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滤波器Q值

Q值是滤波器的品质因数,定义为中心频率除以滤波器带宽,如常规的31段均衡器,有100HZ、125HZ和160HZ几个频点,中心频率为125HZ,125HZ这个滤波器的Q值就为:125/(160-100)=2.08,Q值越小影响的可调带宽就越大,图示均衡器每个滤波器的Q值是固定的

 

Q factor[edit]

A band-pass filter can be characterised by its Q factor. The Q-factor is the inverse of the fractional bandwidth. A high-Q filter will have a narrow passband and a low-Q filter will have a wide passband. These are respectively referred to as narrow-band and wide-band filters.

 

https://en.wikipedia.org/wiki/Band-pass_filter

posted @ 2015-08-20 10:33  WELEN  阅读(4573)  评论(0编辑  收藏  举报