调频音频电报
FMVFT Frequency Modulated Voice Frequency Telegraph
modulation
frequency VFT
计算机音频技术
computer audio technology
离散多音频技术
Discrete Multi-tone Technology
视频音频采集
video and audio data collection
视频音频集成操作
VAIO Video Audio Integrated Operation
移频音频电报
FSVFT Frequency Shift Voice Frequency Telegraph