调频音频电报
FMVFT Frequency Modulated Voice Frequency Telegraph
frequency VFT
modulation
多路音频电报
multi-cahnnel voice frequency
Telegraphy
多路音频电报制
multi-channel vioce frequency telegraphy
多路音频数据接入板
Multi-channel Voice Data Access Card
声频放大器音频放大器
audio-frequency amplifier
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