How implement a delegation pattern in c# using delegates?

I want to implement delegation pattern using delegates

public class Cat {
    private delegate void SoundDelegate();
    private SoundDelegate sound;
    public Cat() {
        sound = new SoundDelegate(SomeClass.DoSound1);
    }
    public void DoSound() {
        sound();
    }
}
public class PussyCat {
    private delegate void SoundDelegate();
    private SoundDelegate sound;
    public PussyCat() {
        sound = new SoundDelegate(SomeClass.DoSound2);
    }
    public void DoSound() {
        sound();
    }
}
public class SomeClass {
    public static void DoSound1() {
        Console.WriteLine("Sound 1");
    }
    public static void DoSound2() {
        Console.WriteLine("Sound 2");
    }
}

Does this code impelement the delegation pattern? I mean can I use delegates for implement delegation pattern or this way is incorrect.

And if the previous example is correct and I can use delegates to implement the delegation pattern and implement the observer pattern, then what is the difference between the observer pattern and the delegation pattern and what is similar?