..., then the low-pass filter may not be needed. This filter, though, will decrease the noise input above the cutoff frequency and improve the system response. The second filter is a high-pass filter designed to limit the amplitude of the noise below 1/7 = 1, to eliminate the high-gain effects of double integration...

... or statistics can then be selectively discriminated from signal on the basis of frequency content. Through careful selection of the cutoff frequency, signals can be separated from noise which is relatively high in frequency content. When the filter's frequency is adjusted to the vertical characteristics...

..., to c44 at high frequencies, and to A at all frequencies. The pseudo-Rayleigh wave is affected by c44 near its cutoff frequency and by A at high frequencies. The flexural wave, which is generated by a shear wave logging tool, is similarly affected by c44 at low frequencies and by gamma at high frequencies...