In angle modulation , the ratio of the frequency deviation of the modulated signal to the frequency of a sinusoidal modulating signal. ( 188 ) Note: The modulation index is numerically equal to the phase deviation in radians.
MODULATION INDEX
Meaning of MODULATION INDEX in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012