In the discussion on FM threshold effect presented in Section 2

In the discussion on FM threshold effect presented in Section 2.13, we describe the condition for the positive-going and negative-going clicks in terms of the envelope r (t) and phase ? (t) of the narrow band noise n (t). Reformulate these conditions in term of the in phase components n1 (t) and quadrature components nQ (t) of n (t).