digital and analog frequency

[ahmadaltaan]

I did not find a unified symbol for digital frequency and analog frequency in some books they denote to the digital frequency as Ω in the others ω, also the analog frequency. which one of them for digital and which one for analog?

 

[xulfee]

Ω is analog frequency and ω is digital frequency,we get ω by nornalizing Ω over sampling tine Ts

 

[FvM]

Ω is analog frequency and ω is digital frequency

It's used this way in some textbooks (e.g. Oppenheim Schafer) and different in others (e.g. Stearns). Beware of unfounded generalizations.