A method of estimating a time differential between a plurality of signals comprising: determining a filter response of a first electrical signal with a first filter array; and determining a filter response of a second electrical signal with a second filter array; the first filter array comprising a first plurality of bandpass filters; and the second filter array comprising a second plurality of bandpass filters; characterized in that the method further comprises: amplifying the second electrical signal to generate an amplified electrical signal; determining a filter response of the amplified electrical signal with a third filter array; selecting either the filter response of the second electrical signal or the filter response of the amplified electrical signal, by passing a signal associated with a selected amplitude range, to determine a selected filter response; and sampling the filter response of the first electrical signal; sampling the selected filter response; calculating a first Fourier transform, wherein the first Fourier transform is a Fourier transform of the sampled filter response of the first electrical signal; calculating a second Fourier transform, wherein the second Fourier transform is a Fourier transform of the sampled selected filter response; and calculating a phase correction such that a correlation between the first Fourier transform and the second Fourier transform is maximized, wherein the calculated phase correction represents a time differential between the first electrical signal and the second electrical signal. determining a filter response of a first electrical signal with a first filter array; and determining a filter response of a second electrical signal with a second filter array; the first filter array comprising a first plurality of bandpass filters; and the second filter array comprising a second plurality of bandpass filters; characterized in that the method further comprises: amplifying the second electrical signal to generate an amplified electrical signal; determining a filter response of the amplified electrical signal with a third filter array; selecting either the filter response of the second electrical signal or the filter response of the amplified electrical signal, by passing a signal associated with a selected amplitude range, to determine a selected filter response; and sampling the filter response of the first electrical signal; sampling the selected filter response; calculating a first Fourier transform, wherein the first Fourier transform is a Fourier transform of the sampled filter response of the first electrical signal; calculating a second Fourier transform, wherein the second Fourier transform is a Fourier transform of the sampled selected filter response; and calculating a phase correction such that a correlation between the first Fourier transform and the second Fourier transform is maximized, wherein the calculated phase correction represents a time differential between the first electrical signal and the second electrical signal. amplifying the second electrical signal to generate an amplified electrical signal; determining a filter response of the amplified electrical signal with a third filter array; selecting either the filter response of the second electrical signal or the filter response of the amplified electrical signal, by passing a signal associated with a selected amplitude range, to determine a selected filter response; and sampling the filter response of the first electrical signal; sampling the selected filter response; calculating a first Fourier transform, wherein the first Fourier transform is a Fourier transform of the sampled filter response of the first electrical signal; calculating a second Fourier transform, wherein the second Fourier transform is a Fourier transform of the sampled selected filter response; and calculating a phase correction such that a correlation between the first Fourier transform and the second Fourier transform is maximized, wherein the calculated phase correction represents a time differential between the first electrical signal and the second electrical signal.