The Nature of Electromagnetic Interference

Abstract

This report provides a brief tutorial on the underlying physical forces that lead to interference with hearing aids and assistive listening devices, as well as measurement issues and possible solutions to the problem.

Abbreviations: ALD = assistive listening device, EM = electromagnetic, TEM = transverse electromagnetic

Keywords

Assistive listening device - hearing aid - interference

• REFERENCES

• American National Standards Institute. (2001). American National Standard for Methods of Measurement for Hearing Aid Compatibility (HAC) with Wireless Communication Devices. (ANSI C63.19 2001). New York: ANSI.
• International Electrotechnical Commission. (1981). Methods of Measurement of Electroacoustical Characteristics of Hearing Aids—Part 4: Magnetic Field Strength in Audio-Frequency Induction Loops for Hearing Aid Purposes. (IEC 118–14).
• IEEE Recommended Practice for an Electromagnetic Site Survey (10 kHz to 10 GHz). IEEE Standard 473–1985.
• IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. IEEE Standard C95.1–1999.