Which of the following equation defines Wiener filter in frequency domain (Sd and Sm represent the PSDs of desired signal and noise respectively)

W(ω)=Sd(ω)Sd(ω)+Sm(ω)

W(ω)=Sd(ω)+Sm(ω)Sm(ω)

W(ω)=Sd(ω)−Sm(ω)Sm(ω)

W(ω)=Sd(ω)Sd(ω)−Sm(ω)

Option b