When searching special area information, it fuses sample documents, extracts common keywords, and adjusts the sample documents to control the search space and result sum.

A pitch tracking algorithm was developed based on the normalized sum of the magnitude difference square function (SMDSF) for accurately estimating speech pitch at any sample rate in real time.

Using simulation result as a substitute for data of test sampling, obtains the relation between sample size and sum of buildings, and it would be helpful to calculation of sample size.