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Develop a mobile app that exchange the sounds created by the city you live in with the sounds of your home city. Requires implementing a server for sound upload and categorization (to be done by the app automatically in the background, classification e.g. into "traffic", "market", etc.) and of a feature-based classification app that is able to understand the current sound environment and to replace it (over earphones) with cached sounds from the place that you chose on installing the app. An example: The app should help to make someone from Mumbai feel at home in Zurich. Requires good knowledge in audio signal processing.