A method and system provide for run-time modification of synthesized speech. The method includes the step (40) of generating synthesized speech based on textual input (16) and a plurality of run-time control parameter values (42). Real-time data (44) is generated based on an input signal (46), where the input signal characterizes an intelligibility of the speech with regard to a listener. The method further provides for modifying (48) one or more of the run-time control parameter values based on the real-time data (20) such that the intelligibility of the speech increases. Modifying the parameter values at run-time as opposed to during the design stages provides a level of adaptation unachievable through conventional approaches.
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