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在摄录像机和彩电等视频设备中,广泛采用了三端陶瓷陷波器(带阻吸收特性)、滤波器(带通选频特性)、鉴频器(移相鉴频特性),分别用于第二伴音中频的吸收、选频滤波和解调。三者的外形相似,在改频、改制及维修中,业余条件下只能以标号来识别。因厂家不同,型号繁杂,很多维修人员常将三者混用,特别是易将滤波器当鉴频器用,造成伴音失真、音轻或无声。
In video cameras and TV and other video equipment, widely used three-terminal ceramic notch filter (with resistance absorption characteristics), filter (band pass frequency characteristics), frequency discriminator (phase-frequency discrimination characteristics), respectively, for The second audio frequency absorption, frequency filtering and demodulation. Three similar shape, in the frequency conversion, restructuring and maintenance, amateur conditions can only be identified by label. Due to different manufacturers, the model is complicated, many maintenance staff often mix the three, especially easy to filter as frequency detector, resulting in sound distortion, light or silent.