办事指南

We're not jamming

点击量:   时间:2019-03-06 10:17:05

By Anil Ananthaswamy IT CAN be dangerous to jam cellphones to stop people using them—as the jamming signal can spill into the street and prevent people making emergency calls. But concert halls and restaurants could be free from ringing cellphones if manufacturers take up a new technology called Q-Zone, which keeps phones quiet without jamming. Small antennas in a venue transmit “quiet please” signals to cellphones entering the Q-Zone. Depending on what the user has programmed the phone to do, it automatically turns off or quietens its ring tone—or vibrates. Developed by BlueLinx of Charlotte, North Carolina,