1. A method for determining emotional arousal of a subject by speech analysis, comprising the steps of: obtaining a speech sample; pre-processing the speech sample into silent and active speech segments and dividing the active speech segments into strings of equal length blocks; said blocks having primary speech parameters including pitch and amplitude parameters; deriving a plurality of selected secondary speech parameters indicative of characteristics of equal-pitch, rising-pitch and falling-pitch trends in said strings of blocks; comparing said secondary speech parameters with predefined, subject independent values representing non-emotional speech to generate a processing result indicative of emotional arousal, and outputting said generated processed result to an output device, wherein said secondary speech parameters comprise: (a) average length of short silences and number of short silences per unit of time; (b) average length of equal pitch segments and number of equal pitch segments per unit of time; (c) rising pitch segments length average and number of rising pitch segments per unit of time and falling pitch segments length average and number of falling pitch segments per unit of time; and (d) average amplitude dispersion within equal pitch segments of speech.
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.