In order to reduce synchronous-sampling error,the algorithm of Cosin-window and interpolated FFT and soft synchronous sampling with linear interpolation are studied and simulated.

It can't avoid that the problem of transforming a continue signal into a discrete digital series in the process of design a digitalized signal sampling system,so it is importance to discuss the sampling error for Hi－Fi digital sampling system.

The Gauss width of focal spot which is too small results in the sampling error while using CCD as the centroid detecting device of Shack-Hartmann Wavefront Sensor(SHWS) in Adaptive Optics(AO) system.

Principle and application of simultaneous sampling A/D converter AD7262

Some new technologies such as chopper-stabilized amplifier, simultaneous sampling A/D converter and universal serial bus (USB) will be well used in this system, which grant a higher veracity, lower noise and more flexible way in data communication.

It expounded how to use the advantage of Fast Fourier Transform Algorithm (FFT) in DSP, how to carry out Simultaneous Sampling for voltage and current of generator′s stator with ADS8364, how to get accurate PWM output by using PID and LOEC.

A time-domain fault location algorithm using synchronized sampling at two ends;

By using the synchronized sampling technique, the analog AC signals from the traditional voltage transformer and current transformer are constructed into a sampled value mapping in conformity with IEC 60044-7, IEC 60044-8 and IEC 61850-9-1 standards, directly laying the IEC 61850 data basis for traditional substations.

The first is forward acquisition circuit made up of Hall sensor and serial ADC,the second is data processing circuit made up of digital signal processor(DSP),and the third is hardware synchronized sampling circuit made up of CPLD and PLL;finally,the software arithmetic is principally made up of FFT.