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Elderly people who live alone can be monitored by new technology that analyses household sounds to ensure their safety.The new sound monitoring system, developed by Fujitsu, the Japanese electronics company, examines noises in homes via a microphone connected to a data centre. The technology is refined enough to differentiate between the sound of a falling object or a collapsing human and can instantly alert family members or security firms if any abnormality is detected.From breathing and coughing to sleeping, all noises made by the resident can be detected by the technology, in addition to analysis of daily routines, heat and humidity levels.