Talaq Clarification

(1) What is the minimum level of voice required for Talaq to be effective? (2) Sometime, in our day-to-day life, out of anger or anxiety or some other reason, we express our wish or desire to do or say certain things. Example, � I should eat such and such food today�, �I should go and say such and such thing to such and such person clearly� etc etc. Here, we are NOT actually doing the thing but merely thinking about doing it. We later on, may or may not do that thing. In a similar manner, if a husband says Talak, Talak, Talak, while imagining his wife and thinking that �HE SHOULD� give Talak to his wife, does the Talak happen? He did not ACTUALLY MEANT GIVING TALAK, he was merely thinking (comprehending) about it that this is what he should do.