Splitspectrum processing  Analysis of polarity thresholding algorithm for improvement of signaltonoise ratio and detectability in ultrasonic signals
Abstract
A polarity thresholding algorithm that has recently been developed for splitspectrum processing for ultrasonic coherent noise reduction is theoretically analyzed to evaluate its performance. The probability density function (PDF) of the output of the algorithm is derived and used to calculate the theoretical signaltonoise ratio (SNR) enhancement and the receiver operating characteristics. The performance limits of the algorithm are also established. Some experimental results of SNR enhancement obtained with the polarity thresholding algorithm are presented.
 Publication:

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control
 Pub Date:
 January 1989
 Bibcode:
 1989ITUFF..36..101S
 Keywords:

 Noise Reduction;
 Signal Detection;
 Signal To Noise Ratios;
 Spectrum Analysis;
 Ultrasonic Radiation;
 Bandwidth;
 Mathematical Models;
 Polarity;
 Probability Density Functions;
 Ultrasonic Flaw Detection;
 Communications and Radar