The filter section uses switched capacitor techniques for high-and low-group filters and dial-tone rejection.
在滤波部分，高组滤波和拨号音频滤波等使用了开关电容技术。
The filter section (12) and the frame are formed of a nonwoven polymer material, preferably a polyester material.
所述过滤区段（12）和所述框架由非纺织聚合物材料形成，并优选由聚酯材料形成。
A filter pack (10) is formed of a pleated filter section (12) and a top edge band (14) and a bottom edge band (16) that form a frame.
一种过滤包(10)，其由折叠过滤区段(12)、顶部边缘条带(14)和底部边缘条带(16)形成，所述顶部边缘条带(14)和所述底部边缘条带(16)形成一框架。
A filter pack (10) is formed of a pleated filter section (12) and a top edge band (14) and a bottom edge band (16) that form a frame.
一种过滤包(10)，其由折叠过滤区段(12)、顶部边缘条带(14)和底部边缘条带(16)形成，所述顶部边缘条带(14)和所述底部边缘条带(16)形成一框架。
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