Quasi-synchronous sampling and its application in the digital measurement of common electronical parameter

A new sampling method,namely quasi-synchronous sampling was proposed.The sampling period is not necessarily to be strictly synchronous to that of the signal.And it has a good effect to use quasisynchronous sampling in the digital measure of common electrical parameter having the same accuracy of the synchronous sampling method. The accuracy of the calculation is correspond to the accuracy of AD converter.The algorithm can get a high accuracy if the AD converter has a high accuracy.Usually,if the AD converter has 16 bits,the accuracy of the measurement in the engineering can reach 0.02 percent.The paper first introduces the theory of quasi-synchronous algorithm was introduced,the deduction was proposed of quasi-synchronous coefficient was discussed,and at last the realization of quasi-synchronous algorithm in DSP was proposed.