1. High speed modems use adaptive equalizers to compensate for non-constant group delay . 2. The following proof illustrates this idea of minimum group delay . 3. Other writers suggest that a group delay ripple of a few percent is permissible. 4. The Bessel filter maximizes the flatness of the group delay curve at zero frequency. 5. The filter has a low-frequency group delay of 1 / \ omega _ 0. 6. A plot of the gain and group delay for a fourth-order low pass Bessel filter. 7. Equalizing filters must cancel out any group delay and phase delay between different frequency components. 8. For all causal and magnitude response, the minimum phase system has the minimum group delay . 9. Inserting the expressions for u and v and rearranging gives the following equation for group delay . 10. An example of a fourth order network, with 10 % group delay ripple is considered later.
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