声频滤波器 sceptron ; note filter

超声波频率 Ultrasonic Frequency ; berschallwellenfrequenz ; Ultraschallwellenfrequenz

声中频检波器 sound intermediate-frequency detector

超声波频闪观测器 ultrasonic stroboscope

声波频谱测定法 acoustic spectrometry

声波频率测深 acoustic frequency sounding

声波频率响应校正 sonic frequency response correction ; Sency response correction

声频电流波形分析器 sonagraph

声频调制检波器 audio modulation detector

声频谐波失真 audio frequency harmonic distortion