2022/05/08، 02:06 AM
Like backscatter X-ray machines, millimeter wave scanners produce detailed full-body images of passengers, but they do it with ultrahigh-frequency millimeter wave radiation rather than X-rays. If you went on name alone, you might think "advanced imaging technology machines" could help doctors hunt for tumors or other medical conditions. In reality, the label -- euphemism, if you're cynical -- adopted by the U.S. Transportation Security Administration (TSA) describes the whole-body scanners found at airports that detect weapons, explosives or other threats being carried on passengers. According to the TSA's Web site, the agency had installed 800 advanced imaging technology machines at 200 U.S. November 2012. The machines come in two flavors, based on the type of electromagnetic radiation they use to make a scan. Backscatter machines -- about 30 percent of the installations -- send low-energy X-rays to bounce off a passenger's body. Millimeter wave (mmw) scanners emit energy more akin to microwaves. Both see through clothing to produce a 3-D image of the person standing in the machine. It's 2 a.m. at the dance club and the disc jockey starts spinning the latest hit song from Rihanna. Everybody packs the dance floor. Grooves to the infectious beat. When the song reaches the chorus, something unexpected happens. Rihanna's voice is replaced with Stevie Wonder singing "Superstition." It's the same beat and bass line of the Rihanna song, but with Stevie Wonder dropped seamlessly on top. As the song continues, the Rihanna backbeat is replaced with the deep thud-thud of house music. With something called music mixing software. Music mixing software allows musicians to slice and dice digital music and reassemble it in new, creative ways. The software can match tempos between two songs without distorting the pitch of either one. It can chop a track into dozens of loops. Shuffle them to achieve a totally new sound. It can add stunning effects that completely change the emotional tone of the music. Music mixing software is a powerful tool for DJs and music producers. noticias internacionales
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