What are the domestic and international EMC (electromagnetic compatibility) standards for hearing screening devices?

Hearing screening devices (e.g., otoacoustic emissions (OAE) and automated auditory brainstem response (AABR)) must comply with GB 9706.1, YY 0505 (domestic), and IEC 60601-1-2 (international) EMC standards. OAE uses a miniature speaker to emit sound and detect the weak acoustic emissions produced by the cochlea; AABR uses headphones to deliver sound and record scalp EEG signals. Both involve the acquisition of extremely weak signals. The standards require highly stable generation of stimulus signals and detection of weak response signals, as well as extremely strong resistance to environmental electromagnetic noise (especially power frequency and its harmonics) to ensure the accuracy of screening results and avoid misjudgments.