At any point in a frequency -shift facsimile system , the numerical difference between the frequency that corresponds to a white signal and the frequency that corresponds to a black signal . Note: Facsimile frequency shift is usually expressed in hertz . [ From Weik '89 ]
FACSIMILE FREQUENCY SHIFT
Meaning of FACSIMILE FREQUENCY SHIFT in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012