You're probably already aware of the United Kingdom's large network of video cameras inspecting public places. News.com now reports that they'll be listening for trouble as well. Based on a model in use in the Netherlands, new cameras will be fitted to 'listen for aggressive tones,' such as those used during an argument. From the article: "The system works by putting microphones in CCTV cameras to continually analyze the sound in the surrounding area. If aggressive tones are picked up, an alarm signal is automatically sent to the police, who can zoom in the camera to the location of the suspect sound and investigate the situation. 'Ninety percent of violent cases start with verbal aggression,' Van der Vorst said. 'With our system, the police can respond a lot quicker to a violent situation.'"