Большой англо-русский и русско-английский словарь
frequency-(ex) change [frequency-shifted] signaling, multifrequency signaling
Англо-русский словарь технических терминов
frequency-(ex)change [frequency-shifted\] signaling, multifrequency signaling
Русско-английский политехнический словарь
frequency-(ex)change [frequency-shifted] signaling, multifrequency signaling