可变视频衰减器
variable video attenuator
中频衰减器
intermediate frequency attenuator
超声衰减测量
Ultrasonic attenuated measuring
超声衰减测量仪
ultrasonic attenuation measuring device
超声衰减的强度
intensity of ultrasonic damping
超声衰减谱
ultrasonic attenuation spectrum
超声衰减系数
ultrasonic attenuation coefficient
超声衰减性能
ultrasonic attenuation capacity
传声器声压灵敏度
pressure sensitivity of microphone
传声器声压频率响应
pressure frequency response of microphone
调制解调器声频回路控制
modem audio loopback control