Compared with other spectra analysis, such as Fourier entropy and periodic picture, this method has many advantages such as no limit to samplinglength and higher resolution to the spectra.
If samplinglength doesn't adapt rotative velocity, the results of calculation by FFT or periodogram analysis will lead to pseudo-periods, which distorts the principal value function terms.
若采样长度与回转速度不吻合，将会出现伪周期，使主值函数项中提取周期成分后的信号失实。
3
In DB2 9, any data row that is equal to or less than the database manager minimum record length is not used in the sampling when building the dictionary, and is not compressed during row compression.