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Keywords: Bandwidth 2.svg centre frequency f<sub>H</sub> is the higher cut-off frequency and f<sub>L</sub> is the lower cut-off frequency The 0 dB level is the level of the peak of the bandpass response which is not necessarily located at the centre frequency Also the centre frequency is located at either the arithmetic or geometric mean of the upper and lower cut-offs depending on context and conventions Own Inductiveload 2008-10-19 Based on this image Bandpass filters |