Predicting the Adoption of Broadcasting Innovations by Relating Technical Attributes to User Needs: Implications for System Designs

A variety of rather imaginative uses of conventional radio and television broadcast signals have been developed. These applications enrich the efficiency of spectrum utilization while increasing the diversity and nature of the types of services the broadcasting industry offers to home and business users. For example, several vertical blanking interval lines in NTSC broadcast television signals can be modulated to provide an electronic text and graphics service; unused portions of FM radio signals can be used to provide a subsidiary communications service; or broadcast television stations can transmit scrambled subscription programming to home video tape recorders during the "dark hours" of the broadcast day from 2:00 to 6:00 a.m.