15. The method according to claim 13 , wherein said voice input unit of the apparatus includes at least one element selected from the group consisting of: a microphone, an interface to an audio player, an interface to a wired, wireless or cellular telephone, an interface to the Internet or other network, an interface to a computer, an interface to an electronic personal organizer or to any other electronic equipment, and an interface to a toy.
13. The method according to claim 1 , wherein: said obtaining step is carried out using a voice input unit; said preprocessing is carried out using a pre-processing unit for pre-processing voice samples from voice input unit; said deriving and comparing steps are carried out using a main processing unit for processing said pre-processed voice samples and detecting emotional arousal therefrom; and said processing result is outputted to a main indicators output unit for outputting an indication of emotional arousal.