Audio testing technology research

Radio and television industry of China has an extremely rapid development, with the equipment digitization increasing constantly, an effective analysis on audio indicators of new equipments digitized becomes a problem radio and television testers facing. The author introduces the key technical indicators of analog audio and digital audio, as well as the importance of relevant indicators, whilst proposes how to use the AP2722 audio analyzer to test the related indicators. In terms of the analog audio testing, the author focuses on the testing method of output impedance and input impedance. The impedance calculated by this testing method has a high precision, and can meet the testing requirements of current radio and television industries, whilst makes up a shortage that measurement instruments can't test the impedance. In terms of the digital audio testing, the author focuses on the measurement of jitter and digital audio format, whilst proposes a method of how to avoid losing the digital audio signal information, finally, gives a few of measurement results.