VFC Voice Frequency Cable  音频电缆

VFC Voice Frequency Channel  音频信道

AM voice frequency carrier telegraph systme  调幅音频载波电报系统

VFCT Voice Frequency Carrier Telegraph  影片载波电报

VFCT Voice Frequency Carrier Terminal  音频载波终端

VFT Voice Frequency carrier telegraph Terminal  音频载波电报终端

Voice Frequency carrier  音频载波

voice-frequency carrier telegraph  音频载波电报

voice-frequency carrier telegraph equipment  音频载波电报设备

voice-frequency carrier telegraph terminal  音频载波电报终端机

voice-frequency carrier telegraphy  音频载波电报术

VFC Video Frequency Carrier  视频载波

double Voice frequency signal  双音频信号

FMVFT Frequency Modulated Voice Frequency Telegraph  调频音频电报

FSVFT Frequency Shift Voice Frequency Telegraph  移频音频电报

VF Voice Frequency  声频; 话频

VFA Voice Frequency Amplifier  音频放大器

VFB Voice Frequency Generator  音频发生器

VFD Voice Frequency Dialing  音频拨号