An increasing number of intelligent systems ranging from smartphones, info entertainment systems for vehicles, tablet and smartphone applications, to household devices and building services technology, are controlled via voice input.
However, many of the voice control systems are very error-prone. The human factor has often been disregarded during programming. Human beings do not always apply the same logic; they express themselves differently according to their language skills, nationality, social environment and educational background. As soon as the command entered does not comply with the envisaged and programmed command of the system due to the selection of words, sequence of words or pronunciation, the user is not understood and the command is not carried out. Break-offs and renewed speech input are time-consuming for the user and in some situations distracting and dangerous, for example while driving.
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