In Section 17.7, it was stated that the interpolated signals will have the correct threshold crossings if and in Fig XXXXXXXXXXare linear in the region . In fact, this region is larger than what is...

In Section 17.7, it was stated that the interpolated signals will have the correct threshold crossings if and in Fig. 17.32 are linear in the region . In fact, this region is larger than what is actually necessary. What is the minimum region of that and should be linear over?