Link between cross-Wigner distribution and cross-Teager energy operator

The cross-Teager-Kaiser energy operator for complex-valued signals is defined and a new operator called Psi(B) is introduced. The relationship between the cross-Wigner-Ville distribution and the operator Psi(B) is established. This link results in a simple way to estimate the second conditional moment via the Wigner-Ville distribution. Some important properties of Psi(B), are also presented.