The heterodyne interferometer manufactured by Polytec is able to output the sony/philips digital interface format （S/PDIF） digital signal with 24-bit precision， constant output delay and quantized sampling rate. The dynamic calibration of the digital accelerometer with conventional heterodyne interferometry has the problem that the processing data is large and the time cost or system cost increase. Use the field programmable gate array （FPGA） to decode the output S/PDIF digital signal of the Polytec heterodyne interferometer in real-time， and further accomplish the shaker dynamic calibration of the micro electromechanical systems （MEMS） digital accelerometer with other transmission protocols using the S/PDIF digital signal. Experimental results show that the investigated method effectively reduces the data processing amount of the calibration system and has higher calibration accuracy of sensitivity amplitude and phase.