Simulation of integrating zero crossing and quasisynchronous sample interpolation in Matlab environment

Simulation results of integrating zero crossing (IZC) and conventional zero crossing (CZC) with its modifications (including level zero crossing-LZC) obtained in the Matlab environment are given. The effects of different methods of numerical differentiation and integration as well as instrumental errors (including round-off and other dynamic errors) of sampling and hold (S&H) and A/D-conversion (ADC) devices are investigated. Simulation results of quasisynchronous sample interpolation (QSI), based on the IZC, and discrete or fast Fourier transform (conventional Fourier transform-CFT) also obtained in the Matlab environment are described. Leakage errors estimation of harmonics are especially investigated. General considerations concerning further application of above methods (IZC, QSI) in real-time are also discussed.