I've written this so many times as it's a question that reoccurs regularly.
I once met a speech therapist who was married to one of our community. She said the worst thing CD'ers can do is try to talk like a BeeGee, overly falsetto. Instead start with your natural singing voice and work your way up the scale, Do, Ray, Mi. Go no higher, in fact Ray will suit most. Raising your pitch just a small amount is all that's needed but then you need to speak softer and with more focus on inflection. Also women tend to speak in longer sentences.
If asked the time a man will say "12-30. A woman,"Oh let me look, oh my is that the time, 12-30 already". It's as much about what you say, how you say it as the actual voice you use.
