音频发生器: acoustic frequency generatoraudio frequency generatoraudio generatortone frequency generatortone generatorvfb voice frequency generatorvfg voice frequency generatorvoice frequency generato
In - line filter for use with voiceband terminal equipment operating on the same wire pair with high frequency up to 10 mhz devices 与高频最高10 mhz装置相同对绞线上运行的音频终端设备用嵌入式虑波器