METHOD AND APPARATUS FOR TRANSMISSION RESTRICTION OF PORTABLE RADIO DEVICES

摘要

Many types of electronic equipment emit radio frequency signals. There are environments where the transmission of radio signals may be hazardous, unwelcome or should be restricted in a particular way. These environments include schools, hospitals, theatres, cinemas, conference centres and offices. The presence of such electronic equipment (1, 5) is detected and a controlling device (4, 5, 6, 16, 21) instructs the equipment to suppress radio transmission.