The woman does have an English rather than American accent. I'm from England originally and the effect was quite dramatic the first time I listened to it: meaningless noise, then speech, then completely intelligible speech (the repeat of the original meaningless noise). The second time I listened to it some time later (after reading your comment) I could understand the speech in the first sound but it was clearer in the second. Listening to it again shortly afterwards the first and last sound both sounded like speech and sounded much the same as each other. I wonder whether the accent is a factor?