Other sources of interharmonics are cycloconverters, arc furnaces,
and other loads that do not operate synchronously with the power-line
frequency [1.41].
High-frequency components can interfere with other electronic systems
nearby and also contribute to radiated electromagnetic interference
(EMI). Medical electronics is particularly susceptible to the effects
of EMI due to the low-level signals involved. Telephone transmission can
be disrupted by EMI-induced noise.
This recent emphasis on the purity of delivered power has resulted
in a new field of study—that of “power quality.”