The position of a zero crossing within a Nyquist interval is described by the ratio between the number of clock pulses that have elapsed before the crossing occurred and the total number of clock pulses that could fit within the interval. The pulses scale the Nyquist interval, and the greater their total number, the more accurate the description of the crossing location. In a real zero-crossing detector the ability to increase the total number of square pulses contained within the Nyquist interval is limited by the finite response time of its circuit components [Opt. Lett. 18, 1468 (1993)].