Abstract: It has the increasingly high requirements in quality of audio signal of digital high-definition (HD) equipment, along with the widespread and popular digital HD equipment. Currently, the signal analysis of audio transmission quality of digital HD transmission interface is usually only used in the physical layer, can not from the users’ perspective. The nonlinear audio signal to digital HD equipment has been tested from the point of view of system in this paper. The innovation which include the test module framework and the transmission quality algorithm of nonlinear audio signal is proposed in this paper, and is validatedit by testing HD6M48 device of chuangnengda and 29D08HT devices of Shenzhen SKYWORTH. By the results of quantitative analysis, the testing results are in accord with the actual use, and it improves the testing efficiency and simplicity.

Key words:  digital HD equipment, audio signal, nonlinear signal, error analysis