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How soundproof are the modern windows?

Our house has had a lot of problems with the windows since we moved in. They are triple-glazed aluminum windows. It always amazes me how soundproof it is. For example, when I woke up this morning, I heard birds chirping. There's nothing wrong with that, but I'm surprised when the window is closed and there's no tree in front of it. Or I'm standing on the 1st floor at the window (closed) and I hear the neighbors in the next garden (a house with a terrace, so not that far away) talking (they're not screaming). Is this normal and am I just expecting too much?

• window soundproof
• windows