Systems, methods, and devices for enforcing do not disturb functionality on mobile devices
摘要
說明書
In another implementation, the mobile device holder may be an off-the-shelf conventional device cradle, but having an antenna or antenna sandwich affixed to the back side of the cradle. In this implementation, the difference in signal strength (SNR) between the cradle antenna and other antennas in the vehicle will be lower than in the scenario of a custom mobile device holder, but will still be sufficient to determine if the mobile device is in its holder.
When there is an allowed mobile device in the vehicle, placed in its holder or cradle, it may still be desirable for the system to detect the presence of other mobile devices in the driver's area of the vehicle. The system must subtract out the signal from the allowed mobile device. In one implementation, the system determines on which band the allowed mobile device is operating, and ignores that band at all antennas when looking for additional mobile devices. Most mobile devices will use different uplink bands depending on the activity (mobile device call versus data transmission, for example). Therefore, the “band white-listing” must be used in conjunction with a time component, monitoring how the emissions from the allowed mobile device change over time, and modifying which band is white-listed. In one implementation of band white-listing, a hardware notch filter is preferably used. The system may switch between several notch filters—depending on the active frequency of the allowed mobile device. These notch filters may be implemented via standard hardware or software techniques. In another implementation, where multiple bandpass filters are used, one for each uplink band, the output of the bandpass for the active band of the allowed mobile device may simply be attenuated.
