7.07  filter exact midband frequency. Geometric mean of the lower and upper band-edge frequencies, symbols f1 and f2, respectively, of a bandpass filter. Midband frequency, symbol fm, has a specified relationship to a reference frequency, fr, such that the ratio of the exact midband frequencies of any two contiguous bandpass filters of a specified fractional octave bandwidth is the same. When the denominator of the bandwidth designator, 1/b, is an odd number (e.g., 1/3 octave), exact midband frequencies of any filter in a set of filters are determined from

7.07 filter exact mindband frequency



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